超声-冻融联合技术对污泥理化性质的影响  

Combination Effects of Ultrasonication and Freeze-thawing on Physicochemical Properties of Sewage Sludge

作　　者：丁园[1] 余小芬[1] 刘运坤[1] 史蓉蓉[1] 

机构地区：[1]南昌航空大学环化学院,江西南昌330063

出　　处：《贵州农业科学》2014年第10期252-254,共3页Guizhou Agricultural Sciences

基　　金：江西省教育厅项目"有机种植条件下土壤固碳增汇的机理研究"(GJJ13509)

摘　　要：为提高污泥的破解效率,采用超声-冻融联合技术破解南昌市某污水处理厂二沉层污泥,选择声能密度、超声时间、冷冻时间、冷冻温度等4个因素为试验参数,设计3因素4水平和1因素2水平(34×12)的混合正交试验,分析在不同处理条件下污泥的理化性质。结果表明:超声和冻融不仅可促进污泥中可溶性化学需氧量、总氮和总磷的释放,还能有效降低污泥重金属含量,且超声的作用效果优于冻融。在最佳试验条件下污泥向上清液释放的SCOD、TN和TP分别是原来的5.70、5.34和1.94倍,污泥重金属权重离子冲量ωI降至原来的88%。To enhance the cracking efficiency of sewage sludge,ultrasonic and freeze-thawing technologies were applied in sewage sludge sampled from secondary sedimentation tank of typical municipal sewage treatment plants in Nanchang.After taking ultrasonic density,ultrasonic time,freezing time and freezing temperature as factors,a three-factor two-level and one-factor two-level combined orthogonal experiment was designed to analyze the change of physicochemical properties of test sludge.Results：All control factors could not only promote the release of SCOD （soluble chemical oxygen demand）,TN （total nitrogen）and TP （total phosphorus）, but also reduce the content of heavy metals in the sludge. Moreover,the effect of ultrasonication was better than freeze-thawing. SCOD, TN and TP in the supernate were 5.70,5.34 and 1.94 times as much as the control respectively,and ωI （weight ion impulse）of heavy metal in the sludge reduced to 88% of control.

关 键 词：超声 冻融 联合处理 污泥 重金属 养分 

分 类 号：S273.5[农业科学—农业水土工程]