污水处理系统剩余污泥碱处理融胞效果研究

Study on Treatment of Excess Sludge Under Alkaline Condition

研究了碱处理对污水生物处理系统剩余污泥的融胞效果及其影响因素.结果表明,碱处理能够使污泥细胞中有机物溶出,成为溶解性物质,从而使污泥液相的溶解性化学需氧量增加.pH值高于11.0时,污泥的絮体和细胞2种结构被破坏,而pH值低于11时,仅能破坏其絮体结构.碱处理过程中,起作用的是OH-离子,但同时加入的金属离子也会影响污泥融胞的效果.碱处理能减小污泥的重量,VS的最大去除率可达48.01%(TS约为40.40%,pH值13.0左右时).污泥粒径随着碱处理pH值的升高而减小.污泥浓度、pH值和处理时间均是影响碱处理效果的重要因素,正交试验表明,在高pH值下,污泥浓度越高,碱处理污泥融出的SCOD总量越多,但折算为相同pH值下,单位污泥融出的SCOD基本不变.

Disintegration of alkaline treatment on excess sludge and its influencing factors were investigated. The results show that alkaline treatment can increase the soluble chemical demand oxygen （SCOD） by releasing the organic materials from cells to water and converting the insoluble ones to soluble ones. The floc structures and the cell structures of sludge were destroyed in the process of alkaline treatment when the treated pH value was above 11.0. OH- played the role in the alkaline treatment and the cation would impact the efficiency. The maximal removal of volatile solid （VS） were 48.01% and 40.40 % for total solid （TS） when the pH value was 13,0. Sludge size reduced with the increase of pH value. Sludge concentration, pH value and treatment time were three important factors of alkaline treatment. The results of orthogonal experiment indicated that the sludge concentration was a marked factor of affecting the efficiency of alkaline treatment, but the SCOD of unit sludge was almost similar.