活性污泥法处理生活污水过程中铬的变化规律研究

The Changes of Chromium in An Actived sludge System Treating Municipal Sewage

本文研究了活性污无法处理生活污水过程中污泥负荷和ｐＨ对液相中总铬和Ｃｒ￣（６＋）浓度变化的影响，发现总铬和ｃｒ￣（６＋）难度最低值出现的时间随污泥负荷的增大而推迟；在达到最低值后，总铬和Ｃｒ￣（６＋）浓度呈现不断增大趋势；在污水ｐＨ为８左右时，总铬浓度的最低位显著低于ｐＨ为７左右时的最低值；波相中的铬主要以Ｃｒ￣（６＋）的形态被污泥吸附。

The effect of sludge loadings and pH on the concentrations of total chromium and Cr￣(6+) in an actived sludge system wasstudied.The time when the lowest points of total chromium and Cr￣(6+) concentrations appeared was postponed as the sludge loading in-creased.The concentrations increased continuously after reaching the lowest points. The concetrations of total chromium were much lowerat the pH of about 8 than that at the pH of about7.Most of thc chtomium in watcr was transferred to sludge as the compounds of Cr￣(3+).