Article
Agricultural Engineering
Lijun Luo, Saranya Sriram, Davidraj Johnravindar, Thomas Louis Philippe Martin, Jonathan W. C. Wong, Nirakar Pradhan
Summary: This study systematically evaluated and compared different inoculum pretreatment methods to quickly select dark fermentative bacteria from anaerobic sludge for the bioconversion of food waste. The results showed that the treatment methods of heat and alkali produced the highest hydrogen production rate and yield. Analysis of organic acids and microbial data revealed the presence of acetate and butyrate as major by-products, with Firmicutes, Bacteroidota, and Proteobacteria as the dominant phyla.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Zhenjun Tian, Guowen Li, Ying Xiong, Xiaoxin Cao, Hongtao Pang, Wenzhong Tang, Yongli Liu, Miaoxin Bai, Qiuheng Zhu, Caili Du, Maotong Li, Lieyu Zhang
Summary: In this study, food waste fermentation liquid (FWFL) was step-fed into a bench-scale step-feed three-stage anoxic/aerobic system (SFTS-A/O) to investigate its performance in nutrients removal and microbial community response. The results showed that TN removal rate increased significantly after step-feeding FWFL, and the biomass of the system also increased. Proteobacteria was found to be the dominant functional phyla induced by FWFL, and the increase of its abundance was responsible for the biomass increase. Metagenomics analysis revealed that step-feeding FWFL enhanced the abundance of denitrification and carbohydrates-metabolism genes, mainly encoded by Proteobacteria.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Engineering, Environmental
Boyi Cheng, Yayi Wang, Da Zhang, Di Wu, Feixiang Zan, Jie Ma, Lei Miao, Zongping Wang, Guanghao Chen, Gang Guo
Summary: A new strategy based on thiosulfate pretreatment was proposed to enhance short-chain fatty acids (SCFAs) production during anaerobic fermentation (AF) of waste activated sludge (WAS). The addition of thiosulfate significantly improved the disintegration of WAS, leading to increased SCFA yield. This was achieved through the binding of thiosulfate to organic-binding cations, dispersing the extracellular polymeric substance (EPS) structure and causing cell lysis. The enzyme activities and gene abundances showed enhanced hydrolysis and acidogenesis, while methanogenesis was suppressed. This cost-effective and efficient strategy provides a new approach for resource recovery through thiosulfate-assisted WAS AF.
Article
Agricultural Engineering
Qiao Wang, Luxin Yang, Kai Feng, Huan Li, Zhou Deng, Jianguo Liu
Summary: This study found that adding laboratorial biogas slurry or industrial biogas slurry can significantly promote the production of lactic acid from food waste fermentation, especially carbohydrates. Industrial biogas slurry performed better due to higher pH, more diverse microbial community, and more functional microorganisms. The optimal ratio of additive to feedstock is 0.2, achieving the highest lactic acid yield.
BIORESOURCE TECHNOLOGY
(2021)
Article
Agricultural Engineering
Zihan Zhu, Yanyan Guo, Youcai Zhao, Ruina Zhang, Yi Yu, Meilan Zhang, Tao Zhou
Summary: The fermentation of perishable organic waste improved the removal efficiency of organics and nitrogen in sewage, with the obtained liquid serving as a cost-efficient carbon source for denitrification.
BIORESOURCE TECHNOLOGY
(2021)
Article
Agricultural Engineering
Zhengui Shi, Liang Zhang, Hairong Yuan, Xiujin Li, Yanqing Chang, Xiaoyu Zuo
Summary: The study found that adding an appropriate amount of oyster shells can improve H2 production rate, cumulative H2 production, promote buffering capacity, and enhance TVFAs production.
BIORESOURCE TECHNOLOGY
(2021)
Article
Environmental Sciences
Xihong Chen, Rui Tang, Shasha Qi, A. Rong, Ibrahim Mohamed Ali, Haiping Luo, Wei Wang, Zhen-Hu Hu
Summary: This study indicates that the presence of lipids in FWFL used as a carbon source for denitrification can inhibit the denitrification process, mainly due to sludge floatation and limited gas release caused by lipids. Therefore, it is necessary to remove fats when using FWFL as a carbon source.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Agricultural Engineering
Qingshan Lin, Xinlei Dong, Jinming Luo, Qian Zeng, Jie Ma, Zongping Wang, Guanghao Chen, Gang Guo
Summary: This study investigated an alternative electrochemical pretreatment approach that facilitated acidogenic fermentation of waste activated sludge and food waste, resulting in enhanced production of volatile fatty acids.
