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Impact of Biochar on Nitrogen-Cycling Functional Genes: A Comparative Study in Mollisol and Alkaline Soils.
Life (Basel)
December 2024
Heilongjiang Province Key Laboratory of Cold Region Wetland Ecology and Environment Research, Harbin University, Harbin 150086, China.
Biochar has gained considerable attention as a sustainable soil amendment due to its potential to enhance soil fertility and mitigate nitrogen (N) losses. This study aimed to investigate the effects of biochar application on the abundance of key N-cycling genes in Mollisol and alkaline soils, focusing on nitrification (AOA, AOB, and ) and denitrification (, , and ) processes. The experiment was conducted using soybean rhizosphere soil.
View Article and Find Full Text PDFHealth Risk Assessment of Occupational Exposures of Polycyclic Aromatic Hydrocarbons, Phthalates, and Semi-Volatile Chlorinated Organic Compounds in Urine of Commercial Fish Smokers, Ghana.
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December 2024
Department of Chemistry, School of Physical Science, University of Cape Coast, Cape Coast, Ghana.
Occupational exposure to smoke and polycyclic aromatic hydrocarbons (PAHs) poses significant health risks, especially for commercial fish smokers who are regularly exposed to high levels of smoke and particulate matter. This study aimed to evaluate the exposure levels and assess the health risks associated with PAHs, phenols, phthalates, and substituted benzenes among 155 fish smokers in Ghana. A total of 155 urine samples from fish smokers across selected coastal regions in Ghana were collected and analyzed.
View Article and Find Full Text PDFComparative analysis of niche adaptation strategies of AOA, AOB, and comammox along a gate-controlled river-estuary continuum.
Water Res
December 2024
College of Water Science, Beijing Normal University, Beijing 100875, PR China.
Ammonia oxidizers are key players in the biogeochemical nitrogen cycle. However, in critical ecological zones such as estuaries, especially those affected by widespread anthropogenic dam control, our understanding of their occurrence, ecological performance, and survival strategies remains elusive. Here, we sampled sediments along the Haihe River-Estuary continuum in China, controlled by the Haihe Tidal Gate, and employed a combination of biochemical and metagenomic approaches to investigate the abundance, activity, and composition of ammonia-oxidizing archaea (AOA), ammonia-oxidizing bacteria (AOB), and complete ammonia oxidizers (comammox).
View Article and Find Full Text PDFEcological distribution of ammonia oxidizers in Yellow River sediments and their influencing factors.
Environ Res
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Australian Centre for Water and Environmental Biotechnology (ACWEB, Formerly AWMC), The University of Queensland, St. Lucia, Queensland, 4072, Australia.
Ammonia oxidation, the first and rate-limiting step of nitrification, is a crucial step in nitrogen cycling. The distribution patterns of key ammonia oxidizers, including ammonia-oxidizing archaea (AOA) and bacteria (AOB), and comammox (complete ammonia oxidation) Nitrospira, provide vital insights for nitrogen cycling in natural ecosystems. Currently, the distribution and contribution of AOA, AOB and comammox Nitrospira in freshwater ecosystems remain largely underexplored.
View Article and Find Full Text PDFSolids retention time modulates nutrient removal in pilot-scale anaerobic-aerobic-anoxic process: Carbon allocation patterns and microbial insights.
Water Res
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Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China.
Anaerobic-aerobic-anoxic (AOA) process is a promising configuration to retrofit current wastewater treatment plants with intensified carbon utilization and nutrient removal, but lacks process optimization for scaling-up in real wastewater scenarios. Solids retention time (SRT) is a fundamental parameter of activated sludge process, but its roles in the AOA process remain vague. Here, we established a pilot-scale AOA process at different SRTs (10, 20, 30 d) to investigate the comprehensive responses and potential mechanisms.
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