Study on Nitrogen Removal Performance of Kitchen Waste Leachate as an External Carbon Source for Low Carbon Nitrogen Ratio Wastewater Treatment

Abstract

水污染及处理 Abstract The kitchen waste leachate contains high organic matter, and its biodegradability is strong. Collaborative treatment of low carbon nitrogen ratio wastewater through kitchen waste leachate can not only reduce the cost of wastewater treatment, but also realize waste treatment by waste. Aiming at the research on the nitrogen removal performance of kitchen waste leachate as an external carbon source for low carbon ratio wastewater treatment, the denitrification effect of kitchen waste leachate with traditional carbon sources methanol and sodium acetate was compared under different COD/TN conditions. The results showed that: When COD/TN = 6, the order of the denitrification rate is: kitch-en waste leachate: 18.77 mg - 3 NO N − /(gVSS·h) > sodium acetate: 15.84 mg - 3 NO N − /(gVSS·h) > methanol: 9.09 mg - 3 NO N − /(gVSS∙h); the order of total nitrogen removal rates is: kitchen waste leachate: 91.72% > sodium acetate: 90.98% > methanol: 75.18%. The kitchen waste leachate was actually applied to the wastewater treatment of an organic resource treatment center as an exter-nal carbon source, and the biochemical system of the wastewater treatment process operated stably.