高碘酸钠与APAM联合调理对污泥脱水的影响

EFFECT OF SODIUM PERIODATE-APAM CONJUNCTION ON DEWATERABILITY OF WASTE ACTIVATED SLUDGE

采用高碘酸钠与阴离子聚丙烯酰胺(APAM)联合调理改善污泥脱水性。以污泥比阻和污泥滤饼含水率作为衡量污泥脱水性的指标,分析胞外聚合物(EPS)中蛋白质和多糖含量,并测定污泥Zeta电位和粒径。结果表明:当污泥初始p H为8时,88 mg/g DS(干污泥)的高碘酸钠和2 mg/g DS的APAM可以有效改善污泥脱水,联合调理后污泥比阻降低至4.82×10^12m/kg,污泥滤饼含水率降低至69.67%。污泥经过高碘酸钠氧化后,Zeta负电性降低,可溶性胞外聚合物(S-EPS)中的蛋白质含量增加,荧光光谱显示腐植酸物质的荧光强度降低,污泥中值粒径经过高碘酸钠絮凝后减小。研究结果表明,组合调理剂可以有效改善污泥脱水性,并利于后续污泥处理与处置。

The dewaterability of waste activated sludge was improved by sodium periodate and anionic polyacrylamide (APAM) conjunction. Sludge dewaterability was determined by specific resistance to filtration and the sludge moisture content,and the contents of protein and polysaccharide in extracellular polymers substances (EPS),as well as zeta potential and particle size of the sludge were also determined. The result indicated that 88 mg/g DS (dry sludge) sodium periodate and 2 mg/g DS APAM could effectively improve sludge dewaterability under p H of 8,and specific resistance to filtration and the sludge moisture content decreased to 4. 82×10^12 m/kg and 69. 67%,respectively. After the oxidation of sodium periodate,the zeta potential of sludge increased,protein content of soluble extracellular polymeric substances increased. Fluorescence spectroscopy showed that humic acid in soluble extracellular polymeric substances was oxidized,and the particle size of sludge decreased. The combined conditioner can effectively improve sludge dewaterability and facilitate the subsequent sludge treatment and disposal.