利用硫酸根自由基处理剩余污泥  

Treatment of excess sludge with sulfate free radical

作　　者：梁花梅[1] 孙德栋[1] 郑欢[1] 马春[1] 张新欣[1] 郝军[1] 薛芒[1] 

机构地区：[1]大连工业大学轻工与化学工程学院,辽宁大连116034

出　　处：《大连工业大学学报》2013年第1期47-50,共4页Journal of Dalian Polytechnic University

摘　　要：利用K2S2O8热活化产生具有强氧化性的硫酸根自由基破解剩余污泥,与单独加热相比,考察了处理前后污泥性质的变化。实验结果表明,随着反应时间的增加,污泥分解率呈线性上升趋势,升高温度可提高K2S2O8热活化的效率,增加污泥的破解率。当反应温度90℃、加热时间90min、每克悬浮固体(SS)中K2S2O8投加量为0.5g时,污泥分解率达16.9%;微生物胞外聚合物(EPS)被分解、胞内物质释放到液相中,使污泥上清液中SCOD由单独加热时的435mg/L增至719mg/L;融胞释放的TN、TP质量浓度比单独加热处理分别增加了46%和60%;在高温及氧化剂的作用下,部分有机氮被转化成NH4+-N,使污泥上清液中的NH4+-N质量浓度由15.0mg/L增至27.8mg/L。The disintegration of excess sludge with sulfate free radical produced by heat-activated potassium persulfate was studied. The changes of the sludge＇s nature before and after the treatment were investigated. The results indicated that the sludge dissolution ratio displayed a linear decrease with the increase of reaction time. Elevated temperature can improve the efficiency of heat-activated potassium persulfate and the sludge disintegration rate. In the following operation condition, reaction temperature of 90 ℃, heating time of 90 min and the K2S208 dosage of 0.5 g per gram SS, the sludge dissolution ratio was 16.9%. In this operation, more microbial extracellular polymeric substances （EPS） were decomposed, and more intracellular material was released to the liquid phase. The concentration of SCOD was increased to 719mg/L, which is 435 mg/L by single heating treatment; the concentration of TN, TP was increased by 46% and 60% respectively. Part of organic nitrogen was mineralized by oxidants to NH＋-N, whose concentration was increased from 15.0 to 27.8 mg/L.

关 键 词：剩余污泥 硫酸根自由基 过硫酸钾 预处理 

分 类 号：X703.1[环境科学与工程—环境工程]