journal
https://read.qxmd.com/read/38412561/the-anaerobic-exposure-time-aet-as-a-novel-process-parameter-in-the-anaerobic-side-stream-reactor-assr-based-process-for-excess-sludge-minimization
#1
JOURNAL ARTICLE
Sara Mulone, Santo Fabio Corsino, Marco Capodici, Michele Torregrossa
Minimization of excess sludge produced by wastewater treatment plants has become a topical theme nowadays. One of the most used approaches to achieve this aim is the anaerobic side-stream reactor (ASSR) process. This is considered affected by the hydraulic retention time (HRT) of the anaerobic reactor, the anaerobic sludge loading rate (ASLR) and the sludge interchange ratio (SIR), although, studies available in the literature did not reflect a clear relationship with the sludge minimization yields. To overcome this, a novel parameter namely anaerobic exposure time (AET) was defined and related to reduction of the observed yield coefficient (Yobs ) in a lab-scale plant implementing the ASSR process...
February 25, 2024: Water Research
https://read.qxmd.com/read/38401472/new-insights-for-simultaneous-nutrient-removal-enhancement-and-greenhouse-gas-emissions-reduction-of-constructed-wetland-by-optimizing-its-redox-environment-through-manganese-oxide-addition
#2
JOURNAL ARTICLE
Mingde Ji, Xue Zhang, Jiayang Heng, Muhammad Tanveer, Jian Zhang, Zizhang Guo, Zhen Hu
Manganese oxide (MnOx ) is receiving increased interest in the nutrient removal of constructed wetlands (CWs); however, its service effectiveness for simultaneous greenhouse gas (GHG) emissions reduction is still vague. In this study, three vertical flow CWs, i.e., volcanics (CCW), manganese sand uniformly mixing with volcanics (Mn-CW) and MnOx doped volcanics (MnV-CW), were constructed to investigate the underlying mechanisms of MnOx on nutrient removal enhancement and greenhouse gas (GHG) emissions reduction...
February 23, 2024: Water Research
https://read.qxmd.com/read/38401471/drivers-of-cyanotoxin-and-taste-and-odor-compound-presence-within-the-benthic-algae-of-human-disturbed-rivers
#3
JOURNAL ARTICLE
Zane Rider, Abigal Percich, Yasawantha Hiripitiyage, Ted D Harris, Belinda S M Sturm, Alan E Wilson, Erik D Pollock, John R Beaver, Admin Husic
Freshwater benthic algae form complex mat matrices that can confer ecosystem benefits but also produce harmful cyanotoxins and nuisance taste-and-odor (T&O) compounds. Despite intensive study of the response of pelagic systems to anthropogenic change, the environmental factors controlling toxin presence in benthic mats remain uncertain. Here, we present a unique dataset from a rapidly urbanizing community (Kansas City, USA) that spans environmental, toxicological, taxonomic, and genomic indicators to identify the prevalence of three cyanotoxins (microcystin, anatoxin-a, and saxitoxin) and two T&O compounds (geosmin and 2-methylisoborneol)...
February 23, 2024: Water Research
https://read.qxmd.com/read/38402750/functionalization-of-seawater-reverse-osmosis-membrane-with-quorum-sensing-inhibitor-to-regulate-microbial-community-and-mitigate-membrane-biofouling
#4
JOURNAL ARTICLE
Chao Chen, Yu Yang, Chung-Hak Lee, Satoshi Takizawa, Zhenghua Zhang, How Yong Ng, Li-An Hou
Membrane biofouling is a challenge to be solved for the stable operation of the seawater reverse osmosis (SWRO) membrane. This study explored the regulation mechanism of quorum sensing (QS) inhibition on microbial community composition and population-level behaviors in seawater desalination membrane biofouling. A novel antibiofouling SWRO membrane (MA_m) by incorporating one of quorum sensing inhibitors (QSIs), methyl anthranilate (MA) was prepared. It exhibited enhanced anti-biofouling performance than the exogenous addition of QSIs, showing long-term stability and alleviating 22 % decrease in membrane flux compared with the virgin membrane...
