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Li S, Zhang M, Hu H, Guo G, Gong L, Dong L, Xu S, Yao H. Fate of sulfur and chlorine during co-incineration of municipal solid waste and industrial organic solid waste. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 920:171040. [PMID: 38369161 DOI: 10.1016/j.scitotenv.2024.171040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Revised: 02/02/2024] [Accepted: 02/15/2024] [Indexed: 02/20/2024]
Abstract
In China, the co-incineration of municipal solid waste (MSW) with industrial organic solid waste (IOSW) is increasingly adopted. Compared with MSW, IOSW contains higher levels of sulfur (S) and chlorine (Cl), presenting significant challenges for controlling S/Cl emissions in MSW incineration plants. In this study, the impact of co-incinerating IOSW was investigated in a 500 t/d incinerator grate, focusing on the emissions and transformation behaviors of S/Cl. IOSW, with a consistent sulfur content of about 0.22 wt% and a more variable chlorine content averaging 0.53 wt%, contains over 40 % organic sulfur and >90 % organic chlorine, higher than in MSW. The results of co-incineration experiments showed that the median SO2 concentration in the flue gas was stable at 50 mg/m3, while HCl concentration decreased initially and then increased as the co-incineration ratio of IOSW rose from 20 % to 40 %. Furthermore, the concentrations of SO2 and HCl were not significantly influenced by wind flow but were positively affected by the rising furnace temperatures. Besides, the co-incineration ratio had minimal impact on sulfur in fly ash before deacidification, primarily derived from the gas stream. However, the (Na + K)/Cl ratio in fly ash progressively increased from 1.5 to 1.9, and the Ca content decreased from 0.35 % to 0.15 % as the co-incineration ratio rose to 40 %, indicating more chlorine migration into the fly ash at higher co-incineration rates. This research offers essential guidance for effectively controlling pollutant emissions during the co-incineration of IOSW, specifically the S/Cl pollutants.
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Affiliation(s)
- Shuai Li
- State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Mingmei Zhang
- State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Hongyun Hu
- State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Guangzhao Guo
- Grandblue (Foshan) Green Electricity Solid Waste Management Co., Ltd, Foshan 528200, China
| | - Lifang Gong
- State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China; Grandblue (Foshan) Green Electricity Solid Waste Management Co., Ltd, Foshan 528200, China
| | - Lu Dong
- State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Sihua Xu
- State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Hong Yao
- State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China
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Zhang W, Li Q, He Y, Wang Y, Wang L, Zhu Y. Effects of inherent components and disposal temperature on the melting behavior of petrochemical sludge char during CO 2 gasification. JOURNAL OF HAZARDOUS MATERIALS 2024; 463:132922. [PMID: 37939566 DOI: 10.1016/j.jhazmat.2023.132922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2023] [Revised: 10/27/2023] [Accepted: 11/01/2023] [Indexed: 11/10/2023]
Abstract
Pyrolysis-coupled gasification-melting is a promising technology as it can dispose of the petrochemical sludge (PS) and recover the leftover energy. Unfortunately, there has been little research investigating the effects of pyrolysis degree on melting characteristics of the pyrolysis residue (PR) and the transformation properties of the heavy metal (HM). In this study, the function of inherent components and disposal temperature were elucidated. The results show that the moisture and light volatile could disperse the melting residue (MR) during gasification-melting treatment, causing different morphology and color of the MR. In addition, as pyrolysis temperature increased, the HMs speciation (e.g. Zn, Cu, and Cr) in the PR was transformed from bioavailable to a stable state, and the yield of PR decreased from 66.8% to 36.5%. The PR produced at 800 °C could decrease about 0.9 ∼ 1.9 potential ecological risk of releasing substances during the subsequent high-temperature gasification-melting owing to its stable HMs state and less char composition. Moreover, the gasification at 1250 °C could realize the safe disposal of the PR. Further increasing the gasification temperature to 1450 °C could not improve the acid-leaching resistance of the HMs, although the apparent concentration of C and the acid dissolution proportion of slag decreased by 6.3% and 1.7%, respectively.
