Article
Engineering, Environmental
Christian Zerfass, Robert Lehmann, Nico Ueberschaar, Carlos Sanchez-Arcos, Kai Uwe Totsche, Georg Pohnert
Summary: Understanding the composition, transport and evolution of dissolved organic matter in groundwater is crucial for its protection and sustainable use. Groundwater metabolomics provides valuable insights into the response of groundwater ecosystems to external impacts and the effects of recharge dynamics.
Article
Engineering, Environmental
Jennifer Pensky, Andrew T. Fisher, Galen Gorski, Nicole Schrad, Victor Bautista, Chad Saltikov
Summary: We conducted laboratory column studies to investigate the impacts of infiltration dynamics and the addition of carbon amendments on water quality during flood-managed aquifer recharge (flood-MAR). Our results show that the presence of carbon amendments, such as wood mulch or almond shells, increases nitrate removal compared to native soil. Almond shells promote more efficient nitrate removal but also lead to the mobilization of geogenic trace metals, indicating the importance of considering the carbon source and potential impacts on solute dynamics when designing MAR systems.
Article
Environmental Sciences
Yang Liu, Jia Xin, Yuan Wang, Zhixiang Yang, Shixuan Liu, Xilai Zheng
Summary: This study investigates the effects of different types of dissolved organic nitrogen (DON) on nitrate accumulation in groundwater and reveals the complex roles DON plays in nitrogen cycling processes. The researchers established quantitative correlations between microbial indicators and nitrogen content. The findings provide guidance for environmental risk evaluation and control strategies for nitrate pollution in groundwater.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Review
Geosciences, Multidisciplinary
Magdalena Diak, Michael Ernst Boettcher, Catia Milene Ehlert von Ahn, Wei-Li Hong, Monika Kedra, Lech Kotwicki, Katarzyna Koziorowska-Makuch, Karol Kulinski, Aivo Lepland, Przemyslaw Makuch, Arunima Sen, Aleksandra Winogradow, Marc Juergen Silberberger, Beata Szymczycha
Summary: This study reviews the interactions between permafrost and groundwater, with a focus on recharge and discharge in the Arctic and the Qinghai-Tibet Plateau. It found that the geochemical composition of groundwater is site-specific and varies within aquifers, reflecting water-rock interactions. The study also observed that permafrost thaw increases groundwater discharge on land, and climate warming is likely to accelerate permafrost degradation and enhance hydrological connectivity. With regards to submarine groundwater discharge, the impact of permafrost thaw can either reinforce or reduce it, depending on the changes in aquifer pressure. The study highlights the need for long-term interdisciplinary in situ measurements for accurate predictions of groundwater flow and permafrost dynamics in a warmer climate.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geochemistry & Geophysics
Thomas Riedel, Christine Kuebeck, Markus Quirin
Summary: Denitrification in soils and aquifers can reduce nitrate concentrations in anaerobic groundwater and is an important ecosystem service. However, denitrification may also lead to trace metal contamination. This study quantified the potential health risk from denitrification-associated trace metal pollution in anaerobic groundwater in Northern Germany. The results showed that denitrification increased the risk of violations of drinking water standards for certain trace metals but reduced the risk for others. The study also developed a method to accurately identify denitrification using oxygen and nitrate concentrations.
