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Zhou J, Li M, Han X, Wang B, Zhang C, Cheng Z, Shen Z, Ogugua PC, Zhou C, Pan X, Yang F, Yuan T. Environmental sustainability practice of sewage sludge and low-rank coal co-pyrolysis: A comparative life cycle assessment study. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 928:172255. [PMID: 38599412 DOI: 10.1016/j.scitotenv.2024.172255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2024] [Revised: 03/28/2024] [Accepted: 03/28/2024] [Indexed: 04/12/2024]
Abstract
This study attempts to bridge the current research gaps related to the environmental burdens of low-rank coal (LRC) and sewage sludge (SS) co-pyrolysis potentially. The life cycle assessment (LCA), energy recovery and sensitivity analysis were investigated for different proportions of LRC and SS (co-)pyrolysis. The results showed that the LRC/SS pyrolysis mitigated the environmental burden with an average improvement of 43 % across 18 impact categories compared with SS pyrolysis. The best net values of energy and carbon credits were identified in SL-4 with -3.36 kWh/kg biochar and -1.10 CO2-eq/kg biochar, respectively. This study firstly proposed an optimal LRC/SS co-feed proportion at 3 to 7, which achieves the acceptable environmental burden and satisfactory energy recovery. Moreover, sensitivity analysis demonstrated this proportion is robust and adaptable. LRC/SS co-pyrolysis is a promising and sustainable alternative for SS disposal, which could meet the imperative of carbon emission mitigation and resource recycling.
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Affiliation(s)
- Jinyang Zhou
- State Environmental Protection Key Laboratory of Environmental Health Impact Assessment of Emerging Contaminants, School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
| | - Mingyue Li
- State Environmental Protection Key Laboratory of Environmental Health Impact Assessment of Emerging Contaminants, School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
| | - Xue Han
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China.
| | - Beili Wang
- State Environmental Protection Key Laboratory of Environmental Health Impact Assessment of Emerging Contaminants, School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
| | - Chen Zhang
- State Environmental Protection Key Laboratory of Environmental Health Impact Assessment of Emerging Contaminants, School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
| | - Zhiwen Cheng
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology, 100 Haiquan Road, Shanghai 201418, China.
| | - Zhemin Shen
- State Environmental Protection Key Laboratory of Environmental Health Impact Assessment of Emerging Contaminants, School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
| | - Paul Chinonso Ogugua
- School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
| | - Chao Zhou
- Wuhuan Engineering Co. Ltd., Wuhan 430223, China.
| | - Xiaolei Pan
- State Environmental Protection Key Laboratory of Environmental Health Impact Assessment of Emerging Contaminants, School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
| | - Fan Yang
- State Environmental Protection Key Laboratory of Environmental Health Impact Assessment of Emerging Contaminants, School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
| | - Tao Yuan
- State Environmental Protection Key Laboratory of Environmental Health Impact Assessment of Emerging Contaminants, School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
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2
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Yan X, Zhao S, Hu J, Dang J, Yao S, Cai J, Sittijunda S, Wang W, Lee DJ, Yang P. Absorbing oxygen carriers promotes phosphorus recovery from sludge via the microwave thermal conversion process. BIORESOURCE TECHNOLOGY 2024; 401:130760. [PMID: 38692376 DOI: 10.1016/j.biortech.2024.130760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Revised: 04/28/2024] [Accepted: 04/28/2024] [Indexed: 05/03/2024]
Abstract
This study aims to apply the Absorbing oxygen carriers (AOCs) to induce the migration and transformation of phosphorus compounds during the microwave thermal conversion of sludge so the hard-to-extract organic phosphorus (OP) can be converted to easy-to-extract inorganic phosphorus (IP) and be enriched onto the sludge char. The AOCs were recycled by screen separation from the IP-rich sludge char, with the latter being a renewable phosphorus source from sludge. The AOCs in this novel process enhanced the conversion efficiency of OP into non-apatite inorganic phosphorus (NAlP), which was further converted to apatite inorganic phosphorus (AP). Most phosphorus in the sludge char is presented in the form of orthophosphate.
