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Treatment technology and treatment system of leather waste water

A technology of leather wastewater and treatment process, which is applied in animal processing wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. It can solve the problems of non-compliance with production requirements, long processing time and difficulty in comprehensive treatment major issues

Active Publication Date: 2015-07-22
CHONGQING LONGFA LEATHER PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, as the country has higher and higher requirements on the quality of leather discharge water, and the composition of leather wastewater is more complex, including chromium-containing wastewater, sulfur-containing wastewater, dyeing wastewater and production wastewater, it is difficult to comprehensively treat, so through a single treatment It is difficult to clean the wastewater and meet the national standards, especially the national secondary water quality requirements, and the single treatment takes a long time, the efficiency is low, and it does not meet the production requirements

Method used

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  • Treatment technology and treatment system of leather waste water

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Effect test

Embodiment 1

[0081] The content of COD in the untreated leather waste water of the present invention is 3000mg / l, NH 4+ -N is 250mg / l, suspended solids is 1000mg / L and the pH value is 8.1, the amount of wastewater is 1000m3 / d.

[0082] First, the sulfur-containing wastewater in the leather wastewater is filtered through the grid area to remove impurities, then enters the sump for homogeneous treatment, and then enters the reaction tank, adding ferrous sulfate, sulfuric acid and inorganic polymer flocculant for reaction , and finally enter the sedimentation tank for sedimentation treatment to obtain sulfur-containing treated water;

[0083] The chromium-containing wastewater in the leather wastewater first passes through the second grid area to filter out impurities, then enters the second sump for homogeneous treatment, and then enters the second reaction pool, adds sodium hydroxide for reaction, and finally enters the Sedimentation treatment is carried out in the second sedimentation tan...

Embodiment 2

[0089] The content of COD in the untreated leather waste water of the present invention is 3000mg / l, NH 4+ -N is 250mg / l, suspended solids is 1000mg / L and the pH value is 8.1, the amount of wastewater is 1000m3 / d.

[0090] First, the sulfur-containing wastewater in the leather wastewater is filtered through the grid area to remove impurities, then enters the sump for homogeneous treatment, and then enters the reaction tank, adding ferrous sulfate, sulfuric acid and inorganic polymer flocculant for reaction , and finally enter the sedimentation tank for sedimentation treatment to obtain sulfur-containing treated water;

[0091] The chromium-containing wastewater in the leather wastewater first passes through the second grid area to filter out impurities, then enters the second sump for homogeneous treatment, and then enters the second reaction pool, adds sodium hydroxide for reaction, and finally enters the Sedimentation treatment is carried out in the second sedimentation tan...

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Abstract

The invention provides treatment technology of leather waste water. The treatment technology comprises the following steps: 1, firstly, filtering sulfur-containing waste water and chromium-containing waste water of leather waste water to remove foreign materials, respectively; performing homogenizing treatment, then performing reaction, and finally performing precipitation treatment to obtain sulfur-containing waste water and chromium-containing waste water; 2, performing homogenizing treatment and aeration treatment to other production waste water and the obtained sulfur-containing waste water and chromium-containing waste water, reacting the obtained waste water with manganese sulfate, adding a flocculating agent; and performing flocculation precipitation treatment to obtain mixed treated water and primary precipitation mud; 3, performing hydrolytic acidification treatment to the mixed treated water, and performing intermediate precipitation treatment to obtain intermediate treated water and intermediate precipitation mud; and 4, performing bio-contact oxidation treatment to the intermediate treated water, and performing intermediate precipitation treatment to obtain treated leather waste water and secondary precipitation mud.

Description

technical field [0001] The invention relates to a treatment process and system for leather wastewater, belonging to the field of industrial sewage treatment. Background technique [0002] With the rapid development of the leather industry in recent years, leather wastewater has become one of the important sources of pollution. According to statistics, there are currently more than 20,000 large, medium and small tanneries in my country, with an annual discharge of 80-120 million tons of wastewater, accounting for about 0.3% of the total industrial wastewater in the country. The discharged Cr in these wastewaters is about 3,500 tons, suspended solids are 120,000 tons, COD is 180,000 tons, and ammonia nitrogen is 100,000 tons. With the development of economy and society and the improvement of people's requirements for environmental protection, the treatment of leather wastewater has attracted more and more attention. [0003] The wastewater generated in the leather production...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/24
Inventor 何裕华
Owner CHONGQING LONGFA LEATHER PROD
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