February 22, 2024: Water Research
https://read.qxmd.com/read/38401473/ferrate-vi-assists-in-reducing-cytotoxicity-and-genotoxicity-to-mammalian-cells-and-organic-bromine-formation-in-ozonated-wastewater
#5
JOURNAL ARTICLE
Ye Du, Tong Liu, Lu-Lin Yang, Zhi-Min Song, Xin Dai, Wen-Long Wang, Bo Lai, Qian-Yuan Wu
Ozonation of wastewater containing bromide (Br- ) forms highly toxic organic bromine. The effectiveness of ozonation in mitigating wastewater toxicity is minimal. Simultaneous application of ozone (O3 ) (5 mg/L) and ferrate(VI) (Fe(VI)) (10 mg-Fe/L) reduced cytotoxicity and genotoxicity towards mammalian cells by 39.8% and 71.1% (pH 7.0), respectively, when the wastewater has low levels of Br- . This enhanced reduction in toxicity can be attributed to increased production of reactive iron species Fe(IV)/Fe(V) and reactive oxygen species (•OH) that possess higher oxidizing ability...
February 21, 2024: Water Research
https://read.qxmd.com/read/38401287/fenton-like-membrane-reactor-assembled-by-electron-polarization-and-defect-engineering-modifying-co-3-o-4-spinel-for-flow-through-removal-of-organic-contaminants
#6
JOURNAL ARTICLE
Xiao Zhang, Shengtao Xu, Kai Feng, Xi Li, Peng Yu, Qiang Liu, Jiankun Zhang, Xiulei Fan, Chao Liu, Huaili Zheng, Yongjun Sun
The application of Fenton-like membrane reactors for water purification offers a promising solution to overcome technical challenges associated with catalyst recovery, reaction efficiency, and mass transfer typically encountered in heterogeneous batch reaction modes. This study presents a dual-modification strategy encompassing electron polarization and defect engineering to synthesize Al-doped and oxygen vacancies (OV )-enriched Co3 O4 spinel catalysts (ACO-OV ). This modification empowered ACO-OV with exceptional performance in activating peroxymonosulfate (PMS) for the removal of organic contaminants...
February 21, 2024: Water Research
https://read.qxmd.com/read/38401286/uncovering-the-neglected-role-of-anions-in-trivalent-cation-based-coagulation-processes
#7
JOURNAL ARTICLE
Mengjie Liu, Xun Liu, Nigel J D Graham, Wenzheng Yu
Coagulation efficiency is heavily contingent upon a profound comprehension of the underlying mechanisms, facilitated by the evolution of coagulation theory. However, the role of anions, prevalent components in raw and wastewaters, has been relatively overlooked in this context. To address this gap, this study has investigated the impact of three common anions (i.e., chloride, sulfate, and phosphate) on Al-based coagulation. The results have shown that the influence of anions on coagulation depends predominantly on their ability to compete with hydroxyl groups throughout the entire coagulation process, encompassing hydrolysis, aggregation, and the growth of large flocs...
February 21, 2024: Water Research
https://read.qxmd.com/read/38387265/unveiling-intricate-transformation-pathways-of-emerging-contaminants-during-wastewater-treatment-processes-through-simplified-network-analysis
#8
JOURNAL ARTICLE
Yuli Qian, Linchang Guan, Yunhao Ke, Liye Wang, Xuebing Wang, Nanyang Yu, Qingmiao Yu, Si Wei, Jinju Geng
As the key stage for purifying wastewater, elimination of emerging contaminants (ECs) is found to be fairly low in wastewater treatment plants (WWTPs). However, less knowledge is obtained regarding the transformation pathways between various chemical structures of ECs under different treatment processes. This study unveiled the transformation pathways of ECs with different structures in 15 WWTPs distributed across China by simplified network analysis (SNA) we proposed. After treatment, the molecular weight of the whole component of wastewater decreased and the hydrophilicity increased...
