Article
Engineering, Chemical
Ailing Zhu, Yan Wu, Maoqing Wang, Guoxin Lan, Yaping Xia, Chang Liu, Xiaopeng Ji, Jia Shen, Tingzhen Li, Chuan Fu, Panyue Zhang, Yi Wang, Mengting Pan
Summary: This study investigated the combined effects of FeCl3 and biochar (FB) on the pyrolysis products of sewage sludge using TG-MS and Py-GC/MS. The results showed that FB improved the calorific value and chemical stability of bio-oil, reduced the release of harmful gases, and had the catalytic ability to remove tar. FB also moderately reduced the formation of certain compounds through synergistic action, and reduced the energy required during pyrolysis.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Environmental Sciences
Kinga M. Berta, Robert Kurdi, Pal Lukacs, Marton Penk, Viola Somogyi
Summary: The study showed that red mud mixed with sewage sludge or dredging sludge can enhance plant growth, with elements like lead and nickel being absorbed by the plants in elevated concentrations. However, the potential environmental impacts of these mixtures, particularly on metal uptake, need to be carefully monitored and controlled.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Energy & Fuels
Chen Song, Caifu Li, Dan Zhu, Wenbin Chen, Lun Ai, Neng Huang, Li Yang, Chuwen Guo, Fang Liu
Summary: This study proposes a comprehensive method for the treatment and reuse of industrial waste, such as sewage sludge and red mud. By using red mud as an oxygen carrier, sewage sludge as fuel, and low-concentration methane as an oxidizing gas, the study demonstrates efficient recycling of these wastes. The results show high treatment efficiency and reuse effectiveness under specific temperature and gas proportions.
Article
Environmental Sciences
Yeqing Li, Xingru Yang, Mingyu Zhu, Liming Dong, Hao Jiang, Quan Xu, Hongjun Zhou, Yongming Han, Lu Feng, Chengfei Li
Summary: This study proposed a new technical route of combining the hydrothermal carbonization (HTC) with Fenton's reagent and lignocellulose biomass for sludge treatment. The method can serve as a cleaner and eco-friendly treatment of sludge, achieving sludge reduction, improving the adsorption capacity and combustion performance of hydrochars.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Thermodynamics
Tawsif Rahman, Hossein Jahromi, Poulami Roy, Sushil Adhikari, Ehsan Hassani, Tae-Sik Oh
Summary: The study found that ethylene atmosphere can increase biocrude yield, reduce viscosity, lower acidity, and efficiently reduce nitrogen content in the biocrude. These results suggest that ethylene atmosphere has the potential to enhance biocrude production during catalytic HTL treatment.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Environmental Sciences
Sangho Lee, Young-Min Kim, Muhammad Zain Siddiqui, Young-Kwon Park
Summary: Thermogravimetric analysis and pyrolyzer-gas chromatography/mass spectrometry were used to study the kinetic behavior and product distribution of thermal and catalytic pyrolysis of different types of sewage sludge. Municipal sewage sludge (MSS) has a lower activation energy and produces more fatty acids and cholesterol than livestock manure sewage sludge (LMSS). By using a different catalyst, the product distribution of MSS can be altered, increasing the yield of aromatic hydrocarbons.
