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Processing method for leatherworking waste water

A treatment method and technology for processing wastewater, applied in water/sewage multi-stage treatment, oxidized water/sewage treatment, water/sludge/sewage treatment, etc. The effect of running costs

Inactive Publication Date: 2012-10-10
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
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Problems solved by technology

However, with the improvement of emission standards (CODcr<50mg / L), there is no corresponding treatment technology in China

Method used

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  • Processing method for leatherworking waste water

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Embodiment 1

[0025] The leather processing sewage after the biochemical treatment was taken for the test. This sewage COD cr 94mg / l, pH=7.5. The sewage is subjected to advanced treatment by adopting the treatment process of the present invention. First, add 2 mg / l potassium ferrate (oxidant) and 10 mg / l polyaluminum chloride (aluminum coagulant) to the sewage to react for 10 minutes, use the oxidant to degrade the organic matter in the sewage, and at the same time dissolve the water-soluble Pollutants are oxidized to be insoluble in water, which is convenient for coagulation and separation by aluminum-based coagulants.

[0026] Wastewater enters the first separation flow reactor for 5-30 minutes of oxidative adsorption baffle reaction, and then enters the sand filter for solid-liquid separation. The filtration rate of the filter is 5-6m / h; the flocculant PAM can be added for solid-liquid separation. To enhance the flocculation effect, the dosage is 2-8mg / l.

[0027] Wastewater after so...

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Abstract

The invention discloses a processing method for leatherworking waste water, comprising the following main steps: 1) adding 3-10 mg / l oxidizing agent in the leatherworking waste water, simultaneously or sequentially adding 5-25 ml / g Al-system coagulant to conduct oxidation adsorption baffling reaction; 2) carrying out solid-liquid separation on the effluent obtained by the step 1); and 3) adding fluorine-containing oxidizing agent in the effluent obtained by the step 2) with the additional amount of available chlorine being 5-50 mg / l to conduct oxidation reaction, and then discharging. The method disclosed herein can reduce the influence of pollution discharge on environment without obvious increase of investment and operation cost. The CODcr of the waste water processed by the method of the invention is less than 50mg / L.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to an advanced treatment method for leather processing wastewater. Background technique [0002] The main processes of leather processing include retanning, dyeing, neutralization, degreasing, etc. During the processing, the sewage CODcr: 1200-3000mg / L, ammonia nitrogen: 10-100mg / L. Therefore, the sewage has good biodegradability. The main process of sewage treatment is: sedimentation-coagulation air flotation-anaerobic-aerobic-sand filtration, etc. After this process, the effluent CODcr is 90-120mg / L, ammonia nitrogen; 10-30mg / L. However, with the improvement of emission standards (CODcr<50mg / L), there is no corresponding treatment technology in China. Contents of the invention [0003] The object of the present invention is to provide a kind of processing method of leather processing waste water, to reach discharge requirement (GB18918-2002 grade A standard),...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/72C02F1/76
Inventor 高迎新赵云丁然张昱杨敏
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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