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Affiliation(s)
- Xiaoyu Yan
- College of Mechanical & Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China
| | - Shuheng Zhao
- College of Mechanical & Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China; Collaborative Innovation Center of Biomass Energy, Henan Province, Zhengzhou 450002, China
| | - Jianjun Hu
- College of Mechanical & Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China; Collaborative Innovation Center of Biomass Energy, Henan Province, Zhengzhou 450002, China.
| | - Jiatao Dang
- College of Mechanical & Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China; Collaborative Innovation Center of Biomass Energy, Henan Province, Zhengzhou 450002, China
| | - Sen Yao
- College of Mechanical & Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China; Collaborative Innovation Center of Biomass Energy, Henan Province, Zhengzhou 450002, China
| | - Junmeng Cai
- Biomass Energy Engineering Research Center, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Sureewan Sittijunda
- Faculty of Environment and Resource Studies, Mahidol University, Nakhon Pathom 73170, Thailand
| | - Wei Wang
- College of Mechanical & Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China; Collaborative Innovation Center of Biomass Energy, Henan Province, Zhengzhou 450002, China
| | - Duu-Jong Lee
- Collaborative Innovation Center of Biomass Energy, Henan Province, Zhengzhou 450002, China; Department of Mechanical Engineering, City University of Hong Kong, Kowloon Tong, Hong Kong, China.
| | - Panbo Yang
- College of Mechanical & Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China
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Zhang X, Chen X, Xiao J, Peng X, Wang J, Ma J, Liu D, Liang C. Comparative study of different sewage sludge incineration treatments based on environmental and economic life cycle assessment. WASTE MANAGEMENT & RESEARCH : THE JOURNAL OF THE INTERNATIONAL SOLID WASTES AND PUBLIC CLEANSING ASSOCIATION, ISWA 2024; 42:418-429. [PMID: 37519287 DOI: 10.1177/0734242x231187560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/01/2023]
Abstract
Incineration is one of the most widely used treatments in the field of sewage sludge disposal. However, the choice of sewage sludge incineration process is still controversial. In this study, the comparative life cycle assessment of sewage sludge incineration processes, including the mono-incineration, co-incineration in coal-fired power plants and co-incineration in municipal solid waste (MSW) incineration plants, was carried out from the perspective of environment, carbon footprint and economy. The environmental assessment results show that terrestrial ecotoxicity, freshwater ecotoxicity, marine ecotoxicity, human carcinogenic toxicity and human non-carcinogenic toxicity are the most significant environmental impacts. And the environmental performance of co-incineration in coal-fired power plants is the best. Moreover, the environmental impact is most sensitive to the dehydrant, electricity and fly ash chelating agent. Co-incineration in MSW incineration plants has the lowest carbon emissions, with only 70.50% and 82% of the carbon emissions from mono-incineration and co-incineration in coal-fired power plants, respectively. Furthermore, sewage sludge mono-incineration has the highest disposal costs because of the higher depreciation and solid waste disposal costs. The comprehensive evaluation results reveal that the optimization should focus on the selection of dehydrant and fly ash chelating agent, as well as the improvement of the equipment efficiency.
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Affiliation(s)
- Xiaoyong Zhang
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, P.R. China
| | - Xiaoping Chen
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, P.R. China
| | - Jun Xiao
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, P.R. China
| | - Xiaowei Peng
- Shenzhen Energy Environment Co., Ltd., Shenzhen, P.R. China
| | - Jianguo Wang
- Changzhou Xi Lian Environmental Technology Co., Ltd., Changzhou, P.R. China
| | - Jiliang Ma
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, P.R. China
| | - Daoyin Liu
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, P.R. China
| | - Cai Liang
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, P.R. China
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Sun L, Li M, Liu B, Li R, Deng H, Zhu X, Zhu X, Tsang DCW. Machine learning for municipal sludge recycling by thermochemical conversion towards sustainability. BIORESOURCE TECHNOLOGY 2024; 394:130254. [PMID: 38151207 DOI: 10.1016/j.biortech.2023.130254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 12/09/2023] [Accepted: 12/23/2023] [Indexed: 12/29/2023]
Abstract
The sustainable disposal of high-moisture municipal sludge (MS) has received increasing attention. Thermochemical conversion technologies can be used to recycle MS into liquid/gas bio-fuel and value-added solid products. In this review, we compared energy recovery potential of common thermochemical technologies (i.e., incineration, pyrolysis, hydrothermal conversion) for MS disposal via statistical methods, which indicated that hydrothermal conversion had a great potential in achieving energy recovery from MS. The application of machine learning (ML) in MS recycling was discussed to decipher complex relationships among MS components, process parameters and physicochemical reactions. Comprehensive ML models should be developed considering successive reaction processes of thermochemical conversion in future studies. Furthermore, challenges and prospects were proposed to improve effectiveness of ML for energizing thermochemical conversion of MS regarding data collection and preprocessing, model optimization and interpretability. This review sheds light on mechanism exploration of MS thermochemical recycling by ML, and provide practical guidance for MS recycling.