ENVIRONMENTAL POLLUTION
(2021)
Article
Thermodynamics
Weike Liu, Xiaoyuan Zheng, Yuheng Feng, Zhi Ying, Bo Wang, Binlin Dou
Summary: A new alternative process combining hydro-thermal carbonization, pyrolysis, and steam reforming was proposed for sustainable management of sewage sludge (SS) to energy/fuels. Models developed by multiple linear regression, Merrick correlations and kinetics showed good agreement with experimental data. Sensitivity analysis demonstrated that hydro-thermal carbonization improved the H2 fraction and decreased tar concentration in the gas significantly.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Chemistry, Analytical
Jingshu Li, Yanlong Li, Feifei Liu, Xiaojuan Zhang, Mengnv Song, Rundong Li
Summary: Biochar produced by pyrolysis of sewage sludge has great potential for P recycling, but the transformation mechanism of phosphorus species during pyrolysis is still unclear, limiting its further application. This study investigated the effects of pyrolysis temperature and additives on P speciation and proposed the transformation pathways and mechanism. The results showed that various P forms in sewage sludge were converted to different compounds, with the addition of CaO promoting the formation of Ca-P. The study provides theoretical support for the agricultural application of SS-pyrolysis biochar.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Article
Chemistry, Analytical
Sirui Tong, Shuping Zhang, Haoxin Yin, Jiaxing Wang, Minzi Chen
Summary: This study evaluated the co-hydrothermal treatment combined with pyrolysis of rice straw and sewage sludge to produce biochar, aiming to reasonably dispose of sewage sludge as a resource and avoid secondary pollution. Results showed a synergy between rice straw and sewage sludge during the co-HTP process, leading to slightly higher biochar yield than predicted values. The co-HTP process also promoted the increase of aromaticity and stability of biochar, with a significant increase in specific surface area. Additionally, the process decreased the total concentrations of heavy metals in biochar and helped immobilize heavy metals to reduce environmental risks.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2021)
Article
Energy & Fuels
Ruiqu Deng, Linzheng Wang, Ruizhi Zhang, Yonghao Luo
Summary: This study investigated the pyrolysis behavior of large sewage sludge particles through experimental and numerical analysis. Factors such as particle size and moisture content were found to have significant impact on the pyrolysis process, leading to coexistence of drying and devolatilization with a compensation effect. Auto-gasification caused by moisture outflow was also observed, particularly with increasing initial moisture content.
Article
Environmental Sciences
Qiang Liu, Jiayi Li, Zheng Fang, Yangyang Liu, Yunfeng Xu, Xiuxiu Ruan, Xiaolei Zhang, Weimin Cao
Summary: The pyrolyzation of sewage sludge can convert inherent phosphorus into bioavailable phosphate forms, making sewage sludge-derived biochar a potential soil fertilizer. This study investigated the release behavior of phosphorus from biochar and CaO-amended biochar under different pyrolysis temperatures, showing that higher temperature and CaO addition enhanced the conversion of non-apatite inorganic phosphorus into more bioavailable forms. Acidic and alkaline conditions favored the fast release of phosphorus from biochar, while biochar with CaO addition exhibited a slower release of phosphorus compared to biochar without CaO.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Environmental Sciences
Meenu Gautam, Madhoolika Agrawal
Summary: The study investigated the effects of different red mud treatments on essential oil extracted from vetiver roots in sewage-sludge amended soil. The results showed that 5% and 10% red mud treatments improved the quantity and quality of the essential oil without metal contamination.
INTERNATIONAL JOURNAL OF PHYTOREMEDIATION
(2021)
Review
Environmental Sciences
Matej Husek, Jaroslav Mosko, Michael Pohorely
Summary: With the growing emphasis on environmental protection, this review analyses different methods of sewage sludge treatment in terms of potential environmental risk and raw materials recovery. The study suggests that direct use of sewage sludge in agriculture should no longer be considered as a source of nutrients and organic matter due to its pollutant content. The review also highlights pyrolysis as a sustainable method for sludge treatment in remote locations with low heavy metal content, and discusses different technologies for recovering phosphorus from sludge ash.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Environmental
Carol Huang, Badr A. Mohamed, Loretta Y. Li
Summary: This study investigated the feasibility of co-pyrolysis as a sewage sludge treatment process. The results showed that mixing co-feed biomass with sewage sludge reduced the overall environmental burden by 58-83%. Co-pyrolysis of wheat straw/SS performed better than sawdust/SS in terms of environmental impact. All examined scenarios achieved a net positive energy balance and reduced global warming potential. Sensitivity analysis indicated that transportation of feedstock and pyrolysis products should be prioritized to limit environmental burden. Co-pyrolysis is an eco-friendly and economically viable method for sewage sludge treatment.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Hongyan Nan, Xue Zhang, Jiapeng Yang, Kai Jia, Yijun Cao, Chongqing Wang
Summary: This study proposed a method of 'co-hydrothermal treating red mud and sewage sludge (SS)' to produce a soil-like matrix, and investigated the effects of SS addition on the characteristics of hydrothermal solid and liquid products of RM. The results showed improvements in pH, particle aggregation, and organic components of hydrothermal products with the introduction of SS. The strategy of co-hydrothermal treating RM and SS to produce the soil-like matrix could efficiently consume solid wastes and offer a promising solution for the challenges faced by the aluminium industry and sewage treatment plants.
