Processing method for processing chrome-containing leather solid waste

The technology of a solid waste and a treatment method is applied in the treatment field of processing chromium-containing leather solid waste, which can solve the problems of cumbersome steps, great pollution hazards, and difficulty in leather decomposition, and achieves the effects of saving production cost and simple operation process.

Inactive Publication Date: 2015-11-11
CHANGZHOU YAHUAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem mainly solved by the present invention: Aiming at the disadvantages that the chromium salt in the leather solid waste is very harmful to the human body and aquatic organisms, the leather is difficult to decompose, and the steps in the decomposition process are cumbersome, a method for treating chromium-containing leather solid waste is provided. Object handling method

Method used

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Examples

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preparation example Construction

[0024] The preparation steps of described modified titanium dioxide are:

[0025] (2) First take 8-12g of titanium dioxide, 25-30ml of platinum chloride solution with a mass concentration of 0.6mol / L and 3-5g of sodium dodecylbenzenesulfonate and mix them evenly; (2) Then take 5-6g of dodecylbenzenesulfonate Slowly add potassium aluminum sulfate water into the above mixture, adjust the temperature to 85-95°C until the liquid evaporates completely; (3) Finally, the solid obtained after the above evaporation is filtered, washed with deionized water, dried, roasted, and ground into powder.

[0026] The preparation steps of described Penicillium rugosa fermented liquid are:

[0027] (1) Penicillium rugosa is inoculated in sterile CYA, cultured for 20-24 hours at a temperature of 28-38°C, 100-120rpm, and pH 6-7.2, to obtain the seed liquid of Penicillium rugosa;

[0028] (2) Pour 10% to 20% of the inoculation amount of Penicillium rugosa seed solution into a 100L fermenter, at a ...

example 1

[0032] First take 800g of leather solid waste, put it into a pulverizer, and pulverize it into particles with a diameter of 10mm; then put the pulverized particles on the vibrating molecular sieve loaded with modified titanium dioxide, place the vibrating molecular sieve in the container, Add 200 mL of sodium hydroxide solution with a mass fraction of 0.5 mol / L and heat to 45°C for 30 minutes, then start the vibrating molecular sieve for 5 minutes, and then let it stand for 10 minutes; then put the particles on the vibrating molecular sieve in a sealed fermentation tank, Add 300g of activated sludge from a domestic sewage treatment plant, 100mL of Penicillium rugosa fermentation broth and 100g of sea mud and mix evenly. Keep the temperature at 24°C and ferment for 15 hours. During this period, open the sealed fermentation tank every three hours and aerate for 10 minutes; finally Heat the remaining liquid in the above container to 100°C until the liquid evaporates completely, th...

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PUM

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Abstract

The invention relates to a processing method for processing chrome-containing leather solid waste, and belongs to the technical field of chemical engineering and the environment. According to the method, firstly, chromium salt in leather is eliminated through a sodium hydroxide solution and modified titanium dioxide; then the chromium slat is recycled through high-temperature evaporation; and finally, decomposition of the leather is accelerated through high-temperature fermentation of a mixture of activated sludge, penicillium raciborskii fermentation liquid and sea mud of sewage treatment plants, and nutrient-rich soil fertilizer is formed. The processing method is simple and easy to implement in the actual operation process and does no harm to human bodies and the environment; the nutrient-rich soil fertilizer is formed in the leather decomposition process; the waste is utilized; and the soil fertilizer reaches the use standard of agricultural fertilizer, and the decomposition rates reaches up to 92% or above.

Description

technical field [0001] The invention relates to a treatment method for treating chromium-containing leather solid waste, which belongs to the technical field of chemical industry and environment. Background technique [0002] In addition to wastewater pollution in the tanning industry, there are also solid waste pollution from different process stages, such as slag, shredded leather, trimming scraps, chrome tanned leather grinding and smoothing leather scraps, etc., as well as tanning sludge and sediment. The world produces 600,000 to 800,000 tons of leather solid waste every year, 75% of which are chromium-containing chromium leather scraps. In my country, the annual discharge of leather solid waste is about 280,000 tons, of which 70% is Chromium waste. If not recycled, some of the chromium ions in it end up in the water. Trivalent chromium ions are protein coagulants, which can stimulate the human digestive tract, respiratory tract and skin. High concentration of trival...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00
Inventor 雷春生张帆
Owner CHANGZHOU YAHUAN ENVIRONMENTAL PROTECTION TECH
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