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Affiliation(s)
- Wenqi Zhang
- School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, Jiangsu, China; Jiangsu Province Engineering Research Center of Organic Solid Wastes Deeply Treatment and Hydrogen Production, Jiangsu, China
| | - Qingdong Li
- School of Energy Science and Engineering, Nanjing Tech University, Nanjing 211816, Jiangsu, China; Jiangsu Province Engineering Research Center of Organic Solid Wastes Deeply Treatment and Hydrogen Production, Jiangsu, China
| | - Yahui He
- School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, Jiangsu, China; Jiangsu Province Engineering Research Center of Organic Solid Wastes Deeply Treatment and Hydrogen Production, Jiangsu, China
| | - Yinfeng Wang
- School of Energy Science and Engineering, Nanjing Tech University, Nanjing 211816, Jiangsu, China; Jiangsu Province Engineering Research Center of Organic Solid Wastes Deeply Treatment and Hydrogen Production, Jiangsu, China.
| | - Lei Wang
- Jiangsu Province Engineering Research Center of Organic Solid Wastes Deeply Treatment and Hydrogen Production, Jiangsu, China; School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211816, Jiangsu, China
| | - Yuezhao Zhu
- School of Energy Science and Engineering, Nanjing Tech University, Nanjing 211816, Jiangsu, China; Jiangsu Province Engineering Research Center of Organic Solid Wastes Deeply Treatment and Hydrogen Production, Jiangsu, China
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Wang X, Wang H, Zhang Z, Li J, Zhang H, Wang W, Mao Y, Song Z. Calcination of sewage sludge-based sulphoaluminate cement clinker: Mineral formation mechanism and heavy metal transition behaviors. ENVIRONMENTAL RESEARCH 2023; 237:116986. [PMID: 37633637 DOI: 10.1016/j.envres.2023.116986] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 07/19/2023] [Accepted: 08/23/2023] [Indexed: 08/28/2023]
Abstract
Utilizing sewage sludge (SS) to calcinate sulphoaluminate cement (SAC) is a promising technology for low-carbon transition of cement industry, but the unclear effects of SS-contained heavy metals limit the application of this technology. In this study, the effects of SS addition on the calcination of SAC clinker and the transformation of heavy metals were studied from the aspects of mineral phase change, microstructure evolution and heavy metal speciation respectively, covering the mineral formation temperature 900-1250 °C. The results show that the added SS will reduce the formation temperature and change the reaction pathways of mineral phases. When the content of SS increases from 10% to 25%, the compositions of mesophases CaO·Al2O3 and 4CaO·2SiO2·CaSO4 increase by 6.33% and 9.73%, respectively. Meanwhile, the formation of minerals will solidify Zn, Ni, Mn, Cu, Cr, and convert them into a more stable fraction (residual fraction), indicating a lower probability to harm the environment. Moreover, heavy metals present different migration behaviors. After calcination, Mn migrates from SS to 4CaO·Al2O3·Fe2O3 (52.48%), while Zn prefers to enter 3CaO·3Al2O3·CaSO4 (43.74%) and 4CaO·Al2O3·Fe2O3 (38.06%). This study offers new insights into the mineral formation mechanism and heavy metal transition behaviors of sewage sludge-based SAC.
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Affiliation(s)
- Xujiang Wang
- National Engineering Laboratory for Reducing Emissions from Coal Combustion, Jinan, Shandong, 250061, China; School of Energy and Power Engineering, Shandong University, Jinan, Shandong, 250061, China
| | - Haohao Wang
- National Engineering Laboratory for Reducing Emissions from Coal Combustion, Jinan, Shandong, 250061, China; School of Energy and Power Engineering, Shandong University, Jinan, Shandong, 250061, China
| | - Ziliang Zhang
- National Engineering Laboratory for Reducing Emissions from Coal Combustion, Jinan, Shandong, 250061, China; School of Energy and Power Engineering, Shandong University, Jinan, Shandong, 250061, China
| | - Jingwei Li
- National Engineering Laboratory for Reducing Emissions from Coal Combustion, Jinan, Shandong, 250061, China; School of Energy and Power Engineering, Shandong University, Jinan, Shandong, 250061, China.
