微波/活性炭强化过硫酸盐氧化处理垃圾渗滤液研究

摘要

Microwave-enhanced persulfate (PS) oxidation using activated carbon (AC) as catalyst was originally applied to disposal landfill leachate. The comparison of different process was studied and so as to the effects of pH、dosage of AC、PS dosage、microwave power and radiation time. The obtained results showed that the rates of COD and NH4+-N removal increased with the increase of AC dosage、PS dosage(S2O82-:12COD0)、microwave (MW) power and radiation time. The effect of pH value on COD removal was unconspicuous while NH4+-N removal got better efficiency under alkaline condition. The optimal condition was that:AC dosage=10g/L, S2O82-:12COD0=1.2, pH=9, microwave power=500W and radiation time=10min. Under the optimal condition, the rates of COD and NH4+-N removal were 78.2%and 67.2% respectively, and the biodegradability (BOD5/COD) of the landfill leachate increased to 0.38. The results of comparison experiments showed that the rates of COD and NH4+-N removal in the process of MW-AC-PS were remarkable higher than the other treatments. There might be certain cooperation actions in MW-AC-PS system during the degradation of COD and NH4+-N and thermal effects of MW played a key role. When AC was used for the fourth time, the efficiencies of COD and NH4+-N removal were 61.2%and 46.1%respectively.%采用微波(MW)-活性炭(AC)强化过硫酸盐(PS)氧化处理垃圾渗滤液,研究不同因素对垃圾渗滤液处理的影响,比较不同组合工艺对渗滤液处理的效果及活性炭的多次使用情况.结果表明,COD和氨氮(NH4+-N)的去除率随着AC用量、PS用量(S2O82-：12COD0)、MW功率和辐射时间的增加而增大,pH值对COD的去除影响不明显, NH4+-N在碱性条件下得到更理想的去除效果；在活性炭用量为10g/L,PS用量为S2O82-：12COD0=1.2,pH=9,MW 功率和辐射时间分别为500W 和10min 时,垃圾渗滤液中的 COD 和 NH4+-N 去除率分别为78.2%和67.2%,BOD5/COD由0.17增至0.38；不同工艺对垃圾渗滤液处理效果显示,MW-AC-PS工艺对垃圾渗滤液中COD和氨氮去除率明显高于其他处理,且MW、AC和PS之间存在协同效应,MW热效应显著；活性炭四次实验后,COD和NH4+-N的去除率分别为61.2%和46.1%.