APPLIED GEOCHEMISTRY
(2022)
Article
Environmental Sciences
Elad Levintal, Laibin Huang, Cristina Prieto Garcia, Adolfo Coyotl, Matthew W. Fidelibus, William R. Horwath, Jorge L. Mazza Rodrigues, Helen E. Dahlke
Summary: Agricultural managed aquifer recharge (Ag-MAR) has been receiving increased attention as a method to intentionally recharge groundwater by flooding farmland with excess surface water. However, concerns about nitrate (NO3-) contamination, greenhouse gas emissions, and crop tolerance to prolonged flooding remain. This study conducted a large-scale experiment to assess the effects of Ag-MAR on soil nitrogen biogeochemical transformations, nitrate leaching, soil conditions, and crop yield. The results showed that nitrate leaching was the dominant nitrogen loss pathway, and prolonged flooding led to a significant decrease in crop yield.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Felix Ortmeyer, Marco Alexandre Guerreiro, Dominik Begerow, Andre Banning
Summary: The worldwide environmental nitrate problem is gaining increasing attention due to agricultural inputs and decreasing degradation capacity in aquifers. Treatment methods are becoming more important. This study investigated the effects of enhanced denitrification with addition of organic carbon on microbiology at different temperatures. The addition of substrates resulted in major differences in microbial community, and cooling to 10 degrees C further changed the microbiology. The denitrification rates strongly depend on the temperature effect and the microbiology.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Kai Xiao, Peng Zhang, Isaac R. Santos, Jun-Jian Wang, Zhenyang Li, Xuejing Wang, Ying-Hui Wang, Meiqing Lu, Licong Zhang, Hailong Li
Summary: Dissolved organic matter (DOM) in highly productive intertidal mangroves plays a significant role as a carbon and nutrient source in the coastal ocean. The influence of groundwater flow on DOM properties and fluxes remains poorly understood. This study highlights the importance of tidal hydrology in controlling groundwater DOM characteristics.
WATER RESOURCES RESEARCH
(2023)
Article
Multidisciplinary Sciences
Alan M. Seltzer, Jessica Ng, Werner Aeschbach, Rolf Kipfer, Justin T. Kulongoski, Jeffrey P. Severinghaus, Martin Stute
Summary: Analysis and modeling of noble gases in groundwater demonstrate that the mean annual surface temperatures of low-altitude, low-to-mid-latitude land masses were about 6 degrees Celsius cooler during the Last Glacial Maximum compared to the Late Holocene.
Article
Geosciences, Multidisciplinary
David N. Dralle, W. Jesse Hahm, Daniella M. Rempe
Summary: Accurate observation of hillslope groundwater storage and instantaneous recharge remains difficult due to limited monitoring and complex mountainous landscapes. A novel storage-discharge method is introduced to estimate hillslope recharge and recharge ratio, which relies on streamflow data and is validated with independent measurements. The method offers valuable insights into controls on groundwater recharge, enhancing our understanding of a critical flux in the hydrologic cycle.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Tuvia Turkeltaub, Alex Furman, Ron Mannheim, Noam Weisbrod
Summary: Soil aquifer treatment (SAT) is a tertiary process for wastewater treatment, where wastewater is purified and stored in the underneath aquifer by infiltrating through a vadose zone. This study continuously monitored the physico-chemical conditions of the SAT vadose zone, including redox potential, water content, temperature, and oxygen levels, and found that the length of wetting and drying stages should be defined separately to achieve optimal efficiency. The study also highlighted the reduction in drainage capabilities during long wetting stages in winter.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2022)
Article
Environmental Sciences
Xu Cao, Wei He, Mengqing Fan, Wei He, Yuanyuan Shi, Tongyan An, Xiaorui Chen, Zhanhao Zhang, Fei Liu, Yi Zhao, Pengpeng Zhou, Cuibai Chen, Jiangtao He
Summary: This study evaluated the impact of anthropogenic groundwater recharge (AGR) on the composition and sources of dissolved organic matter (DOM) in groundwater. It found that the fluorescent indices C1%, C2%, and C3% were more sensitive to AGR, indicating significant differences between artificially recharged groundwater and naturally recharged groundwater. The study also identified the optimal dual index BIX-C1% for end-member mixing analysis (EMMA) of groundwater DOM. The results showed that AGR significantly changed the native DOM in groundwater and that surface water contributed more DOM to AGR groundwater compared to natural groundwater recharge. This study provides important insights into the quantitative source apportionment of DOM in groundwater under long-term AGR.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Geosciences, Multidisciplinary
Tibor Y. Stigter, Jodie Miller, Jianyao Chen, Viviana Re
Summary: This review explores the important role of groundwater in adapting to climate change and evaluates the competing threats and opportunities posed by climate change to groundwater systems. It reviews current thinking on the complex interactions between human activities, climate, and the hydrological cycle that affect groundwater quantity and quality across different regions and time scales.
