摘要： 用NaCl调整剩余污泥，考察NaCl对污泥脱水性能及胞外聚合物（EPS）分层行为的影响。结果表明：提高盐度引起污泥可滤性能变差，污泥絮体解絮，部分结合水转变为自由水，导致DS增加，利于污泥体积降低。Na⁺主要集中在EPS外层，通过离子交换作用使污泥絮体解絮，加速了EPS外层组分的释放；NaCl的投加降低了EPS各层疏水能力，使EPS各层负电性增加，降低污泥生物絮凝能力。

关键词: 活性污泥, 污泥脱水性能, 胞外聚合物, 生物絮凝, 盐度

Abstract: Using NaCl for adjusting residual sludge,the influences of NaCl on sludge dewaterability and the hierarchical behavior of extracellular polymeric substances(EPS) have been investigated. The results show that the increase of salinity causes the decrease of sludge filterability,the deflocculation of sludge flocs,and the conversion of part of bound water into mobile water,resulting in the increase of DS,and the reduction of sludge volume. Na⁺ are mainly concentrated in the outer layer of EPS,which causes the sludge flocs deflocculated through ion exchange,and speeds up the relief of EPS outer components. The addition of NaCl decreases the hydrophobic ability of EPS in every layer,increases the electro-negativity of EPS in every layer,and decreases sludge bioflocculation ability.

Key words: activated sludge, sludge dewaterability, extracellular polymeric substances, bioflocculation, salinity

中图分类号: 

• TU992.3