Article
Engineering, Environmental
Maulana Yusup Rosadi, Sutra Maysaroh, Hudori Hudori, Kanika Sarkar, Toshiro Yamada, Fusheng Li
Summary: The study evaluated the characteristics of dissolved organic matter (DOM) released from sludge stored under oxic and anoxic conditions at different temperatures, and its impact on chlorine consumption. Significant differences were observed in the composition of DOM and chlorine consumption, with humic-like substances showing higher chlorine consumption than protein-like substances. Parameters such as ultraviolet absorbance at 260 nm and fluorescence intensity of humic-like substances based on EEM were found to have a strong correlation with chlorine consumption.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Nanoscience & Nanotechnology
Soraia P. S. Fernandes, Petr Kovar, Milan Psenicka, Artur M. S. Silva, Laura M. Salonen, Begona Espina
Summary: This study investigated the adsorption performance of three COFs for different MC derivatives, revealing different adsorption efficiencies for different toxins. By selecting COF functional groups, specific compounds can be selectively targeted or excluded, providing insights for the design of more efficient and selective adsorbent materials.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Environmental
Qingqing Kong, Lei Ye, Yanheng Pan, Yangjian Zhou, Yu Lei, Zihan Zeng, Siqi Chen, Liaoliao Yao, Xinran Zhang, Paul Westerhoff, Xin Yang
Summary: This study found that dissolved organic matter (DOM) has a significant impact on the photolysis of free chlorine. It was discovered that triplet state DOM (DOM-D-3*) can cause the decay of free chlorine. The study revealed a previously overlooked pathway of free chlorine decay during UV irradiation in the presence of DOM.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Gulizhaer Abulikemu, Thomas F. Speth, Jeffrey A. Vogt, Maria Meyer, Ying Hong, Jonathan G. Pressman
Summary: The study demonstrates that reconstituted lyophilized NOM can be used as a surrogate for source water in GAC evaluations, especially when evaluating NOM as the constituent of interest. The study also highlights factors that may affect the evaluation results, such as changes in characteristics during GAC regeneration and grinding, and differences in chloride concentrations in water.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Engineering, Environmental
Yangjian Zhou, Fangyuan Cheng, Dongyang He, Ya-nan Zhang, Jiao Qu, Xin Yang, Jingwen Chen, Willie J. G. M. Peijnenburg
Summary: This study investigated the effects of UV/chlorine treatment on the photophysical and photochemical properties of DOM using Suwannee River fulvic acid (SRFA) and Suwannee River natural organic matter (SRNOM) as representatives. The results showed that increasing chlorine dosage led to decreased absorbance of the two DOM samples and changes in their aromaticity, molecular weight, and electron-donating capacity. The quantum yields of excited triplet state of DOM, singlet oxygen, and hydroxyl radicals first decreased and then increased with increasing chlorine dosages in the UV/chlorine systems due to different reaction pathways. This study provides insights into the dynamic roles of DOM in the photodegradation of micropollutants.
Article
Engineering, Environmental
Qiyuan Sun, Shanbin Wu, Ran Yin, Xingjian Bai, Arun K. Bhunia, Changqing Liu, Yuyi Zheng, Feifeng Wang, Ernest R. Blatchley
Summary: The molecular weight of fulvic acid has a significant impact on the degradation of MC-LR in the chlorine/UV process, with small molecular weight FA inhibiting further degradation of MC-LR and reducing its cytotoxicity.
Article
Engineering, Environmental
Yu Lei, Xin Lei, Paul Westerhoff, Xinran Zhang, Xin Yang
Summary: Chlorine radicals, including Cl· and Cl2(·-), are produced in sunlight waters or water treatment processes. Dissolved organic matter (DOM) plays a significant role in reacting with or scavenging Cl· and Cl2(·-) in water. This study quantified the reaction rates between chlorine radicals and DOM and observed that DOM with high aromaticity and total antioxidant capacity tends to react faster with Cl2(·-). Additionally, the study monitored the formation of chlorinated byproducts, highlighting the importance of DOM in scavenging chlorine radicals and the potential risks associated with producing unknown toxicity chlorinated byproducts.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Analytical
Xiaoqian Wei, Shanlin Wang, Yujuan Zhan, Tianhan Kai, Ping Ding
Summary: We report a methylene blue-modified electrochemical aptamer sensor for determining microcystin-LR. The sensor signal transduction is based on changes in conformation and position of methylene blue induced by binding with microcystin-LR. We optimized the parameters and evaluated the sensor's electrochemical performance using square wave voltammetry. The reliability of the method was verified by testing environmental samples, and the sensor was shown to be reusable and regenerable with good accuracy and reproducibility. This rapid, reagent-free, and sensitive sensing platform will facilitate routine monitoring of microcystin-LR.
