Novel tannery wastewater treatment process

Abstract

The invention provides a novel tannery wastewater treatment process which comprises the steps that unhairing liming wastewater and chrome tanning wastewater are conveyed to a grid at the same time, and mixed wastewater treated by the grid is conveyed to a coagulating basin; carrying out air floatation treatment on degreased wastewater, carrying out grid treatment on the wastewater subjected to airfloatation, conveying the treated wastewater to a Fenton tank, carrying out advanced oxidation treatment, removing heavy metal ions in the wastewater, conveying the mixed wastewater to an MFC-iron-carbon coupling tank, carrying out degradation treatment, and finally, carrying out conventional biochemical treatment.

Description

technical field

[0001] The invention belongs to the field of waste water treatment, and in particular relates to a novel process for treating tannery waste water. Background technique

[0002] The tanning industry consumes a large amount of fresh water resources and discharges a large amount of tanning wastewater, which poses a serious threat to human health and the sustainable development of the entire society. The wastewater discharged by the tanning industry has problems such as high concentration of organic pollution, large amount of suspended matter, large water volume, and complex wastewater components, which contain toxic substances such as sulfur and chromium.

[0003] In the tanning industry, animal skins are usually salted or soaked in water to make them swollen, then limed, fleshed, dealkalized, then tanned or chromed, tanned and fattened to soften, and finally dyed and processed to make leather. Tannery wastewater Usually SS 1500-1600mg / L, BOD700-3000mg / L. In t...

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