Article
Engineering, Environmental
Guining Wei, Ruoyu Yuan, Muhammad Salam, Lixue Zhang, Yanyan Wei, Bingran Tang, Xiaobing Yuan, Bingsheng Liu, Xianhuai Yu, Hong Li, Xiaojun Miao
Summary: The use of oxygen-loaded lanthanum modified zeolites (LOZ) can effectively absorb phosphorus and nitrogen from lake sediments, while improving dissolved oxygen levels and reducing the release of these nutrients into the overlying water. This approach provides a quick, efficient, and sustainable remediation method for polluted water systems.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Analytical
Marcelo Bevilacqua Remor, Marcio Antonio Vilas Boas, Silvio Cesar Sampaio, Sandra Regina Damatto, Jose Candido Stevaux, Ralpho Rinaldo dos Reis
Summary: The objective of this study was to reconstruct the history of sedimentation and nutrient accumulation in the Upper Parana River floodplain. The research found that flood pulses were the main regulating factor of sedimentation rate, and nitrogen was the limiting nutrient for productivity in the system.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2022)
Article
Microbiology
Sophie Rabouille, Lauralie Tournier, Solange Duhamel, Pascal Claquin, Olivier Crispi, Amelie Talec, Angela Landolfi, Andreas Oschlies
Summary: Considering the phosphate limitation in open-ocean regions, this study explores the ability of diazotrophs to use alternative sources of phosphorus for growth. The results show that Crocosphaera watsonii can grow efficiently on organic phosphorus as the sole P source, and survival of the population on phytic acid. It is also found that alkaline phosphatase activity is not a suitable proxy to estimate the growth yields of organisms using organic phosphorus. The findings of this study are important for improving and calibrating mathematical models of diazotrophic growth and distribution in the global ocean.
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Engineering, Environmental
Beat Mueller, Joseph S. Meyer, Rene Gachter
Summary: The nitrogen cycle in Swiss lakes is affected by various factors, with nitrate concentration, external nitrogen load, and hydraulic loading rate being key predictors of denitrification rates. Net sedimentation of nitrogen is strongly related to total phosphorus concentration. Nitrogen removal efficiency is negatively correlated with hydraulic loading rate. These findings highlight the importance of nitrogen management alongside phosphorus management in order to protect lake water quality.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Environmental Sciences
B. C. Webster, M. N. Waters, S. W. Golladay
Summary: Reservoirs, commonly found along rivers, provide a multitude of ecosystem services such as sequestering sediments and nutrients. Studies need to focus on understanding how reservoirs function individually and as part of sequences within large rivers and watersheds. Further research is needed to explore the impacts of reservoirs on nutrient deposition and their interactions within watershed-sediment-transport systems.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Shu Xu, Jingfu Wang, Dengjun Wang, Peng Liao, Xinping Hu, Yongqiong Yang, Jingan Chen
Summary: Black-odorous water is a common problem in urban rivers worldwide. This study developed oxygen-loaded adsorbents and investigated their ability to aerate and remove various pollutants in black-odorous water. The results showed that these materials effectively increased dissolved oxygen concentration, reduced phosphate, ammonia nitrogen, and total nitrogen levels, and were influenced by microbial activity. The findings provide potential engineering applications for rapid treatment of urban black-odorous water.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Sterling B. Tebbett, Jodie A. Schlaefer, Casey L. Bowden, William P. Collins, Christopher R. Hemingson, Scott D. Ling, Juliano Morais, Renato A. Morais, Alexandre C. Siqueira, Robert P. Streit, Sam Swan, David R. Bellwood
Summary: Sediments on coral reefs are influenced by the amount and movement of sediment in different reservoirs. However, research on reef sediment dynamics and their drivers is limited, especially on clear-water offshore reefs. Using quantification methods, this study examined sediment reservoirs/processes and bio-physical drivers in different reef habitats at Lizard Island on the Great Barrier Reef. The findings showed that a significant amount of suspended sediment passed over the reef, but only a small portion settled. Spatial differences in sediment deposition and accumulation were observed, influenced by wave energy and reef geomorphology. These findings highlight the importance of local hydrodynamic conditions in determining sediment fate on coral reefs.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Ecology
S. W. Duiker, S. Richards
Summary: Cover cropping is a cost-effective practice to reduce nutrient losses in cropland. In Pennsylvania's Chesapeake Bay watershed, cover crops were used on 39% of the annual crop area, higher than the US average. However, commodity cover crops are not currently included in the Chesapeake Bay Model for nutrient reduction credits.
