1.College of Bioscience and Resources Environment,Beijing University of Agriculture,Beijing 102206,China;2.Key Laboratory of Urban Agriculture in North China,Ministry of Agriculture and Rural Affairs,Beijing 102206,China;3.Beijing Epoxy Environmental Protection Technology Development Co. Ltd. ,Beijing 100028,China
Abstract:
Landfill leachate often contains high concentration of organic matter, ammonia nitrogen and other pollutants. Heterotrophic nitrification-aerobic denitrification-type microorganisms can remove some organic matter while removing nitrogen, but there are few studies on the application of related mixed bacteria directly to landfill leachate treatment. In this study, six strains of heterotrophic nitrification-aerobic denitrification were screened out from landfill leachate and combined into a compound bacterial agent F6, to explore the nitrogen removal effect of the bacterial agent in landfill leachate. Single strain and compound bacterial agent F6 were used as raw materials. Taking different C/N ratios, concentration of activated carbon, rotational speed and concentration of trace elements as influencing factors, the removal performance of compound microbial agent for ammonia nitrogen (NH-N), total nitrogen (TN) and chemical oxygen demand (COD) in landfill leachate was studied. The results showed that the degradation of F6 could be promoted by increasing the C/N ratio and the concentration of trace elements. When the inoculation amount was 10% and the C/N ratio was 15%, the removal rates of NH-N, TN and COD by F6 were 74.69%, 89.23% and 83.50%, respectively, which increased by 18.46%, 20.97% and 7.98%, respectively, compared with the treatment without activated carbon. Compound heterotrophic nitrification-aerobic denitrification bacterial agent F6 has a good application prospect in the removal of NH-N, TN, COD and other aspects of high ammonia nitrogen landfill leachate.