Article
Environmental Sciences
Xinyue Lu, Wenjie Xu, Caixia Liu, Quanlin Zhao, Zhengfang Ye
Summary: EPS plays a significant role in nitrobenzene treatment, acting as both a reservoir for nitrobenzene and a protector of cells from toxicity. EPS helps maintain the stability of microbial communities by alleviating the negative impacts of nitrobenzene on inner cells.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2021)
Article
Environmental Sciences
Zhuoyao Chen, Zhenshan Huang, Haixu Liu, Huiying Wang, Zaishan Wei
Summary: This study evaluated the characteristics and heavy metal-binding ability of four EPS fractions extracted from denitrifying MBfR. The results showed that S, LB, and TB-EPS related to Pb stabilization on biofilm need more attention. Compared to Pb-S-EPS and Pb-LB-EPS, Pb-TB-EPS was found to be the main stable form of vapor Pb0 due to its higher content of proteins and polysaccharides. Proteins related ligands were more effective in the EPS-dependent adsorption of Pb, and the loose structure of proteins facilitated the formation of Pb-EPS complex.
Article
Environmental Sciences
Mengya Du, Lin Wang, Ali Ebrahimi, Guowei Chen, Shangyi Shu, Kun Zhu, Chongyang Shen, Baoguo Li, Gang Wang
Summary: This study investigates the impacts of EPS and sand collector size on bacterial transport in saturated porous media. Results show that decreasing sand collector size increases bacterial retention, while the presence of EPS reduces bacterial retention in sand columns. The study provides new insights into the role of EPS in bacterial transport behavior in saturated soil environments.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2021)
Article
Environmental Sciences
Chenchen Qu, Shanshan Yang, Monika Mortimer, Ming Zhang, Jinzhao Chen, Yichao Wu, Wenli Chen, Peng Cai, Qiaoyun Huang
Summary: Bacteria and their secreted EPS have the ability to immobilize heavy metals, and this study reveals the functional diversity and adsorption mechanisms of Pb onto bacteria and EPS in detail. The partitioning of Pb to functional groups differs between bacterial strains, EPS fractions, and Pb concentrations, and the adsorption occurs through a universal entropy increase and inner-sphere complexation mechanism.
ENVIRONMENTAL POLLUTION
(2022)
Article
Biochemistry & Molecular Biology
Yuhui Wu, Zhengyu Li, Yuesuo Yang, Diane Purchase, Ying Lu, Zhenxue Dai
Summary: The study shows that EPS has a good adsorption capacity for Cu2+ and Cd2+, promoting the migration of these heavy metals in subsurface porous media. Under the experimental conditions, EPS showed a greater affinity for Cu2+ than for Cd2+, and saturating the sand media can significantly enhance the migration of these metals.
Article
Green & Sustainable Science & Technology
Rongrong Hou, Peng Yang, Shengtao Qian, Rongfang Yuan, Zhongbing Chen, Beihai Zhou, Huilun Chen
Summary: This study investigated the mechanism of denitrifying phosphorus removal (DPR) using a well-running DPR system, and found that the increase of Poly-beta-hydroxyalkanoates (PHA) in the anaerobic stage was related to the utilization of proteins slime extracellular polymeric substances (S-EPS). Additionally, the concentrations of K+, Mg2+, and Ca2+ in EPS varied in different stratified EPS. These results provide insights into the mechanism of DPR from the perspective of intracellular carbon sources and EPS characteristics.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Environmental Sciences
Sonalin Rath, Krishna Palit, Surajit Das
Summary: This study investigates the impact of varying pH and pCO(2) on the survivability, biofilm formation, and synthesis of extracellular polymeric substances (EPS) in a biofilm-forming marine bacterium. The findings highlight the adaptability of the bacterium to different pH conditions, with the maximum biofilm formation and EPS synthesis observed at pH 6. Understanding the role of EPS in providing structural and functional stability in varying pH conditions is essential for comprehending the future effects of ocean acidification on marine bacteria.
