Article
Agricultural Engineering
Qi Song, Zheng Sun, Yong Chang, Weifeng Zhang, Yingzhi Lv, Jiayi Wang, Fenghao Sun, Yanxue Ma, Yuling Li, Fengbo Wang, Xiaoguang Chen
Summary: The study demonstrated a novel biological method to treat wastewater from the textile industry, proving its feasibility. By combining different types of bioreactors, efficient removal of COD and NH4+-N from PCW was achieved, providing a new alternative to traditional chemical methods.
BIORESOURCE TECHNOLOGY
(2021)
Article
Engineering, Environmental
Qi Song, Xiaoguang Chen, Weizhu Zhou, Xuehui Xie
Summary: In this study, a Spiral Symmetry Stream Anaerobic Bioreactor (SSSAB) was used to treat actual saline heparin sodium pharmaceutical wastewater (HSPW), achieving a COD removal rate of 82%, higher than other reactors at similar salinity. The main organic compounds in HSPW are benzenes, with the degradations of phenol and p-cresol as the major rate-limiting steps. The microbial community in anaerobic granular sludge (AGS) adapted to the HSPW treatment, demonstrating the superiority of the SSSAB structure.
Article
Engineering, Environmental
Xiaoguang Chen, Weizhu Zhou, Gongsong Li, Qi Song, Muhammad Ismail, Yiqi Wang, Luotong Ren, Chen Cheng
Summary: A 300m³/d demonstration project of soybean-process wastewater was established recently, using a Spiral Symmetric Stream Anaerobic Bioreactor (SSSAB) as the core. Through a Pilot-scale SSSAB (P-SSSAB) for 216 days of treatment, it was found that the bottom zone of the bed was the major contributor to COD removal, while the upper zone was the major contributor to NH4+-N increase. The anaerobic granular sludge (AGS) in the bed showed good granulation, and the microbial community in the AGS was more specific to the soybean-process wastewater.
Article
Environmental Sciences
Santo Fabio Corsino, Michele Carabillo, Alida Cosenza, Federica De Marines, Daniele Di Trapani, Francesco Traina, Michele Torregrossa, Gaspare Viviani
Summary: Insights into the mechanisms of excess sludge minimization in an oxic-settling-anaerobic (OSA) process were provided. Two parallel systems, a conventional activated sludge (CAS) system as control and an OSA system with pre-denitrification, were studied. The results showed that the OSA process had lower excess sludge production (12-41%) compared to the CAS system. The highest sludge reduction yield (40%) was achieved with scheme B and a hydraulic retention time (HRT) of 12 hours in the anaerobic reactor. Scheme A led to cell lysis and EPS destruction, while scheme B enabled maintenance and uncoupling metabolism, resulting in higher sludge reduction yield without compromising effluent quality.
Article
Engineering, Chemical
Aljaz Klasinc, Gregor Drago Zupancic, Matjaz Hribersek, Ales Hribernik, Aleksandra Lobnik, Matej Zadravec
Summary: The objective of this study was to determine the density of anaerobic granules at different heights in a full-scale Upflow Anaerobic Sludge Bed reactor. The density was calculated using measured settling velocities and a mathematical model based on the Stokes model. The results showed that the granule densities at different heights were independent of the reactor height.
Article
Engineering, Chemical
Yanjun Shao, Zhen Zhou, Jie Jiang, Lu-Man Jiang, Jianping Huang, Yi Zuo, Yuqing Ren, Xiaodan Zhao
Summary: This study investigated the impact of hydraulic retention time of anaerobic side-stream reactor (ASSR) on membrane filtration performance and fouling tendency in membrane bioreactors (MBR). The results showed that carrier-enhanced ASSR process had better sludge reduction efficiency and less severe membrane fouling compared to traditional MBR. Microbial analysis revealed the enrichment of fouling-eased group bacteria in carrier-enhanced ASSR, leading to the alleviation of membrane fouling.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Environmental Sciences
Sergi Vinardell, Lucie Sanchez, Sergi Astals, Joan Mata-Alvarez, Joan Dosta, Marc Heran, Geoffroy Lesage
Summary: This research investigates the impact of permeate flux and gas sparging rate on membrane permeability, organic matter rejection, and process economics of granular anaerobic membrane bioreactors (AnMBRs). The results showed that flux and sparging rate had a direct impact on membrane fouling, but did not affect the rejection of organic matter. The analysis suggests that protein-like fluorophores could be important foulants for these systems. The economic analysis highlights the importance of reducing sparging rate requirements and improving membrane permeability to reduce costs.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Anwar Khursheed, Faris Mohammad A. Munshi, Abdulaziz Ibrahim Almohana, Abdulrhman Fahmi Alali, Mohab Amin Kamal, Shamshad Alam, Omar Alrehaili, Dar Tafazul Islam, Manish Kumar, Sunita Varjani, A. A. Kazmi, Vinay Kumar Tyagi
Summary: The reappearance of assimilated nitrogen and phosphorus in any biological process is a challenge to nutrient removal. A novel reactor configuration combining an anaerobic reactor and Anaerobic-Anoxic-Aerobic (A2O) SBR was tested for enhanced sludge and phosphorus removal. The reactor operated at low SRT for phosphorus assimilative uptake and resulted in a significant increase in phosphorus enrichment. However, the sludge reduction also occurred during the process. The success of the configuration lies in reconciling conflicting parameters of enhanced phosphorus uptake and sludge growth.
