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Liu J, Zhang Y, Huang J, Yang L, Yang Y, Deng G, Hu D, Yan C. Fe oxides nano-modified pumice enhances hydrogenotrophic methanogenesis in anaerobic digestion: Performance and mechanism of microbial community. J Environ Sci (China) 2025; 154:114-127. [PMID: 40049860 DOI: 10.1016/j.jes.2024.08.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2024] [Revised: 08/01/2024] [Accepted: 08/04/2024] [Indexed: 05/13/2025]
Abstract
Anaerobic digestion (AD), as an eco-friendly biological process, shows potential for the decomposition of leachate produced by waste incineration power plants. In this study, the effects of Fe oxides nano-modified pumice (FNP) were investigated on the fresh leachate AD process. Firstly, a simple hydrothermal method was used to prepare FNP, then introduced into the UASB reactor to evaluate its AD efficiency. Results showed that the inclusion of FNP could shorten the lag phase by 10 days compared to the control group. Furthermore, cumulative methane production in the FNP group was enhanced by 20.11%. Mechanistic studies suggested that hydrogenotrophic methanogenesis in the FNP group was more pronounced due to the influence of key enzymes (i.e., dehydrogenase and coenzyme F420). Microbial community analysis demonstrated that FNP could enhance the abundance of Methanosarcina, Proteobacteria, Sytrophomonas, and Limnobacter, which might elevate enzyme activity involved in methane production. These findings suggest that FNP might mediate interspecies electron transfer among these microorganisms, which is essential for efficient leachate treatment.
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Affiliation(s)
- Jiaqi Liu
- School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, China
| | - Yong Zhang
- School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, China; Pollution Control and Resource Utilization in Industrial Parks Joint Laboratory of Anhui Province, Hefei 230601, China.
| | - Jian Huang
- School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, China; Pollution Control and Resource Utilization in Industrial Parks Joint Laboratory of Anhui Province, Hefei 230601, China
| | - Lili Yang
- School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, China
| | - Yuzhou Yang
- School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, China
| | - Guohao Deng
- School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, China
| | - Dingcheng Hu
- CSCEC AECOM Consultants Co., Ltd., Lanzhou 730000, China
| | - Chuanchuan Yan
- CSCEC AECOM Consultants Co., Ltd., Lanzhou 730000, China
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Peng Y, Jiang L, Wu J, Yang J, Guo Z, Miao M, Peng Z, Chang M, Miao B, Liu H, Liang Y, Yin H, He Q, Liu X. Red Mud Potentially Alleviates Ammonia Nitrogen Inhibition in Swine Manure Anaerobic Digestion by Enhancing Phage-Mediated Ammonia Assimilation. Microorganisms 2025; 13:690. [PMID: 40142582 PMCID: PMC11944383 DOI: 10.3390/microorganisms13030690] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2025] [Revised: 03/13/2025] [Accepted: 03/17/2025] [Indexed: 03/28/2025] Open
Abstract
Red mud has been demonstrated to improve the methane production performance of anaerobic digestion (AD). However, the influence of red mud on ammonia nitrogen inhibition during AD through the mediating role of bacteria-phages interactions in this process remains poorly understood. Thus, this study investigated the impact of red mud on nitrogen metabolism in AD and characterized the phage and prokaryotic communities through a metagenomic analysis. The results showed that red mud significantly increased methane production by 23.1% and promoted the conversion of ammonia nitrogen into organic nitrogen, resulting in a 4.8% increase in total nitrogen. Simultaneously, it enriched the key microbial genera Methanothrix, Proteinophilum, and Petrimonas by 0.5%, 0.8%, and 2.7%, respectively, suggesting an enhancement in syntrophic acetate oxidation with greater ammonia tolerance. A viral metagenomic analysis identified seven nitrogen-metabolism-related auxiliary metabolic genes (AMGs), with glnA (encoding glutamine synthetase) being the most abundant. Compared to the control treatments, the red mud treatments led to a higher abundance of temperate phages and an increased number of AMGs. Furthermore, two new hosts carrying glnA (Mycolicibacteria smegmatis and Kitasatopola aureofaciens) were predicted, indicating that red mud expanded the host range of phages and promoted the spread of AMGs. Overall, our findings highlight the importance of phages in alleviating ammonia nitrogen inhibition and provide a novel understanding of the role of red mud in the AD of swine manure.
