Fenton、Fenton-Microwave和臭氧高级氧化法处理生活垃圾渗滤液的研究

Studies on the Landfill Leachate Degradation by Fenton,Fenton-Microwave and O_3 Oxidation Method

目前70%以上的城市生活垃圾被直接填埋,如果不能及时有效无害化处理垃圾渗滤液,将导致污染环境。采用Fenton,Fenton-Microwave和臭氧的高级氧化法处理生活垃圾渗滤液,研究了不同微波功率、pH值、H_2O_2和Fe^(2+)物质的量比、臭氧浓度等条件对垃圾渗滤液化学需氧量(COD_(cr))降解率的影响。结果表明Fenton法在pH值为3,H_2O_2和Fe^(2+)物质的量比为3,反应时间90 min条件下垃圾渗滤液(COD_(cr))降解率为52.32%,Fenton-Microwave法在pH值为5,H_2O_2和Fe^(2+)物质的量比3,微波功率为420W,微波辐射下反应时间6min条件下垃圾渗滤液COD_(cr)降解率为61.74%,臭氧氧化法在pH值为8,臭氧速度为30mg/min,催化剂Fe^(2+)和COD_(cr)质量比为3最佳条件下垃圾渗滤液COD_(cr)降解率为48.30%。

At present,more than 70% of the municipal solid waste is directly landfilled,and the leachate produced by the direct landfill will cause environmental pollution if it is not effectively and timely treated harmless.In this work,the effects of microwave power,pH values,the molar ratio of H2O2 and Fe2+and the dosage of O3 on Chemical Oxygen Demand(CODcr)degradation rate of leachate were studied and compared by Fenton method,Fenton-Microwave method and O3 oxidation method.The results show that the CODcrdegradation rate of the leachate is 52.32% by Fenton method under the optimum conditions of pH=3,the molar ratio of H2O2 and Fe2+=3 and the reaction time of 90 min.The CODcrdegradation rate of the leachate is 61.74%by Fenton-Microwave method under the optimum conditions of pH=5,the molar ratio of H2O2 and Fe2+=3,microwave power of 420 Wand microwave irradiation reaction time of 6 min.The CODcrdegradation rate of the leachate is up to 48.30% by O3 oxidation method under the optimum conditions of pH=8 and the rate of O3=30 mg/min.