HYDROGEOLOGY JOURNAL
(2023)
Article
Environmental Sciences
E. Carol, M. J. Galliari, L. Santucci, F. Nunez, M. Faleschini
Summary: In coastal wetlands, groundwater flows are crucial for the establishment and nutrient transport. This study analyzes the impact of groundwater discharge on the dynamics of dissolved nutrients in the Punta Rasa Natural Reserve. A monitoring network was used to determine groundwater flows and sample dissolved N and P species. The presence of sandy sediments in all environments creates homogeneous aquifers. Fresh to brackish groundwater flows from dunes and beach ridges to marshes and coastal lagoons, contributing nutrients derived from organic degradation and possibly atmospheric sources. Nitrification dominates under oxidizing conditions, while phosphorus is mainly retained in sediments. Groundwater discharge provides dissolved nutrients, especially NO3-, to the wetlands, but it is limited due to low hydraulic gradient and oxidizing conditions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Xianjiang Zeng, Yaxin Zheng, Xiaorui Chen, Xu Cao, Wei He, Bin Jiang, Binghua Li, Huaming Guo
Summary: This study used Fourier transform ion cyclotron resonance mass spectrometry to investigate the molecular characteristics of dissolved organic matter (DOM) in groundwater from reclaimed water and natural water recharge areas. The results showed that the groundwater from reclaimed water areas had fewer nitrogenous compounds, more sulfur-containing compounds, higher concentrations of nitrate-nitrogen, and lower pH than the groundwater from natural water recharge areas. This study also found that the intensities of common molecules in all samples were significantly correlated with water quality and fluorescent indicators, suggesting their potential for tracking the environmental impact of anthropogenic groundwater recharge.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Oceanography
Beata Szymczycha, Zaneta Klostowska, Monika Lengier, Lidia Dzierzbicka-Glowacka
Article
Oceanography
Monika Lengier, Beata Szymczycha, Aleksandra Brodecka-Goluch, Zaneta Klostowska, Karol Kulinski
Summary: This study investigated the potential release of dissolved inorganic carbon, dissolved organic carbon, ammonium, and phosphates from Baltic Sea sediments. Results showed a high spatial variability in the release of these substances in the Baltic Sea, influenced by oxygen concentrations in the water column and inflows.
Article
Limnology
Thomas W. Brooks, Kevin D. Kroeger, Holly A. Michael, Joanna K. York
Summary: Nutrient loads delivered to estuaries via submarine groundwater discharge play a key role in the nitrogen budget and eutrophication status. Biogeochemical transformations within reactive estuarine surface sediment are a dominant driver in modifying the nitrogen flux carried upward by SGD. Seasonal shifts in the relative importance of biogeochemical processes alter the composition of the flux to estuarine surface water.
LIMNOLOGY AND OCEANOGRAPHY
(2021)
Article
Marine & Freshwater Biology
Zuzanna Borawska, Beata Szymczycha, Marc J. Silberberger, Katarzyna Koziorowska-Makuch, Marta Szczepanek, Monika Kedra
Summary: Spatial and seasonal changes in benthic fluxes of dissolved silica (DSi) were investigated in the southern Baltic Sea. The study found that sediments with high mud content had the highest fluxes in autumn, while sandy sediments showed no clear seasonal patterns. Biological factors were key explanatory variables in shallow enclosed areas, while environmental factors played a larger role in open areas. The study also highlighted the importance of benthic fluxes in the marine Si cycle.