BIORESOURCE TECHNOLOGY
(2022)
Article
Agricultural Engineering
Lijun Luo, Nirakar Pradhan
Summary: This study evaluated the combined impact of salinity and inoculum pretreatment on hydrogen production from food waste. The results showed that acid-treated inoculum had the highest H-2 yield under medium salinity levels. Genomic analysis and metabolic pattern revealed different fermentation types under different salinity levels. This study demonstrated the significance of inoculum pretreatment for the bioconversion of food waste.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Luxin Yang, Liang Chen, Chuyun Zhao, Huan Li, Jiabai Cai, Zhou Deng, Mengqian Liu
Summary: Regularly adding biogas slurry into fermentation reactors can enhance the production of hydrogen or methane, but its effects on the production of organic acids and alcohols are still under investigation. This study examined the effects of different addition ratios in semi-continuous fermentation reactors using food waste as a substrate. The results showed that adding biogas slurry increased lactic acid production and changed the dominant fermentation products. The introduction of Bifidobacteriaceae increased lactic acid production, while exclusive medium-chain fatty acid producers enhanced the synthesis of caproic acid and heptanoic acid.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Agricultural Engineering
Shuo Liu, Qunhui Wang, Yuan Li, Wenbin Zhu, Nuohan Wang, Haishu Sun, Ming Gao, Xiaoyu Ma
Summary: The valorization of organic solid waste to lactic acid (LA) in open fermentation systems has gained significant attention recently. In this study, a highly efficient oriented LA bioconversion system from food waste (FW) in open mode was established. The maximum LA production was 115 g/L, with a high yield of 0.97 g-LA/g-total sugar. The oriented LA bioconversion exhibited the capacity for biological carbon fixation by reducing CO2 emissions by at least 21 kg per ton of FW under anaerobic conditions.
BIORESOURCE TECHNOLOGY
(2023)
Article
Food Science & Technology
Zheng Wang, Xueao Ji, Shilei Wang, Qun Wu, Yan Xu
Summary: This study investigated the regulation of sugar profile on microbial diversity and metabolism in Chinese Baijiu fermentation using sorghum as raw material. Glucose, fructose, and arabinose were identified as key sugars driving microbial and metabolic diversity during fermentation. The metabolic diversity significantly increased with optimized levels of these sugars, providing a strategy to control microbial metabolism and improve the quality of fermented foods.
INTERNATIONAL JOURNAL OF FOOD MICROBIOLOGY
(2021)
Article
Environmental Sciences
Zhen Gao, Yingqun Ma, Yu Liu, Qunhui Wang
Summary: This study developed a co-fermentation strategy using waste cooking oil (WCO) and food waste for microbial lipid production. It was found that adjusting the pH values within a certain range could increase lipid production efficiency. The produced lipid could potentially be used for biodiesel production, leading to significant reductions in CO2 and SO2 emissions from global food waste.
ENVIRONMENTAL RESEARCH
(2022)
Review
Agronomy
Tomasz Szymczak, Justyna Cybulska, Marcin Podlesny, Magdalena Frac
Summary: Lipases are enzymes with versatile applications that are widely used in biotechnology and organic chemistry. Microbial lipases are more stable and cost-effective compared to other sources. Challenges remain in producing microbial lipases with renewable sources, but submerged fermentation and solid-state fermentation are important technologies for their production.
Article
Agricultural Engineering
Jiawei Li, Dongbo Ma, Jiahui Tian, Tongyu Sun, Qingwei Meng, Jianping Li, Anshan Shan
Summary: The study investigated the effects of glucose, fructose, sucrose, and molasses on the anaerobic fermentation of Chinese cabbage waste. Fructose and molasses additions significantly increased lactic acid production, acetic acid production, ammonia nitrogen formation, and reduced neutral detergent fiber level. Glucose and sucrose additions had limited effects on organic acid production. Additionally, carbon source additions enriched acid-producing bacteria, upregulated carbohydrate and lipid metabolism pathways, and reduced the abundances of specific bacteria. Overall, fructose and molasses additions enhanced the recycling of Chinese cabbage waste into organic acids.
BIORESOURCE TECHNOLOGY
(2023)
Article
Agricultural Engineering
Jialing Tang, Yunhui Pu, Ting Zeng, Yisong Hu, Jin Huang, Shengwang Pan, Xiaochang C. Wang, Yuyou Li, Abd El-Fatah Abomohra
Summary: The study introduced a new method for enhanced biomethane production and pollution control of swine wastewater using an anaerobic membrane bioreactor. The optimal temperature for enhanced anaerobic digestion was confirmed to be 35 degrees Celsius. The AnMBR system achieved robust pollutants removal and conversion rate at various hydraulic retention times, with the highest methane yield recorded at 15 days.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Yunhui Pu, Jialing Tang, Ting Zeng, Yisong Hu, Jixiang Yang, Xiaochang Wang, Jin Huang, Abdelfatah Abomohra
Summary: This study introduces an efficient technology, anaerobic membrane bioreactor (AnMBR), for treating swine wastewater. Compared to the traditional up-flow anaerobic sludge blanket (UASB) system, AnMBR achieved higher chemical oxygen demand (COD) removal rate and methane yield, and promoted the organic matter conversion processes. In addition, the net energy recovery efficiency of AnMBR was also higher than that of UASB system.