Article
Environmental Sciences
Zhou Liang, Robert T. Letscher, Angela N. Knapp
Summary: Surface ocean bulk and semi-labile dissolved organic matter (DOM) stoichiometry vary across ocean regions with global means of 387:26:1 and 179:20:1, respectively. Surface ocean DOC:DOP and DON:DOP concentration ratios are more variable than DOC:DON concentration ratios. Surface ocean gradients in P-depleted DOM stoichiometries in the Pacific and Atlantic basins reflect variable nutrient stress.
GLOBAL BIOGEOCHEMICAL CYCLES
(2023)
Article
Engineering, Environmental
Tahir Maqbool, Jiaxing Zhang, Yanling Qin, Muhammad Bilal Asif, Quang Viet Ly, Zhenghua Zhang
Summary: This study investigated the impacts of seasonal variations on chlorine consumption and DOM composition, finding a direct relationship between chlorine consumption and N-Nitrosodimethylamine, with elevated consumption in the wet season and dominance of humic-like components. Fluorescence moieties related to humic substances acted as a surrogate for chlorine consumption, and single fluorescence peaks showed potential for on-line monitoring and portable purposes. This field-based study demonstrated the application of fluorescence spectroscopy in designing chlorine dose for optimal residual chlorine at consumer's tap.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Ling Du, Yanmei Liu, Zhineng Hao, Miao Chen, Liping Li, Dong Ren, Junjian Wang
Summary: This study investigates the effects of different fertilization regimes on the molecular diversity and chlorine reactivity of soil-derived dissolved organic matter (SDOM) in cropland-impacted watersheds. The results show that chemical fertilization reduces the level and chlorine reactivity of SDOM, while straw return increases the molecular diversity and chlorine reactivity of SDOM. Partially replacing chemical fertilizer with crop straw is an advantageous practice for reducing disinfection byproduct (DBP) risks in drinking water in cropland-impacted watersheds.
Article
Chemistry, Multidisciplinary
Wei-Qi Zhang, Yi-Dan Tu, Xu-Gang Wang, Yu Huang, Fan Xia
Summary: In this study, a novel solid-state nanochannel-based sensing system was constructed by growing metal-organic frameworks (MOFs) on anodic aluminum oxide (AAO) nanochannels and modifying them with an MC-LR-specific aptamer as a probe. This system achieved highly sensitive detection of MC-LR with a limit of detection of 0.004 ng mL(-1) and a sensitivity improvement of around 10,000-fold compared to nanochannels without MOF modification. Reliable detection of MC-LR in various water samples was also achieved with a relative standard deviation of less than 5.46% and recovery between 93.90% and 106.73%. This strategy provides significant insights for the practical applications of nanochannel-based sensing systems in environmental contaminant detection, food analysis, and medical analysis.
ENVIRONMENTAL SCIENCE-NANO
(2023)
Article
Engineering, Environmental
Fuhar Dixit, Pranav Chintalapati, Benoit Barbeau, Mengqi Han, Thomas Riley Rodney Whittaker, Madjid Mohseni
Summary: The study shows that the combined application of ion exchange resins and vacuum ultraviolet light can effectively remove organic matter and microcystin-LR from natural waters, improving the degradation rate of MCLR. By pre-treating with IX resins, a significant reduction in energy consumption and chlorine demand for surface waters was achieved.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Environmental Sciences
Parul Baranwal, Dae-Wook Kang, Youngwoo Seo
Summary: This study evaluated the impact of natural organic matter (NOM) on the biodegradation of MC-LR and explored the changes in NOM composition. The results demonstrated that the presence of algal organic matter (AOM) and humic substances (HS) significantly decreased the biodegradation rate of MC-LR. Additionally, fractionation and fluorescence spectroscopy analyses revealed the sequential utilization of different NOM components by bacteria and the metabolic processes involved.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Pian Wu, Xiaosheng Ye, Danqi Wang, Fangjie Gong, Xiaoqian Wei, Shan Xiang, Jingwen Zhang, Tianhan Kai, Ping Ding
Summary: A novel and versatile fluorescence sensor, Cas14-pMOFs fluorescence sensor, was developed for highly efficient detection of MC-LR by combining the CRISPR/Cas14a system with 2D-pMOFs. This sensor showed excellent performance and universality in detecting both nucleic acid and non-nucleic acid targets.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
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.