Article
Engineering, Environmental
Nouran T. Bahgat, Philipp Wilfert, Leon Korving, Mark van Loosdrecht
Summary: The study assessed the recovery of phosphorus, nitrogen, methane, and extracellular polymeric substances (EPS) from aerobic granular sludge (AGS) wastewater treatment plants. About 30% of sludge organics are recovered as EPS and 25-30% as methane via alkaline anaerobic digestion (AD). It was found that a significant portion of phosphorus and nitrogen are present in EPS and can be recovered through chemical precipitation. Ammonium recovery is feasible from the AD centrate due to its high concentration.
Article
Engineering, Civil
Jicheng Zhong, Fanyan Yang, Min Zhang, Chuanzhe Sun, Shaoming Wang, Qiaoshen Chen, Hongwei Wang, Lei Zhang
Summary: This study investigated methane emissions and their temporal and spatial variations in three cascade reservoirs in northern China. The results showed that the three reservoirs were persistent sources of atmospheric methane during the ice-free period, with high spatial and temporal variability. The key drivers of methane emissions varied among the reservoirs.
JOURNAL OF HYDROLOGY
(2023)
Article
Multidisciplinary Sciences
Ahmed Fathy Yousef, Muhammad Moaaz Ali, Hafiz Muhammad Rizwan, Ahmed Gomaa Gad, Dangdi Liang, Li Binqi, Hazem M. Kalaji, Jacek Wrobel, Yong Xu, Faxing Chen
Summary: The type of light has an impact on graft union formation in tomato plants, with faster concrescence under R7:B3 light conditions; while red light application may delay vascular tissue differentiation.
SCIENTIFIC REPORTS
(2021)
Article
Multidisciplinary Sciences
Dan Wang, Weili Ye, Guangxue Wu, Ruoqi Li, Yuru Guan, Wei Zhang, Junxia Wang, Yuli Shan, Klaus Hubacek
Summary: This study aims to construct a greenhouse gas (GHG) emission inventory for wastewater treatment plants (WWTPs) in China to support their emission reduction efforts. The inventory includes CH4, N2O, and CO2 emissions from different treatment processes, energy consumption, and effluent discharge, covering the period from 2006 to 2019.
Article
Environmental Sciences
Xiangang Xu, Xinyue Zhong, Jiankai Dong, Donglai Xie, Wanlu Lu
Summary: Methane is a significant greenhouse gas and its emissions from the natural gas sector are often underestimated. This study used a mass balance approach to quantify methane emissions during the installation of natural gas meters and found a fat tail distribution in the emissions. The total methane emissions in China were substantial, with the highest emissions concentrated in the southeast. This research fills a gap in measuring methane emissions across the natural gas chain in China and provides data to support reduction targets and technologies.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Colby B. Francoeur, Brian C. McDonald, Jessica B. Gilman, Kyle J. Zarzana, Barbara Dix, Steven S. Brown, Joost A. de Gouw, Gregory J. Frost, Meng Li, Stuart A. McKeen, Jeff Peischl, Ilana B. Pollack, Thomas B. Ryerson, Chelsea Thompson, Carsten Warneke, Michael Trainer
Summary: This study provides an updated fuel-based oil and gas inventory, estimating NOx emissions from production in the contiguous US, and compares it with aircraft-derived emissions. The research shows good agreement between the bottom-up inventory and top-down aircraft-derived NOx emissions. It also suggests that NMVOC/NOx emissions from oil and gas basins may be three times higher than current estimates, potentially affecting how air quality models represent ozone formation downwind of oil and gas fields.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Environmental Sciences
Deborah Gordon, Frances Reuland, Daniel J. Jacob, John R. Worden, Drew Shindell, Mark Dyson
Summary: The net climate impact of gas and coal life-cycle emissions is affected by methane leakage and SO2 emissions. Gas systems with methane leakage rates above 4.7% (20-year timeframe) or 7.6% (100-year timeframe) are comparable to coal emissions from methane leaking coal mines. The impact of coal on climate is also influenced by SO2 emissions, which react to form sulfate aerosols that mask warming. Methane and SO2 co-emissions with CO2 alter the emissions parity between gas and coal. Detection and management of methane emissions are necessary to ensure that gas assets are less emissions intensive than coal.
ENVIRONMENTAL RESEARCH LETTERS
(2023)
Article
Plant Sciences
Golam Jalal Ahammed, Yue Chen, Chaochao Liu, Youxin Yang
Summary: This review explores the regulation of potassium uptake and utilization in plants by light, proposing potential mechanisms and highlighting the importance of light quality, intensity, and duration in potassium nutrition and crop quality. The study suggests that manipulating light signaling components and quality can enhance potassium utilization efficiency, providing a promising strategy for potassium management in crop production.
