Application performance and risk analysis of the brewing wastewater recycling technology
Brewing wastewater is difficult to be treated efficiently because of its high concentration of organic matter.In addition,urban wastewater treatment plants are facing the problem of low denitrification performance for low carbon and nitrogen ratio(C/N)wastewater caused by insufficient organic matter.Therefore,the nitrite nitrogen(NO3--N)removal efficiency of low C/N wastewater enhanced with brewing wastewater as a carbon source was investigated,and the hydraulic retention time(HRT)was optimized.Moreover,the vital microorganisms and technical risks were analyzed.The results showed that the volume ratio of brewing wastewater to low C/N wastewater 500∶1,and total nitrogen(TN)19.7 mg/L,the chemical oxygen demand(COD),TN and NO3-N concentrations after treatment could meet the tailwater discharge standard of wastewater treatment plants under the conditions of HRT 12-36 h.The HRT optimization process caused the difference in the bacterial community,and Acidovorax was the main het-erotrophic denitrifying bacteria that simultaneously removed COD and NO3-N.In addition,the enrichment of pathogenic and mobile elements showed that the comprehensive risk of microbial pathogenicity and transmission were the lowest at the condition with an HRT of 12 h.In a word,the resource utilization technology of brewing wastewater was feasible,and HRT of 12 h was the most efficient and safe technical parameter.The study provided theoretical guidance and reference for the treatment of brewing wastewater.
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NSTL
万方数据
维普
