石灰—硫酸亚铁法处理高浓度砷和氟酸性废水试验研究

采用二级石灰－硫酸亚铁法处理砷和氟浓度分别高达１１０ｍｇ／Ｌ和６５０ｍｇ／Ｌ以上的酸性废水。当一、二级控制条件分别为ｐＨ９．５和９．０、Ｆｅ／Ａｓ比为２．５和１５时，一级砷和氟去除率分别可达９９．５％和９４％，二级出口砷和氟残余浓度分别可低至０．１ｍｇ／Ｌ和１３．８ｍｇ／Ｌ，Ｃｕ、Ｚｎ和Ｐｂ等重金属离子均达检不出水平。

Study on the Treatment of Acid Waste Water Containing High Concentration of Arsenic and Fluorine with Lime and Ferrous Sulfate

The paper introduced the test for treating acid waste water containing Arsenic and Fluorine of more than 110 mg/L and 650 mg/L by means of two stages of Lime and Ferrous Sulfate. When the pH values controlled at 9.5 and 9.0 and Fe/As ratio at 2.5 and 15 at first and second stage respectively, the removal ratio of As and F at the first stage are 99.5% and 94%. The remains of As and F at the second stage are lower than 0.1 mg/L and 13.8 mg/L, respectively. Copper, Zinc and lead, etc. can not be found in the treated waste water.