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System and method for treating leather wastewater

A technology for treatment system and leather wastewater, which is applied in animal processing wastewater treatment, water/sewage treatment, biological water/sewage treatment, etc. It can solve the problem of high sludge disposal and treatment costs, poor operational reliability, and large equipment footprint. and other problems, to achieve the effect of reducing the cost of hazardous waste disposal, improving the effect of coagulation reaction, and saving floor space

Inactive Publication Date: 2018-12-18
ZHEJIANG WORLD CLEAN ENVIRONMENT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods have certain advantages, but also have their disadvantages, such as long treatment time, complex process, large equipment footprint, cumbersome operation, poor operation reliability, and generally all chromium-containing wastewater is treated together, resulting in chromium-containing wastewater. There is a lot of sludge, and the cost of sludge disposal is high

Method used

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  • System and method for treating leather wastewater
  • System and method for treating leather wastewater
  • System and method for treating leather wastewater

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Embodiment 1

[0037] Such as figure 1 As shown, a leather wastewater treatment system provided in this embodiment includes a sequentially connected pretreatment unit, a coagulation air flotation treatment unit, an A / O biochemical treatment unit, an MBBR tank 16 and a third sedimentation tank 17,

[0038] Wherein the pretreatment unit includes a high-concentration chromium-containing wastewater treatment unit and a low-concentration chromium-containing wastewater treatment unit. Pool 3 and the first sedimentation tank 4, the first sludge tank 5, the first sludge filter press 6, the low-concentration chromium-containing wastewater treatment unit includes the second grid well 7 and the second regulating tank 8 connected in sequence , the second reaction tank 9 and the second sedimentation tank 10, the first reaction tank 3 and the second reaction tank 9 are all provided with FeSO 4 Chemical injection port and NaOH chemical injection port, where FeSO 4 The dosage is 0.5-1.0kg / m 3 , NaOH conc...

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Abstract

The invention discloses a system for treating leather wastewater. The system comprises a pretreatment unit, a coagulation air flotation treatment unit, an A / O biochemical treatment unit, an MBBR tankand a third sedimentation tank which are sequentially connected, and a spherical suspension biological filler is added into the MBBR tank. The system and a method for treating leather wastewater adopta classified chromium removal, coagulation air flotation, A / O and MBBR treatment process, so the treatment effect of the leather wastewater is greatly improved, the treatment cost of chromium-containing sludge is reduced, and the method is a practical and feasible new leather wastewater treatment technology.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a leather wastewater treatment system and method. Background technique [0002] Leather wastewater refers to the wastewater generated during the preparation and tanning stages of leather production, that is, during wet operations. Tannery wastewater has large discharge volume, high pH value, high chroma, various types of pollutants and complex composition. The main pollutants are heavy metal chromium, soluble protein, dander, suspended solids, tannin, lignin, inorganic salts, oils, surfactants, dyes and resins. Leather processing is based on animal skin as raw material, which is completed through chemical treatment and mechanical processing. In this process, a large amount of protein and fat will be transferred to waste water and waste residue, and a large number of chemical raw materials used in the processing process, such as acid, alkali, salt, sodium sulfide, l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/10C02F11/12C02F101/22C02F103/24
CPCC02F1/001C02F1/24C02F1/40C02F1/5236C02F1/5281C02F3/105C02F3/109C02F3/30C02F7/00C02F9/00C02F11/122C02F2101/22C02F2103/24Y02W10/10
Inventor 陈宽陈勇
Owner ZHEJIANG WORLD CLEAN ENVIRONMENT ENG CO LTD