As（Ⅲ）对活性污泥处理城市污水影响的动态模拟研究

EFFECT OF As(Ⅲ)ON DOMESTIC WASTEWATER TREATMENT USING ACTIVATED SLUDGE PROCEDURE

采用ＭＬＳＳ为１０００ｍｇ／Ｌ，停留时间为１０ｈ的动态模拟实验，研究了Ａｓ（Ⅲ）对活性污泥处理城市污水的某些影响．其结果：用１０ｐｐｍ、５０ｐｐｍＡｓ（Ⅲ）处理后，脱氢酶活性抑制率分别为５．４％和１４．４％，ＢＯＤ＿５去除的抑制率分别为４．３％和１０．５％，氨基酸总量的抑制率分别为３．４１％和６．１２％。处理７２ｈ后，有４５％、３５％的Ａｓ（Ⅲ）转化成Ａｓ（Ⅴ），此时砷的去除率分别是４４．３％和４０．２％；污泥的砷吸附量分别为１８．６４ｍｇ／ｇ（干污泥）和７６．９１ｍｇ／ｇ（干污泥）．

Impacts of As(Ⅲ)on the domestic wastewater treatment using active sludge procedurewere investigated experimentally at MLSS of 1000 mg/L and HRT 10h.The results aresummarized as follows:the synthetic wastewater contains of 10 and 50 ppm As(Ⅲ)enteredactivated-sludge system after 72 hours,the inhibition rate of dehydrogenase were 5.4%and14.4%,the inhibition rate of the removal rate of BOD_5 were 4.3%and 10.5%,the con-tent of acidhydrolyble amino acids decreased 3.41%and 6.12%,the oxidized rate of As(Ⅲ)by activated sludge systems were 45%and 35%respectively, the removal of As were44.3%and 40.2%,and absorbed by activated sludge 18.64 and 76. 96 mg/g(MLSS)Asrespectively.