Abstract
Chromium pollution is a serious issue because of carcinogenic toxicities of the pollutants and low recovery rate of chromium because of the presence of organic, such as protein and fat. In this work, high recovery rate and high purity of the chromium ion were successfully prepared by the way of acid enzyme, flocculant, and Fenton oxidation. The experiments were characterized by TG, TOC, UV-VIS, and SEM. In the work, the tannery waste chrome liquor was used as experimental material. The results showed that the percentage of reduction of TOC in the tannery waste chrome liquor by method of Fenton oxidation, acid enzyme, and the flocculant was 71.15%, 65.26%, and 22.05%, respectively. Therefore, the organism content of chrome tanning waste liquid was greatly reduced through the pretreatment. And the application experiment showed that the properties and grain surface and fibers of the tanned leather with commercial chromium powder and chrome tanning agent prepared from the chromium waste liquid treated with Fenton are nearly the same.
Highlights
In recent years, the environmental pollution problems involved with the emissions of tannery sludge with chromium are increasing, which bring a huge challenge for society
The chromium ions will coordinate with organics, which can decrease the purity of chrome leading to the poor quality of the chrome tanning agent, poor economic returns, and indirect waste of resource and bring about environmental problems leading to various side effects and carcinogenic nature in water and bodies [8,9,10,11,12]
The results showed the concentration of hexavalent chromium ion in oxidized chromium solution complies with emission regulations
Summary
The environmental pollution problems involved with the emissions of tannery sludge with chromium are increasing, which bring a huge challenge for society. In spite of the fact that trivalent chromium is used to the leather tanning agent and is believed to be good for health frequently, it could be translated into carcinogenic hexavalent chromium and chrome has an effect on the soil fertility. The chromium ions will coordinate with organics, which can decrease the purity of chrome leading to the poor quality of the chrome tanning agent, poor economic returns, and indirect waste of resource and bring about environmental problems leading to various side effects and carcinogenic nature in water and bodies [8,9,10,11,12]
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