Review
Environmental Sciences
Anna Christine Trego, Simon Mills, Gavin Collins
Summary: Anaerobic digestion is recognized as a sustainable method for waste management, producing methane-rich biogas. Different specialized granules, including anaerobic and aerobic granules, have opened up new opportunities in wastewater treatment and resource recovery biotechnology. Each type of granule has unique characteristics, biochemical processes, and microbial community compositions.
CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2021)
Review
Environmental Sciences
Amr Mustafa Abdelrahman, Hale Ozgun, Recep Kaan Dereli, Onur Isik, Onur Yilmaz Ozcan, Jules B. van Lier, Izzet Ozturk, Mustafa Evren Ersahin
Summary: Anaerobic membrane bioreactor (AnMBR) technology offers a promising solution for high solids concentration streams treatment, with increased digestion efficiency and enhanced effluent quality, leading to potentially lower costs and higher energy production. However, membrane fouling remains a challenge that requires further research for improvement.
CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Chemical
Huihui Zhou, Defeng Xing, Jun Ma, Yanyan Su, Yifeng Zhang
Summary: Bioelectrochemical anaerobic digestion (BEAD) is an attractive method for enhancing biogas production. This study explores the use of intact anaerobic granular sludge (AGS) as a biocatalyst for efficient methane production. The BEAD system was optimized by controlling the applied voltage and acetate load, and the AGS-based system showed promising results for degrading highly concentrated organic waste. The microbial communities at the anode and cathode were also analyzed.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Chemical
Hongbo Feng, Honggang Yang, Jianlong Sheng, Zengrui Pan, Jun Li
Summary: The use of a spiny aeration device in an SBR was effective in reducing the size of aerobic granular sludge particles when treating tannery wastewater. Despite the smaller sludge granules produced, there was no significant difference in MLSS, SVI, COD and NH4+-N removal between the conventional SBR and the SBR with the spiny aeration device. Further analysis showed a decrease in Proteobacteria proportion in the latter, along with less accumulation of Fe and Ca in smaller granules.
Review
Engineering, Environmental
Zhiwei Wang, Keyang Jiang, Yunpeng Zhu, Ling Liu, Xuelian Zou, Xiao Yang, Yihu Xu, Jian Zhang, Yubao Chen, Wenhua Gao, Shuangfei Wang
Summary: During the anaerobic treatment of high-calcium organic wastewater, the formation of calcium carbonate or calcium phosphate precipitates on the biofilm surface affects the mass transfer and microbial breeding space of anaerobic granular sludge (AnGS), resulting in biomass reduction and decreased AnGS activity. This study analyzed the mechanisms of AnGS calcification and the migration of calcium precipitation into the interior of AnGS. Traditional methods for controlling calcification and removing calcified AnGS are costly and ineffective. A new approach for resolving AnGS calcification is proposed by optimizing flora and improving sludge activity.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Engineering, Chemical
Cebisa Thabo Mdladla, Phumeza Akhona Dyosile, Mahomet Njoya, Moses Basitere, Seteno Karabo Obed Ntwampe, Ephraim Kaskote
Summary: The study improved the treatment efficiency of PSW by pre-treating it with a biological mixture and further treating it in an EGSB, resulting in increased removal rates of FOG, tCOD, and TSS. This process is designed for micro, small, and medium poultry slaughterhouses.
Article
Engineering, Environmental
Hao Huang, Yang-fan Deng, Qian Zeng, Philippe M. Heynderickx, Guanghao Chen, Di Wu
Summary: This paper studied a new method that integrates electrochemical pretreatment (EPT) and sulfidogenesis-enhanced anaerobic treatment with a conventional oxic-settling anaerobic (OSA) process to achieve considerable in-situ sludge reduction. The experimental results showed that the new process can successfully reduce sludge production and has high removal efficiencies of COD and TN.
CHEMICAL ENGINEERING JOURNAL
(2022)