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Method for wastewater zero discharging of leather industry

A technology of industrial waste water and zero discharge, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve environmental pollution and other problems, reduce suspended solids content, reduce COD and Effect of BOD load and effluent stabilization

Inactive Publication Date: 2015-12-30
QINGDAO LANNONGGU AGRI PROD RES & DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the problems in these two aspects cannot be effectively solved, especially the problem of environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for zero discharge of tannery industrial waste water, characterized in that it comprises the steps of:

[0020] (1) Cowhide pretreatment: Take salted yellow cowhide and add 2 times of water, 0.05% polyaluminium chloride and 0.3% fungicide, control the temperature at 22°C for 6 hours, and rotate the drum intermittently for 30 minutes;

[0021] (2) Softening treatment: Add 20% lye solution composed of sodium bisulfite and caustic soda according to the weight ratio of 1:3 to the cowhide after the above treatment, adjust the pH value to 7, and filter the wool after rotating for 50 minutes. Wash twice under the condition that the water volume reaches 1 times;

[0022] (3) Oxidation and aeration treatment: According to the water inflow of 70%, the water is fed from the bottom, and the low-pressure mixed-flow jet aeration is adopted. The dissolved oxygen is controlled at 0.8mg / L and fully mixed with water and sprayed in the horizontal direction to oxygenate and aerate...

Embodiment 2

[0026] A method for zero discharge of tannery industrial waste water, characterized in that it comprises the steps of:

[0027] (1) Cowhide pretreatment: Take salted yellow cowhide and add 2 times of water, 0.05% polyaluminum chloride and 0.5% fungicide, control the temperature at 25°C for 5 hours, and rotate the drum intermittently for 30 minutes;

[0028] (2) Softening treatment: Add 20% lye solution composed of sodium bisulfite and caustic soda in a weight ratio of 1:3 to the cowhide after the above treatment, adjust the pH value to 8, and filter the wool after rotating for 55 minutes. Wash twice under the condition that the water volume reaches 1.5 times;

[0029] (3) Oxidation and aeration treatment: according to the inflow of 80% water from the bottom, low-pressure mixed-flow jet aeration is adopted, and the dissolved oxygen is controlled at 1.0mg / L, mixed with water and sprayed in the horizontal direction to oxygenate and aerate the water body. gas;

[0030] (4) Preci...

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PUM

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Abstract

The invention discloses a method for wastewater zero discharging of the leather industry. The method is characterized by comprising the following steps of 1, cow leather preprocessing, 2, softening processing, 3, oxidation aeration processing, 4, sedimentation, and 5, filtering and oil removal. According to the softening processing in the leather manufacturing process, fur is prevented from being degraded by a chemical reducing agent, and COD and BOD loads in a depilation waste liquid are reduced. According to the oxidation aeration processing, the load impact resistance is large; the physical technology is utilized for reducing the dosage of harmful chemical substances and lowering the suspended matter content in wastewater, a solid-liquid separator is used for solid-liquid separation, and the amount of metal ions is decreased; according to the step of filtering and oil removal, oil components are removed, the processing efficiency is high, it is ensured that water flows out stably, the water quality is reliable, resources are saved, and the environment is protected.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a method for zero discharge of tanning industrial wastewater. Background technique [0002] Tannery wastewater is composed of strongly alkaline liming and dehairing wastewater and weakly acidic tanning wastewater. The wastewater contains high concentrations of tanning materials, chlorides, sulfides, surfactants, chemical additives, oils, proteins and SS, etc. Pollutants: The mixed wastewater is alkaline, turbid in appearance, and has an unpleasant smell, and the water quality and quantity vary greatly with time. [0003] Tannery wastewater has good biochemical properties and can generally be treated by biochemical methods. However, wastewater often contains sulfide and chromium ions, which will inhibit microorganisms, so we must pay full attention to the role of pretreatment, so in the treatment of tannery wastewater, the combined process of "physicochemical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 宋波
Owner QINGDAO LANNONGGU AGRI PROD RES & DEV
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