O_3-脱硫灰-FeCl_3联合调理对污泥脱水性能的影响  

EFFECT OF OZONE-DESULFURIZATION ASH-FeCl_3 ON SLUDGE DEWATERING PERFORMANCE

作　　者：陈巍[1] 邢奕[1] 陈月[1] 周亮[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：《环境工程》2016年第3期121-127,共7页Environmental Engineering

基　　金：国家自然科学基金(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：以毛细吸水时间(CST)和滤饼含水率(Wc)为指标,探究O_3-脱硫灰-FeCl3联合调理对污泥脱水性能的影响。通过测定污泥各层胞外聚合物(EPS)含量、可溶性化学需氧量(SCOD)、Zeta电位以及红外光谱(FTIR),探讨了O_3、脱硫灰和FeCl_3调理污泥的作用机理。结果表明:O3-脱硫灰-FeCl_3联合调理污泥的效果明显好于O_3单独调理。SCOD和FTIR分析表明:部分EPS氧化分解为氨基酸、脂肪酸等小分子有机物或无机物,释放了部分表面吸附水和内部结合水。O_3能促进紧密粘附的胞外聚合物(TB-EPS)剥落;剥落的TB-EPS,部分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),部分被Fe(OH)_3吸附。当O_3、脱硫灰和FeCl3投加量分别为85.72mg/g(DS)、400mg/g(DS)和60mg/g(DS)时,CST和Wc分别由1239.5s和83.69%降至204.3s和70.70%,脱水速度提高83.52%,脱水程度提高15.41%。The ozone,desulfurization ash and ferric chloride were used together as the conditioning agent to treat the sludge.The capillary suction time（ CST） and the water content of the sludge filter cake（ Wc） were measured to investigate the effect on the sludge dewatering performance. Extracellular polymeric substance（ EPS）,soluble chemical oxygen demand（ SCOD）,zeta potential and fourier transform infrared spectroscopy（ FTIR） were also explored to expain the mechanism of sludge dewaterability. The results indicated that when ozone was combined with desulfurization ash and ferric chloride,treatment effect went significantly better. SCOD and FTIR analysis of the sludge filtrate indicated that ozone made parts of the EPS decomposition of amino acids,fatty acids and other small organic molecules or inorganic compounds. It lead to release some surface water and internal combined water. It showed that a large amount of TB-EPS were spalled by ozone. Among them,a part was turned into S-EPS and LB-EPS,the other part was absorbed by ferric hydroxide. When the dosage was 85. 72 mg /（ g DS） ozone,300 mg / g（ DS） desulfurization ash and 60 mg / g（ DS） ferric chloride,CST and Wc were respectively reduced to204. 3 s and 70. 70% from 1 239. 5 s and 83. 69% of the original sludge. The dewatering speed increased by 83. 52%,and the dewatering level increased by 15. 41%.

关 键 词：污泥 脱水性能 O3 脱硫灰 FECL3 

分 类 号：X703[环境科学与工程—环境工程]