ESTUARINE COASTAL AND SHELF SCIENCE
(2022)
Article
Biology
Anna Piwoni-Piorewicz, Stanislav Strekopytov, Emma Humphreys-Williams, Jens Najorka, Beata Szymczycha, Piotr Kuklinski
Summary: Biomineralization plays a crucial role in ecosystem functioning and the use of carbonate skeleton as environmental proxies. This study investigated the influence of salinity on mineral type and chemical element concentrations in the skeletons of invertebrates from the Baltic Sea. The results showed that both environmental parameters and biological mechanisms contribute to skeletal formation, and the concentrations of different elements varied between species and with increasing salinity. This study emphasizes the importance of both biological and environmental factors in shaping the composition of calcifying organisms' skeletons.
Article
Biodiversity Conservation
Rebecca Sanders-DeMott, Meagan J. Eagle, Kevin D. Kroeger, Faming Wang, Thomas W. Brooks, Jennifer A. O'Keefe Suttles, Sydney K. Nick, Adrian G. Mann, Jianwu Tang
Summary: Saline tidal wetlands are important for carbon sequestration, but management interventions can restrict tidal exchange, causing freshening and impoundment, which affect vegetation shifts and carbon balance. Understanding controls and scaling of carbon exchange in these ecosystems is crucial for climate restoration and management.
GLOBAL CHANGE BIOLOGY
(2022)
Article
Green & Sustainable Science & Technology
Alan D. Steinman, Donald G. Uzarski, David P. Lusch, Carol Miller, Patrick Doran, Tom Zimnicki, Philip Chu, Jon Allan, Jeremiah Asher, John Bratton, Don Carpenter, Dave Dempsey, Chad Drummond, John Esch, Anne Garwood, Anna Harrison, Lawrence D. Lemke, Jim Nicholas, Wendy Ogilvie, Brendan O'Leary, Paul Sachs, Paul Seelbach, Teresa Seidel, Amanda Suchy, John Yellich
Summary: Groundwater is a critical but often overlooked natural resource. In the Laurentian Great Lakes region, where surface water is abundant, groundwater resources have received limited attention. To address this issue, a virtual groundwater summit was held in 2021 to identify challenges and develop solutions.
Article
Environmental Sciences
Joanna C. Carey, Kevin D. Kroeger, Jianwu Tang
Summary: Salt marsh habitats are important reservoirs of soil organic carbon. The study found that the summer period is the most dynamic for marsh C gas exchange, with substantial fluxes also observed from early summer through late fall. Temperature and elevation were found to significantly impact ecosystem respiration rates.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2022)
Review
Oceanography
Katarzyna Koziorowska-Makuch, Beata Szymczycha, Helmuth Thomas, Karol Kulinski
Summary: This study investigated the spatial variability in hydrography and carbonate chemistry in four Spitsbergen fjords during the high meltwater season. The results showed that the differences in hydrology led to spatial changes in the CO2 system structure. The freshwater input had a diluting effect and lowered the alkalinity in the surface waters of the fjords. The study also highlighted the importance of recognizing the variability in alkalinity and freshwater end-members in predicting marine CO2 system changes.