ENVIRONMENTAL TECHNOLOGY
(2023)
Article
Engineering, Environmental
Sijing Chen, Zhen Li, Longsheng Wu, Lu Liu, Jingping Hu, Huijie Hou, Sha Liang, Jiakuan Yang
Summary: Hemin has attracted attention as an efficient catalyst, but molecular aggregation limits its direct application. Immobilizing hemin on multiwalled carbon nanotubes (CNTs) through ball milling was done to address this issue. The CNTs-hemin catalyst showed significantly improved performance in the peroxymonosulfate system, with a 650-fold increase in the apparent rate constant and 97.8% degradation of sulfathiazole in 5 minutes. The dominant reactive species in the CNTs-hemin/peroxymonosulfate system were proposed to be high-valent iron-oxo porphyrin cation ((Porp)+???FeIV=O) radicals. Electron transfer between CNTs and hemin promoted the generation of these radicals. This research enriches the understanding of supported biomimetic catalysts for PMS activation and highlights the role of support materials in catalytic activity.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Review
Environmental Sciences
Yafei Shi, Jiaqi Chai, Tao Xu, Lihu Ding, Meijie Huang, Fangmao Gan, Kewu Pi, Andrea R. Gerson, Jiakuan Yang
Summary: This article provides a review on the separation and extraction methods of microplastics (MPs) from low-value organic solid waste (LOSW). It discusses the occurrence and source of MPs, as well as their output and impact on LOSW heat and biological treatments. The fate and co-effects of MPs and other pollutants in landfills and soils are also reviewed, highlighting the migration and transformation of MPs in domestic source LOSW.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Manhong Ji, Shuai Guo, Hong Zhang, Yuxin Zhang, Zhihua Wang, Jiabao Qin, Tong Sun, Dongxu Liang, Yidi Gao, Suiyi Zhu
Summary: The blackish ropy scum from the petrochemical wastewater treatment plant was separated as magnetic char and combustible gas/tar through one-step pyrolysis with the addition of Fe-rich sludge. The magnetic char was then modified to enhance the removal of heavy metals Cu and Ni from EDTA-bearing wastewater. The bifunctional char showed excellent adsorption performance and practicality in the enrichment of Cu and Ni.
ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Wenhao Yu, Mingyang Li, Sha Liang, Qi Xu, Peiyuan Zhang, Huijie Hou, Jingping Hu, Jiakuan Yang
Summary: For the first time, a one-step spray pyrolysis process has been investigated in the recycling of spent lead-acid batteries (LABs). The process involves desulfurizing the spent lead paste to obtain lead acetate (Pb(Ac)2) solution, which is then sprayed into a tube furnace for pyrolysis to produce lead oxide (PbO). Under optimized conditions, a low-impurity lead oxide product with better performance than commercial lead oxide powder was obtained. This study provides a strategy for the short-route recovery of spent LABs.
Article
Engineering, Environmental
Ye Chen, Yan Ke, Sha Liang, Jingping Hu, Huijie Hou, Jiakuan Yang
Summary: This study proposes a co-pyrolysis process using Bayer red mud (RM) to upgrade non-metallic fractions (NMFs) from WPCBs. The process achieves high bromine fixation efficiency and obtains a higher content of lightweight pyrolysis tar. Experimental and theoretical calculations investigate the mechanism of catalytic pyrolysis and simultaneous bromine fixation of NMFs by RM, with Fe2O3, CaCO3, and Al2O3 being identified as key components. The addition of 15 wt% RM enables the fixation of 89.55 wt% bromine, compared to 35.42 wt% without RM, due to the formation of FeBr2 and CaBr2. The lightweighting of tar is achieved by reducing the energy barrier of TBBPA decomposition, with Fe2O3 having the greatest effect. The content of lightweight tar in the catalytic pyrolysis of NMFs with 15 wt% RM is 44.29% higher compared to direct pyrolysis. This work provides guidance for the low-cost and eco-friendly recycling of e-wastes using co-pyrolysis with RM.
