利用黄钾铁矾类矿物形成过程预处理高浓度含硫废水

The treatment of high-concentrated sulfur wastewater by the process of jarosites deposition

利用黄钾铁矾类矿物形成过程对某高浓度工业含硫废水进行预处理,除去一定量的SO42-,使溶液中低价态的硫继续转化成SO42-,再进行氧化处理。采取二次沉淀除去溶液中更多的SO42-,大大降低了该水样的COD值。通过实验得出沉淀的最佳工艺条件为pH值为2.50～3.20,氯化铁晶体(FeCl3.6H2O)最佳投入量为50g/L。经过两次黄钾铁矾类矿物沉淀过程,该废水COD的去除率达到85.29%,结合H2O2的氧化处理,COD去除率可达96%。为高浓度含硫废水进入生化处理前的预处理提供了实验依据。

High-concentrated sulfur waste water from a certain factory in Jiangsu was treated by the process of jarosites deposition. In this paper, a method for treating high-concentrated sulfur waste water in the industry is discussed. The experiment utilized the depo- sition process to remove parts of SO4^2-, caused the continuous transform of low-valence S into SO4^2- and oxidized low-valence S by H2O2. The second deposition could remove more S, thus sharply decreasing the COD of the waste water. According to the experimental resuks, the optimal operational parameters are confirmed, the pH value is between 2.50 and 3.20, and the optimal FeCl3 addition amount is 50 g/L. The whole waste water flow needs two deposition processes, which make the disposal rate COD of the waste water up to 85.29%. And the disposal rate COD of the waste water can eventually reach 96% by H2O2 oxidation. The results obtained provide fundamental data for practical operation before biochemical treatment.