PROGRESS IN OCEANOGRAPHY
(2023)
Article
Limnology
Shuzhen Song, Zhaohui Aleck Wang, Kevin D. Kroeger, Meagan Eagle, Sophie N. Chu, Jianzhong Ge
Summary: This study estimates the variability of partial pressure of CO2 (pCO(2)) and air-water CO2 fluxes over summer and fall of 2014 and 2015 using high-frequency measurements. The results show that CO2 effluxes from the tidal creek and tidally-inundated vegetated platform varied monthly and accounted for a dominant portion of total CO2 effluxes in the inundated marsh. Photosynthesis in tidal water substantially reduced the CO2 evasion.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Article
Environmental Sciences
Beata Szymczycha, Michael Ernst Boettcher, Magdalena Diak, Katarzyna Koziorowska-Makuch, Karol Kulinski, Przemyslaw Makuch, Catia Milene Ehlert von Ahn, Aleksandra Winogradow
Summary: The influence of hypoxic submarine groundwater discharge on the carbonate system of coastal seawater is still poorly understood. This study investigates the production of dissolved inorganic carbon and alkalinity in coastal sediments under the impact of oxygen-deficient SGD. It finds that SGD can potentially contribute to ocean acidification and affect the functioning of calcifying invertebrates.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
James R. Holmquist, Meagan Eagle, Rebecca Lee Molinari, Sydney K. Nick, Liana C. Stachowicz, Kevin D. Kroeger
Summary: This study provides a new assessment of methane reduction opportunities in coastal wetlands in the contiguous United States. The researchers combine multiple map layers, reassess greenhouse gas emissions datasets, and apply geospatial information system and coastal manager surveys to inform their scenarios. They find that restorations of freshwater-impounded wetlands to brackish or saline conditions have the greatest potential climate benefit, but are less common compared to other conversion events.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)
Article
Ecology
Damian L. Arevalo-Martinez, Amir Haroon, Hermann W. Bange, Ercan Erkul, Marion Jegen, Nils Moosdorf, Jens Schneider von Deimling, Christian Berndt, Michael Ernst Boettcher, Jasper Hoffmann, Volker Liebetrau, Ulf Mallast, Gudrun Massmann, Aaron Micallef, Holly A. Michael, Hendrik Paasche, Wolfgang Rabbel, Isaac Santos, Jan Scholten, Katrin Schwalenberg, Beata Szymczycha, Ariel T. Thomas, Joonas J. Virtasalo, Hannelore Waska, Bradley A. Weymer
Summary: For thousands of years, humans have been attracted to coastlines for their resource potential and as geopolitical centers. The supply and demand of potable water are crucial for water security in coastal communities, but the interaction between freshwater and saltwater in coastal settings is complicated by natural and human-driven environmental changes. Understanding groundwater fluxes across the land-sea continuum is important for (bio)geochemical budgets and the potential use of offshore freshened groundwater as a resource. Assessing land-ocean connectivity through groundwater requires a multidisciplinary approach and is relevant for climate change, pollution, and sustainable development goals.
Review
Geosciences, Multidisciplinary
Karol Kulinski, Gregor Rehder, Eero Asmala, Alena Bartosova, Jacob Carstensen, Bo Gustafsson, Per O. J. Hall, Christoph Humborg, Tom Jilbert, Klaus Juergens, H. E. Markus Meier, Barbel Muller-Karulis, Michael Naumann, Jorgen E. Olesen, Oleg Savchuk, Andreas Schramm, Caroline P. Slomp, Mikhail Sofiev, Anna Sobek, Beata Szymczycha, Emma Undeman
Summary: This paper reviews the biogeochemical functioning of the Baltic Sea and its impact on the ecological status. The Baltic Sea has undergone significant changes in recent decades, and the reduction in nutrient loads has not yet resulted in improved oxygen availability due to the low burial efficiency of phosphorus. The assessment also highlights the knowledge gaps and future research needs in marine biogeochemistry in the Baltic Sea.
EARTH SYSTEM DYNAMICS
(2022)
Review
Geosciences, Multidisciplinary
Marcus Reckermann, Anders Omstedt, Tarmo Soomere, Juris Aigars, Naveed Akhtar, Magdalena Beldowska, Jacek Beldowski, Tom Cronin, Michal Czub, Margit Eero, Kari Petri Hyytiainen, Jukka-Pekka Jalkanen, Anders Kiessling, Erik Kjellstrom, Karol Kulinski, Xiaoli Guo Larsen, Michelle McCrackin, H. E. Markus Meier, Sonja Oberbeckmann, Kevin Parnell, Cristian Pons-Seres de Brauwer, Anneli Poska, Jarkko Saarinen, Beata Szymczycha, Emma Undeman, Anders Worman, Eduardo Zorita
Summary: Human activities heavily impact coastal environments like the Baltic Sea region, with various factors both naturally occurring and completely human-induced. Climate change is seen as an overarching factor that influences other aspects, acting as a background effect.这部分内容已经被简化成了英文。
EARTH SYSTEM DYNAMICS
(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.