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Treatment method of waste water in leather industry

A technology for industrial wastewater and treatment methods, applied in the directions of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve problems such as failure to achieve the ideal state, achieve stable and reliable effluent quality, and operate The process is simple and the effect of reducing the occupied area

Inactive Publication Date: 2013-04-17
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Over the years, people have used various methods to treat various sewage in leather production, but in the end they still cannot achieve the ideal state

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0029] The tannery industrial wastewater is sent to the grid pool to filter the impurities in the wastewater; the filtered wastewater is injected into the regulating tank equipped with an aeration device, and the wastewater in the pool is homogenized; the wastewater discharged from the regulating tank is injected into the The air flotation tank removes suspended solid particles and substances after scraping slag by air flotation; the wastewater is injected into the reaction tank, and the pH value is adjusted to 9, and polyaluminum chloride and polyacrylamide are added to the reaction tank to flocculate and settle the wastewater; Add a strong oxidant to the wastewater after particle removal, and stir to make it fully react; after the reaction is complete, it enters the hydrolytic acidification tank for hydrolytic acidification, and the residence time of hydrolytic acidification is 2.5 hours; after hydrolysis and acidification, the effluent is subjected to biochemical treatment; ...

example 2

[0031] The tannery industrial wastewater is sent to the grid pool to filter the impurities in the wastewater; the filtered wastewater is injected into the regulating tank equipped with an aeration device, and the wastewater in the pool is homogenized; the wastewater discharged from the regulating tank is injected into the The air flotation tank removes suspended solid particles and substances after scraping slag by air flotation; the wastewater is injected into the reaction tank, and the pH value is adjusted to 9.5, and polyaluminum chloride and polyacrylamide are added to the reaction tank to flocculate and settle the wastewater; Add a strong oxidant to the wastewater after particle removal, and stir to make it fully react; after the reaction is complete, it enters the hydrolytic acidification tank for hydrolytic acidification, and the residence time of hydrolytic acidification is 3.0 hours; after hydrolysis and acidification, the effluent is subjected to biochemical treatment;...

example 3

[0033] The tannery industrial wastewater is sent to the grid pool to filter the impurities in the wastewater; the filtered wastewater is injected into the regulating tank equipped with an aeration device, and the wastewater in the pool is homogenized; the wastewater discharged from the regulating tank is injected into the The air flotation tank removes suspended solid particles and substances after scraping slag by air flotation; the wastewater is injected into the reaction tank, and the pH value is adjusted to 10, and polyaluminum chloride and polyacrylamide are added to the reaction tank to flocculate and settle the wastewater; Add a strong oxidant to the wastewater after particle removal, and stir to make it fully react; after the reaction is complete, it enters the hydrolytic acidification tank for hydrolytic acidification, and the residence time of hydrolytic acidification is \3.0 hours; after hydrolysis and acidification, the effluent is subjected to biochemical treatment;...

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PUM

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Abstract

The invention discloses a treatment method of waste water in the leather industry. The method comprises the following sequential steps of filtering, homogenizing, floating, scraping slag, adding acid and a flocculating agent for precipitation, oxidizing, hydrolyzing, acidizing, precipitating, filtering, and discharging. The method adopts a hollow fiber membrane component to substitute a secondary precipitation tank in the traditional technology, so that the floor area of a treatment system is reduced; in addition, the method solves the problem of sludge bulking in the traditional suspended activated sludge technology; the effluent quality is stable and reliable; and the operation process is relatively simple and convenient.

Description

technical field [0001] The invention discloses a treatment method for leather industry wastewater, which belongs to the field of sewage treatment. Background technique [0002] Leather is denatured and non-perishable animal skin obtained through physical and chemical processing such as depilation and tanning. Leather is composed of natural protein fibers tightly woven in three-dimensional space. There is a special grain layer on the surface, which has natural grain and luster, and feels comfortable. Goat fur is a high-grade raw material. The pores of goat skin are in the shape of "tiles" in rows. The surface is fine and the fibers are tight. There are a large number of fine pores arranged in a semicircle and the hand feels tight. It is mostly used to make shoe upper leather, clothing leather, glove leather, wallets and some women's bags. Very popular with consumers. [0003] Most of the wastewater in the leather manufacturing industry comes from the preparation stage and ...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 黄勇
Owner CHANGZHOU UNIV
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