| | - Hongzhi Zhang
- School of Qilu Transportation, Shandong University, Jinan, Shandong, 250061, China
| | - Wenlong Wang
- National Engineering Laboratory for Reducing Emissions from Coal Combustion, Jinan, Shandong, 250061, China; School of Energy and Power Engineering, Shandong University, Jinan, Shandong, 250061, China
| | - Yanpeng Mao
- National Engineering Laboratory for Reducing Emissions from Coal Combustion, Jinan, Shandong, 250061, China; School of Energy and Power Engineering, Shandong University, Jinan, Shandong, 250061, China
| | - Zhanlong Song
- National Engineering Laboratory for Reducing Emissions from Coal Combustion, Jinan, Shandong, 250061, China; School of Energy and Power Engineering, Shandong University, Jinan, Shandong, 250061, China
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Li D, Shan R, Gu J, Zhang Y, Zeng X, Lin L, Yuan H, Chen Y. Co-pyrolysis of textile dyeing sludge/litchi shell and CaO: Immobilization of heavy metals and the analysis of the mechanism. WASTE MANAGEMENT (NEW YORK, N.Y.) 2023; 171:382-392. [PMID: 37776809 DOI: 10.1016/j.wasman.2023.09.024] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 09/17/2023] [Accepted: 09/20/2023] [Indexed: 10/02/2023]
Abstract
To relieve the secondary contamination of heavy metals (HMs), the synergistic effect of co-pyrolysis of textile dyeing sludge (DS)/litchi shell (LS) and CaO on the migration of HMs was demonstrated in this study. The proportions of Cu, Zn, Cr, Mn, and Ni in the F4 fraction increased to 75%, 55%, 100%, 50%, and 62% at the suitable CaO dosages. When 10% CaO was added, the RI value of DLC-10% was reduced to 7.89, indicating low environmental risk. The characterizations of the physicochemical properties of biochar provided support for the HMs immobilization mechanism. HMs combined with inorganic minerals or functional groups to form new stable HMs crystalline minerals and complexes to achieve immobilization of HMs. The pH value and pore structure also play an important role in improving the immobilization performance of HMs. In conclusion, the results provided a new direction for the subsequent harmless treatment of HMs-enriched waste.
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Affiliation(s)
- Danni Li
- College of Energy, Xiamen University, Xiamen 361102, PR China; Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, PR China; CAS Key Laboratory of Renewable Energy, Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, PR China
| | - Rui Shan
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, PR China; CAS Key Laboratory of Renewable Energy, Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, PR China
| | - Jing Gu
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, PR China; CAS Key Laboratory of Renewable Energy, Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, PR China
| | - Yuyuan Zhang
- School of Materials Science and Hydrogen Energy, Foshan University, Foshan, Guangdong 528000, PR China
| | - Xianhai Zeng
- College of Energy, Xiamen University, Xiamen 361102, PR China; Fujian Engineering and Research Center of Clean and High-valued Technologies for Biomass, Xiamen University, Xiamen 361102, PR China; Xiamen Key Laboratory of High-valued Utilization of Biomass, Xiamen University, Xiamen 361102, PR China
| | - Lu Lin
- College of Energy, Xiamen University, Xiamen 361102, PR China; Fujian Engineering and Research Center of Clean and High-valued Technologies for Biomass, Xiamen University, Xiamen 361102, PR China; Xiamen Key Laboratory of High-valued Utilization of Biomass, Xiamen University, Xiamen 361102, PR China
| | - Haoran Yuan
- College of Energy, Xiamen University, Xiamen 361102, PR China; Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, PR China; CAS Key Laboratory of Renewable Energy, Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, PR China; Fujian Engineering and Research Center of Clean and High-valued Technologies for Biomass, Xiamen University, Xiamen 361102, PR China; Xiamen Key Laboratory of High-valued Utilization of Biomass, Xiamen University, Xiamen 361102, PR China.