JOURNAL OF SOIL AND WATER CONSERVATION
(2023)
Article
Ecology
Mohammed A. Ghandourah, Mohammad I. Orif, Radwan K. Al-Farawati, Mohammad S. El-Shahawi, Ramadan H. Abu-Zeid
Summary: The current study investigates the oxygen loss in two coastal lagoons near the eastern Red Sea due to the input of organic waste and the increasing population migration trend towards the coastline region. The quantity of organic matter and water column mixing are the main environmental factors controlling the transition from oxic to suboxic and anoxic conditions in the marine environment. Samples were collected from Al-Shabab and Al-Arbaeen lagoons during the summers and winters of 2017 and 2018. The distribution of dissolved oxygen (DO) and total organic carbon (TOC) in both lagoons shows a clear correlation between high TOC levels and oxygen consumption.
REGIONAL STUDIES IN MARINE SCIENCE
(2023)
Article
Agronomy
Hongyu Li, Lihong Wang, Zuowei Zhang, Aizheng Yang, Deping Liu
Summary: This study investigated the effects of phosphorus on nodule nitrogen fixation and nitrogen accumulation in soybeans under sand culture conditions. The results showed that different growth stages of soybean nodules have different requirements for phosphorus supply levels, and the nitrogen supply in different parts of soybean also varies with different growth periods and phosphorus supply concentrations.
Article
Geosciences, Multidisciplinary
Agnes Rostasi, Kornel Racz, Melinda A. Fodor, Boglarka Topa, Zsombor Molnar, Tamas G. Weiszburg, Mihaly Posfai
Summary: This study characterized the formation of modern carbonate sediments in Lake Balaton, Hungary, and found that mineral particles from tributaries and the atmosphere made up a small fraction of the sediment, with autochthonous carbonate being the main contributor. The study also revealed variations in magnesium content in calcite and the presence of dolomite, which had different sources in the lake. The findings provide insights into sediment formation and the retention and release of nutrients by sediment minerals.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Environmental Sciences
Xinxin Zhang, Xianzhong Ke, Yao Du, Yanqiu Tao, Jiangkai Xue, Qinghua Li, Xianjun Xie, Yamin Deng
Summary: The biodegradation of organic matter and the dissolution of iron oxides play important roles in the release of geogenic phosphorus to groundwater. However, the combined effects of natural organic matter and iron oxides on phosphorus mobilization are not well understood. This study investigates sediment samples from boreholes in the Central Yangtze River Basin and finds that sediments with high phosphorus levels contain more bioavailable phosphorus, particularly iron oxide bound phosphorus and organic phosphorus, compared to sediments with low phosphorus levels. The study also reveals the formation of stable phosphorus-iron-organic matter complexes that inhibit the dissolution of iron oxides and the degradation of organic matter, thereby limiting phosphorus mobilization.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
R. W. McDowell, K. A. Macintosh, C. Depree
Summary: Intensive land use, such as dairying, can impact water quality, but there is limited data on the success of implementing best management practices (BMPs) on-farm. A study in New Zealand found that water quality trend directions were either improving or showing no change during an extension period, but some contaminant concentrations did not meet regulatory threshold values, indicating the need for further action.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Xiaolong Yao, Runnan Ding, Yongqiang Zhou, Zhengwen Wang, Yanan Liu, Dafang Fu, Lu Zhang
Summary: This study explores the links among substrates, microbial processes, and the release of internal nutrient pools in shallow lakes. The results show that sediment organic matter properties play a crucial role in driving nitrogen transformation rates, with mineralization of organic matter positively affecting nutrient fluxes.
Article
Geosciences, Multidisciplinary
Genevieve L. L. Noyce, Alexander J. J. Smith, Matthew L. L. Kirwan, Roy L. L. Rich, J. Patrick Megonigal
Summary: In a four-year field manipulation study in a coastal wetland, researchers found that elevated CO2 combined with warming reduced the rate of carbon accumulation due to increased plant-mediated oxygen flux and subsequent aerobic decomposition. Surprisingly, the combination of elevated CO2 and warming also reduced net methane emissions. These findings highlight the importance of plant traits in mediating ecosystem responses to interacting facets of global change.
