Article
Engineering, Environmental
Changtao Chen, Tao Zhang, Li Lv, Yanxiao Chen, Wenxiang Tang, Shengwei Tang
Summary: The use of ionic liquid [EMIM][OTf] as a conditioner significantly improves the dewatering performance of waste activated sludge (WAS) by reducing moisture content. The mechanism involves the destruction of EPS structures, inactivation of microbial cells, and conversion of large flocs into small particles and biopolymers. Additionally, the negative charges of WAS are neutralized, weakening electrostatic repulsion between flocs, and [EMIM][OTf] can be recycled multiple times.
Article
Environmental Sciences
Yalin Li, Lei Liu, Xiaoran Li, Junpu Xie, Mingyue Guan, Enci Wang, Dongxue Lu, Tingting Dong, Xing Zhang
Summary: In this study, a self-prepared experimental device made of plexiglass was used to investigate the deep dewatering of municipal dewatered sludge. The factors affecting the enhanced electric settlement of sludge, such as the exchange electrode method, voltage gradient, sludge thickness, and mechanical pressure, were studied. The results elucidated the dewatering mechanism and showed that reducing proteins/polysaccharides and deconstructing tightly bound extracellular polymeric substances (TB-EPSs) can improve the sludge dewatering effect.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Yusong Zhang, Bingdi Cao, Ruijun Ren, Yu Shi, Jiaqing Xiong, Weijun Zhang, Dongsheng Wang
Summary: The distribution and composition of EPS in sludge have a significant impact on the efficiency of sludge ED, where high concentrations of certain EPS components can decrease ED rates and affect protein secondary structure, ultimately impacting water-holding capacity and ED performance.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Review
Engineering, Environmental
Bingdi Cao, Tao Zhang, Weijun Zhang, Dongsheng Wang
Summary: Sludge is a byproduct of sewage treatment containing pathogens, heavy metals, organic pollutants and other toxic substances. Chemical preconditioning is crucial for improving sludge dewatering efficiency, and different chemical conditioning technologies have a significant impact on the dewatering process. Research and evaluation of various enhanced dewatering technologies are important for improving dewatering efficiency.
Article
Agricultural Engineering
Pengfei Wan, Ying Liu, Quandi Zhang, Li Jiang, Heping Chen, Wenzhou Lv
Summary: Candida Tropicalis was used to improve the dewaterability of activated sludge (AS) by degrading EPS in AS, resulting in a decrease in protein, polysaccharide, and hydrophilic amino acids in EPS. The yeast degraded macromolecular organics into smaller molecular ones and direct addition of yeast to AS was more effective in EPS degradation. Addition of 0.75 g/L of wet yeast cells and 24 h of aeration enhanced the dewaterability of AS with a reduction in CST and MLSS. After 30 days of operation, lab-scale continuous SBRs reduced CST and MLSS of AS. FTIR spectroscopy showed a decrease in hydrophilic functional groups. This study presents a new approach for in-situ reduction of AS in wastewater treatment plants.
BIORESOURCE TECHNOLOGY
(2023)
Article
Environmental Sciences
Ling-Yu Wang, Xue Li, Kun Luo, Yu-Hao Song, Ren-Guo Liu
Summary: In this study, CPAM-modified diatomite and CTAB-modified diatomite were synthesized and used as conditioners for sewage sludge dewatering. The efficiency of CPAM-modified diatomite was found to be better than CTAB-modified diatomite in improving sludge settleability and dewaterability. The adsorption of polymers/surfactants in diatomite increased sludge dewaterability and improved sedimentation rate by damaging the internal structure of the sludge and promoting the release of bound water.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Yun bei Li, Jun li Song, Qian jing Yao, Ze xu Chen, Yi Wei, Hai long Li, Meng xiao Wang, Bing jing Wang, Jia min Zhou
Summary: Increasing dissolved oxygen concentration can enhance bioleaching efficiency, improve sludge dewatering performance, and facilitate the removal of heavy metals. Additionally, the degradation of EPS and sludge floc fragmentation play vital roles in the bioleaching process.
Article
Environmental Sciences
An Ding, Wei Lin, Renglu Chen, Huu Hao Ngo, Rourou Zhang, Xu He, Jun Nan, Guibai Li, Jun Ma
Summary: This study combines energy uncoupling and chemical re-flocculation to accelerate residual sludge dewatering. The application of TCS in flocculation conditioning altered the distribution of sludge EPS, leading to the formation of fragmented sludge flocs and enhanced dewaterability.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Shaodong Guo, Yuxin Huang, Long Zhou, Xinghu Huang
Summary: The study utilized electrolysis zero-valent iron activated peroxymonosulfate (EZVI-PMS) to enhance sludge dewaterability and disintegration performance, revealing significant reduction in sludge CST and SRF, as well as DNA release from sludge cells. The transformation of EPS, protein, and polysaccharides in sludge was observed, indicating a conditioning mechanism where TB-EPS converted to SB-EPS with noticeable changes in DOC and protein content.