Article
Engineering, Environmental
Liang Yang, Xiao Guo, Sha Liang, Fan Yang, Mingxuan Wen, Shushan Yuan, Keke Xiao, Wenbo Yu, Jingping Hu, Huijie Hou, Jiakuan Yang
Summary: In this study, a sustainable strategy for P recovery from sewage sludge was proposed. It involved alkali-activated pyrolysis, water leaching, and crystallization processes, resulting in the recovery of a high value-added product called vivianite. The effects of alkali activator type and dose on P transformation during sludge pyrolysis were investigated, and a dose of 50 wt% KHCO3 was determined as the optimal condition. The study demonstrated that KHCO3-activated pyrolysis significantly increased the water-soluble P content in the biochar derived from ferric sludge, leading to the recovery of vivianite with a high purity through crystallization. A total P recovery efficiency of 88.08% was achieved throughout the process, indicating the promising potential of this approach.
Editorial Material
Chemistry, Multidisciplinary
Suiyi Zhu, Wei Fan, Xinfeng Xie, Jadambaa Temuujin
FRONTIERS IN CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Zhan Qu, Jiancong Liu, Ting Su, Suiyi Zhu, Junzhen Liu, Yusen Chen
Summary: In this study, a novel approach was used to recover precious metal titanium from red mud waste by acid leaching and boiling. The method achieved effective separation of low-value metals and resulted in the recovery of high-purity titanium. The economic assessment showed a profit of $101.06 per ton of treated red mud.
FRONTIERS IN CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Suiyi Zhu, Jian Wang, Yuhong Huang, Ying Wang, Yuxin Zhang, Jiabao Qin, Jiancong Liu, Jinlu Yao, Meichun Ji
Summary: pH adjustment was previously considered a simple step in the hydrometallurgy process, but its complicated operation was overlooked. In some industrial applications, slow adjustment of leachate pH using diluted alkaline solution caused drawbacks such as increased leachate volume and droplet hydrolysis/coagulation. However, new promising methods for rapid pH adjustment have been developed, especially in sealed high-temperature/pressure vessels. Redox/decomposition reactions of nitrate/urea and organics have emerged as new routes, which show spontaneous activity at high temperatures to generate/consume free H+ and achieve rapid and homogeneous pH adjustment.
FRONTIERS IN CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Dongxu Liang, Yidi Gao, Fanrong Kong, Hong Zhang, Yuxin Zhang, Tong Sun, Suiyi Zhu, Xinfeng Xie, Yang Yu, Temuujin Jadambaa, Kaung Htet Oo, Zhan Qu
Summary: A one-dimensional polymeric Fe/S rod with nanoscale diameter was produced using FeCl3 and Na2S/NaOH under atmospheric conditions. By partially or fully replacing Na with K, the rod grew radially to form a long rod with diameters of 1 μm and/or 5-10 μm. The replacement of Na/K in the rod allowed for its retention of shape in an alkaline solution and showed superior efficiency in removing Zn/Cu from electroplating wastewater compared to other reagents. This method not only enables clean production and recycling of K but also offers potential applications in wastewater treatment.
MATERIALS TODAY COMMUNICATIONS
(2023)
Review
Engineering, Environmental
Yan Ke, Ye Chen, Sha Liang, Jingping Hu, Huijie Hou, Junda Quan, Xingwu Li, Huabo Duan, Shushan Yuan, Jiakuan Yang
Summary: The global generation of industrial solid waste (ISW) reaches billions of tons annually. However, due to its low recycling efficiency and accompanying environmental pollution, it is difficult to directly utilize ISW on a large scale. Improper disposal of ISW in many developing countries leads to serious pollution to the air, water, and soil environment. In this study, a systematic review was conducted on the recycling and pollution control of major ISW. A bi-tetrahedron model was proposed based on the fundamental central paradigm of materials science and engineering to promote sound ISW management.
