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Leather wastewater treatment method

A technology of leather wastewater and treatment method, which is applied in animal processing wastewater treatment, water/sewage treatment, special compound water treatment, etc., can solve the problems of substandard chroma and difficult biodegradation.

Inactive Publication Date: 2018-05-04
苏州天亦辰针织有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims at the above technical problems, overcomes the shortcomings of the prior art, provides a leather wastewater treatment method, and solves the problems of difficult biodegradation and substandard chroma in the leather wastewater treatment process.

Method used

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  • Leather wastewater treatment method

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Effect test

Embodiment 1

[0026] A method for treating leather wastewater, comprising the steps of:

[0027] a, get leather waste water 1000kg, first carry out the filtration of solid particulate matter to leather waste water, first filter through filter screen, then pass through the secondary filtration of macroporous adsorption resin, remove solid particle and part organic solvent in leather waste water;

[0028] b. Add sulfuric acid to the filtered leather waste water, adjust the pH value to PH=3, then add Fenton's reagent to carry out decolorization treatment, including 10kg of 30% H 2 o 2 React with ferrous sulfate under the irradiation of ultraviolet lamp while stirring, and the ultraviolet lamp is kept 10cm away from the liquid level of leather wastewater;

[0029] c. Add 10% Ca(OH) to the leather wastewater after decolorization treatment 2 solution to remove the lower precipitate;

[0030] d. Put the filtered leather waste water in the reactor for chemical precipitation and dephosphorization...

Embodiment 2

[0036] A leather wastewater treatment method, the difference between this embodiment and embodiment 1 is that the pH value in step c is 10.

Embodiment 3

[0038] A leather wastewater treatment method, the difference between this embodiment and embodiment 1 and embodiment 2 is that the pH value in step d is 11.

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Abstract

The invention discloses a leather wastewater treatment method and relates to the field of leather production. The leather wastewater treatment method comprises the following steps: filtering leather wastewater; adjusting the wastewater until the pH (Potential of Hydrogen) to be 3; adding a Fenton reagent and de-coloring; irradiating by an ultraviolet lamp to react; adding a Ca(OH)2 solution and removing lower-layer sediment; adding a chemical agent and removing phosphate sediment; adjusting the wastewater until the pH is greater than or equal to 11 and the temperature to be 80 DEG C; carryingout alkaline hydrolysis reaction at room temperature; adjusting the pH until the pH is greater than or equal to 11 and adjusting the temperature to be 50 DEG C, and then carrying out deamination; adding a flocculation precipitation agent into the leather wastewater to enable the leather wastewater to form a solid-liquid layered state; separating supernatant and lower-layer red solid substances ofthe precipitated wastewater; finally, carrying out biochemical treatment on the treated leather wastewater. By adopting the leather wastewater treatment method, COD (Chemical Oxygen Demand) can be effectively removed and the chroma of the wastewater can be effectively reduced.

Description

technical field [0001] The invention relates to the field of leather production, in particular to a method for treating leather wastewater. Background technique [0002] Leather comprehensive wastewater has the characteristics of high chroma, high suspended solids, and high organic matter concentration. It is a kind of industrial wastewater with serious pollution and difficult treatment. If it is discharged directly without treatment, it will definitely cause serious harm to the surrounding environment. At present, all enterprises basically adopt a combination of physicochemical and biochemical treatment for the treatment of leather comprehensive wastewater. However, most engineering practices have proved that the treatment of leather comprehensive wastewater by combining physical and chemical first and then biochemical, there are still many refractory organic pollutants in the effluent and the chromaticity is not up to the standard, so it is necessary to carry out advanced ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/24C02F101/22
CPCC02F1/32C02F1/5245C02F1/66C02F1/722C02F1/725C02F3/00C02F7/00C02F9/00C02F2101/22C02F2103/24C02F2305/026
Inventor 凌小妹金辉金佳斌
Owner 苏州天亦辰针织有限公司
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