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Affiliation(s)
- Lianpeng Sun
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China
| | - Mingxuan Li
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
| | - Bingyou Liu
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
| | - Ruohong Li
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China
| | - Huanzhong Deng
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
| | - Xiefei Zhu
- School of Advanced Energy, Sun Yat-sen University, Shenzhen 518107, China
| | - Xinzhe Zhu
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China.
| | - Daniel C W Tsang
- Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
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He J, Cui X, Chu Z, Jiang Z, Pang H, Xin X, Duan S, Zhong Y. Effect of zero-valent iron (ZVI) and biogas slurry reflux on methane production by anaerobic digestion of waste activated sludge. WATER ENVIRONMENT RESEARCH : A RESEARCH PUBLICATION OF THE WATER ENVIRONMENT FEDERATION 2024; 96:e10994. [PMID: 38351362 DOI: 10.1002/wer.10994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2023] [Revised: 01/19/2024] [Accepted: 01/25/2024] [Indexed: 02/16/2024]
Abstract
This study aimed to improve anaerobic digestion (AD) efficiency through the addition of zero-valent iron (ZVI) and biogas slurry. This paper demonstrated that methane production was most effectively promoted at a biogas slurry reflux ratio of 60%. The introduction of ZVI into anaerobic systems does not enhance its bioavailability. However, both biogas slurry reflux and the combination of ZVI with biogas slurry reflux increase the relative abundance of microorganisms involved in the direct interspecific electron transfer (DIET) process. Among them, the dominant microorganisms Methanosaeta, Methanobacterium, Methanobrevibacter, and Methanolinea accounted for over 60% of the total methanogenic archaea. The Tax4Fun function prediction results indicate that biogas slurry reflux and the combination of ZVI with biogas slurry reflux can increase the content of key enzymes in the acetotrophic and hydrotrophic methanogenesis pathways, thereby strengthening these pathways. The corrosion of ZVI promotes hydrogen production, and the biogas slurry reflux provided additional alkaline and anaerobic microorganisms for the anaerobic system. Their synergistic effect promoted the growth of hydrotrophic methanogens and improved the activities of various enzymes in the hydrolysis and acidification phases, enhanced the system's buffer capacity, and prevented secondary environmental pollution. PRACTITIONER POINTS: Optimal methane production was achieved at a biogas slurry reflux ratio of 60%. Biogas slurry reflux in anaerobic digestion substantially reduced discharge. ZVI addition in combination with biogas slurry reflux facilitates the DIET process.