PLANT PHYSIOLOGY AND BIOCHEMISTRY
(2022)
Article
Environmental Sciences
Andrew L. Robison, Wilfred M. Wollheim, Clarice R. Perryman, Annie R. Cotter, Jessica E. Mackay, Ruth K. Varner, Paige Clarizia, Jessica G. Ernakovich
Summary: Inland waters, especially small streams, play a significant role in methane emissions to the atmosphere. This study investigates the emission pathways, microbial production and oxidation, and isotopic signature of methane in four lowland headwater streams. The findings suggest that diffusive emissions account for the majority of methane emissions in these streams, and methane oxidation is prevalent, depleting half of the dissolved methane pool. The study proposes a conceptual model of methane production, oxidation, and emission in small streams, highlighting their unique characteristics compared to other aquatic ecosystems.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Article
Ecology
Catarina S. C. Martins, Loic Nazaries, Manuel Delgado-Baquerizo, Catriona A. Macdonald, Ian C. Anderson, Brajesh K. Singh
Summary: The free-air carbon dioxide enrichment (FACE) experiments have shown the ecological responses of key ecosystem processes to rising atmospheric carbon dioxide (CO2), but rarely included methane (CH4) and nitrous oxide (N2O) responses, particularly in natural and mature forests. This study aimed to capture the long-term temporal dynamics of CH4 and N2O fluxes under elevated CO2 (+150 ppm) in a mature dryland Eucalypt forest in Australia. The findings highlight the reduction in CH4 sink and overall decrease in N2O emissions under elevated CO2, with soil moisture, rainfall, and pH being the main predictors of net CH4 and N2O emissions.
FUNCTIONAL ECOLOGY
(2021)
Article
Environmental Sciences
Wei Chen, Qian Zhang, Lulu Hu, Yong Geng, Chengqing Liu
Summary: This study estimated greenhouse gas (GHG) emissions from wastewater treatment plants (WWTPs) at the country scale using a life cycle assessment method. The results showed that the GHG emissions varied among different WWTPs, with a national average of 0.88 kg CO2 eq/m3. Policy suggestions, such as adjusting the electricity grid and improving treatment efficiency, were recommended to reduce GHG emissions.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2023)
Article
Multidisciplinary Sciences
Hongfang Lu, Zhao-Dong Xu, Y. Frank Cheng, Haoyan Peng, Dongmin Xi, Xinmeng Jiang, Xin Ma, Jun Dai, Yuli Shan
Summary: Natural gas pipelines can contribute to significant greenhouse gas emissions in the form of methane and carbon dioxide. However, these emissions are not accounted for in regular inventories, leading to an inaccurate representation of the actual greenhouse gas amounts. This study establishes a comprehensive inventory framework for greenhouse gas emissions from natural gas pipeline incidents in the United States and Canada, covering multiple states and regions over several decades. These datasets are crucial for improving emission inventories and informing climate-oriented pipeline integrity management.
Article
Thermodynamics
Ruonan Li, Prashant Mhaskar, Vladimir Mahalec
Summary: This paper optimizes the design and operation of integrated distributed energy systems in large buildings and light industrial plants to reduce greenhouse gas emissions and decrease costs. The study found a sharp optimum point near the size of the confectionary plant that maximizes GHG reductions and minimizes costs.
Article
Multidisciplinary Sciences
Piyush Bhardwaj, Rajesh Kumar, Douglas A. Mitchell, Cynthia A. Randles, Nicole Downey, Doug Blewitt, Branko Kosovic
Summary: This study evaluates the effectiveness of current satellite observing systems in detecting methane point sources from typical oil and gas production facilities. The study uses a microscale model to generate a high-resolution methane concentration dataset. The results show that increasing the pixel resolution enhances the detectability of plumes, but changes in emission rates at the surface have minimal impact on the retrieved methane column.
SCIENTIFIC REPORTS
(2022)
Article
Geochemistry & Geophysics
Thomas Giunta, Edward D. Young, Jabrane Labidi, Pierre Sansjofre, Didier Jezequel, Jean-Pierre Donval, Christophe Brandily, Livio Ruffine
Summary: Microbial methane oxidation plays a crucial role in the global methane budget on Earth, and the isotopic signatures of methane can be used to track both aerobic and anaerobic methanotrophy. This study investigates the isotopic compositions in two different methanotrophic environments, Lake Pavin and Black Sea sediments, and reveals distinct isotopic fractionation patterns between aerobic and anaerobic methanotrophy.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)