RESOURCES CONSERVATION AND RECYCLING
(2023)
Article
Engineering, Environmental
Qian Zhu, Dingkang Qian, Mengjiao Yuan, Zhen Li, Ziming Xu, Sha Liang, Wenbo Yu, Shushan Yuan, Jiakuan Yang, Huijie Hou, Jingping Hu
Summary: Electrogenic biofilms in microbial electrochemical systems play important roles in simultaneous wastewater treatment and energy recovery. This research investigated the coordination between intracellular c-di-GMP signaling and reinforced quorum sensing on the formation of mixed-cultured electrogenic biofilm under disruption of electrical signaling. The study revealed that intracellular c-di-GMP was reinforced in response to the disruption, and the dominant DGC induced biofilm formation by mediating exopolysaccharide synthesis. Additionally, reinforced quorum sensing could benefit the biofilm restoration. The study proposed a potential strategy for electrogenic biofilm regulation from the perspectives of cell-to-cell communication.
Article
Engineering, Environmental
Ting Su, Jingyi Pan, Hongyu Chen, Zhihua Wang, Jiancong Liu, Rui Bian, Suiyi Zhu, Jiewen Yang, Jialin Liang, Weilu Yang, Yang Yu
Summary: A facile hydrothermal route was developed to recycle the impurity-rich black powder from spent Li-ion batteries as giniite spheres and griceite cubes. Adjusting the pH value of the leachate and adding glucose can effectively remove impurities and precipitate lithium as cubic griceite. This method shows promise for the effective recycling of lithium from spent Li batteries.
JOURNAL OF HAZARDOUS MATERIALS ADVANCES
(2023)
Article
Engineering, Environmental
Ying Wang, Shuai Guo, Manhong Ji, Hong Zhang, Suiyi Zhu, Xinfeng Xie, Yang Yu
Summary: In this study, Fe-rich cold-rolling sludge was used as a catalyst to convert tar in oil scum into valuable volatiles. The addition of cold-rolling sludge increased the conversion efficiency by 73% compared to direct pyrolysis. Both aromatics and saturated hydrocarbons in the oil scum were completely converted into base oil and gas products during the pyrolysis process. This work provides a promising strategy for converting oil scum into valuable gas, base oil, and magnetic char.
ENVIRONMENTAL ENGINEERING SCIENCE
(2023)
Article
Chemistry, Physical
Bihao Zhuang, Zicong Jin, Dehua Tian, Suiyi Zhu, Linqian Zeng, Jiandong Fan, Zaizhu Lou, Wenzhe Li
Summary: Luminescent materials, especially Pb-based and Sn-based perovskites, have shown promise for various applications. However, their high toxicity and low stability limit their practical use. In this study, Sb-based perovskites were investigated as a potential alternative due to their low toxicity and high stability. The researchers reported a novel series of (4-HBA)SbX5·H2O single crystals and found that manipulating the Cl- concentration can improve their optical properties and photoluminescence efficiency.
ACTA PHYSICO-CHIMICA SINICA
(2023)
Article
Engineering, Environmental
Rong-Gui Zhu, Chang-Gui Pan, Feng-Jiao Peng, Chao-Yang Zhou, Jun-Jie Hu, Kefu Yu
Summary: This comprehensive survey investigated the occurrence, bioaccumulation, and trophic magnification of parabens and their metabolite 4-HB in a marine food web. Results showed that parabens were the predominant pollutants in marine organisms, with significant bioaccumulation from sediments. The estimated trophic magnification factor indicated biomagnification for MeP and trophic dilution for 4-HB. Overall, the risks for humans consuming marine organisms were found to be low.
