Article
Engineering, Environmental
Nicolas Goycoechea, Ignacio Borges, Elena Castello, Liliana Borzacconi
Summary: The current disposal of biosludge is costly and environmentally problematic. This study investigates the potential of using thermal hydrolysis to improve the anaerobic digestion of biological sludge from the cellulose industry. The results show that thermal pretreatment at temperatures of 140°C and 165°C for 45 minutes enhances methane production and biodegradability of the sludge.
WASTE MANAGEMENT & RESEARCH
(2023)
Article
Environmental Sciences
Kang Song, Zhouyang Li, Xu Zhou, Guojun Xie, Lu Li, Shengyan Pu
Summary: The study investigated the potential of improving methane production from algal sludge anaerobic digestion by peroxydisulfate (PDS) pretreatment. Results showed that PDS dosage at 0.02 g PDS/g algal sludge TSS led to the highest accumulative methane production after 60 days fermentation. The addition of PDS inhibited microbial activities but improved short chain fatty acids production.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Huan Liu, Xuan Li, Ting Zhou, Zehao Zhang, Long D. Nghiem, Li Gao, Qilin Wang
Summary: This study comprehensively evaluated the impact of free ammonia (FA) pretreatment on the performance of anaerobic primary sludge (PS) digestion using semi-continuous systems. FA pretreatment improved the removal of volatile solids, chemical oxygen demand, and methane production. It also increased the biomass-specific hydrolysis rate of digesters. Model-based analysis revealed that the enhanced performance is due to the increased apparent hydrolysis rate and degradability extent of PS caused by FA pretreatment. Additionally, dewaterability of digested sludge and removals of fecal coliform and E. coli were enhanced by FA pretreatment.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Tianwei Hao, Zheng Liu, Muxiang Liang, Xiaoming Liu, Jing Chen, Xiaohui Wu, Sunita Varjani, Feixiang Zan
Summary: This study demonstrates the significant impact of sulfite pretreatment on the solubilization and substrate release of PS, as well as the reduction of methane production from PS. Additionally, sulfite pretreatment affects the functional groups and degradation extent of PS.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Agricultural Engineering
Haixiao Guo, Yufen Wang, Lixin Tian, Wei Wei, Tingting Zhu, Yiwen Liu
Summary: This study proposed a novel POM-based pretreatment technology to improve methane production from waste activated sludge for the first time, which increased methane production by 43.7%. The mechanism analysis revealed that POM pretreatment promoted WAS disintegration and improved the biodegradability of the released organics, resulting in positive impacts on the activity of enzymes associated with hydrolysis/acidification/methanogenesis. The microbial community analysis showed a shift towards increase hydrolytic and acidification-associated microbes and enriched the abundance of Methanosaeta sp.
BIORESOURCE TECHNOLOGY
(2021)
Article
Agricultural Engineering
Bing Guo, Jiawei Hu, Jingsi Zhang, Zhigen Wu, Zhuo Li
Summary: The combined pretreatment of potassium ferrate and ultrasound showed a positive synergy in enhancing methane yield from sludge. It efficiently promoted sludge disintegration and increased the biodegradability of sludge organics. Additionally, the microbial community involved in anaerobic digestion of sludge was enriched by this pretreatment.