Article
Agricultural Engineering
Ziang He, Yuanyuan Ren, Jianyong Liu, Yu-You Li
Summary: The co-digestion performance of mesophilic hollow fiber anaerobic membrane bioreactor (HF-AnMBR) treating high-solid lipids and food waste was studied for 180 days. The organic loading rate (OLR) was increased from 2.33 to 14.64 g-COD/L/d by increasing the lipids/FW ratio. The HF-AnMBR showed stable performance in terms of COD conversion efficiency, sludge growth rate, and concentrations of COD, proteins, and carbohydrates in permeate.
BIORESOURCE TECHNOLOGY
(2023)
Article
Agricultural Engineering
Min Ye, Qian Li, Yu-You Li
Summary: The study evaluated a high-rate anaerobic membrane bioreactor (AnMBR) for treating dairy processing wastewater (DPW). The AnMBR system exhibited superior performance in terms of methanogenic efficiency and bioenergy recovery, with a high net energy potential of 51.4-53.2 kWh/m3. The application of AnMBR led to a significant reduction of 54.1 kg CO2-eq/m3 compared to the conventional process, making it a promising approach for carbon neutrality and a circular economy.
BIORESOURCE TECHNOLOGY
(2023)
Article
Green & Sustainable Science & Technology
Liang Zhang, Zhe Tian, Yunzhi Qian, Fuqiang Chen, Yu -You Li, Xueke Wang, Cuilian Fu, Yongzhi Chi
Summary: The long-term treatment of phosphorus-deficient wastewater using a one-stage partial nitrification-anammox (PNA) process may have negative effects on the growth of functional bacteria. A 650-day experiment was conducted using a lab-scale PNA system to study the impact of long-term phosphorus deficiency on nitrogen removal efficiency and sludge characteristics. It was found that phosphorus deficiency led to a decrease in nitrogen removal efficiency, high sludge volume index, and sludge bulking. The abundance of hzsA in flocs decreased significantly. However, the biofilm showed better resistance to phosphorus deficiency. After the addition of PO43--P, the nitrogen removal rate improved, and sludge bulking disappeared.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Environmental Sciences
Jinghuan Luo, Li Jiang, Yuanyuan Wei, Yanmei Li, Guiyu Yang, Yu-You Li, Jianyong Liu
Summary: Alkaline anaerobic fermentation (AAF) coupled with EDTA addition was used to treat metal and EPSs-rich waste activated sludge (WAS). The addition of EDTA significantly promoted sludge solubilization and SCFAs production by chelating metals and destroying EPSs. This study provides an effective method for recovering carbon source from metal and EPSs-rich WAS.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Engineering, Chemical
Wanni Zhang, Wenchao Xue, Kang Xiao, Chettiyappan Visvanathan, Jialing Tang, Lu Li
Summary: Flow-electrode capacitive deionization (FCDI) is an emerging desalination technology that offers high desalination efficiency and continuous operation. This study investigated the feasibility of different carbon-based materials as flow-electrodes in FCDI, focusing on their desalination efficiency and energy efficiency. The nano-scale materials, such as multi-walled carbon nanotubes (MWCNTs) and graphene nanoplatelets (GNPs), outperformed the micron-scale materials. Combinations of activated carbon (AC) with MWCNTs or GNPs showed superior desalination performance compared to combinations with carbon black (CB). The use of GNPs as a flow-electrode improved stability, conductivity, and salt adsorption rate in FCDI.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Agricultural Engineering
Jialing Ni, Jiayuan Ji, Yu-You Li, Kengo Kubota
Summary: An anaerobic membrane bioreactor (AnMBR) was used to treat domestic sewage at 15 degrees C under different hydraulic retention time (HRT) conditions (6, 12, 16, and 24 h). The viability of microbial community in anaerobic digestion was assessed using Propidium monoazide (PMA)-PCR, which targeted microorganisms with intact cell membranes. The study found that a 6-hour HRT resulted in poor treatment performance, with low chemical oxygen demand removal efficiency and high mean trans-membrane pressure and flux. PMA-PCR combined with next-generation sequencing provided better identification of microbial changes compared to conventional 16S rRNA gene sequencing.
BIORESOURCE TECHNOLOGY
(2023)
Article
Agricultural Engineering
Chihao Lin, Yanxu Liu, Yu-You Li, Jianyong Liu
Summary: This study proposes high-salinity treatment as a novel strategy for inactivating nitrite-oxidising bacteria (NOB) and achieving stable partial nitritation (PN). The study found that NOB are more sensitive to high salinity than ammonia-oxidising bacteria (AOB), and increasing salinity inhibited nitrification. After high-salinity treatment, nitrite accumulation rate (NAR) was above 33% during nitrification. A novel process for achieving mainstream PN was proposed and evaluated based on the results.