WATER SCIENCE AND TECHNOLOGY
(2021)
Article
Environmental Sciences
Lixin Li, Cheng Peng, Lihua Deng, Fugui Zhang, Dan Wu, Fang Ma, Yan Liu
Summary: PAM-FeCl3 conditioning can enhance sludge dewaterability by neutralizing the negative charges on sludge particles, increasing sludge floc size, and forming a rough and porous floc structure. This process also effectively disintegrates EPS fractions, decomposes aromatic protein-like substances, and improves sludge dewatering performance.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Xuejie He, Lei He, Ziyuan Lin, Jiong Zhou, Shuohui Shi, Yi Liu, Jian Zhou
Summary: This study developed a sludge composite conditioner (SCC) to significantly improve the dewaterability of high-organic sludge, achieved by promoting dissolution of extracellular polymeric substances, enhancing decomposition of sludge flocs, and increasing sludge particle size.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Dongqin He, Mingkai Sun, Bo Bao, Jingyi Chen, Hongwei Luo, Jun Li
Summary: The combined use of acid and flocculant can effectively enhance sludge dewatering performance. Results showed that dosing PDMDAAC before acid treatment leads to better dewatering capability, reducing water content. The potential mechanisms behind enhanced dewatering performance include the decomposition of tightly-bound extracellular polymeric substances, increased particle size, and changes in sludge floc morphology.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Engineering, Environmental
Xiaoying Liu, Jie Liu, Dongkun Deng, Renjie Li, Chao Guo, Jinxia Ma, Ming Chen
Summary: The study revealed a positive correlation between EPS content and sludge granulation, with increased protein concentration facilitating microbial aggregation and sludge granulation. Environmental factors affect the properties of EPS, with different types of sludge generating varying levels of EPS and protein concentrations.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Engineering, Environmental
Xiaoping Liu, Yunbo Zhai, Zhixiang Xu, Liming Liu, Wanying Ren, Yu Xie, Caiting Li, Yun Zhu, Min Xu
Summary: The high water content of sewage sludge increases processing costs and hampers disposal. Cu+ and Cu+/H2O2 pretreatments without extra pH adjustment were proposed to enhance sludge dewaterability. Cu3+ plays an important role in sludge dewatering, releasing bound water and improving dewaterability.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Junsen Wang, Tianrun Wang, Zonglin Li, Bomin Fu, Yuhui Zhai, Weijie Wang, Mudi Zhai, Jean-Marc Chovelon, Yuxiu Gong, Hongtao Wang
Summary: In this study, an advanced oxidation process using electrolysis coupled with peroxymonosulfate (E/PMS) was used to improve the dewaterability of waste activated sludge (WAS). The results showed that the E/PMS process significantly reduced the water content and capillary suction time of the sludge, indicating improved dewaterability. The generation of reactive oxygen species in the process damaged the extracellular polymeric substances (EPS) and reduced the viscosity of the sludge, leading to a decrease in sludge volume and improved disposal efficiency. Additionally, the E/PMS treatment also enhanced the degradation of organic matter and reduced the toxicity and bioavailability of heavy metals in the sludge.
Article
Agricultural Engineering
Yinping Xiang, Meiying Jia, Rui Xu, Jialu Xu, Lele He, Haihao Peng, Weimin Sun, Dongbo Wang, Weiping Xiong, Zhaohui Yang
Summary: This study investigated the impact of the non-antibiotic pharmaceutical carbamazepine on antibiotic resistance genes (ARGs) during anaerobic digestion. The results showed that carbamazepine induced the enrichment of ARGs and increased the abundance of bacteria carrying these genes. It also facilitated microbial aggregation and intercellular communication, leading to an increased frequency of ARGs transmission. Moreover, carbamazepine promoted the acquisition of ARGs by pathogens and elevated their overall abundance.
BIORESOURCE TECHNOLOGY
(2024)
Review
Agricultural Engineering
Weixin Zhao, Tianyi Hu, Hao Ma, Dan Li, Qingliang Zhao, Junqiu Jiang, Liangliang Wei
Summary: This review summarizes the effects and potential mechanisms of biochar on microbial behavior in AD systems. The addition of biochar has been found to promote microbial colonization, alleviate stress, provide nutrients, and enhance enzyme activity. Future research directions include targeted design of biochar, in-depth study of microbial mechanisms, and improved models.
