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Treatment methods of papermaking wastewater

A treatment method and papermaking wastewater technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem that the effluent is difficult to meet the discharge standards, and achieve high treatment control standards, The effect of high efficiency and low cost

Inactive Publication Date: 2011-11-30
GUANGZHOU CHINAEVER ENVIRONMENTAL ENG
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Problems solved by technology

[0003] At present, the traditional "physicochemical + biochemical" treatment process is mainly used at home and abroad to treat papermaking wastewater, but the effluent is difficult to meet the increasingly stringent discharge standards

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Embodiment Construction

[0027] In order to make the present invention easier to understand, specific embodiments of the present invention will be further described below.

[0028] A combined treatment method for high-standard discharge of papermaking wastewater, for treating papermaking wastewater, the method includes the following steps:

[0029] (1) After pretreatment, the papermaking wastewater is subjected to physical and chemical treatment, and after the mud-water separation in the primary sedimentation tank, it flows to the regulating tank by itself;

[0030] (2) The wastewater from the adjustment tank is lifted to the PAFR reactor for hydrolysis and acidification reaction. After hydrolysis and acidification, the effluent flows into the improved oxidation ditch system by itself, and the effluent from the oxidation ditch enters the secondary sedimentation tank for mud-water separation, and the effluent flows to the sump by itself;

[0031] (3) The wastewater from the sump tank is elevated and th...

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PUM

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Abstract

The invention discloses a combined treatment method for high-standard discharge of papermaking wastewater, which solves the difficult problem of papermaking wastewater. The technical solution includes the following steps: physical and chemical treatment of papermaking wastewater after deslagging, separation of sludge and water, and promotion to PAFR reactor for hydrolysis and acidification reaction, after hydrolysis and acidification, the effluent flows into the improved oxidation ditch system, and after separation of cement and water from the oxidation ditch, it is promoted to high-grade The oxidation system flows into the final sedimentation tank after coagulation reaction after dosing, and the supernatant is discharged up to the standard. The method can make the effluent CODCr≤70mg / L after the papermaking wastewater is treated, basically reaching the higher industrial wastewater treatment control standard.

Description

technical field [0001] The invention relates to a treatment method for high-standard discharge of industrial wastewater, in particular to a treatment method for high-standard discharge of papermaking wastewater. Background technique [0002] Papermaking wastewater, especially pulping and papermaking wastewater, mainly comes from the leaching process of raw wood chips (or wheat straw, etc.), the mid-stage water of chemical-mechanical pulp, and the production process of containerboard paper. Wastewater is characterized by a large amount of water, SS, COD Cr Both are high, the wastewater B / C is low, and the biodegradability is poor, which is one of the more difficult industrial wastewater to treat. The pollutant composition of wastewater is complex, containing a large number of macromolecular pollutants with relatively stable molecular structure, such as lignin, cellulose, hemicellulose and a small amount of rosin and other refractory pollutants, and some other organic impurit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 刘德沛
Owner GUANGZHOU CHINAEVER ENVIRONMENTAL ENG
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