Exploration on Recycling of Waste Liquid COD by Potassium Dichromate Method

Abstract

The research is supported by a Project Funded by the brand professional project form Yancheng teachers college (2016) and the teaching reform and practice of medicinal chemistry (2018YCTUJGY006) and the Flagship Major Development of Jiangsu Higher Education Institutions”(PPZY2015B113)。

Abstract

Potassium dichromate method was used to determine the high concentration of Hg²⁺, Ag⁺, Cr(VI), Cr³⁺ and H₂SO₄ in COD waste liquid. The waste liquid of COD was determined by potassium dichromate method, and the aluminum was used to replace Ag+ in the waste liquid to generate Ag and precipitate out, Cr(VI) was reduced to Cr³⁺, and then alkali neutralization, filtration and other measures were added to carry out treatment and recovery of useful substances, which not only reduced environmental pollution, but also recovered resources, with both economic and environmental benefits.

Keywords Potassium dichromate method; Waste liquid; Reduction; Neutralization

DOI: 10.7176/CER/11-10-08

Publication date: November 30^th 2019