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Deep treatment method of tannery wastewater

A technology for tanning wastewater and advanced treatment, applied in animal processing wastewater treatment, water/sewage multi-stage treatment, adsorbed water/sewage treatment, etc. problems, to achieve the effect of reducing disposal costs, moderate operating costs, and prolonging the backwash cycle

Inactive Publication Date: 2015-11-18
山东省环科院环境工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, in order to meet the conditions of the Fenton reaction, the process needs to repeatedly adjust the pH value of the wastewater, the consumption of acid and alkali is large, the output of chemical sludge is high, and when the salt content in the wastewater is high, the treatment effect of this method is limited, and the removal of COD The rate is declining, and it is difficult to meet the standard stably

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Embodiment 1

[0039](1) The tannery wastewater is biochemically treated in the secondary sedimentation tank, and the effluent from the secondary sedimentation tank biochemical treatment flows to the coagulation sedimentation tank 1 for enhanced coagulation and sedimentation, and at the same time, add sodium hypochlorite at the inlet of the coagulation zone of the coagulation sedimentation tank. and polyferric chloride. The reaction time t in the coagulation zone of the enhanced coagulation sedimentation tank 1 =15min, the surface load of the sedimentation zone q=1.0m 3 / (m 2 h), effective residence time t 2 =3h;

[0040] (2) The waste water after coagulation and sedimentation is lifted to the granular activated carbon adsorption tank by the lifting pump, and the wastewater flows through the activated carbon layer from top to bottom, and the filtration speed of the empty bed of the activated carbon adsorption tank is controlled to v=2.5m / h, and the thickness of the filter layer is h=3m ,...

Embodiment 2

[0046] The advanced treatment method of the tannery wastewater of the present embodiment comprises the following steps:

[0047] (1) The effluent from the secondary sedimentation tank after biochemical treatment flows to the enhanced coagulation sedimentation tank (the enhanced coagulation sedimentation tank is the pre-oxidation contact area, coagulation reaction area and precipitation separation area from front to back), and at the same time, the pre-oxidation contact area is Add ozone to the coagulation inlet, add polyferric chloride at the coagulation inlet, the enhanced coagulation sedimentation tank pre-oxidation contact zone residence time t 1 =30min, residence time t in the coagulation reaction zone 2 = 10min, surface load q = 1.0m in the sedimentation zone 3 / (m 2 h), effective residence time t 3 =3h.

[0048] (2) The waste water after coagulation and sedimentation is lifted to the granular activated carbon adsorption tank by the lifting pump, and the wastewater fl...

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Abstract

A deep treatment method of tannery wastewater comprises the following steps: (1) leading tannery wastewater subjected to biochemical treatment into a coagulating sedimentation tank for enhanced coagulating sedimentation, and controlling SS in the effluent to be less than or equal to 30 mg / L; (3) when the filtration resistance in an activated charcoal adsorption tank rises to the set value, performing gas-water back washing from the bottom to the top; (4) when the concentration of COD in the effluent treated by the activated charcoal adsorption tank exceeds the set value, replacing activated carbon; (5) sequentially performing dewatering, drying, dry distillation and activation on replaced activated carbon to obtain regenerative activated carbon; (6) cleaning the regenerative activated carbon and supplemented new activated carbon together, and then adding the cleaned regenerative activated carbon and new activated carbon into the activated charcoal adsorption tank. The deep treatment method can reduce the concentration of COD entering activated carbon wastewater to reduce the treatment load of the activated charcoal adsorption tank, and after the coagulating sedimentation effluent is subjected to activated charcoal adsorption, the COD removal rate is about 40-70%.

Description

technical field [0001] The invention relates to a treatment method of tannery wastewater, belonging to the technical field of sewage treatment. Background technique [0002] Tannery wastewater has the characteristics of complex pollution components, high concentration of COD and total nitrogen pollutants, and large salt content. The main reason is that the concentration of COD is still relatively large, which cannot meet the requirements of wastewater discharge standards, and it is necessary to carry out advanced treatment. [0003] At present, the commonly used advanced treatment methods mainly include aeration biological filter, membrane bioreactor, coagulation sedimentation, air flotation, filtration, adsorption, oxidation method (such as: ozone oxidation, Fenton oxidation, photocatalytic oxidation, etc.), membrane separation, etc. Among them, aerated biological filter, coagulation sedimentation, filtration, advanced oxidation, etc. are widely used in advanced treatment ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/28C02F103/24
Inventor 于军康兴生苏强高磊王睿刘强
Owner 山东省环科院环境工程有限公司
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