电解-脱硫灰-FeCl_3联合调理对污泥脱水性能的影响  

Effect of Electrolysis-Desulfurization Ash-FeCl_3 on Dewaterability of Sludge

作　　者：陈巍[1] 邢奕[1] 陈月[1] 宋存义[1] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083

出　　处：《化学试剂》2016年第5期399-404,共6页Chemical Reagents

基　　金：国家自然科学基金资助项目(51104009);北京市优秀人才培养资助项目(2012D009006000003);中央高校基本科研业务费专项资金资助项目(FRF-TP-12-011B);昆明市科技计划项目(2012-02-09-A-G-02-0001)

摘　　要：通过测定毛细吸水时间(CST)、滤饼含水率(Wc)、胞外聚合物(EPS)、Zeta电位和FTIR,探究电解-脱硫灰-Fe Cl_3联合调理对污泥脱水性能的影响及其作用机理。结果表明,电解-脱硫灰-Fe Cl_3联合调理污泥的效果明显好于电解单独作用,当电解条件为Ti/Ru O_2电极、极间距4 cm、搅拌速度100 r/min、0.100 mol/L Na Cl、电压20 V、投加300 mg/g脱硫灰和60 mg/g Fe Cl_3、电解40 min后,污泥的CST和Wc分别由1 239.5 s和83.69%降至106.5 s和70.50%,脱水速度提高92.08%,脱水程度提高15.66%。电解能促进紧密粘附胞外聚合物(TB-EPS)剥落,剥落的TB-EPS中,部分被转化为溶解性胞外聚合物(S-EPS)和松散粘附层胞外聚合物(LB-EPS),部分EPS被分解为氨基酸和脂肪酸等小分子物质,释放了部分表面吸附水和内部结合水。To study the effect of electrolysis, desulfurization ash, and FeCI3 on the dewaterahility of sludge, the sludge was treated by combination of these three items. The data, including capillary suction time （ CST ）, water content of the sludge filter cake （ We）, extracellular polymeric substance （ EPS）, zeta potential and fourier transform infrared spectroscopy （ FTIR ）, indicate that the treatment of the sludge by electrolysis plus desulfurization ash, and FeCI3 is more effective than electrolysis alone. Specifically, when the electrolysis condition is Ti/RuO2 electrode, electrode spacing 4 cm, stirring speed 100 r/rain, NaCI 0. 100 mol/L, voltage 20 V,time 40 min and the sludge was treated by FeC13 and desulfurization ash,with their dosage of 60 mg/g and 300 mg/g,re- spectively, CST and Wc were reduced to 106. 5 s and 70. 50% from their original 1 239.5 s and 83.69%. The level and the speed of dewatering of the sludge are 15.66% and 92.08% undergone such a treatment. Mechanistically, this high efficiency is due to the degradation of EPS into amino acids, fatty acids, and other small molecules, resulting in the releasing of water from both surface and inside of sludge. Also, electrolysis facilitates the degradation of tightly bound EPS （TB-EPS） ; part of TB-EPS becomes soluble EPS （S-EPS） and loosely bound EPS （LB-EPS）.

关 键 词：污泥 脱水性能 电解 脱硫灰 FECL3 

分 类 号：X705[环境科学与工程—环境工程]