BIORESOURCE TECHNOLOGY
(2023)
Article
Agricultural Engineering
Yunzhi Qian, Shilong He, Fuqiang Chen, Junhao Shen, Yan Guo, Yu Qin, Yu-You Li
Summary: This study evaluated the functional activity and microbial structure of a pre-denitrification and single-stage partial nitritation/anammox process (DB-SNAP) coupled system for effectively treating swine manure digestate (SMD). The results showed that the pre-denitrification reactor increased the nitrogen removal efficiency (NRE) by 5%, resulting in an average NRE of 96%. The DB-SNAP and nitrogen-limited strategy facilitated the rapid adoption of anammox bacteria (AnAOB) in the SMD.
BIORESOURCE TECHNOLOGY
(2023)
Article
Agricultural Engineering
Jialing Tang, Hao Yang, Yunhui Pu, Yisong Hu, Jin Huang, Ni Jin, Xinrui He, Xiaochang C. Wang
Summary: Caproic acid (CA) production from food waste (FW) is a promising way for waste recycling. In this study, the fermentation process of FW acidogenic fermentation under different pH conditions was explored. The results showed that substrate hydrolysis, carbohydrate degradation, and acidogenesis increased with the increase of pH. Lactic acid bacteria were enriched at lower pH, leading to the accumulation of lactic acid. At pH 6, CA was produced through lactate-based chain elongation processes. This study provides a new pathway for CA fermentation and enriches the valorization of FW.
BIORESOURCE TECHNOLOGY
(2023)
Article
Agricultural Engineering
Mengni Tao, Yu Kong, Zhaoqian Jing, Lin Guan, Qiusheng Jia, Yiwei Shen, Meijia Hu, Yu -You Li
Summary: Acorus calamus is recycled as an additional carbon source in microbial fuel cell-constructed wetlands for efficient nitrogen removal of low carbon wastewater. Alkali-pretreatment cleaves the benzene rings in dominant released organics, producing chemical oxygen demand of 164.5 mg per gram of A. calamus. Adding pretreated biomass in the anode of MFC-CW achieves maximum total nitrogen removal of 97.6% and power generation of 12.5 mW/m2.
BIORESOURCE TECHNOLOGY
(2023)
Article
Agricultural Engineering
Jiayuan Deng, Xiangmin Xiao, Yu-You Li, Jianyong Liu
Summary: This study used the innovative low-carbon nitrogen removal process of partial denitrification-anammox (PD-A) to simultaneously treat PPCCW and municipal wastewater pre-treated with 10 mg/L Fe3+. The results showed that the effluent had a total nitrogen concentration lower than 10 mg/L, with a removal efficiency of 79.67 +/- 3.48%. The dominant anammox genus was unclassified_f_Brocadiaceae, indicating the stability of the reactor. Hydrolytic acidifying bacteria SBR1031 and Bacillus increased substantially after feeding with actual wastewater, leading to increased removal efficiencies of organic material and nitrogen, suggesting a synergistic effect with PD-A bacteria. Finally, a novel wastewater treatment process that fully recovers carbon, phosphorus, and water was proposed.
BIORESOURCE TECHNOLOGY
(2023)
Article
Environmental Sciences
Jialing Tang, Hao Yang, Yunhui Pu, Yisong Hu, Xiangjiang Qu, Si Chen, Xiaochang C. Wang, Huu Hao Ngo, Yuyou Li, Abdelfatah Abomohra
Summary: This study introduces anaerobic dynamic membrane bioreactor (AnDMBR) to enhance methane production in swine wastewater treatment, and cultivates microalgae on the digestate for nutrient recovery and lipid production. Results show effective removal of pollutants under different hydraulic retention time (HRT) conditions. Microalgae cultivation leads to successful removal of ammonia and phosphate in the digestate. The integration of AnDMBR technology with microalgae cultivation provides a promising pathway for pollutants control and energy production from swine wastewater.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Jialing Tang, Xiangjiang Qu, Si Chen, Yunhui Pu, Xinrui He, Zhihui Zhou, Huijun Wang, Ni Jin, Jin Huang, Faisal Shah, Yisong Hu, Abdelfatah Abomohra
Summary: Microalgae cultivation using wastewater as a combined process for pollutant removal and lipid production was studied. The effects of anaerobic membrane effluent (AME) and municipal wastewater (MW) ratios on microalgae growth and pollutant removal processes were investigated. The optimal condition for microalgal biomass accumulation and lipid production was found to be a 40% AME content.