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Affiliation(s)
- Junguo He
- School of Civil Engineering, Guangzhou University, Guangzhou, China
| | - Xinxin Cui
- School of Civil Engineering, Guangzhou University, Guangzhou, China
| | - Zhaorui Chu
- School of Civil Engineering, Guangzhou University, Guangzhou, China
| | - Zhifeng Jiang
- School of Civil Engineering, Guangzhou University, Guangzhou, China
- Architectural Design and Research Institute of Guangdong Province, China
| | - Heliang Pang
- School of Environmental and Municipal Engineering, Xi 'an University of Architecture and Technology, Xi 'an, China
| | - Xiaodong Xin
- Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Dongguan, China
| | - Shengye Duan
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, China
| | - Yijie Zhong
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, China
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6
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Li W, Chen J, Pang L, Lu Y, Yang P. Dosage effect of micron zero-valent iron during thermophilic anaerobic digestion of waste activated sludge: Performance and functional community. ENVIRONMENTAL RESEARCH 2023; 237:116997. [PMID: 37634689 DOI: 10.1016/j.envres.2023.116997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 08/09/2023] [Accepted: 08/25/2023] [Indexed: 08/29/2023]
Abstract
This work examined the performance and microbial traits in a thermophilic anaerobic digestion (TAD) of waste activated sludge that was impacted by micron zero valent iron (mZVI). Results showed that methane production was promoted by 0.8, 11.9, and 12.0 times, respectively, when mZVI was at dosages of 25, 100, and 250 mg/g total solid (TS). Also, the consumption of volatile fatty acids was increased by mZVI at higher dosages (100 and 250 mg/g TS). Furthermore, 16S rRNA sequencing demonstrated that microbial community stabilized after day 18 regardless of the dosage of mZVI, and that different dosages of mZVI induced different shifts in the functional community of the archaea rather than the bacteria involved in TAD. As a result, mZVI at 100 mg/g TS could increase the relative abundance of archaeal genera Methanothermobacter the most, increasing by 22.8% at the end of TAD compared to CK. Besides, redundancy analysis revealed that the physicochemical properties explained 79.65% and 89.10% of the variations of bacterial and archaeal abundance, respectively. Also, the findings of the correlation analysis revealed that total dissolved iron, ferrous iron, pH, and ammonium nitrogen, may be the key divers of altering functional communities, particularly archaea. Moreover, mZVI at 100 and 250 mg/g TS boosted the metabolic pathways of environmental information processing (ABC transporters) in bacteria and carbon metabolism and methane metabolism for archaea, as well as relative abundances of enzymes and their activities involved in various methanogenic pathways. This study provides new perspectives on the application of mZVI in solid wastes treatments.
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Affiliation(s)
- Wenqian Li
- College of Architecture and Environment, Sichuan University, Chengdu, 610065, PR China
| | - Jianglin Chen
- College of Architecture and Environment, Sichuan University, Chengdu, 610065, PR China
| | - Lina Pang
- College of Architecture and Environment, Sichuan University, Chengdu, 610065, PR China.
| | - Yuanyuan Lu
- College of Architecture and Environment, Sichuan University, Chengdu, 610065, PR China
| | - Ping Yang
- College of Architecture and Environment, Sichuan University, Chengdu, 610065, PR China
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7
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Qiu C, Li J, Wang C, Liu N, Qi L, Wang D, Wang S, Sun L. Transformation and environmental risk of heavy metals in sewage sludge during the combined thermal hydrolysis, anaerobic digestion and heat drying treatment process. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:54234-54241. [PMID: 36872408 DOI: 10.1007/s11356-023-26200-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Accepted: 02/25/2023] [Indexed: 06/18/2023]
Abstract
The design of this study was to investigate the solid-aqueous migration and chemical speciation transformation of heavy metals (HMs) in the sewage sludge during the combined process of thermal hydrolysis, anaerobic digestion and heat-drying. The results showed that most of the HMs were still accumulated in the solid phase of various sludge samples after treatment. After thermal hydrolysis, the concentrations of Cr, Cu and Cd increased slightly. All the HMs measured after anaerobic digestion were concentrated obviously. While the concentrations of all HMs decreased slightly after heat-drying. The stability of HMs in the sludge samples was enhanced after treatment. The environmental risks of various HMs were also relieved in the final dried sludge samples.
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Affiliation(s)
- Chunsheng Qiu
- School of Environmental and Municipal Engineering, Tianjin Chengjian University, No. 26, Jinjing Road 26, Xiqing District, Tianjin, 300384, People's Republic of China.
- Tianjin Key Laboratory of Aqueous Science and Technology, Jinjing Road 26, Tianjin, 300384, China.
