Method for recovering, treating and closed-loop circulating waste water of papermaking

A closed-circuit circulation technology for papermaking wastewater, applied in water/sewage treatment, water/sludge/sewage treatment, papermaking, etc., can solve problems such as inability to promote, and achieve high recycling profits, simple operation and management, and less land occupation Effect

Inactive Publication Date: 2003-06-04
王振声
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  • Abstract
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  • Claims
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Problems solved by technology

Township enterprises still cannot bear the burden, so that they cannot promote

Method used

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  • Method for recovering, treating and closed-loop circulating waste water of papermaking
  • Method for recovering, treating and closed-loop circulating waste water of papermaking
  • Method for recovering, treating and closed-loop circulating waste water of papermaking

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Embodiment Construction

[0036] Combine below Figure 7-Figure 9 Further describe the process of the present invention.

[0037] Papermaking black liquor, recovery of alkali, pulp, fuel and waste water recycling, such as Figure 7 shown, including;

[0038] [71] is the black liquor storage tank, and the uneven water quality and water quantity are homogenized in the regulating tank [72], and the hemifiber and lignin in the black liquor are recycled to [77] by the screen filter [73]. Pulp storage tank, used as papermaking raw material. After the effluent of the screen filter is filtered by the filter device [74], all impurities in the black liquor are intercepted and adsorbed by the filter material in the filter device, and the filter material and the trapped and adsorbed impurities are sent to the boiler [78] for combustion or storage. The used filter material is cheap, with large specific surface area and good chemical stability, such as slag, lignite, coke and other materials, and the particle siz...

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Abstract

A closed cycle process for recovering and treating of waste water in paper-making features that all of the useful substances are physically and chemically recovered and fully used and the treated water takes part in closed cycle for reuse. Its advantages include less investment and operating cost and high return on investment. As compared with conventional chemical recovery process. Said process is only 1/8-1/15 of investment, 1/10-1/20 of operating cost, 1/10-1/15 of return years on investment.

Description

technical field [0001] The invention belongs to the field of waste water treatment in environmental engineering, and is suitable for waste water treatment of various papermaking raw materials and papermaking methods, and is especially suitable for waste water treatment of small paper mills. The invention solves the problem of recycling all substances in the papermaking wastewater and makes full use of them, the alkali recovery reaches almost 100%, the wastewater is closed-circuited, no pollutants are discharged, and there is no pollution to the environment. The economic benefits, social benefits and environmental benefits are very significant. Background technique [0002] China's paper output ranks fourth in the world, and its per capita share is only 1 / 4 of the world's per capita output, which is 1 / 20 of that of developed countries. Since the end of the 1970s, in order to alleviate the trend of national paper supply shortage and solve the employment problem of rural surpl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D29/075C02F1/00C02F1/52D21C11/00
Inventor 王振声
Owner 王振声
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