February 21, 2024: Water Research
https://read.qxmd.com/read/38402752/fate-of-sulfamethoxazole-in-wetland-sediment-under-controlled-redox-conditions
#9
JOURNAL ARTICLE
Yujie He, Longxue Jiang, Xuan Wu, Wenhui Zhang, Yao Zong, Jiacheng Wang, Jinmei Chen, Jun Shan, Deyang Kong, Rong Ji
Redox condition is an important controlling factor for contaminant removal in constructed wetlands; however, the redox-sensitivity of antibiotic removal in wetland sediments under controlled conditions with specific electron acceptors remains unclear. Here, using a 14 C radioactive tracer, we explored fate of sulfamethoxazole (SMX) in a wetland sediment slurry under oxic, nitrate-reducing, iron-reducing, and methanogenic conditions. In the sterile treatment, unlike the comparable SMX dissipation from the water phase under four redox conditions, non-extractable residues (NERs) of SMX was highest formed in the sediment under oxic condition, mainly in sequestered and ester/amide-linked forms...
February 20, 2024: Water Research
https://read.qxmd.com/read/38401288/the-role-of-suspended-biomass-in-pfas-enrichment-in-wastewater-treatment-foams
#10
JOURNAL ARTICLE
Angel Chyi En We, Anthony D Stickland, Bradley O Clarke, Stefano Freguia
Foaming in aerated bioreactors at wastewater treatment plants (WWTPs) has been identified as an operational issue for decades. However, the affinity of per- and polyfluoroalkyl substances (PFAS) for air-liquid interfaces suggests that foam harvesting has the potential to become a sustainable method for PFAS removal from sewage. Aerated bioreactors' foams are considered three-phase systems, comprising air, aqueous and solid components, the latter consisting of activated sludge biomass. To achieve a comprehensive understanding of the capability of aerated bioreactors' foams to enrich PFAS, we analysed PFAS concentrations from WWTPs in both the solid and aqueous phases of the collapsed foams (foamate) and underlying bulk mixed liquors...
February 20, 2024: Water Research
https://read.qxmd.com/read/38394932/cable-bacteria-living-electrical-conduits-for-biogeochemical-cycling-and-water-environment-restoration
#11
REVIEW
Xinyan Xiong, Yi Li, Chi Zhang
Since the discovery of multicellular cable bacteria in marine sediments in 2012, they have attracted widespread attention and interest due to their unprecedented ability to generate and transport electrical currents over centimeter-scale long-range distances. The cosmopolitan distribution of cable bacteria in both marine and freshwater systems, along with their substantial impact on local biogeochemistry, has uncovered their important role in element cycling and ecosystem functioning of aquatic environments...
February 20, 2024: Water Research
https://read.qxmd.com/read/38387266/investigating-the-levels-spatial-distribution-and-trophic-transfer-patterns-of-short-chain-chlorinated-paraffins-in-the-southern-bohai-sea-china
#12
JOURNAL ARTICLE
Qingkui Cui, Dianfeng Han, Huawei Qin, Huanjun Li, Yongchun Liu, Wenjian Guo, Min Song, Jiawei Li, Yanqing Sun, Jingjing Luo, Jinglin Xue, Yingjiang Xu
The marine environment of the southern Bohai Sea is severely polluted by short-chain chlorinated paraffins (SCCPs). To improve understanding of how SCCPs occur and of how they migrate, are transformed, and transferred in this area, we collected seawater, sediment, and organism samples, and determined the SCCP contents using a new approach based on high-resolution mass spectrometry. The ΣSCCP concentrations in the seawater, sediment, and organism samples ranged from 57.5 to 1150.4 ng/L, 167.7-1105.9 ng/g (dry weight), and 11...
