Method for reducing hexavalent chromium in water by biological waste

Abstract

The invention provides a method for reducing hexavalent chromium in water by biological waste, comprising the following steps: drying and crushing white spirits distillers' grains and beer distillers' grains produced by a brewery for later use; adjusting the pH value of chromate waste water to be acidic by H2SO4; fully mixing the distillers' grains with waster water according to the solid-liquid ratio of 6-10g/L, and processing for 24h at room temperature; filtering to lead the solid to be separated from the liquid; and measuring Cr(VI) content and the total Cr content in filtered water by analyzing a sample. The invention can effectively remove Cr(VI) (being converted into Cr(III) and/or being absorbed) in water, low the total Cr content (being absorbed), achieves the dual purposes of toxicity attenuation and decontamination, and provides a novel Cr(VI) waste water treatment way. The above processing method has the advantages of simple process, convenient operation, environment protection, cheap raw materials and low running cost and easy popularization, and provides a way for the resource recycling of the distilled grains.

Description

technical field [0001] The invention relates to a method for reducing and treating hexavalent chromium in water by using waste biological materials. Specifically, the hexavalent chromium in water is reduced, transformed and adsorbed by distiller's grains, a by-product of the brewing industry, and belongs to the treatment of chromium-containing wastewater in the technical field of environmental protection. Background technique [0002] In recent years, with the rapid development of industry, water pollution has been increasing, especially the discharge of industrial wastewater containing heavy metals such as chromium (Cr), which seriously threatens the ecological environment and human health. research topic. Cr element widely exists in nature, and the common valence states of its compounds are trivalent Cr(III) and hexavalent Cr(VI). The natural source of Cr in the environment is mainly rock weathering, and most of it is Cr(III); due to the wide range of industrial uses of C...

AI Technical Summary

Problems solved by technology

As a by-product of grain fermentation and brewing, distiller's grains have a relatively large annual output in my country, and distiller's grains alone reach tens of millions of tons. Although some of them are processed into feed, some are still directly discharged without treatment and cause environmental pollution. It is necessary to fully The use of this cheap biological material, such as the application of the adsorption-reduction properties of distiller's grains to treat heavy metal ions Cr(VI) in water, has not been reported yet.

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