压力环境下活性污泥的耐盐驯化过程

Acclimation process of salt-tolerant activated sludge under pressurized condition

通过逐步提高盐浓度的梯度盐度方法驯化耐盐活性污泥,采用加压-常压对比实验,探讨活性污泥耐盐驯化过程中,0.3 MPa的压力环境对有机物降解规律、污泥脱氢酶活性及胞外聚合物(EPS)含量的影响。结果表明,经耐盐驯化的活性污泥在5%的高盐度环境下仍可达到75%以上的有机物去除率;当驯化盐度达3.5%及以上,加压耐盐活性污泥有机物去除率及污泥脱氢酶活性均高于常压,其优势更为突出。耐盐驯化过程中活性污泥胞外聚合物(EPS)含量较稳定,加压系统EPS含量低于常压,这可能是加压活性污泥法可以实现原位污泥减量的重要原因之一。

The acclimation process of salt-tolerant activated sludge with a gradual increase in salt concentration was studied by pressurized-atmospheric comparative experiments. The aim was to investigate the effect of a pres- sure environment of O. 3 MPa on the degradation of organic matter, the dehydrogenase activity and the extracellu- lar polymeric substances （EPS） of sludge during the salt domestication process of activated sludge. The results showed that after the salt domestication of activated sludge, the removal rate of organics could increase to more than 75% with a 5% salt concentration. The removal rate of organics and the dehydrogenase activity of sludge in the pressurized reactor were higher than that of the atmospheric reactor. Moreover, the EPS of the activated sludge were stable during the salt domestication process. The content of EPS of the pressurized activated sludge was consistently lower than that of the atmosphere sludge, which may be an important reason for the in-situ sludge reduction ability of the pressurized activated sludge process.