February 18, 2024: Water Research
https://read.qxmd.com/read/38382291/a-novel-method-for-identifying-aerobic-granular-sludge-state-using-sorting-densification-and-clarification-dynamics-during-the-settling-process
#13
JOURNAL ARTICLE
Zhi-Hua Li, Ruo-Lan Wang, Meng Lu, Xin Wang, Yong-Peng Huang, Jia-Wei Yang, Tian-Yu Zhang
Aerobic granular sludge is one of the most promising biological wastewater treatment technologies, yet maintaining its stability is still a challenge for its application, and predicting the state of the granules is essential in addressing this issue. This study explored the potential of dynamic texture entropy, derived from settling images, as a predictive tool for the state of granular sludge. Three processes, traditional thickening, often overlooked clarification, and innovative particle sorting, were used to capture the complexity and diversity of granules...
February 18, 2024: Water Research
https://read.qxmd.com/read/38402753/sequence-introgression-from-exogenous-lineages-underlies-genomic-and-biological-differences-among-cryptosporidium-parvum-iowa-lines
#14
JOURNAL ARTICLE
Wanyi Huang, Kevin Tang, Chengyi Chen, Michael J Arrowood, Ming Chen, Yaqiong Guo, Na Li, Dawn M Roellig, Yaoyu Feng, Lihua Xiao
The IOWA strain of Cryptosporidium parvum is widely used in studies of the biology and detection of the waterborne pathogens Cryptosporidium spp. While several lines of the strain have been sequenced, IOWA-II, the only reference of the original subtype (IIaA15G2R1), exhibits significant assembly errors. Here we generated a fully assembled genome of IOWA-CDC of this subtype using PacBio and Illumina technologies. In comparative analyses of seven IOWA lines maintained in different laboratories (including two sequenced in this study) and 56 field isolates, IOWA lines (IIaA17G2R1) with less virulence had mixed genomes closely related to IOWA-CDC but with multiple sequence introgressions from IOWA-II and unknown lineages...
February 17, 2024: Water Research
https://read.qxmd.com/read/38387269/molecular-insights-into-the-adsorption-and-penetration-of-oil-droplets-on-hydrophobic-membrane-in-membrane-distillation
#15
JOURNAL ARTICLE
Shideng Yuan, Xin Yang, Na Zhang, Jiaojiao Zhang, Shiling Yuan, Zhining Wang
Membrane fouling induced by oily substances significantly constrains membrane distillation performance in treating hypersaline oily wastewater. Overcoming this challenge necessitates a heightened fundamental understanding of the oil fouling phenomenon. Herein, the adsorption and penetration mechanism of oil droplets on hydrophobic membranes in membrane distillation process was investigated at the molecular level. Our results demonstrated that the adsorption and penetration of oil droplets were divided into four stages, including the free stage, contact stage, spreading stage, and equilibrium stage...
February 17, 2024: Water Research
https://read.qxmd.com/read/38387268/enzyme-induced-reactive-oxygen-species-trigger-oxidative-degradation-of-sulfamethoxazole-within-a-methanotrophic-biofilm
#16
JOURNAL ARTICLE
Xu Guo, Weng Mun Ong, He-Ping Zhao, Chun-Yu Lai
Although microorganisms carrying copper-containing membrane-bound monooxygenase (CuMMOs), such as particulate methane monooxygenase (pMMO) and ammonia monooxygenase (AMO), have been extensively documented for their capability to degrade organic micropollutants (OMPs), the underlying reactive mechanism remains elusive. In this study, we for the first time demonstrate biogenic reactive oxygen species (ROS) play important roles in the degradation of sulfamethoxazole (SMX), a representative OMP, within a methane-fed biofilm...
