不同预处理方法对剩余污泥性质的影响研究

研究了3种污泥预处理方法(酸、碱和热处理)对污泥性质的影响.结果表明,3种处理方法对污泥均有一定破碎作用,其中碱处理的破碎效果最好,污泥的破碎率最大(约达58.46%),释放的SCOD最高(2 934.9 mg/L).处理后污泥的溶解性有机物的主要成分为蛋白质、碳水化合物和挥发性脂肪酸(三者之和约占总量的80%～90%),碱处理污泥的溶解性蛋白质增加最多(2 058.6 mg/L),而溶解性碳水化合物则是热处理污泥的增加值最大(353.2 mg/L).3种污泥预处理方法均会降低污泥的SS和VSS,其中碱处理效果最好,两者的减少量分别达到25.32%和38.84%,而酸处理效果最差,仅9.05%和1.80%.粒径分析表明,酸、碱处理会减小污泥的粒径、增加污泥的比表面积和提高污泥粒径的均匀性.本研究还对3种预处理方法对污泥的融胞机理进行了分析.

Impacts of Different Pretreatments on Characteristics of Excess Sludge

The impacts of three pretreatments (acid, alkaline and thermal treatments) on the characteristics of sludge were discussed in this study. The results showed that the three pretreatments could disintegrate the sludge and the effectiveness of alkaline treatment was the maximal (about 58.46%) and its SCOD release was also the maximal (2934.9 mg/L). The main compositions of soluble organics were proteins, carbohydrates and volatile fatty acids (about 80%~90%, together). The increase of soluble proteins in the alkaline treated sludge was the maximal (2058.6 mg/L), while the increase of soluble carbohydrates in the thermal treated sludge was the maximal (353.2 mg/L). The SS and VSS of sludge were decreased by the treatments and the effectiveness of alkaline treatment was the best and that of acid treatment was the worst. The particle size distributing of sludge showed acid and alkaline treatments could decrease the particle size and increase the consistency of sludge. The solublized mechanism of the three treatments was also discussed in the paper.