Enhancing Biological Nitrogen Removal of Slaughterhouse and Meat Processing Wastewater in Three-Stage Ao Process by Influent Allocation: From Lab-Scale to Full-Scale Investigation

Published: Jan. 1, 2024

Three-stage anoxic/aerobic (AO) process is promising for efficient nitrogen removal from high-strength wastewater. Herein, the effects of influent allocation modes (50/40/10 vs. 50/25/25) on performance treating slaughterhouse and meat processing wastewater (SMPW) were investigated lab-scale to full-scale three-stage AO processes. Compared 50/25/25 (94.1%), mode 50/40/10 achieved a higher 97.7% better adaptability ammonia load. The second anoxic tank contributed highest TN in system with 50/40/10, while simultaneous nitrification-denitrification aerobic denitrification thrid oxic effectively enhanced efficiency. Microbial community analysis revealed that SMPW treatment systems tended enrich lipolytic bacteria (Pseudomonas Bacillus), cellulolytic (Christensenellaceae_R-7_group), proteolytic (Proteiniclasticum, Planococcus, OLB8), denitrifying glycogen accumulating (Candidatus_Competibacter), antibiotic-resistant (Rheinheimera). Meanwhile, inherent nature promoted an increase dissimilatory nitrate reduction ammonium pathway, abundant complex organic substances environment ensured removal. had no significant effect nitrification process, but obviously enriched nitrous oxide reductase encoded by gene nosZ, which reduced carbon emission. reliability was verified 35,000 m3/d plant, effluent compliance stable operation within 48 days. This study provides valuable reference effective regulation SMPW.

Language: Английский

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Decoding the trajectory of antibiotic resistance genes in saline and alkaline soils: Insights from different fertilization regimes

Environment International, Journal Year: 2024, Volume and Issue: 195, P. 109247 - 109247

Published: Dec. 31, 2024

Language: Английский

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Genetic characterization of non-O1/non-O139 <i>Vibrio cholerae</i> mobilome: a strategy for understanding and discriminating emerging environmental bacterial strains

Journal of Biological Research - Bollettino della Società Italiana di Biologia Sperimentale, Journal Year: 2023, Volume and Issue: unknown

Published: Sept. 12, 2023

Acute diarrhea and cholera (AWD/C) result in more than 21000 to 143000 global mortality annually are associated with Vibrio cholerae. The pathogen has shown increasing evolutionary/emerging dynamics linked mobilome or ubiquitous nature of mobile integrative genetic conjugative elements (MIGCE), however, such rarely reported amongst somatic-antigen non-agglutinating Type-1/-139 V. cholerae (SA-NAG-T-1/139Vc). study reports the detection mobilome-associated indices SA-NAG-T-1/139Vc as a potential strategy for differentiating/discriminating emerging environmental bacteria. Presumptive isolates were retrieved from five water sources, while strains characterized/serogrouped confirmed using simplex comparative-genomic-multiplex Polymerase Chain Reaction (PCR). Genomic island (GI-12det, GI-14det, GI-15det); Phages (TLC-phagedet, Kappa-phagedet) ICEs SXT/R391 family genes (SXT/R391-ICEs integrase, SXT-Hotspot-IV, ICEVchInd5Hotspot-IV, ICEVchMoz10Hotspot-IV) detected. Other rare ICE members ICEVcBan8att gene Seventh Pandemic (VSP-II Integrase, Prototypical VSP-II) also Results revealed that 8.22% (61/742) serogroup observed harbors integrase (34/61; 55.7%) other traits including; attB/attP (29/61; 47.5%, 14/61; 23%), (4/61; 6.56%), phage types (TLC-phagedet: 2/61; 3.28% Kappa-phagedet: 7/61; 11.48%) well (INT1, Sul1, Sul2) (29/61: 47.5%; 21/61: 34.4%; 25/61: 41%). Such determinants/MIGCE suggests discriminatory tendencies SA-NAG-T-1/139Vcwhich may be applied typing evolving/emerging need encourage application continuous these is suggestive interest controlling future strains.

Language: Английский

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