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Method for treating heavy metal chromium in tanning wastewater

A technology for tanning wastewater and treatment method, which is applied in animal processing wastewater treatment, flotation water/sewage treatment, adsorption water/sewage treatment, etc., can solve the problems of complex operation, high operating cost, poor treatment effect, etc. Simple operation steps and low cost effect

Active Publication Date: 2016-01-06
中广核环保产业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main technical problem to be solved by the present invention is to add quicklime to the tannery wastewater or remove the chromium content of the wastewater by oxidation, but the treatment effect is not good, the water cannot be reused, and the operation is complicated and the operation cost is high. Disadvantages, a treatment method for heavy metal chromium in tannery wastewater is provided, the method is mainly to mix and ferment the prepared mixed plant extract and treated pigskin with some organic matter, and use ethyl acetate to extract, and Concentrate into a chromium treatment solution, then mix with chromium-containing wastewater in a certain proportion and aerate, so that a layer of oil stains can float on the surface of the wastewater and absorb chromium, and finally scrape off the oil stains

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] First, in parts by weight, extract 60 parts of fresh poplar leaves, 20 parts of willow leaves, and 20 parts of pothos, rinse the above-mentioned plant leaves with clear water, and place them in a 10% sodium chloride solution to soak for 40 minutes Afterwards, take it out, let it air-dry naturally, and place it in a mill and grind it into a 180-mesh powder; according to the solid-to-liquid mass ratio of 1:2, the above-mentioned powder is mixed with ethanol with a mass fraction of 65%, and placed at a speed of Stir in a magnetic stirrer at 200r / min for 30min, after the stirring is completed, extract for 6h, collect the filtrate, repeat the extraction for 4 times, combine the filtrate to obtain the mixed plant extract, and set aside; take 2kg of fresh pigskin, and Put it in a grinder and pulverize it into 80-mesh pigskin powder, put it in the above-mentioned mixed plant extract, wherein the mass ratio of pigskin powder and plant mixed extract is 1:1, stir and mix evenly, an...

example 2

[0022] First, in parts by weight, extract 40 parts of fresh poplar leaves, 30 parts of willow leaves, and 30 parts of pothos, rinse the above-mentioned plant leaves with clear water, and place them in a 10% sodium chloride solution to soak for 40 minutes Afterwards, take it out, let it air-dry naturally, and place it in a mill and grind it into a 260-mesh powder; according to the solid-to-liquid mass ratio of 1:2, the above-mentioned powder is mixed with ethanol with a mass fraction of 65%, and placed at a speed of Stir in a 200r / min magnetic stirrer for 30min, after the stirring is completed, extract for 6h, collect the filtrate, repeat the extraction for 4 times, combine the filtrate to obtain a mixed plant extract, and set aside; take 1kg of fresh pigskin, put Put it in a pulverizer and pulverize it into 70 mesh pigskin powder, put it in the above-mentioned mixed plant extract, wherein the mass ratio of pigskin powder and plant mixed extract is 1:1, stir and mix evenly, and ...

example 3

[0024] First, in parts by weight, extract 45 parts of fresh poplar leaves, 25 parts of willow leaves, and 30 parts of pothos, rinse the above-mentioned plant leaves with clear water, and place them in a sodium chloride solution with a mass fraction of 8% for 35 minutes Afterwards, take it out, let it air-dry naturally, and place it in a mill and grind it into a 200-mesh powder; according to the solid-to-liquid mass ratio of 1:2, the above-mentioned powder is mixed with ethanol with a mass fraction of 65%, and placed at a speed of Stir in a magnetic stirrer at 150-200r / min for 25 minutes. After the stirring is completed, extract for 5 hours, collect the filtrate, repeat the extraction for 3 times, and combine the filtrate to obtain a mixed plant extract, which is set aside; take 1kg of fresh pigskin , place it in a pulverizer and pulverize it into 75-mesh pigskin powder, place it in the above-mentioned mixed plant extract, wherein the mass ratio of pigskin powder and plant mixed...

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PUM

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Abstract

The invention relates to a method for treating heavy metal chromium in tanning wastewater, belonging to the technical field of wastewater treatment. The method comprises the main steps of carrying out mixed fermentation on the prepared mixed plant extracting solution, treated pig skin and some organic matters, extracting by using ethyl acetate, and concentrating to form a chromium treating solution; then, mixing the chromium treating solution and chromium-containing wastewater according to a certain ratio, aerating to ensure that a layer of oil stains is floated on the surface of the wastewater, and adsorbing chromium; and finally, scrapping the oil stains. The method has the beneficial effects that the chromium content of the treated wastewater is reduced from 60-1500mg / L to 0.4-0.5mg / L, and the removal rate is up to more than 99%; and meanwhile no chemical agents are utilized so that no secondary environment pollution is caused.

Description

technical field [0001] The invention relates to a method for treating heavy metal chromium in tanning wastewater, belonging to the technical field of wastewater treatment. Background technique [0002] The tanning industry has become one of the high water consumption and heavy pollution industries in the light industry, second only to the paper industry. Taking cowhide tanning as an example, it takes 0.8-1.0 tons of water to process and produce a piece of cowhide. At present, my country's leather industry discharges 80-120 million tons of wastewater into the environment every year, accounting for about 0.3 of the total industrial wastewater discharge in the country. %. The tanning process mainly includes degreasing, deashing, softening, chrome tanning, retanning, neutralization, dyeing and color fixing, and water washing. Among them, chrome tanning and retanning processes usually use a large amount of chrome-containing tanning agents (such as chrome powder) , the neutraliza...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F1/24C02F103/24C02F101/20
Inventor 梅庆波薛红娟宋国
Owner 中广核环保产业有限公司