Article
Engineering, Environmental
Andres F. Torres-Franco, Deborah Leroy-Freitas, Cristina Martinez-Fraile, Elisa Rodriguez, Pedro A. Garcia-Encina, Raul Munoz
Summary: Anaerobic and microalgae-based technologies have emerged as sustainable alternatives for municipal wastewater treatment. However, the presence of viruses in the treated wastewater is a major concern for reuse applications. This study assessed the ability of these technologies to reduce viruses during secondary wastewater treatment. The results showed that all technologies were effective in reducing the concentration of viruses, with microalgae-based treatment exhibiting the highest potential for reducing the disinfection requirements of treated wastewater.
Article
Engineering, Environmental
Young Gwang Kim, Sae Yun Kwon, Spencer J. Washburn, Scott C. Brooks, Ji Won Yoon, Lucien Besnard
Summary: The study uses Hg isotope ratios to identify the sources and exposure pathways of mercury in bivalves, finding that dissolved Hg phases in the water column are the primary source and exposure pathway to bivalves. This provides new insights into using bivalves as bioindicators for sediment quality monitoring.
Article
Engineering, Environmental
Hui Geng, Ying Xu, Rui Liu, Dianhai Yang, Xiaohu Dai
Summary: This study investigates the effect of cation exchange resin (CER) on the sequential recovery of hydrogen and methane from anaerobic digestion (AD) and the corresponding mechanisms. The results show that CER can simultaneously enhance the production of hydrogen and methane by promoting the solubilisation, hydrolysis, and acidification of organic matter. Additionally, CER facilitates effective contact between bacteria and organic particulates and reduces the energy barrier for mass transfer during methane production. The study also reveals changes in the microbial community structure and metagenomics during the AD process.
Article
Engineering, Environmental
Xiaojing Lin, Zhan Jin, Shunfeng Jiang, Zhiquan Wang, Suqing Wu, Ke Bei, Min Zhao, Xiangyong Zheng
Summary: Dehumidification combined with addition of absorbent resin supplement (ARS) was used to achieve rapid evaporation of non-pretreated urine, resulting in high water evaporation efficiency and nutrient recovery.
Article
Engineering, Environmental
Yangli Che, Chaoran Lin, Shen Li, Jiao Liu, Longhai Zhu, Shilei Yu, Nan Wang, Haoshuai Li, Mutai Bao, Yang Zhou, Tonghao Si, Rui Bao
Summary: Hydrodynamic processes play a crucial role in the transmission of sediments, microbial assembly, and organic carbon redistribution in the ocean. Through experiments and analysis, we found that hydrodynamics shape the assembly of microbial communities and control the redistribution of different sourced organic carbon, thereby influencing microbial-mediated biogeochemical transformation.
Article
Engineering, Environmental
Chao Chen, Yu Yang, Nigel J. D. Graham, Zhenyu Li, Xingtao Yang, Zhining Wang, Nadia Farhat, Johannes S. Vrouwenvelder, Li -an Hou
Summary: The fouling of seawater reverse osmosis membranes is a persistent challenge in desalination. This study monitored the operational performance of a desalination plant for 7 years and the fouling development in different areas of membrane modules. The findings showed that operational performance declined over time and fouling mainly occurred at the feed side of the modules, with the highest microbial diversity. Keystone species like Chloroflexi and Planctomycetes played an important role in maintaining community structure and biofilm maturation. Polysaccharides, soluble microbial products, marine humic acid-like substances, and inorganic substances contributed to fouling. Overall, biofouling had a significant impact on membrane fouling after 7 years of operation.
Article
Engineering, Environmental
Dan Li, Jieyi Sun, Yibo Fu, Wentao Hong, Heli Wang, Qian Yang, Junhong Wu, Sen Yang, Jianhui Xu, Yunfei Zhang, Yirong Deng, Yin Zhong, Ping'an Peng
Summary: Sulfidation-oxidation treatment of magnetite (Fe3O4) enhances the production of dark center dot OH, which can efficiently degrade dissolved organic matter (DOM) and accelerate carbon cycling.