BIORESOURCE TECHNOLOGY
(2021)
Article
Engineering, Environmental
Huan Liu, Xuan Li, Zehao Zhang, Long D. Nghiem, Li Gao, Damien J. Batstone, Qilin Wang
Summary: Population growth has led to an increase in waste activated sludge (WAS) production, causing an urgent need for expanding sludge treatment capacity in wastewater treatment plants (WWTPs). This study demonstrated that free ammonia (FA) pretreatment can expand the treatment capacity of anaerobic digesters by up to 50% through reducing sludge retention time (SRT). The FA pretreatment improved the removal of pathogens and antibiotic resistance genes, making it a promising approach for WWTPs.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Kaihao Hou, Xi Luo, Muxiang Liang, Xiaoming Liu, Qi Xu, Jing Chen, Xiejuan Lu, Xiaohui Wu, Feixiang Zan
Summary: Waste activated sludge pretreatment with sulfite and heat can effectively improve sludge hydrolysis rate and methane production. By combining sulfite and heat pretreatment, soluble substances and methane production can be significantly enhanced. The HESP method shows promise in enhancing methane production and promoting methanogenic metabolism, but further experimentation is needed for specific conditions.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Engineering, Environmental
Qiuxiang Xu, Tian-Yi Luo, Ruo-Lan Wu, Wei Wei, Jing Sun, Xiaohu Dai, Bing-Jie Ni
Summary: The study demonstrates that rhamnolipid (RL) pretreatment has a promoting effect on methane production in two-phase anaerobic digestion of waste activated sludge, although methane production may be inhibited in the presence of RL during the acidogenic phase. Further analysis shows that the addition of RL can increase methane production throughout the entire two-phase anaerobic digestion process.
Article
Agricultural Engineering
A. Bokhary, M. Leitch, B. Q. Liao
Summary: This study investigated the long-term anaerobic treatment of pulp and paper primary sludge using a thermophilic anaerobic membrane bioreactor. Results showed that increasing the solid retention time (SRT) led to higher biogas yield, as well as changes in digestate characteristics and dewaterability. The findings suggest that the presence of lignin and cellulose increased in the digestate with longer SRTs, while nitrogen and carbon concentrations decreased.
BIOMASS & BIOENERGY
(2022)
Article
Environmental Sciences
Huan Liu, Xuan Li, Zehao Zhang, Long D. Nghiem, Qilin Wang
Summary: Urine pretreatment is an effective strategy to improve methane production in anaerobic digestion of waste activated sludge, with significant increases in methane production, degradation extent, and hydrolysis rate.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Zhen Li, Shuo Chen, Bingchuan Liu, Jiakuan Yang, Sha Liang, Keke Xiao, Jingping Hu, Huijie Hou
Summary: This study investigated a novel pretreatment strategy using SIC-H2O2 to enhance methane production in anaerobic digestion process. The results showed that SIC-H2O2 pretreatment enhanced sludge biodegradability by disintegrating sludge flocs and increasing SCOD. EEM-PARAFAC analysis revealed enhanced dissociation of TB-EPS fractions, while EPR results demonstrated the catalysis of H2O2 for generating center dot OH and high-valent (Por)FeIV(O) intermediates, promoting EPS disintegration.
ENVIRONMENTAL RESEARCH
(2022)
Article
Green & Sustainable Science & Technology
A. Bokhary, M. Leitch, B. Q. Liao
Summary: This study conducted long-term anaerobic digestion of primary sludge of a TMP in a ThAnMBR, showing that optimal results were achieved at lower OLR and higher HRT. However, it was found that biogas production and sludge biomass degradation decrease with increasing organic loading rate.
CLEAN TECHNOLOGIES AND ENVIRONMENTAL POLICY
(2021)
Article
Green & Sustainable Science & Technology
Liang Chen, Ziwei He, Luxin Yang, Lin Wang, Yangyang Li, Ting Chen, Huan Li
Summary: This study compares four common methods for treating food waste: incineration, anaerobic digestion, composting, and feed processing. The results show that anaerobic digestion is the best treatment option for minimizing carbon emissions, while composting has the highest carbon emissions. In terms of economic performance, feed processing is the best choice, while incineration results in high expenditure.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Environmental Sciences
Shu-Lin Wu, Wei Wei, Bing-Jie Ni
Summary: A novel sludge pretreatment technology using calcium hypochlorite (Ca(ClO)2) to enhance methane production from waste activated sludge (WAS) anaerobic digestion was reported. The results showed that appropriate doses of Ca(ClO)2 significantly increased the solubilization of WAS and methane production, while negatively affecting the microbial community composition and inhibiting microbial processes related to methane production.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)