| | - Yong Chen
- College of Energy, Xiamen University, Xiamen 361102, PR China; Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, PR China; CAS Key Laboratory of Renewable Energy, Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, PR China; Fujian Engineering and Research Center of Clean and High-valued Technologies for Biomass, Xiamen University, Xiamen 361102, PR China; Xiamen Key Laboratory of High-valued Utilization of Biomass, Xiamen University, Xiamen 361102, PR China
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Wang H, Chen D, Wen Y, Zhang Y, Liu Y, Xu R. Iron-rich red mud and iron oxide-modified biochars: A comparative study on the removal of Cd(II) and influence of natural aging processes. CHEMOSPHERE 2023; 330:138626. [PMID: 37028717 DOI: 10.1016/j.chemosphere.2023.138626] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2022] [Revised: 03/19/2023] [Accepted: 04/04/2023] [Indexed: 05/14/2023]
Abstract
Red mud (RM) is a byproduct of various processes in the aluminum industry and has recently been utilized for synthesizing RM-modified biochar (RM/BC), which has attracted significant attention in terms of waste reutilization and cleaner production. However, there is a lack of comprehensive and comparative studies on RM/BC and the conventional iron-salt-modified biochar (Fe/BC). In this study, RM/BC and Fe/BC were synthesized and characterized, and the influence on environmental behaviors of these functional materials with natural soil aging treatment was analyzed. After aging, the adsorption capacity of Fe/BC and RM/BC for Cd(II) decreased by 20.76% and 18.03%, respectively. The batch adsorption experiments revealed that the main removal mechanisms of Fe/BC and RM/BC are co-precipitation, chemical reduction, surface complexation, ion exchange, and electrostatic attraction, etc. Furthermore, practical viability of RM/BC and Fe/BC was evaluated through leaching and regenerative experiments. These results can not only be used to evaluate the practicality of the BC fabricated from industrial byproducts but can also reveal the environmental behavior of these functional materials in practical applications.
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Affiliation(s)
- Huabin Wang
- School of Energy and Environment Science, Yunnan Normal University, Kunming, 650500, PR China; Yunnan Key Laboratory of Rural Energy Engineering, Kunming, 650500, PR China; Yunnan Provincial Observation and Research Station of Soil Degradation and Restoration for Cultivating Plateau Traditional Chinese Medicinal Plants, Kunming, 650500, PR China.
| | - Dingxiang Chen
- School of Energy and Environment Science, Yunnan Normal University, Kunming, 650500, PR China; Yunnan Key Laboratory of Rural Energy Engineering, Kunming, 650500, PR China; Yunnan Provincial Observation and Research Station of Soil Degradation and Restoration for Cultivating Plateau Traditional Chinese Medicinal Plants, Kunming, 650500, PR China
| | - Yi Wen
- School of Energy and Environment Science, Yunnan Normal University, Kunming, 650500, PR China; Yunnan Key Laboratory of Rural Energy Engineering, Kunming, 650500, PR China; Yunnan Provincial Observation and Research Station of Soil Degradation and Restoration for Cultivating Plateau Traditional Chinese Medicinal Plants, Kunming, 650500, PR China
| | - Yong Zhang
- School of Energy and Environment Science, Yunnan Normal University, Kunming, 650500, PR China; Yunnan Key Laboratory of Rural Energy Engineering, Kunming, 650500, PR China; Yunnan Provincial Observation and Research Station of Soil Degradation and Restoration for Cultivating Plateau Traditional Chinese Medicinal Plants, Kunming, 650500, PR China
| | - Ying Liu
- School of Energy and Environment Science, Yunnan Normal University, Kunming, 650500, PR China; Yunnan Key Laboratory of Rural Energy Engineering, Kunming, 650500, PR China; Yunnan Provincial Observation and Research Station of Soil Degradation and Restoration for Cultivating Plateau Traditional Chinese Medicinal Plants, Kunming, 650500, PR China
| | - Rui Xu
- School of Energy and Environment Science, Yunnan Normal University, Kunming, 650500, PR China; Yunnan Key Laboratory of Rural Energy Engineering, Kunming, 650500, PR China; Yunnan Provincial Observation and Research Station of Soil Degradation and Restoration for Cultivating Plateau Traditional Chinese Medicinal Plants, Kunming, 650500, PR China.
