Leather wastewater treating method

A treatment method and technology for leather wastewater, which can be used in animal processing wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., and can solve the problems of thick odor, high chroma, and high oil content of wastewater

Inactive Publication Date: 2013-11-13
SANDA FILM SCI & TECH XIAMEN
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Problems solved by technology

[0005] The main characteristics and treatment difficulties of wastewater: due to the use of a large amount of organic raw materials in the production process, the content of organic matter in the wastewater is high; due to the use of dyes, tanning agents and other auxiliary agents in the production,

Method used

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Embodiment Construction

[0022] Concrete embodiment of the present invention, its flow process refers to figure 1 .

[0023] The reaction tank is used to precipitate chromium, and the total chromium content in the effluent is controlled below 1.5mg / L by using the reduction precipitation method (adding sodium sulfite and caustic soda)

[0024] The wastewater from the reaction tank is sent to the sludge filter press. After the filter press, the filtrate is sent to the adjustment tank, and the chrome sludge is sent to the hazardous waste center for treatment.

[0025] The grid pool is used to intercept sundries, minced meat, fur and so on. It can be set that the distance between the first level mechanical grille should not exceed 40mm. The second-level curved fine grid is not greater than 10mm.

[0026] The regulating pool is used to adjust the water quantity and quality, and the PH value of the incoming water is adjusted to 7-8.

[0027] The air flotation tank is used for oil treatment in wastewater...

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Abstract

The invention discloses a leather wastewater treating method, comprising the following steps: (1) allowing chromium-containing wastewater to enter into a reaction tank for a reaction, subjecting settled sludge to press filtration with a filter press, separating chromium mud for separate treatment and allowing an obtained filtrate to enter into a regulating tank; (2) filtering rest wastewater (raw hide and skin washing water containing high-concentration Cl, alkaline depilation liming wastewater containing calcium and sulfur and degreasing wastewater containing grease and other saponified matters) with gratings and then allowing the rest wastewater to enter into the regulating tank; (3) adjusting the wastewater in the regulating tank (to a pH value of 7 to 8) and delivering the wastewater to an air floatation tank; (4) removing grease in the air floatation tank through air floatation, delivering obtained sludge to a sludge tank and allowing obtained liquid to enter into an anoxic tank for treatment; (5) allowing wastewater treated in the anoxic tank to enter into an aerobic tank; and (6) allowing wastewater treated in the aerobic tank to enter into a secondary sedimentation tank for treatment so as to obtain wastewater according with emission standards. With the method, the wastewater reaches national emission standards.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a leather wastewater treatment method. Background technique [0002] Leather production can be divided into two parts, wet operation and dry operation. The wet operation is mainly the preparation section and the tanning section, and the dry operation is mainly the finishing section. The production links and their main pollutants are shown in the table below. [0003] [0004] Source of wastewater: Production wastewater is mainly composed of the following parts: raw hide washing water containing high concentration of Cl, alkaline depilation and liming wastewater containing calcium and sulfur, degreasing wastewater containing oil and other saponified substances, chromium containing trivalent chromium Tanning wastewater and fatliquoring dyeing wastewater, among which degreasing wastewater, dehairing and liming wastewater and chrome tanning wastewater are the most polluted. ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F11/12C02F101/30C02F103/24
Inventor 苏义鹏王锦龙林丽华王贝辉方富林蓝伟光
Owner SANDA FILM SCI & TECH XIAMEN
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