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Affiliation(s)
- Yulong Peng
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; (Y.P.); (J.W.); (J.Y.); (Z.G.); (M.M.); (Z.P.); (M.C.); (B.M.); (H.L.); (Y.L.); (H.Y.); (X.L.)
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha 410083, China
| | - Luhua Jiang
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; (Y.P.); (J.W.); (J.Y.); (Z.G.); (M.M.); (Z.P.); (M.C.); (B.M.); (H.L.); (Y.L.); (H.Y.); (X.L.)
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha 410083, China
| | - Junzhao Wu
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; (Y.P.); (J.W.); (J.Y.); (Z.G.); (M.M.); (Z.P.); (M.C.); (B.M.); (H.L.); (Y.L.); (H.Y.); (X.L.)
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha 410083, China
| | - Jiejie Yang
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; (Y.P.); (J.W.); (J.Y.); (Z.G.); (M.M.); (Z.P.); (M.C.); (B.M.); (H.L.); (Y.L.); (H.Y.); (X.L.)
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha 410083, China
| | - Ziwen Guo
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; (Y.P.); (J.W.); (J.Y.); (Z.G.); (M.M.); (Z.P.); (M.C.); (B.M.); (H.L.); (Y.L.); (H.Y.); (X.L.)
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha 410083, China
| | - Manjun Miao
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; (Y.P.); (J.W.); (J.Y.); (Z.G.); (M.M.); (Z.P.); (M.C.); (B.M.); (H.L.); (Y.L.); (H.Y.); (X.L.)
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha 410083, China
| | - Zhiyuan Peng
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; (Y.P.); (J.W.); (J.Y.); (Z.G.); (M.M.); (Z.P.); (M.C.); (B.M.); (H.L.); (Y.L.); (H.Y.); (X.L.)
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha 410083, China
| | - Meng Chang
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; (Y.P.); (J.W.); (J.Y.); (Z.G.); (M.M.); (Z.P.); (M.C.); (B.M.); (H.L.); (Y.L.); (H.Y.); (X.L.)
| | - Bo Miao
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; (Y.P.); (J.W.); (J.Y.); (Z.G.); (M.M.); (Z.P.); (M.C.); (B.M.); (H.L.); (Y.L.); (H.Y.); (X.L.)
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha 410083, China
| | - Hongwei Liu
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; (Y.P.); (J.W.); (J.Y.); (Z.G.); (M.M.); (Z.P.); (M.C.); (B.M.); (H.L.); (Y.L.); (H.Y.); (X.L.)
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha 410083, China
| | - Yili Liang
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; (Y.P.); (J.W.); (J.Y.); (Z.G.); (M.M.); (Z.P.); (M.C.); (B.M.); (H.L.); (Y.L.); (H.Y.); (X.L.)
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha 410083, China
| | - Huaqun Yin
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; (Y.P.); (J.W.); (J.Y.); (Z.G.); (M.M.); (Z.P.); (M.C.); (B.M.); (H.L.); (Y.L.); (H.Y.); (X.L.)
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha 410083, China
| | - Qiang He
- Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, TN 37996, USA;
| | - Xueduan Liu
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; (Y.P.); (J.W.); (J.Y.); (Z.G.); (M.M.); (Z.P.); (M.C.); (B.M.); (H.L.); (Y.L.); (H.Y.); (X.L.)
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha 410083, China
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Oliveira HR, Anacleto TM, Abreu F, Enrich-Prast A. New insights into the factors influencing methanogenic pathways in anaerobic digesters. Anaerobe 2025; 91:102925. [PMID: 39617252 DOI: 10.1016/j.anaerobe.2024.102925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2024] [Revised: 11/25/2024] [Accepted: 11/27/2024] [Indexed: 12/09/2024]
Abstract
INTRODUCTION Anaerobic digestion integrates waste treatment, energy generation, and nutrient recycling, producing methane mainly through acetoclastic (AM) and hydrogenotrophic methanogenesis (HM). Methanogenic pathway management can improve biogas productivity and quality. The balance between pathways is influenced by environmental and physicochemical conditions, with conflicting results on the effect of different factors often reported. This systematic review aims to clarify the influence of various parameters on methanogenic pathways in anaerobic digesters. METHODS Literature search was conducted in the Web of Science and Scopus databases. The effects of different parameters on the predominant methanogenic pathway were evaluated using Kruskal-Wallis tests and Spearman's rank correlation. RESULTS Thermophilic temperatures and high free ammonia nitrogen concentrations (>300 mg L-1) increase HM, with a strong combined effect of these variables. Conversely, under moderate temperature and ammonia concentrations, the primary feedstock influences the methanogenic pathway, with algae biomass, pig manure, and food industry wastewater showing the lowest contribution of hydrogenotrophic methanogens. pH effect varied with temperature, with acidic and alkaline pH favoring HM in mesophilic and thermophilic digesters, respectively. Furthermore, higher levels of volatile fatty acids (>2000 mg L-1), carbohydrates (>10 g/L) and lipids (>10 g/L) also appeared to favor HM over AM, while most metals - especially Cr, Se and W - promoted AM. CONCLUSION This study emphasizes the role of various factors in methanogenic pathway selection, highlighting the impact of previously overlooked parameters, such as inorganic elements and organic matter composition. These insights are essential for understanding the methanogenic pathway balance and optimizing biogas processes.