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Mu L, Zhang B, Huang X, Wang Z, Yin H, Shang Y, Huo Z. Surface reaction mechanisms of CO with Fe-based oxygen carrier supported by CaO and K2CO3 in chemical looping combustion: Case study. Chem Eng Sci 2023. [DOI: 10.1016/j.ces.2023.118564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
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7
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Zheng X, Ying Z, Feng Y, Wang B, Dou B. CaO-assisted hydrothermal treatment combined with incineration of sewage sludge: Focusing on phosphorus (P) fractions, P-bioavailability, and heavy metals behaviors. CHEMOSPHERE 2022; 308:136391. [PMID: 36096311 DOI: 10.1016/j.chemosphere.2022.136391] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Revised: 08/23/2022] [Accepted: 09/06/2022] [Indexed: 06/15/2023]
Abstract
Dewatering of sewage sludge (SS) was the prerequisite for saving its drying energy and sustaining its stable combustion. Hydrothermal treatment (HT) has been a promising technology for improving SS dewaterability with high energy efficiency. However, the knowledge of phosphorus (P) transformation and heavy metals (HMs) behaviors in the combined HT and incineration process was still lack. P fractions, P-bioavailability, HMs speciation, and their environmental risk in the ash samples from this combination process were evaluated and compared with those from the co-incineration of SS and CaO. The combination process was superior to the latter one in the light of P and HMs. CaO preferred to enhance the transformation of non-apatite inorganic phosphorus (NAIP) to apatite phosphorus (AP) initially with enriched P and increased P-bioavailability in the resultant ash samples. The combination process further reduced the values of risk assessment code and individual contamination factor with the increment of the stable F4 fraction in HMs. Significant reduction of potential ecological risk was observed with the lowest global risk index of 43.76 in the combination process. Optimum CaO addition of 6% was proposed in terms of P and HMs. The work here can provide theoretical references for the potential utilization of P from SS to mitigate the foreseeable shortage of P rocks.
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Affiliation(s)
- Xiaoyuan Zheng
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China; Shanghai Key Laboratory of Heat Transfer and Multiphase Flow in Power Engineering, Shanghai, 200093, China
| | - Zhi Ying
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China
| | - Yuheng Feng
- Thermal and Environment Engineering Institute, School of Mechanical Engineering, Tongji University, Shanghai, 200092, China.
| | - Bo Wang
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China
| | - Binlin Dou
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China
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Zhang Z, Huang Y, Zhu Z, Yu M, Gu L, Wang X, Liu Y, Wang R. Effect of CaO and montmorillonite additive on heavy metals behavior and environmental risk during sludge combustion. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 312:120024. [PMID: 36029905 DOI: 10.1016/j.envpol.2022.120024] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Revised: 08/07/2022] [Accepted: 08/19/2022] [Indexed: 06/15/2023]
Abstract
Serious pollution is caused by heavy metals (HMs) emission during sludge combustion treatment, but the addition of minerals has the ability to alleviate the migration of HMs to the gaseous state. In this study, HMs (As, Cr, Zn and Cu) behavior, speciation, and environmental risk during sludge combustion with CaO and montmorillonite (MMT) additive was investigated in the lab-scale tube furnace. The results showed that the sludge combustion was mainly determined by volatile matter. In general, CaO inhibited the volatilization of Cr, Zn, and Cu, but promoted As volatilization. MMT inhibited the volatilization of HMs, but the effect was not obvious at high temperatures. Besides, the improvement of retention effect was not found for Cr and Cu with the increase of CaO at 1000 °C, there might exist threshold value for CaO on HMs retention process. Meanwhile, CaO increased acid-soluble fraction of As significantly at high temperatures, decreased residual fraction of Cr by oxidation, converted Zn and Cu to residual fraction. MMT increased the acid-soluble fraction of As and residual fraction of Cr. In view of the HMs environmental risk in ash, the combustion temperature of sludge was necessary to control under 1000 °C and minerals additive amount was needed to manage above 1000 °C.
