半连续活性污泥法对污水中五价砷的去除

采用控制污泥浓度ＭＬＳＳ为２０００ｍｇ／Ｌ的半动态试验，我们研究了活性污泥对不同浓度砷、同一浓度但有机负荷不同时的去除能力。结果表明：活性污泥对砷的吸附在１－２小时左右达到平衡状态；含２０ｐｐｍ、１００ｐｐｍ，Ａｓ（Ⅴ）和污泥作用１２小时后，其去除率分别为５５．８％和４６．３％；只有极少量Ａｓ（Ⅴ）转化成Ａｓ（Ⅳ）；污水的有机负荷（ＣＯＤ）高，污泥对砷的去除率也上升。

As(Ⅴ) UPTAKE BY ACCLIMATED ACTIVATED SLUDGE

Used by batch experiments wihich KLSS were controled to be 2999mg/l,the As(Ⅴ)uptake by activated-sludge ,and the effect of organic loading on the uptake rate were studied .The experiments showed :the equilibrium of absorption rate within two hours ;the removel rate of As(Ⅴ)at the concentration of 20and 100ppm were 55.8 and 46.3% respectively after 12 hours aerated .At experiments condition As(Ⅴ) can not reduced to As(Ⅴ) .The removal rate of As(Ⅴ) is higher with the addition of the organic loading.