序批式中和沉淀法处理钛生产含铬废水研究

氯化法海绵钛生产过程中会产生大量的含重金属离子的酸性废水,含有大量的重金属氯化物,主要污染物为Cr(Ⅲ)和Mn(Ⅱ),应当调节pH值至Cr3+沉淀完全,将含铬废水单独处理。采用传统工艺投加石灰乳后沉淀[1],会产生大量的含铬废渣难于处置。本研究通过实验室研究和工程实践,开发了一种序批式的中和沉淀法,可以实现连续准确控制pH值,使铬渣控制在最少量。

Research on Treatment of Titanium Production Chromium- containing Wastewater with Sequencing Batch Reactor Neutralization Precipitation Method

A great amount of acidic wastewater containing heavy metal ion will be produced in the process of titanium sponge production,containing a large amount of heavy metal chloride,with principle pollutant of Cr(Ⅲ) and Mn(Ⅱ).PH value shall be adjusted until Cr3 + is precipitated completely.Chromium-containing wastewater shall be treated separately.To adopt traditional technology of precipitating [1] after add of lime milk will produce a lot of chromium residue which is difficult to be treated.Through lab research and engineering practice,this research develops a sequencing batch reactor neutralization precipitation method which can control pH value continuously and accurately so as to control chromium residue at the minimum amount.