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Affiliation(s)
- Zhenrong Zhang
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu, 210096, China; Huaneng Hunan Corporation, Changsha, Hunan, 410000, China
| | - Yaji Huang
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu, 210096, China.
| | - Zhicheng Zhu
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu, 210096, China
| | - Mengzhu Yu
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu, 210096, China
| | - Liqun Gu
- Baoshan Iron and Steel Ltd: Shanghai Baosteel Group Corp, Shanghai, 201900, China
| | - Xinyu Wang
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu, 210096, China
| | - Yang Liu
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu, 210096, China
| | - Ruyi Wang
- Baoshan Iron and Steel Ltd: Shanghai Baosteel Group Corp, Shanghai, 201900, China
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Zou H, Huang S, Ren M, Liu J, Evrendilek F, Xie W, Zhang G. Efficiency, by-product valorization, and pollution control of co-pyrolysis of textile dyeing sludge and waste solid adsorbents: Their atmosphere, temperature, and blend ratio dependencies. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 819:152923. [PMID: 34999078 DOI: 10.1016/j.scitotenv.2022.152923] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Revised: 12/31/2021] [Accepted: 01/01/2022] [Indexed: 06/14/2023]
Abstract
This study aimed to quantify the co-pyrolytic synergistic effects of textile dyeing sludge (TDS) and waste biochar (WBC) for an optimal utilization of secondary resources and to mitigate environmental pollution and waste volume. TDS and WBC had a strong synergistic effect between 800 and 900 °C in the CO2-assisted atmosphere. With the increased TDS fraction, NH3 emission fell significantly regardless of the atmosphere type. The CO2 atmosphere changed S in TDS char and released SO2 in the range of 800-1000 °C. With the temperature rise, an unstable N structure turned into a more stable heterocyclic N structure in the CO2 and N2 atmospheres. Regardless of the atmosphere type and temperature, the C-containing functional groups in co-pyrolytic biochar existed mainly as C-C/C-H. In the CO2 atmosphere, inorganic S, aliphatic S, and thiophene S in the co-pyrolytic biochar disappeared and became more stable sulfones. The co-pyrolysis inhibited the formation of S-containing compounds. The retention ability of the co-pyrolytic biochar peaked for most of the heavy metals in the N2 atmosphere but was better for Pb and Zn in the CO2 than N2 atmosphere. Simultaneous optimization showed the co-pyrolysis of 10% TDS and 90% WBC at above 950 °C in the N2-CO2 or CO2 atmosphere as the optimal operational settings combined.
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Affiliation(s)
- Huihuang Zou
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Shengzheng Huang
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Mingzhong Ren
- South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510655, China
| | - Jingyong Liu
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
| | - Fatih Evrendilek
- Department of Environmental Engineering, Bolu Abant Izzet Baysal University, Bolu 14052, Turkey
| | - Wuming Xie
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Gang Zhang
- Engineering Research Center of None-food Biomass Efficient Pyrolysis and Utilization Technology of Guangdong Higher Education Institutes, Dongguan University of Technology, Dongguan 523808, China
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10
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Jin M, Liu H, Deng H, Xiao H, Lu G, Yao H. Arsenic chemistry in municipal sewage sludge dewatering, thermal drying, and steam gasification: Effects of Fenton-CaO conditioning. WATER RESEARCH 2022; 213:118140. [PMID: 35152134 DOI: 10.1016/j.watres.2022.118140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 01/26/2022] [Accepted: 01/30/2022] [Indexed: 06/14/2023]
Abstract
In sludge disposal, Arsenic (As) poses serious secondary pollution due to its high toxicity and low stability. This work systematically studied the effects of Fenton-CaO composite conditioning on As chemistry throughout sludge dewatering, thermal drying, and steam gasification processes. The experimental results showed that, for raw sludge, 40.9% of As was released with filtrate discharging and 26.8-57.3% emitted with flue gas emission. When sludge was conditioned by Fenton-CaO, all of the As in the filtrate was fixed in the sludge cake and the releasing rate of gaseous As was reduced by up to 86.0%. Furthermore, the comprehensive results of the model compounds experiment, sequential extraction, and thermodynamic calculations revealed the effects of Fe/Ca conditioners on As species evolution. In the Fenton pre-oxidation, As(V) was reduced to As(III) due to the decreasing Eh caused by the excessive Fe(II). After adding CaO, As(III)/DMA (dimethyl arsenic) was adsorbed onto the surface of amorphous Fe(OH)3 that was introduced by Fenton's reagent, 50% and 43% of which were then oxidized or demethylated to form As(V)/MMA (monomethyl arsenic), respectively. In the following drying process at 120-180 °C, the FeOOH and CaO derived by residual Fe/Ca conditioners could promote the oxidation of 30% of the rest As(III) by the catalytic effect or directly reacting with it. In the final steam gasification process, the very little As(III) left in the dry sludge was released with the gas phase and the proportion of As(V) in gasification ash almost reached 100%. In short, Fenton-CaO composite conditioning could achieve the near-zero emission of As and reduce the toxicity of the products throughout the whole sludge treatment process.