ENVIRONMENTAL RESEARCH
(2022)
Article
Environmental Sciences
Wenjie Xu, Ziyi Yang, Hao Tang, Chen Wang, Zhengfang Ye
Summary: This study investigated the denitrification performance and compositional shift of extracellular polymeric substances (EPS) and microbial community in an immobilized anaerobic denitrifying bacterial consortium under tetracycline (TC) stress. High concentrations of TC inhibited the nitrate reduction ability of the bacterial consortium, with nitrite reduction being more sensitive to inhibition. The inhibitory effect was mainly due to TC damaging cell membranes and affecting intracellular enzymes activities. Approximately 50% of TC was removed by the bacterial consortium, with EPS playing an important role in TC removal. The denitrification performance of the consortium under TC stress was attributed to specific bacteria genera. The initial TC concentration significantly affected the microbial communities.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2022)
Article
Biochemistry & Molecular Biology
Mei Zhi, Yiying Zhao, Xinyu Zeng, Naga Raju Maddela, Yeyuan Xiao, Yucheng Chen, Ram Prasad, Zhongbo Zhou
Summary: This study investigated the composition of extracellular polymeric substances (EPS), microbial profiles, and functional genes of algae-bacteria aggregates in algae-bacteria symbiotic wastewater treatment. The results showed that solid retention times (SRTs) greatly influenced the nitrogen transformation and the formation and morphological structure of algae-bacteria aggregates. The study also revealed the importance of EPS structures and filamentous cyanobacteria in driving the aggregation of algae and bacteria.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Engineering, Chemical
Gen-Qiang Chen, Yin-Hu Wu, Zhuo Chen, Li-Wei Luo, Yun-Hong Wang, Xing Tong, Yuan Bai, Hao-Bin Wang, Yu-Qing Xu, Zi-Wei Zhang, Nozomu Ikuno, Hong-Ying Hu
Summary: Disinfection treatment increased the abundance of typical bacterial genus with high EPS production ability, leading to significantly enhanced EPS volumetric productivity. EPS produced by DRB showed higher fouling potential on UF and RO membranes, with increased molecular weight and fluorescence intensity. The XDLVO theory revealed that EPS of DRB had significantly higher interaction energy with membranes than control group, indicating caution should be taken when using oxidizing disinfection as pre-treatment for membrane filtration in wastewater reclamation.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Green & Sustainable Science & Technology
Shanshan Pi, Ang Li, Jiguo Qiu, Liang Feng, Lu Zhou, He-Ping Zhao, Fang Ma
Summary: The bioengineering method enhanced chromium recovery by increasing polysaccharide content in EPSs, which played a crucial role in chelating with Cr(VI) and reducing it to Cr(III). This approach offers a simple, effective, and sustainable way to preserve chromium resources.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Environmental
Hong Yin, Haibo Wang, Min Wang, Baoyou Shi
Summary: There is an increasing concern about the impact of micropollutants on biofilm formation and antibiotic resistance gene transmission in drinking water distribution pipes. However, little is known about the influence of the interaction between extracellular polymeric substances (EPS) and corrosion products on biofilm formation. The study found that the interaction between EPS and corrosion products in cast iron pipes led to the formation of more pathogenic bacteria carrying antibiotic resistance genes (ARGs) in biofilms. On the other hand, the interaction between EPS and corrosion products in stainless steel pipes resulted in the formation of more bacteria carrying mobile genetic elements (MGE) ARGs due to the higher abundance of genes related to quorum sensing and amino acid biosynthesis in EPS.
Article
Green & Sustainable Science & Technology
Shu Wang, Nanqi Ren, Danhui Liang, Jifei Chang, Xin Wang, Jiaguo Yan, Xiang Cheng, Lili Dong, Nan Li
Summary: This study evaluated the changes of rFe, vFe, and RV after removing EPS, and found that TB-EPS played a crucial role in vivianite formation, contributing 28-51% of vivianite recovery and 34-55% of iron reduction. Electronic shuttle substances in TB-EPS enhanced the EET rate and efficiency between cells and Fe(III). Additionally, redox proteins were embedded in EPS, shortening the distance of electron hopping and accelerating vivianite recovery from wastewater.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Agricultural Engineering
Cong-Cong Tang, Xinyi Zhang, Zhang-Wei He, Yu Tian, Xiaochang C. Wang
Summary: In an algal-bacteria symbiosis sludge system, extracellular polymeric substances (EPSs) play a crucial role in storing and transferring nutrients. The novel algaebased sequencing batch suspended biofilm reactor (A-SBSBR) model showed improved storage for various nutrients compared to conventional reactors, with mechanisms including active transport of divalent cations by microalgae and increased production of EPS through photosynthesis.
BIORESOURCE TECHNOLOGY
(2021)
Article
Engineering, Environmental
Anqi Wang, Jun Hou, ChunMei Tao, Lingzhan Miao, Jun Wu, Baoshan Xing
Summary: Chemical sulfidation is effective in improving the reactivity of zero-valent iron (S-ZVI). Inspired by the biogeochemical process of sulfidation in nature, researchers explored the biogenetic sulfidation of ZVI (BS-ZVI) using sulfate-reducing bacteria (SRB). BS-ZVI showed a degradation rate of 96.3% for trichloroethylene (TCE), comparable to S-ZVI (97.0%), but with a slower degradation rate due to extracellular polymeric substances (EPS) excreted by SRB. Organic components of EPS, including polysaccharides, humic acid-like substances, and proteins, were detected in BS-ZVI. The acetylation degree of EPS increased with ZVI and S/Fe concentration, inhibiting TCE degradation. Overall, this study demonstrated the potential of biogenetic sulfidation as an alternative method for improving the reactivity of ZVI.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