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Affiliation(s)
- Helena Rodrigues Oliveira
- Centro Federal de Educação Tecnológica Celso Suckow da Fonseca (CEFET/RJ), Rio de Janeiro, Brazil; Programa de Pós-Graduação em Biotecnologia Vegetal e Bioprocessos, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil; Unidade Multiusuário de Análises Ambientais, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Thuane Mendes Anacleto
- Programa de Pós-Graduação em Biotecnologia Vegetal e Bioprocessos, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil; Unidade Multiusuário de Análises Ambientais, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Fernanda Abreu
- Programa de Pós-Graduação em Biotecnologia Vegetal e Bioprocessos, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil; Unidade Multiusuário de Análises Ambientais, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil; Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Alex Enrich-Prast
- Unidade Multiusuário de Análises Ambientais, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil; Department of Thematic Studies - Environmental Change and Biogas Solutions Research Center (BSRC), Linköping University, Linköping, Sweden; Institute of Marine Science, Federal University of São Paulo (IMar/UNIFESP), Santos, Brazil.
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Chiang PF, Zhang TL, Giwa AS, Maurice NJ, Claire MJ, Ali N, Shafique E, Vakili M. Effects of Calcium-Oxide-Modified Biochar on the Anaerobic Digestion of Vacuum Blackwater. Molecules 2025; 30:215. [PMID: 39860085 PMCID: PMC11767887 DOI: 10.3390/molecules30020215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2024] [Revised: 01/01/2025] [Accepted: 01/03/2025] [Indexed: 01/27/2025] Open
Abstract
The increasing global population and urbanization have led to significant challenges in waste management, particularly concerning vacuum blackwater (VBW), which is the wastewater generated from vacuum toilets. Traditional treatment methods, such as landfilling and composting, often fall short in terms of efficiency and sustainability. Anaerobic digestion (AD) has emerged as a promising alternative, offering benefits such as biogas production and digestate generation. However, the performance of AD can be influenced by various factors, including the composition of the feedstock, pH levels, and the presence of inhibitors. This review investigates the effects of calcium oxide (CaO)-modified biochar (BC) as an additive in AD of VBW. Modifying BC with CaO enhances its alkalinity, nutrient retention, and adsorption capacity, creating a more favorable environment for microorganisms and promoting biogas production, which serves as a valuable source of heat, fuel and electricity. Additionally, the digestate can be processed through plasma pyrolysis to ensure the complete destruction of pathogens while promoting resource utilization. Plasma pyrolysis operates at extremely high temperatures, effectively sterilizing the digestate and eliminating both pathogens and harmful contaminants. This process not only guarantees the safety of the end products, but also transforms organic materials into valuable outputs such as syngas and slag. The syngas produced is a versatile energy carrier that can be utilized as a source of hydrogen, electricity, and heat, making it a valuable resource for various applications, including fuel cells and power generation. Furthermore, the slag has potential for reuse as an additive in the AD process or as a biofertilizer to enhance soil properties. This study aims to provide insights into the benefits of using modified BC as a co-substrate in AD systems. The findings will contribute to the development of more sustainable and efficient waste management strategies, addressing the challenges associated with VBW treatment while promoting renewable energy production.