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Affiliation(s)
- Minghao Jin
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Huan Liu
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; Department of New Energy Science and Engineering, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Hongping Deng
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; Department of New Energy Science and Engineering, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Han Xiao
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; Department of New Energy Science and Engineering, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Geng Lu
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; Department of New Energy Science and Engineering, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Hong Yao
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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Chen W, Liu S, Fu Y, Yan H, Qin L, Lai C, Zhang C, Ye H, Chen W, Qin F, Xu F, Huo X, Qin H. Recent advances in photoelectrocatalysis for environmental applications: Sensing, pollutants removal and microbial inactivation. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2021.214341] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Cai H, Liu J, Kuo J, Xie W, Evrendilek F, Zhang G. Ash-to-emission pollution controls on co-combustion of textile dyeing sludge and waste tea. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 794:148667. [PMID: 34323763 DOI: 10.1016/j.scitotenv.2021.148667] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Revised: 06/13/2021] [Accepted: 06/21/2021] [Indexed: 06/13/2023]
Abstract
Given the globally increased waste stream of textile dyeing sludge (TDS), its co-combustion with agricultural residues appears as an environmentally and economically viable solution in a circular economy. This study aimed to quantify the migrations and chemical speciations of heavy metals in the bottom ashes and gas emissions of the co-combustion of TDS and waste tea (WT). The addition of WT increased the fixation rate of As from 66.70 to 83.33% and promoted the chemical speciation of As and Cd from the acid extractable state to the residue one. With the temperature rise to 1000 °C, the fixation rates of As, Cd, and Pb in the bottom ashes fell to 27.73, 8.38, and 15.40%, respectively. The chemical speciation perniciousness of Zn, Cu, Ni, Mn, Cr, Cd, and Pb declined with the increased temperature. The ash composition changed with the new appearances of NaAlSi3O8, CaFe2O4, NaFe(SO4)2, and MgCrO4 at 1000 °C. The addition of WT increased CO2 and NOx but decreased SO2 emissions in the range of 680-1000 °C. ANN-based joint optimization indicated that the co-combustion emitted SO2 slightly less than did the TDS combustion. These results contribute to a better understanding of ash-to-emission pollution control for the co-combustion of TDS and WT.
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Affiliation(s)
- Haiming Cai
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Jingyong Liu
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
| | - Jiahong Kuo
- Department of Safety, Health and Environmental Engineering, National United University, Miaoli 36063, Taiwan
| | - Wuming Xie
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Fatih Evrendilek
- Department of Environmental Engineering, Bolu Abant Izzet Baysal University, Bolu 14052, Turkey
| | - Gang Zhang
- Engineering Research Center of None-food Biomass Efficient Pyrolysis and Utilization Technology of Guangdong Higher Education Institutes, Dongguan University of Technology, Dongguan 523808, China
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Poland’s Proposal for a Safe Solution of Waste Treatment during the COVID-19 Pandemic and Circular Economy Connection. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11093939] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The purpose of the study presented in this text is to show the influence of COVID-19 on waste management systems and circular economy stream, and their impact on circular economy, particularly the economic impact of the pandemic on the waste management sector, impact on circular economy objectives’ implementation as well as additional challenges like the need for hygienization of waste streams during different implementation efforts, such as changes in the municipal solid waste market and different waste processes of their disposal. Additionally, some methods—such as thermal treatment—which seemed to be not fully aligned with the circular economy approach have advantages not taken into account before. Incineration of higher volume of waste affects the waste structure and will change some of the circular economy objectives. The analysis was carried out on the example of the Polish market.
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