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Treatment method of dairy product wastewater

A dairy product wastewater and treatment method technology, applied in the field of dairy product wastewater treatment, can solve the problems of secondary pollution, increased treatment costs, inability to completely degrade protein and fat, etc., achieve less residual sludge, low energy consumption, and reduce secondary pollution. Effects of Secondary Pollution and Treatment Costs

Active Publication Date: 2018-05-11
惠州市合新科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have some disadvantages. For example, the coagulation method will produce sludge, which will cause secondary pollution and increase the treatment cost; while anaerobic and aerobic treatment cannot completely degrade protein and fat, and a large amount of ammonia nitrogen will be produced in the process of protein degradation. , increasing the processing difficulty

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  • Treatment method of dairy product wastewater

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Effect test

Embodiment 1

[0034] The milk powder configuration simulated dairy wastewater is used as the treatment object, and its COD concentration is 3000mg / L, and the total nitrogen concentration is 70mg / L. First flow it into the isoelectric point sedimentation tank 1 to remove casein, part of whey protein and fat. After this step, it is measured that the COD concentration of the wastewater is reduced to 2100-2300 mg / L, and the total nitrogen concentration is reduced to 13-17 mg / L. Then it flows into the filter tank 2, and after filtering the suspended solids, the waste water enters the two-stage anaerobic fermentation reaction tank 3. The wastewater first enters the hydrogen-producing anaerobic fermentation reaction tank 31, and the residence time of the wastewater is 12 hours. The COD concentration drops to 1700-2100 mg / L, and the total nitrogen concentration drops to 11-16 mg / L. Then the wastewater enters the methane-producing anaerobic fermentation reaction tank 32, the residence time of the was...

Embodiment 2

[0036] Taking the actual dairy wastewater as the treatment object, its COD concentration is 1800mg / L and the total nitrogen concentration is 50mg / L. Firstly, the waste water is passed into the isoelectric point sedimentation tank 1 to remove casein, some whey protein and fat, and the COD concentration of the waste water is reduced to 1200-1400 mg / L, and the total nitrogen concentration is reduced to 10-13 mg / L. The waste water then flows into the filter tank 2, and after filtering the suspended solids, the waste water enters the two-stage anaerobic fermentation reaction tank 3. The waste water first enters the hydrogen-producing anaerobic fermentation reaction tank 31 , the residence time of the waste water is 12 hours, the COD concentration drops to 1000-1200 mg / L, and the total nitrogen concentration drops to 9-12 mg / L. The waste water enters the methane-producing anaerobic fermentation reaction tank 32, and its residence time is 24 hours, the COD concentration further drops...

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Abstract

The invention discloses a treatment method of dairy product wastewater. The method comprises the steps of isoelectric point precipitation, filtering, two-stage fermentation reaction, denitrification and nitrosification. According to the treatment method of the dairy product wastewater, disclosed by the invention, casein is extracted through isoelectric point precipitation and can be recycled; a two-stage anaerobic fermentation reaction tank is used for producing clean energy, i.e., hydrogen gas and methane, so as to obtain available resources. Only a denitrification filter tank and a nitrosification filter tank need slight aeration, the energy consumption is low, produced surplus sludge is little, and the secondary pollution and treatment cost are reduced.

Description

technical field [0001] The invention relates to the technical field of dairy wastewater treatment, in particular to a dairy wastewater treatment method. Background technique [0002] During the production of dairy products, a large amount of wastewater will be produced. The chemical oxygen demand (COD) of wastewater is 1000-5000mg / L, which exists in the form of protein, fat and lactose, and the total nitrogen content is between 60-120mg / L. protein form. The dairy industry water pollutant discharge standard is that COD should not exceed 100mg / L, and the total nitrogen content should not exceed 30mg / L. If it is discharged directly without treatment, it will cause water pollution and nutrient loss. [0003] Dairy waste water is usually treated by physical and chemical treatment methods such as oil separation, sedimentation, coagulation air flotation, electrochemical flocculation, and biochemical treatment methods such as biological filter, contact oxidation, aeration tank, oxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/32
CPCC02F1/001C02F1/66C02F3/305C02F3/34C02F9/00C02F2103/32C02F2203/006C02F2209/02C02F2209/06C02F2209/08C02F2209/16C02F2209/22C02F2209/44C02F2301/046C02F2303/06C02F2303/10
Inventor 陈志伟陈佛颂徐瑞娥
Owner 惠州市合新科技有限公司