February 17, 2024: Water Research
https://read.qxmd.com/read/38382293/macronutrient-and-pfos-bioavailability-manipulated-by-aeration-driven-rhizospheric-organic-nanocapsular-assembly
#17
JOURNAL ARTICLE
Ming Zhang, Weifeng Qiu, Rui Nie, Qiaoyun Xia, Daoyong Zhang, Xiangliang Pan
Ubiquitous presence of the extremely persistent pollutants, per- and polyfluoroalkyl substances, is drawing ever-increasing concerns for their high eco-environmental risks which, however, are insufficiently considered based on the assembly characteristics of those amphiphilic molecules in environment. This study investigated the re-organization and self-assembly of perfluorooctane sulfonate (PFOS) and macronutrient molecules from rhizospheric organic (RhO) matter induced with a common operation of aeration...
February 17, 2024: Water Research
https://read.qxmd.com/read/38377929/impact-of-changes-in-biofilm-composition-response-following-chlorine-and-chloramine-disinfection-on-nitrogenous-disinfection-byproduct-formation-and-toxicity-risk-in-drinking-water-distribution-systems
#18
JOURNAL ARTICLE
Songyuan Zheng, Tao Lin, Han Chen, Xue Zhang, Fuchun Jiang
In practical drinking water treatment, chlorine and chloramine disinfection exhibit different mechanisms that affect biofilm growth. This study focused on the influence of biofilm composition changes, especially extracellular polymeric substance (EPS) fractions, on the potential formation and toxicity of nitrogenous disinfection by-products (N-DBP). Significant differences in microbial diversity and community structure were observed between the chlorine and chloramine treatments. Notably, the biofilms from the chloramine-treated group had higher microbial dominance and greater accumulation of organic precursors, as evidenced by the semi-quantitative confocal laser-scanning microscopy assay of more concentrated microbial aggregates and polysaccharide proteins in the samples...
February 17, 2024: Water Research
https://read.qxmd.com/read/38377924/methylmercury-photodegradation-in-paddy-water-an-overlooked-process-mitigating-methylmercury-risks
#19
JOURNAL ARTICLE
Huan Zhong, Hangyu Zhou, Yanbin Li, Chengjun Li, Martin Tsz-Ki Tsui, Carl P J Mitchell, Yang Zhou, Yanan Yang, Long Chen, Hongqiang Ren, Wenli Tang
Photodegradation is critical to reduce the potent neurotoxic methylmercury (MeHg) in water and its subsequent accumulation along food chains. However, this process has been largely ignored in rice paddies, which are hotspots of MeHg production and receive about a quarter of the world's developed freshwater resources. Here, we reported that significant MeHg photodegradation, primarily mediated by hydroxyl radicals, occurs in the overlying water during rice growth. By incorporating field-measured light interception into a rice paddy biogeochemistry model, as well as photodegradation rates obtained from 42 paddy soils stretching ∼3500 km across China, we estimated that photodegradation reduced MeHg concentrations in paddy water and rice by 82 % and 11 %, respectively...
February 17, 2024: Water Research
https://read.qxmd.com/read/38382292/unveiling-the-inhibitory-mechanisms-of-chromium-exposure-on-microbial-reductive-dechlorination-kinetics-and-microbial-responses
#20
JOURNAL ARTICLE
Zheng-Tao Li, Xin Song, Songhu Yuan, He-Ping Zhao
Chromium and organochlorine solvents, particularly trichloroethene (TCE), are pervasive co-existing contaminants in subsurface aquifers due to their extensive industrial use and improper disposal practices. In this study, we investigated the microbial dechlorination kinetics under different TCE-Cr(Ⅲ/VI) composite pollution conditions and elucidated microbial response mechanisms based on community shift patterns and metagenomic analysis. Our results revealed that the reductive dechlorinating consortium had high resistance to Cr(III) but extreme sensitivity to Cr(VI) disturbance, resulting in a persistent inhibitory effect on subsequent dechlorination...
February 16, 2024: Water Research
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