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Factors of sludge pretreatment by the advanced oxidation process of microwave and hydrogen peroxide

摘要：作为一种新的污泥预处理技术,微波-过氧化氢联合作用处理污泥显示出高效、快速的优势.试验考察了3个主要参数:污泥浓度(定量H₂O₂和等比例H₂O₂/TSS投加)、微波功率和pH值对微波-过氧化氢联合作用处理污泥的影响.研究结果表明:①在H₂O₂定量投加(5000mg·mL^-1)时,当污泥浓度超过22g·L^-1,溶出COD没有显著增加;在H₂O₂与TSS等比例投加条件下,COD溶出与污泥浓度呈线性关系;②微波功率在200～1000W范围内不影响污泥处理效果;③在微波-过氧化氢联合作用处理污泥时,污泥溶解比例随着污泥初始pH值的提高而增加.

Abstract：Sludge pretreatment by the Advanced Oxidation Process(AOP)of microwave(MW)and hydrogen peroxide(H₂O₂)is being paid more and more attention due to its high efficiency.As three key factors,including Total Suspended Solids(TSS)concentration,microwave power,and initial pHvalue of sludge,their impacts on the performance of the microwave-H₂O₂ process were investigated by batch experiments.At the fixed H₂O₂ dosage(5000 mg·L^-1),the release of soluble Chemical Oxygen Demand(COD)increased little when TSSconcentration was over 22 g·L^-1.However,the release of soluble CODlinearly correlated with the TSSconcentration at 1.0 of H₂O₂ dosage/TSSratio.The power of microwave,ranging from 200～1000W,had little effect on the sludge treatment by the microwave-H₂O₂ process at 5 g·L^-1 of TSSconcentration and 5000 mg·L^-1 of H₂O₂ dosage.It is interestingly found that the released CODincreased along with rising of the initial pHvalue of sludge during sludge pretreated by the microwave-H₂O₂ process at 5 g·L^-1 of TSSconcentration and 5000 mg·L^-1 of H₂O₂ dosage.