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Closed control method of paper-making waste water

A papermaking wastewater, closed technology, applied in papermaking, textile and papermaking, chemical instruments and methods, etc., can solve the problems of high operating costs, difficult to popularize, and high energy consumption, so as to achieve low operating costs and reduce investment. , the effect of thorough governance

Inactive Publication Date: 2008-09-17
尤俊洪
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires a lot of investment and energy consumption, so it is difficult to popularize
The commonly used physical and chemical methods are also unbearable for the factory due to high operating costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0018] A 10,000-ton paper mill has waste water from soda straw pulp. 200 tons of black liquor per day, COD about 100,000; 6,000 tons of middle water, 1,500 to 2,000 COD; 5,000 tons of white water, 350 to 500 COD.

[0019] The treatment method of closed papermaking wastewater includes the treatment method of black liquor, middle water and white water, wherein, the treatment method of black liquor includes the preparation of bacterial solution and the biochemical treatment of black liquor, and the use under alkaline conditions Lignin is separated, then filtered, and the filtrate is returned for cooking; the treatment method of the middle water is to carry out condensation and air flotation on the middle water, and the scum is reused as a regeneration agent, and the water phase is reused after being filtered and sterilized ; The treatment method of the white water is to reuse the white water after filtration and purification.

[0020] Wherein, the preparation of the bacterial so...

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PUM

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Abstract

The present invention relates to a closed paper-making waste water treatment method, including black liquor treatment, middle section water treatment and white water treatment, in which the black liquor treatment method includes preparation of disinfection solution and biochemical treatment of the black liquor, lignin segregation under the alkaline condition, filtering and back return of filtrate for steam-cooking, the middle section water treatment method includes flocculation and air-floatation, its dross can be reused as regeneration chemicals, and its water phase is filtered, disinfected and can be reused, and the white water treatment method includes filtration and purification, then purified water can be reused. Said invention possesses the advantages of complete treatment, greatly reduced investment, low cost and repeated utilization of treatment chemicals.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a treatment method for closed papermaking wastewater. Background technique [0002] Papermaking wastewater, including black liquor, mid-stage water, and white water, contains a large number of plant raw material derivatives such as lignin, carbohydrates, and chemical agents such as alkali, which enter the environment and cause huge pollution. In addition to the impact on animals and plants, it also makes it difficult for the surrounding residents to drink water, and the consequences are very serious. At present, some manufacturers adopt the so-called alkali recovery method, that is, the black liquor is evaporated and concentrated, calcined into sodium carbonate, and then causticized to recover the alkali. This method has large investment and high energy consumption, so it is difficult to popularize widely. The commonly used physicochemical method is also unbearable for t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C11/00C02F3/00C02F1/52C02F1/04C02F1/24
Inventor 尤俊洪
Owner 尤俊洪