| | - Jiakang Li
- School of Environmental and Municipal Engineering, Tianjin Chengjian University, No. 26, Jinjing Road 26, Xiqing District, Tianjin, 300384, People's Republic of China
- Tianjin Key Laboratory of Aqueous Science and Technology, Jinjing Road 26, Tianjin, 300384, China
| | - Chenchen Wang
- School of Environmental and Municipal Engineering, Tianjin Chengjian University, No. 26, Jinjing Road 26, Xiqing District, Tianjin, 300384, People's Republic of China
- Tianjin Key Laboratory of Aqueous Science and Technology, Jinjing Road 26, Tianjin, 300384, China
| | - Nannan Liu
- School of Environmental and Municipal Engineering, Tianjin Chengjian University, No. 26, Jinjing Road 26, Xiqing District, Tianjin, 300384, People's Republic of China
- Tianjin Key Laboratory of Aqueous Science and Technology, Jinjing Road 26, Tianjin, 300384, China
| | - Li Qi
- School of Environmental and Municipal Engineering, Tianjin Chengjian University, No. 26, Jinjing Road 26, Xiqing District, Tianjin, 300384, People's Republic of China
- Tianjin Key Laboratory of Aqueous Science and Technology, Jinjing Road 26, Tianjin, 300384, China
| | - Dong Wang
- School of Environmental and Municipal Engineering, Tianjin Chengjian University, No. 26, Jinjing Road 26, Xiqing District, Tianjin, 300384, People's Republic of China
- Tianjin Key Laboratory of Aqueous Science and Technology, Jinjing Road 26, Tianjin, 300384, China
| | - Shaopo Wang
- School of Environmental and Municipal Engineering, Tianjin Chengjian University, No. 26, Jinjing Road 26, Xiqing District, Tianjin, 300384, People's Republic of China
- Tianjin Key Laboratory of Aqueous Science and Technology, Jinjing Road 26, Tianjin, 300384, China
| | - Liping Sun
- School of Environmental and Municipal Engineering, Tianjin Chengjian University, No. 26, Jinjing Road 26, Xiqing District, Tianjin, 300384, People's Republic of China
- Tianjin Key Laboratory of Aqueous Science and Technology, Jinjing Road 26, Tianjin, 300384, China
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Raza S, Ghasali E, Raza M, Chen C, Li B, Orooji Y, Lin H, Karaman C, Karimi Maleh H, Erk N. Advances in technology and utilization of natural resources for achieving carbon neutrality and a sustainable solution to neutral environment. ENVIRONMENTAL RESEARCH 2023; 220:115135. [PMID: 36566962 DOI: 10.1016/j.envres.2022.115135] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2022] [Revised: 11/19/2022] [Accepted: 12/19/2022] [Indexed: 06/17/2023]
Abstract
The greatest environmental issue of the twenty-first century is climate change. Human-caused greenhouse gas emissions are increasing the frequency of extreme weather. Carbon dioxide (CO2) accounts for 80% of human greenhouse gas emissions. However, CO2 emissions and global temperature have risen steadily from pre-industrial times. Emissions data are crucial for most carbon emission policymaking and goal-setting. Sustainable and carbon-neutral sources must be used to create green energy and fossil-based alternatives to reduce our reliance on fossil fuels. Near-real-time monitoring of carbon emissions is a critical national concern and cutting-edge science. This review article provides an overview of the many carbon accounting systems that are now in use and are based on an annual time frame. The primary emphasis of the study is on the recently created carbon emission and eliminating sources and technology, as well as the current application trends for carbon neutrality. We also propose a framework for the most advanced naturally available carbon neutral accounting sources capable of being implemented on a large scale. Forming relevant data and procedures will help the "carbon neutrality" plan decision-making process. The formation of pertinent data and methodologies will give robust database support to the decision-making process for the "carbon neutrality" plan for the globe. In conclusion, this article offers some opinions, opportunities, challenges and future perspectives related to carbon neutrality and carbon emission monitoring and eliminating resources and technologies.
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Affiliation(s)
- Saleem Raza
- College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua, 321004, Zhejiang, PR China; College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, PR China
| | - Ehsan Ghasali
- College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua, 321004, Zhejiang, PR China; College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, PR China
| | - Muslim Raza
- Department of Chemistry Bacha Khan University, Charsada, Khyber Pakhtunkhwa, Pakistan; Department of Chemistry, University of Massachusetts Boston, MA, 02125, USA
| | - Cheng Chen
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, PR China
| | - Bisheng Li
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, PR China
| | - Yasin Orooji
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, PR China; Research & Development Department, Shandong Advanced Materials Industry Association, Jinan 250200, Shandong, China.