BIORESOURCE TECHNOLOGY
(2024)
Review
Agricultural Engineering
Christina Karmann, Anna Magrova, Pavel Jenicek, Jan Bartacek, Vojtech Kouba
Summary: This review assesses nitrogen removal technologies in reject water treatment, highlighting the differences in environmental impacts and economic benefits. Partial nitritation-anammox shows potential for economic benefits and positive environmental outcomes when operated and controlled properly.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Wei-Hao Huang, Ying-Ju Chang, Duu-Jong Lee
Summary: This study modified pinecone biochar with layered double hydroxide (LDH) to enhance its adsorption capacity for heavy metal and phosphate ions. The LDH-biochar showed significantly improved adsorption capacities for Pb2+ and phosphate, and a slight increase for Cu2+ and Co2+. The LDH layer enhanced the adsorption through various mechanisms.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Chao Song, Fanfan Cai, Shuang Yang, Ligong Wang, Guangqing Liu, Chang Chen
Summary: This paper developed a machine learning model to predict the biochemical methane potential during anaerobic digestion. Model analysis identified lignin content, organic loading, and nitrogen content as key attributes for methane production prediction. For feedstocks with high cellulose content, early methane production is lower but can be improved by prolonging digestion time. Moreover, lignin content exceeding a certain value significantly inhibits methane production.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Sang Min Lee, Ju Young Lee, Ji-Sook Hahn, Seung-Ho Baek
Summary: This study successfully developed an efficient platform strain using Yarrowia lipolytica for the bioconversion of renewable resources into adipic acid, achieving a remarkable increase in production level.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Sefkan Kendir, Matthias Franzreb
Summary: This study presents a novel approach using magnetic separation to efficiently harvest freshwater microalgae, Chlorella vulgaris. By combining pH-induced calcium phosphate precipitation with cheap natural magnetite microparticles, harvesting efficiencies up to 98% were achieved in the model medium.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Ishaq Kariim, Ji-Yeon Park, Wajahat Waheed Kazmi, Hulda Swai, In-Gu Lee, Thomas Kivevele
Summary: The impact of reaction temperature, residence time, and ethanol: acetone on the energy compositions and yield enhancement of biocrudes was investigated. The results showed that under appropriate conditions, biocrudes with high energy and low oxygen content can be obtained, indicating a high potential for utilization.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Xiyue Zhang, Xiyao Li, Liang Zhang, Yongzhen Peng
Summary: Intermittent aeration is an innovative approach to enhance nitrogen removal in low carbon-to-nitrogen ratio municipal sewage, providing an efficient strategy for the continuous plug-flow AOA process.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Xu Yang, Mahmoud Mazarji, Mengtong Li, Aohua Li, Ronghua Li, Zengqiang Zhang, Junting Pan
Summary: This study investigated the impact of magnetite on the nitrogen cycle of pig manure biostabilisation. The addition of magnetite increased N2O emissions and decreased NH3 emissions during composting. It also increased the total nitrogen content but should be considered for its significant increase in N2O emissions in engineering practice.
BIORESOURCE TECHNOLOGY
(2024)
Review
Agricultural Engineering
Ty Shitanaka, Haylee Fujioka, Muzammil Khan, Manpreet Kaur, Zhi-Yan Du, Samir Kumar Khanal
Summary: The market value of microalgae has exponentially increased in the past two decades, thanks to their applications in various industries. However, the supply of high-value microalgal bioproducts is limited due to several factors, and strategies are being explored to overcome these limitations and improve microalgae production, thus increasing the availability of algal-derived bioproducts in the market.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Martin Kerner, Thorsten Wolff, Torsten Brinkmann
Summary: The efficiency of using enriched CO2 from flue gas for large-scale production of green microalgae has been studied. The results show that the use of membrane devices and static mixers can effectively improve the CO2 recovery rate and maintain the suitable pH and temperature during cultivation, achieving a more economical and sustainable microalgae production.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Rui Ma, Ji Li, Rd Tyagi, Xiaolei Zhang
Summary: This review summarizes the microorganisms capable of using CO2 and CH4 to produce PHAs, illustrating the production process, factors influencing it, and discussing optimization techniques. It identifies the challenges and future prospects for developing economically viable PHAs production using GHGs as a carbon source.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Bing Wang, Peng Zhang, Xu Guo, Xu Bao, Junjie Tian, Guomin Li, Jian Zhang
Summary: The addition of zeolite in the co-composting of chicken manure and straw significantly reduced the emissions of ammonia and N2O, and increased the nitrate content. Zeolite also promoted the abundance of nitrification genes and inhibited the expression of denitrification genes.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Rohit Dey, Franziska Ortiz Tena, Song Wang, Josef Martin Messmann, Christian Steinweg, Claudia Thomsen, Clemens Posten, Stefan Leu, Matthias S. Ullrich, Laurenz Thomsen
Summary: This study investigated the operation of a 1000L microalgae-based membrane photobioreactor system for continuous secondary wastewater treatment. The research focused on a green microalgae strain called Desmodesmus sp. The study aimed to understand key trends and optimization strategies by conducting experiments in both summer and winter seasons. The findings showed that maintaining low cell concentrations during periods of light inhibition was beneficial for nutrient uptake rates. Effective strategies for enhancing algae-based wastewater treatment included cell mass recycling and adjusting dilution rates based on light availability.
BIORESOURCE TECHNOLOGY
(2024)