Method for processing wash water in stock preparation by straw pulp wet method

A technology of wet material preparation and treatment method, which is applied in the direction of processing wastewater treatment, water/sewage multi-stage treatment, flotation water/sewage treatment, etc. It can solve the problem of increasing the sediment content of cooking black liquor and increasing the load of middle-stage wastewater treatment , affect the effect of wastewater treatment and other issues, to achieve good water treatment effect, smooth air flotation and mud discharge, and reduce the effect of sediment content

Inactive Publication Date: 2009-06-24
YUANJIANG PAPER
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Problems solved by technology

Due to the limited treatment capacity of the middle-stage wastewater, it will inevitably increase the treatment load of the middle-stage wastewater and affect the treatment effect of the wastewater. At the same time, it will increase the sediment content in the cooking black liquor and interfere with the alkali recovery system.

Method used

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with embodiment. This embodiment is a treatment method for the reed washing water produced by wet preparation in the reed pulp workshop.

[0016] A kind of straw pulp wet method stock preparation washing water treatment method, it comprises the steps:

[0017] (1) Inclined screen filtration, the reed washing water CODcr content that fine grid comes is 2000mg / l~5000mg / l, and SS content is 2000mg / l~4000mg / l (the present embodiment is that CODcr content is 3800mg / l, SS content 2600mg / l), and filtered through a 60-mesh inclined screen to remove suspended particles above 60 mesh. After filtration, the effluent enters the buffer tank, and the filtered suspended matter is transported out of the landfill by car. After filtration, the CODcr content of the effluent is 1800mg / l~ 4800mg / l, SS content is 1600mg / l~3600mg / l (this embodiment is CODcr content is 3560mg / l, SS content is 2230mg / l);

[0018] (2) Chemica...

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Abstract

The invention discloses a method for treating scouring water of stock preparation by a straw pulp wet method. The method comprises the following steps: (1) an inclined wire is used for filtration, and filtered water enters a buffer pool; (2) chemical reaction is performed, wherein the water in the buffer pool is sent to a catchment reaction pool by a lift pump, and a flocculating agent is added to a transfer piping in front of the lift pump; and (3) waste water after reaction enters a flotation tank for air floating through the lift pump, a polyacrylamide solution is added to an outlet of the lift pump, and the water after air floating treatment is drained to a trench or is recycled for wet stock preparation. Compared with the medium wastewater treatment, the method has simple process and equipment, can become a treatment unit independent of medium wastewater, and can flexibly adapt to the fluctuation of yield in production, not only meet production requirement, but also achieve the aim of environmental protection, thereby reducing load of treating the medium wastewater, reducing the sediment content in stewed black liquor, and reducing interference to an alkali reclaim system. The method has the advantages of good effect of water treatment and lower operation cost, and the treatment cost of 1 ton of water is between 0.5 and 2.3 Yuan.

Description

Technical field: [0001] The invention relates to a sewage treatment method, in particular to a treatment method for straw pulp wet preparation and washing water. Background technique: [0002] Pulping and papermaking wastewater has become the top priority in water treatment due to its large discharge and serious pollution. The improvement of pulping and papermaking technology and equipment, the treatment and comprehensive utilization of wastewater are closely related to the promotion of my country's ecological environment protection and the sustainable development of the paper industry, and are related to the completion of the emission reduction task of my country's main pollutants. At present, a large amount of washing wastewater (chemical oxygen demand CODcr content is 2000-5000mg / l, suspended solids SS content is 2000-4000mg / l) produced in the wet preparation of straw pulp is not treated, but is directly sent to the middle section deal with. Due to the limited treatment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/52C02F1/24C02F103/28
Inventor 喻益伟刘立新周兵
Owner YUANJIANG PAPER
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