Article
Limnology
Robert Schwefel, Thomas Steinsberger, Damien Bouffard, Lee D. Bryant, Beat Mueller, Alfred Wuest
LIMNOLOGY AND OCEANOGRAPHY
(2018)
Article
Environmental Sciences
Ondra Sracek, Michael Berg, Beat Muller
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2018)
Article
Environmental Sciences
Vincent Nouchi, Tiit Kutser, Alfred Wuest, Beat Mueller, Daniel Odermatt, Theo Baracchini, Damien Bouffard
Article
Environmental Sciences
Robert Schwefel, Beat Mueller, Helene Boisgontier, Alfred Wuest
Article
Multidisciplinary Sciences
Thomas Steinsberger, Beat Mueller, Christoph Gerber, Babak Shafei, Martin Schmid
Article
Multidisciplinary Sciences
Beat Muller, Thomas Steinsberger, Robert Schwefel, Rene Gachter, Michael Sturm, Alfred Wuest
SCIENTIFIC REPORTS
(2019)
Article
Environmental Sciences
Beat Mueller, Joseph S. Meyerz, Rene Gaechter
Article
Limnology
Thomas Steinsberger, Robert Schwefel, Alfred Wueest, Beat Mueller
LIMNOLOGY AND OCEANOGRAPHY
(2020)
Article
Environmental Sciences
Beat Mueller, Raoul Thoma, Kathrin B. L. Baumann, Cameron M. Callbeck, Carsten J. Schubert
Summary: Freshwater lakes play a crucial role in removing excessive anthropogenic nitrogen loads before they reach coastal oceans. The study found that eutrophic lakes are more effective at removing nitrogen compared to oligotrophic lakes, with factors such as historic nitrogen loads, nitrate concentration, and seasonal oxygen fluxes influencing the removal rates. Increasing oxygen levels stimulate sediment mineralization and nitrification, ultimately enhancing denitrification activity in eutrophic lakes.
Article
Engineering, Environmental
Beat Mueller, Thomas Steinsberger, Arno Stoeckli, Alfred Wueest
Summary: This research explored the relationship between carbon-to-phosphorus ratios in suspended particles and changing productivity in lakes undergoing reoligotrophication. The findings suggest that the (C:P)(epi) ratio can indicate a reduction in productivity before traditional indicators like deep-water oxygen depletion. Lake Hallwil exhibited three distinct phases during its recovery from eutrophic conditions, providing insights into the dynamics of ecosystem production.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Environmental
Beat Mueller, Joseph S. Meyer, Rene Gachter
Summary: The nitrogen cycle in Swiss lakes is affected by various factors, with nitrate concentration, external nitrogen load, and hydraulic loading rate being key predictors of denitrification rates. Net sedimentation of nitrogen is strongly related to total phosphorus concentration. Nitrogen removal efficiency is negatively correlated with hydraulic loading rate. These findings highlight the importance of nitrogen management alongside phosphorus management in order to protect lake water quality.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Microbiology
Kathrin B. L. Baumann, Raoul Thoma, Cameron M. Callbeck, Robert Niederdorfer, Carsten J. Schubert, Beat Mueller, Mark A. Lever, Helmut Buergmann
Summary: The nitrogen cycle is crucial for global ecosystems, and excessive use of nitrogen fertilizers can harm aquatic ecosystems. However, the microbial communities involved in nitrogen removal in freshwater lake sediments are poorly understood. This study investigates the abundance of microbial nitrogen transformation genes in two lakes with contrasting trophic states and demonstrates the importance of understanding the genomic potential for nitrogen transformation in interpreting nitrogen process rates.
Article
Environmental Sciences
Alfred Wueest, Issa, Christian Dinkel, Michael Halbwachs, Beat Mueller
Summary: Lake Nyos in Cameroon is a deep crater lake with permanent stratification due to subaquatic sources. In 2002, cooling triggered the formation of a double-diffusive staircase which lasted for about 850 days.
ENVIRONMENTAL FLUID MECHANICS
(2023)
Correction
Engineering, Environmental
Beat Mueller, Joseph S. Meyer, Rene Gachter
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)