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Affiliation(s)
- Ping Fa Chiang
- School of Economics and Management, Nanchang Institute of Science and Technology, Nanchang 330100, China;
| | - Teng Ling Zhang
- School of Education, Nanchang Institute of Science and Technology, Nanchang 330108, China;
| | - Abdulmoseen Segun Giwa
- School of Civil and Environmental Engineering, Nanchang Institute of Science and Technology, Nanchang 330108, China
| | | | | | - Nasir Ali
- Department of Biological and Health Sciences, Pak-Austria Fachhochschule: Institute of Applied Sciences and Technology, Khanpur Road, Haripur 22621, Pakistan;
| | - Ehtisham Shafique
- Department of Biological and Health Sciences, Pak-Austria Fachhochschule: Institute of Applied Sciences and Technology, Khanpur Road, Haripur 22621, Pakistan;
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Wang X, Campuzano S, Guenne A, Mazéas L, Chapleur O. Inhibition of anaerobic digestion by various ammonia sources resulted in subtle differences in metabolite dynamics. CHEMOSPHERE 2024; 351:141157. [PMID: 38218245 DOI: 10.1016/j.chemosphere.2024.141157] [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: 09/11/2023] [Revised: 12/22/2023] [Accepted: 01/07/2024] [Indexed: 01/15/2024]
Abstract
The impact of ammonia on anaerobic digestion performance and microbial dynamics has been extensively studied, but the concurrent effect of anions brought by ammonium salt should not be neglected. This paper studied this effect using metabolomics and a time-course statistical framework. Metabolomics provides novel perspectives to study microbial processes and facilitates a more profound understanding at the metabolic level. The advanced statistical framework enables deciphering the complexity of large metabolomics data sets. More specifically, a series of lab-scale batch reactors were set up with different ammonia sources added. Samples of nine time points over the degradation were analyzed with liquid chromatography-mass spectrometry. A filtering procedure was applied to select the promising metabolomic peaks from 1262 peaks, followed by modeling their intensities across time. The metabolomic peaks with similar time profiles were clustered, evidencing the correlation of different biological processes. Differential analysis was performed to seek the differences in metabolite dynamics caused by different anions. Finally, tandem mass spectrometry and metabolite annotation provided further information on the molecular structure and possible metabolic pathways. For example, the consumption of 5-aminovaleric acid, a short-chain fatty acid obtained from l-lysine degradation, was slowed down by phosphates. Overall, by investigating the effect of anions on anaerobic digestion, our study demonstrated the effectiveness of metabolomics in providing detailed information in a set of samples from different experimental conditions. With the statistical framework, the approach enables capturing subtle differences in metabolite dynamics between samples while accounting for the differences caused by time variations.
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Affiliation(s)
- Xiaoqing Wang
- Université Paris-Saclay, INRAE, PRocédés biOtechnologiques au Service de l'Environnement, 92761, Antony, France
| | - Stephany Campuzano
- Université Paris-Saclay, INRAE, PRocédés biOtechnologiques au Service de l'Environnement, 92761, Antony, France
| | - Angéline Guenne
- Université Paris-Saclay, INRAE, PRocédés biOtechnologiques au Service de l'Environnement, 92761, Antony, France
| | - Laurent Mazéas
- Université Paris-Saclay, INRAE, PRocédés biOtechnologiques au Service de l'Environnement, 92761, Antony, France
| | - Olivier Chapleur
- Université Paris-Saclay, INRAE, PRocédés biOtechnologiques au Service de l'Environnement, 92761, Antony, France.
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Geng H, Xu Y, Dai X, Yang D. Abiotic and biotic roles of metals in the anaerobic digestion of sewage sludge: A review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 912:169313. [PMID: 38123094 DOI: 10.1016/j.scitotenv.2023.169313] [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: 10/24/2023] [Revised: 12/09/2023] [Accepted: 12/10/2023] [Indexed: 12/23/2023]
Abstract
Anaerobic digestion (AD) is a promising technique for sludge treatment and resource recovery. Metals are very important components of sludge and can have substantial effects on its complex nature and microbial activity. However, systematic reviews have not addressed how metals in sludge affect AD and how they can be regulated to improve AD. This paper comprehensively reviews the effects of metals on the AD of sludge from both abiotic and biotic perspectives. First, we introduce the contents and basic characteristics (e.g., chemical forms) of intrinsic metals in sewage sludge. Then, we summarise the main mechanism by which metals influence sludge properties and the methods for removing metals and thus improving AD. Next, we analyze the effects of both intrinsic and exogenous metals on the enzymes and microbial communities involved in anaerobic bioconversion, focusing on the types, critical concentrations and valence states of the metals. Finally, we propose ideas for future research on the roles of metals in the AD of sludge. In summary, this review systematically clarifies the roles of metals in the AD of sludge and provides a reference for improving AD by regulating these metals.
