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