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: 2010-12-22
YUANJIANG PAPER
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] In the following, the present invention will be further described in conjunction with the embodiments. This embodiment is a treatment method for the reed washing water produced by the wet preparation of the chemical reed pulp workshop.

[0016] A straw pulp wet preparation washing water treatment method, which comprises the following steps:

[0017] (1) Oblique screen filtration, the CODcr content of the reed washing water from the fine grid is 2000mg / l~5000mg / l, and the SS content is 2000mg / l~4000mg / l (in this example, the CODcr content is 3800mg / l, SS content 2600mg / l), filtered through a 60-mesh inclined screen to remove suspended solids particles above 60 mesh, filtered effluent enters the buffer tank, filtered suspended solids are transported out of landfill by truck, and the filtered effluent CODcr content is 1800mg / l~ 4800mg / l, SS content is 1600mg / l~3600mg / l (in this example, CODcr content is 3560mg / l, SS content is 2230mg / l);

[0018] (2) For chemical reaction, the ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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 thelift 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 andequipment, 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 straw pulp wet preparation washing water treatment method. Background technique: [0002] Pulp and papermaking wastewater has become a 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 it is related to the completion of my country's major pollutant emission reduction tasks. At present, a large amount of washing wastewater (chemical oxygen consumption CODcr content of 2000-5000mg / l, suspended solids content of 2000-4000mg / l) is produced in the wet preparation of straw pulp without treatment, but directly sent to the middle section deal with. Due to the limited capacity of middle-stage w...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/52C02F1/24C02F103/28
Inventor 喻益伟刘立新周兵
Owner YUANJIANG PAPER
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products