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Affiliation(s)
- Hui Geng
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China
| | - Ying Xu
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, PR China.
| | - Xiaohu Dai
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, PR China
| | - Dianhai Yang
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China
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Chandrasekaran S, Banu JR, Kumar G. Effect of thermal-calcium peroxide mediated exopolymer release on disperser pre-treatment for efficient anaerobic digestion. ENVIRONMENTAL RESEARCH 2023; 235:116635. [PMID: 37454801 DOI: 10.1016/j.envres.2023.116635] [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: 04/25/2023] [Revised: 07/02/2023] [Accepted: 07/10/2023] [Indexed: 07/18/2023]
Abstract
The present study aimed to improve the hydrolysis potential of paper mill sludge through a two-phase disintegration process. In Particular, attention was focused on removal of extracellular polymeric substance (EPS) i.e. deflocculation of sludge in order to improve the efficiency of subsequent disperser disintegration. During deflocculation, carbohydrate, protein and deoxyribonucleic acids (DNA) were used as assessment parameters. During disintegration, soluble chemical oxygen demand (SCOD) and suspended solids (SS) reduction were used as assessment index to evaluate the efficiency of disintegration. A greater EPS removal was attained while deflocculating the sludge at calcium peroxide dosage of 0.05 g/g suspended solids (SS) and at a temperature of 70 °C. When comparing the disintegrated samples, a clear variation was noted in deflocculated and disintegrated sludge (19.2%) than the disintegrated sludge alone (13.5%). This clearly shows the need for deflocculation prior to disintegration. Likewise, a higher biomethane production of 0.214 L/g COD was achieved in deflocculated and disintegrated sludge than the pretreated sludge alone. Deflocculation reduces sludge management cost from 170 USD (Disperser alone (D alone disintegration)) to 51 USD (Thermal calcium peroxide mediated-Disperser (TCaO2-D disintegration), indicating the efficiency of the proposed disintegration.
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Affiliation(s)
- Sivaraman Chandrasekaran
- Center of Excellence in Environmental Studies (CEES), King Abdulaziz University, Jeddah, 21589, Saudi Arabia
| | - J Rajesh Banu
- Department of Biotechnology, Central University of Tamil Nadu, Neelakudi, Thiruvarur, 610005, Tamil Nadu, India
| | - Gopalakrishnan Kumar
- School of Civil and Environmental Engineering, Yonsei University, Seoul, 03722, South Korea; Department of Chemistry, Bioscience and Environmental Engineering, Faculty of Science and Technology, University of Stavanger, Forus 4036, Stavanger, Norway.
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Su J, Lv W, Ren L, Kong X, Luo L, Awasthi MK, Yan B. Effect of water regime on the dynamics of free ammonia during high solid anaerobic digestion of pig manure. CHEMOSPHERE 2023; 312:137328. [PMID: 36410500 DOI: 10.1016/j.chemosphere.2022.137328] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 11/13/2022] [Accepted: 11/17/2022] [Indexed: 06/16/2023]
Abstract
Free ammonia (FAN) inhibition is commonly encountered during high solid anaerobic digestion (HSAD) of pig manure. The performance of HSAD is highly related to its operational water regime; however, little information is available regarding the dynamics of free ammonia with varied water regimes. In this work, four treatments were set with equal amount of water supply but varied addition frequencies, i.e. add once but at different times in treatments T1 and T2, add twice in T3 while it was three times in treatment T4. Results showed that the whole methanogenic process ran smoothly with the average methane gas production rate maintaining at 191.1 LCH4/kgVSadded. Although a higher methane gas production rate of 217.4 LCH4/kgVSadded was achieved in T1, one time water addition triggered a higher ammonia inhibition potential. Cumulative FAN release was 6.03 mgFAN/kgVSadded in T1 while the balance between FAN and ammonia tended to the fraction of FAN. In T4, cumulative FAN of 5.07 mgFAN/kgVSadded was evolved, which was lower than that in T1 but similar to the situation in T2. The lowest FAN was observed in T3, indicating that a moderate frequency of dilution might be conducive to alleviate free ammonia inhibition.
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Affiliation(s)
- Jian Su
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Wenjuan Lv
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Liheng Ren
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Xiaoliang Kong
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Lin Luo
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Mukesh Kumar Awasthi
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province, 712100, China.
| | - Binghua Yan
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China.
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