Insights into efficiency of sulphate reduction and microbial community in suspended fillers sequencing batch anaerobic biosystems under nutrient-poor conditions

Environmental Technology, Journal Year: 2025, Volume and Issue: unknown, P. 1 - 12

Published: March 27, 2025

Anaerobic biological treatment of sulphate - laden wastewater has been proven to be a feasible approach. However, it encounters formidable challenges when applied under nutrient poor conditions. The efficacy suspended fillers in augmenting microbial concentrations and enhancing the removal contaminants had empirically validated. there is limited research on enhancement by fillers, mechanism remains unclear. Thus, fill anaerobic bioreactor systems were established investigate its feasibility nutrient-poor conditions, mechanisms further explored. findings demonstrated that presence enabled achieve efficiency approximately 68.9%, even organic load rate was as low 0.08 gCOD·(L·d)-1. Principal Coordinates Analysis results clearly differences community composition between sludge filler samples at each stage (R > 0, P < 0.05). Further analysis revealed Desulfobulbus Desulfobacter, which closely associated with removal, exhibited higher relative abundances compared samples. Furthermore, functional genes found exhibit more pronounced expression sample fillers. These suggested creates favourable environment for certain microorganisms, particularly some sulphate-reducing bacteria, activity increasing efficiency.

Language: Английский

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Exploring Anaerobic Membrane Bioreactors for Sustainable Wastewater Treatment: Performance Assessment and Emerging Challenges

European Journal of Theoretical and Applied Sciences, Journal Year: 2025, Volume and Issue: 3(3), P. 76 - 88

Published: April 25, 2025

Anaerobic membrane bioreactors (AnMBRs) have become recognised as a promising technology for wastewater treatment due to their advantages over conventional aerobic systems, including lower energy consumption, reduced sludge production and biogas production. However, despite extensive research on AnMBRs, there is lack of comprehensive reviews that evaluates strengths challenges, particularly in optimizing process stability, cost-effectiveness, long-term performance across diverse conditions. Additionally, existing studies not thoroughly explored how integrating AnMBRs with advanced resource recovery strategies could improve economic feasibility. This paper presents critical review AnMBR performance, future prospects treatment. It systematically examines recent advancements configurations, operational approaches, hybrid system integration, drawing insights from current literature identify opportunities enhancing efficiency sustainability.

Language: Английский

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Biochar Reduced the Risks of Human Bacterial Pathogens in Soil via Disturbing Quorum Sensing Mediated by Persistent Free Radicals

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 6, 2024

Biochar has great potential in reducing the abundance of antibiotic resistance genes (ARGs) and mobile genetic elements (MGEs) from soil. However, its efficiency removing other biological pollutants, such as human bacterial pathogens (HBPs) virulence factor (VFGs), is rarely studied. Herein, by pyrolyzing rice straw (RS) pine wood (PW) at 350 700 °C, we prepared a series biochar (RS350, RS700, PW350, PW700) investigated their impacts on pathogenicity HBPs. Compared with PW biochar, RS effectively reduced HBPs 6.3-40.1%, well pathogenicity, evidenced an 8.2-10.1% reduction VFGs. Mechanistically, more persistent free radicals (PFRs) were formed than that during pyrolysis, PFRs triggered degradation

Language: Английский

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Electron Transfer Improved by Nanoscale Zero-Valent Iron to Enhance Sulfate Reduction of the Anaerobic System under a Low Chemical Oxygen Demand-to-Sulfate Ratio

ACS ES&T Water, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 20, 2024

Insufficient availability of electron donors during the biological treatment sulfate-rich wastewater can hinder efficient and targeted removal sulfate. Nanoscale zerovalent iron (nZVI) has been shown to enhance anaerobic sulfate reduction as an donor; however, exact mechanism transfer remains unclear. Thus, this work delved into impact nZVI on enhancing performance biosystem, elucidating underlying improvement systematically. The efficiency biosystem could be enhanced by 30% through use under a chemical oxygen demand-to-sulfate ratio (COD/SO42–) 0.3. introduction electrochemical experiments electrical conductivity capacitance sludge. In addition, it also stimulate secretion c-type cytochrome extracellular polymeric substances. These findings collectively confirmed that addition among microbial communities within system. Moreover, facilitated transition important sulfate-reducing bacteria, specifically from Desulfobulbus Desulfomicrobium, which engage in direct interspecies transfer. Within specific range, assimilatory reduction, leading heightened conversion sulfite, thereby reduction.

Language: Английский

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