| | - Hongjun Lin
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, PR China
| | - Ceren Karaman
- Department of Electricity and Energy, Vocational School of Technical Sciences, AkdenizUniversity, Antalya, 07070, Turkey; School of Engineering, Lebanese American University, Byblos, Lebanon.
| | - Hassan Karimi Maleh
- School of Resources and Environment, University of Electronic Science and Technology of China, 611731, Xiyuan Ave, Chengdu, PR China; Department of Chemical Engineering, Quchan University of Technology, Quchan, 9477177870, Iran; Department of Sustainable Engineering, Saveetha School of Engineering, SIMATS, Chennai, 602105, India.
| | - Nevin Erk
- Ankara University, Faculty of Pharmacy, Department of Analytical Chemistry, 06560, Ankara, Turkey
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Zhu X, Liu B, Sun L, Li R, Deng H, Zhu X, Tsang DCW. Machine learning-assisted exploration for carbon neutrality potential of municipal sludge recycling via hydrothermal carbonization. BIORESOURCE TECHNOLOGY 2023; 369:128454. [PMID: 36503096 DOI: 10.1016/j.biortech.2022.128454] [Citation(s) in RCA: 16] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 12/02/2022] [Accepted: 12/04/2022] [Indexed: 06/17/2023]
Abstract
In the context of advocating carbon neutrality, there are new requirements for sustainable management of municipal sludge (MS). Hydrothermal carbonization (HTC) is a promising technology to deal with high-moisture MS considering its low energy consumption (without drying pretreatment) and value-added products (i.e., hydrochar). This study applied machine learning (ML) methods to conduct a holistic assessment with higher heating value (HHV) of hydrochar, carbon recovery (CR), and energy recovery (ER) as model targets, yielding accurate prediction models with R2 of 0.983, 0.844 and 0.858, respectively. Furthermore, MS properties showed positive (e.g., carbon content, HHV) and negative (e.g., ash content, O/C, and N/C) influences on the hydrochar HHV. By comparison, HTC parameters play a critical role for CR (51.7%) and ER (52.5%) prediction. The primary sludge was an optimal HTC feedstock while anaerobic digestion sludge had the lowest potential. This study provided a comprehensive reference for sustainable MS treatment and industrial application.
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Affiliation(s)
- Xinzhe Zhu
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China
| | - Bingyou Liu
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
| | - Lianpeng Sun
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China.
| | - Ruohong Li
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China
| | - Huanzhong Deng
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
| | - Xiefei Zhu
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China; Department of Thermal Science and Energy Engineering, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China
| | - Daniel C W Tsang
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
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10
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You BC, Huang CC, Chuang SH. The characteristics of stepwise ultrasonic hydrolysates of sludge for enhancing denitrification. BIORESOURCE TECHNOLOGY 2023; 370:128566. [PMID: 36592866 DOI: 10.1016/j.biortech.2022.128566] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2022] [Revised: 12/27/2022] [Accepted: 12/29/2022] [Indexed: 06/17/2023]
Abstract
The disposal of waste activated sludge (WAS) accounts for approximately 60 % of wastewater treatment plant operating costs. In this study, according to the reaction time and water quality parameters, ultrasonic hydrolysis of WAS is divided into three stages, including floc-disintegration (0-25.2 kJ/g TS), cell-disruption (25.2-36 kJ/g TS), and cell-degradation (over 36 kJ/g TS). The results show that more than 70 % carbon distributes inside the cell, which also contains 63.8 % protein enhancing denitrification capacity. Moreover, cell-degradation hydrolysate has a higher proportion of readily biodegradable COD, indicating that intracellular organic matter is more capable of denitrification than extracellular. Therefore, the optimal ultrasonic operating range is Es = 36-72 kJ/g TS as carbon source, and obtain the hydrolysate with high ratio of soluble chemical oxygen demand to total nitrogen for denitrification. Furthermore, this study supports the comprehensive interpretation of ultrasonic hydrolyzed WAS and the characteristics of hydrolysate as carbon source for enhancing denitrification.
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Affiliation(s)
- Bo-Cheng You
- Graduate Institute of Environmental Engineering, National Central University, Taoyuan City 320317, Taiwan
| | - Cheng-Chung Huang
- Material and Chemical Research Laboratories, Industrial Technology Research Institute, Hsinchu 310401, Taiwan
| | - Shun-Hsing Chuang
- Graduate Institute of Environmental Engineering, National Central University, Taoyuan City 320317, Taiwan.
