不同预处理方式下剩余污泥中磷释放及有机物变化

Phosphorus Release and Variation of Organic Matter of Excess Activated Sludge in Different Pretreatments

为了系统掌握同种污泥在不同处理方式下磷释放过程及伴生有机物的变化情况,采用厌氧、EDTA-厌氧、超声以及厌氧-超声4种预处理方式,探究处理前后TP、PO4^3--P、SCOD、蛋白质、多糖及DNA浓度变化特性,以及溶解性有机物的组分分布。结果表明,在不同预处理方式下污泥释磷效果及各类有机物产生量存在差异,联合处理的释磷效果优于单一处理方式;经EDTA-厌氧、厌氧-超声处理后污泥释放的PO4^3--P浓度最高,分别达到6.04、10.72mg/gVSS,其中经过EDTA-厌氧处理后产生的蛋白质、多糖、微生物副产物及腐殖酸类物质的量少,有利于后续磷回收。综合而言,EDTA-厌氧预处理的效果最优。

In order to systematically grasp the release process of phosphorus and the changes of organic matter of the same sludge in different treatment methods, sludge was pretreated by anaerobic process, EDT A -anaerobic process, ultrasonic process and anaerobic-ultrasonic process. The characteristics of TP,PO4^3-- P, SCOD, protein, DNA and polysaccharide before and after treatment were investigated. And the components distribution of dissolved organic matter in supernatant was analyzed. The results showed that different pretreatment methods had different influence on phosphorus release and organic matter production, and combined pretreatment improved phosphorus concentrations which was better than single treatment. The sludge pretreated by EDTA-anaerobic and anaerobicultrasonic process released the most PO4^3-- P, and the concentration of PO4^3-- P in the supernatant was 6. 04 mg/gVSS and 10. 72 nig/gVSS. And the amount of protein, polysaccharide, by-product-like and humic acid-like matters pretreated by EDTA-anaerobic process was less, which was beneficial to phosphorus recovery. In summary, EDTA-anaerobic pretreatment is the best.