Article
Engineering, Environmental
Cheng Yu, Kaijun Wang, Kaiyuan Zhang, Ruiyang Liu, Pingping Zheng
Summary: This study implemented a microaerobic-aerobic configuration in a full-scale municipal wastewater treatment facility and investigated the effects on sludge characteristics, pollutant removal, microbial community, and granulation mechanisms. The results showed successful transition from flocculent-activated sludge to well-defined AGS after two months of operation. The primary pathways for pollutant removal were simultaneous nitrification, denitrification, and phosphorus removal. Moreover, the incorporation of internal separators induced shifts in the flow pattern, which promoted granulation.
Article
Engineering, Environmental
Zhe Zhang, Shaoyang Hu, Guangrong Sun, Wei Wang
Summary: Halogenated aromatic disinfection byproducts (DBPs), such as halogenated phenols, have garnered widespread attention due to their high toxicity and prevalence. This study reports on the analysis, occurrence, and cytotoxicity of a group of emerging halogenated aromatic DBPs, known as halogenated polyhydroxyphenols (HPPs), in drinking water.
Article
Engineering, Environmental
Shengyue Chen, Jinliang Huang, Peng Wang, Xi Tang, Zhenyu Zhang
Summary: Accurate prediction of river water quality is crucial for sustainable water management. This study introduces wavelet analysis and transfer learning techniques to assist LSTM modeling, proposing a newly coupled modeling approach that improves short-term prediction of river water quality.
Article
Engineering, Environmental
Bang Du, Xinmin Zhan, Piet N. L. Lens, Yifeng Zhang, Guangxue Wu
Summary: Efficient anaerobic digestion relies on the cooperation of different microorganisms with different metabolic pathways. This study investigated the effects of different operational modes and the addition of powdered activated carbon (PAC) on ethanol metabolic pathways. The results showed that the SBR mode and the presence of CO2 facilitated ethanol metabolism towards propionate production, while the CFR mode with extended solids retention time enriched Geobacter. Adjusting operational modes and PAC addition can modulate anaerobic ethanol metabolism and enrich Geobacter.
Article
Engineering, Environmental
Wanfa Wang, Si-Liang Li, Jun Zhong, Yuanbi Yi, Fujun Yue, Zenglei Han, Qixin Wu, Ding He, Cong-Qiang Liu
Summary: This study compares the carbon biogeochemical processes in karst and non-karst regions within large thermal stratified river-reservoir systems. The results demonstrate that karst reservoirs have a reduced potential for carbon emissions and highlight the importance of considering geologic settings to improve accuracy in regional and global CO2 emission estimates.
Article
Engineering, Environmental
Chunxia Jiang, Zelong Zhao, Dong Zhu, Xiong Pan, Yuyi Yang
Summary: This study analyzed the occurrence and distribution of antibiotic resistance genes (ARGs) in different environmental media of the Yangtze River using metagenomics. Core resistome dominated by multidrug resistance genes was found in all samples, while rare resistome dominated by various resistance genes was more prevalent in plasmids. Specific bacteria were identified as hosts for both core and rare resistomes, with high clinical concern ARGs found in the rare resistome. Particle-associated environment provided the most ideal conditions for resistome hosts. This study provided insights into the genetic locations of ARGs and the community assembly mechanisms of ARG hosts in freshwater environments.
Article
Engineering, Environmental
Yu Zhang, Yongtao He, Linchun Jia, Lei Xu, Zheng Wang, Yueling He, Ling Xiong, Xumeng Lin, Hong Chen, Gang Xue
Summary: By synergizing organic carbon source, thiosulfate, and zero-valent iron, efficient mixotrophic denitrification of oligotrophic secondary effluent can be achieved. Thiosulfate plays a vital role in promoting TN removal efficiency, while corrosion of Fe0 releases OH- to neutralize H+ from thiosulfate-driven denitrification, creating a suitable environment for denitrification. The coordination of thiosulfate and Fe0 maintains the dominance of Thiobacillus for denitrification.