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Zhao W, You J, Yin S, He S, Feng L, Li J, Zhao Q, Wei L. Calcium peroxide and freezing co-pretreatment enhancing short-chain fatty acids production from waste activated sludge towards carbon-neutral sludge treatment. BIORESOURCE TECHNOLOGY 2023; 367:128273. [PMID: 36347477 DOI: 10.1016/j.biortech.2022.128273] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 10/29/2022] [Accepted: 11/01/2022] [Indexed: 06/16/2023]
Abstract
Short-chain fatty acids (SCFAs) recovery through anaerobic fermentation is a promising technology to achieve carbon-neutral in waste activated sludge (WAS) management. After 0.15 g CaO2/g volatile suspended solids (VSS) addition and three-cycle freezing co-pretreatments, the maximal SCFAs production of 438.5 mg COD/g VSS was achieved within 4 days fermentation, and more than 70 % of SCFAs was composed of acetate and propionate, which achieved a higher level than reported in previous studies. Mechanism explorations elucidated that co-pretreatment triggered sludge solubilization, promoting the release of biodegradable organics, providing more biodegradable substrates for SCFAs generation. Further microbial community analysis indicated that the abundances of hydrolytic microorganisms and acidogens were enriched, whereas methanogens were inhibited. Besides, environmental analysis suggested that co-pretreatment could achieve carbon reduction benefits of 0.116-0.291 ton CO2/ton WAS, demonstrating its huge carbon-neutral potential benefits.
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Affiliation(s)
- Weixin Zhao
- State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Jia You
- State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Shilei Yin
- State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Shufei He
- State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Likui Feng
- State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Jianju Li
- State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Qingliang Zhao
- State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Liangliang Wei
- State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin 150090, China.
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12
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Lee DJ, Taherzadeh MJ, Tyagi RD, Chen C. Advanced activated sludge processes toward circular bioeconomy. BIORESOURCE TECHNOLOGY 2023; 368:128325. [PMID: 36396036 DOI: 10.1016/j.biortech.2022.128325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Affiliation(s)
- Duu-Jong Lee
- Department of Mechanical Engineering, City University of Hong Kong, Kwoloon Tong, Hong Kong.
| | - Mohammad J Taherzadeh
- Department of Resource Recovery and Building Technology, University of Borås, Borås, Sweden
| | | | - Chuan Chen
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, Heilongjiang Province 150090, China
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13
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Ferrous-Iron-Activated Sulfite-Accelerated Short-Chain Fatty Acid Production from Waste-Activated Sludge Fermentation: Process Assessment and Underlying Mechanism. FERMENTATION 2022. [DOI: 10.3390/fermentation9010020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
To break the bottlenecks of slow hydrolysis and low acid production efficiency of waste-activated sludge (WAS) in the traditional anaerobic fermentation process, this study investigated the employment of ferrous-iron (Fe(II))-activated sulfite to produce hydroxyl, sulfate, and other highly oxidizing radicals on WAS floc cracking and short-chain fatty acid (SCFAs) production during anaerobic fermentation. The effect of the dosage ratio of Fe(II)/S(IV) was also studied. Results showed that the combined pretreatment of Fe(II)-activated sulfite significantly promoted the exfoliation of extracellular polymers and the subsequent SCFAs production. The highest concentration of SCFAs reached 7326.5 mg COD/L under the optimal dosage of 1:2 for Fe(II)/S(IV), which was 1.1~2.1 times higher than that of other research groups. Meanwhile, the analysis by 3D fluorescence spectroscopy and EPR (electron paramagnetic resonance) showed that Fe(II)-activated sulfite had a synergistic effect on the rupture of sludge cells and the stripping of extracellular polymers, with SO4− and OH as the key radicals generated and being much stronger in the 1:1 and 1:2 groups. High-throughput sequencing showed that the Fe(II)-activated sulfite system significantly changed the functional microbial diversity. The anaerobic fermentation bacteria and sulfate-reducing bacteria were significantly enriched. The underlying mechanism of Fe(II)-activated sulfite oxidation and molecular ecological network of key microbiomes were unveiled.
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