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Paper-making effluent purifying treatment process

A technology of pulping and papermaking and purification treatment, which is applied in the direction of processing wastewater treatment, anaerobic digestion treatment, chemical instruments and methods, etc., can solve the problems of high operating cost, poor biodegradability and ineffectiveness of remaining black liquor, etc. Achieve the effects of reduced energy demand, stable operation, and floor space savings

Inactive Publication Date: 2007-03-21
山东贵和显星纸业有限公司
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Problems solved by technology

[0004] (2) The chemical method mainly uses the oxidation-reduction properties of electrochemical or chemical agents to oxidize the organic matter in the water. The chemical method has a good treatment effect and a fast rate, but the operating cost is too high for high-concentration residual black liquor, so it is difficult to apply in practice.
[0006] The main pollutants in papermaking wastewater are macromolecular organic substances that are difficult to degrade, such as cellulose, hemicellulose, lignin, and polypentose, which have poor biodegradability, and aerobic biological treatment technology alone often fails to achieve satisfactory results.

Method used

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  • Paper-making effluent purifying treatment process

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Embodiment Construction

[0027] The present invention is illustrated below in conjunction with accompanying drawing.

[0028]The mixed wastewater from pulping and papermaking passes through the grid to remove large pieces of mechanical impurities, collects the pulp and recovers fine fibers through the inclined screen with an aperture of 90 mesh, and then enters the air flotation device, passes through the flocculant (polyaluminum chloride with a mass concentration of 10% or It is treated with 0.1% polyacrylamide) to remove tiny suspended matter, and then enters the sedimentation tank, and adjusts the water quality to PH=6~9 through water volume, and COD4 and CO 2 , so that the water quality is purified, the operating condition is that the volume load is 3.0-5.0kgCOD / (m 3 .d), using normal temperature anaerobic digestion, the total residence time is 24-30h, and the average sludge concentration (MLVSS) is 30-40g / L. The effluent from the anaerobic reactor enters the anoxic tank, and the dissolved oxygen...

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Abstract

The present invention is paper-making effluent purifying treatment process including hydrolyzing acidification, anaerobic biological treatment, anoxia treatment, aerobic biological treatment and aerobic biofilter treatment mainly. The present invention has low treating cost, low power consumption, capacity of generating energy source with produced methane, high treating efficiency, high COD and SS eliminating rate, and other advantages.

Description

technical field [0001] The invention belongs to a method for purifying wastewater from pulping and papermaking, and relates to the technical fields of environmental engineering, water pollution control and water saving. Background technique [0002] The main treatment methods of papermaking wastewater include: physical and chemical methods, chemical methods, and biochemical methods. [0003] (1) The physical and chemical method mainly uses the physical properties of wastewater such as grids, sedimentation, etc., or uses the physical and chemical properties of wastewater such as coagulation and sedimentation. This method has a good treatment effect on suspended solids and some colloidal substances. Physicochemical methods are difficult to remove, but physical and chemical methods can be used as pretreatment or biochemical post-treatment of paper pulping wastewater. [0004] (2) The chemical method mainly uses the oxidation-reduction properties of electrochemical or chemical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/66C02F3/28C02F3/02C02F1/52C02F103/28
CPCY02E50/343Y02E50/30Y02W10/10
Inventor 徐书栋
Owner 山东贵和显星纸业有限公司
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