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A kind of treatment method of the waste water produced in the production process of acrylic fiber

A treatment method and production process technology are applied in the field of treatment of wastewater generated in the production process of acrylic fibers, which can solve the problems that nitrogen-containing pollutants cannot be treated up to standard and are difficult to degrade, and achieve the effects of reducing impact, removing efficiently and realizing toxicity.

Active Publication Date: 2019-01-25
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The invention solves the problem that the cyanide-containing wastewater is difficult to degrade and the nitrogen-containing pollutants in the wastewater cannot be treated up to the standard, and realizes simultaneous and efficient removal of COD and nitrogen-containing pollutants

Method used

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  • A kind of treatment method of the waste water produced in the production process of acrylic fiber

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Embodiment 1

[0016] The preparation of embodiment 1 microbial bacterial agent

[0017] 1. Cultivation of a single bacterial strain: FDN-1, FDN-2, DN-3, SDN according to the methods described in CN2010106224.6, CN2010106240.5, CN2010106203.4, CN201010536169.0, CN201110353731.0 and CN201110353742.9 respectively -3. The six bacterial strains FSDN-A and FSDN-C were cultured to the logarithmic phase, and the seed liquid of a single bacterial strain was obtained.

[0018]2. Preparation of microbial inoculum: if the inoculum added to the anaerobic hydrolysis unit contains Paracoccus denitrificans DN-3 and / or Methylobacterium SDN-3, follow the method described in Example 1 of CN201210130644.3 or CN201210130645.8 The bacterial agent is prepared, wherein the culture conditions are temperature 25-35° C., pH value 6.5-10.0, and DO lower than 0.5 mg / L. If there are four kinds of bacteria at the same time, the four kinds of bacteria of Paracoccus denitrifica DN-3, Methylobacterium SDN-3, Corkia palustr...

Embodiment 2

[0025] The COD concentration in the wastewater produced by an acrylic fiber production plant is about 1200mg / L, the BOD concentration is about 150mg / L, and the total nitrogen concentration is about 100mg / L. CN - The concentration is about 5.2mg / L, NH 3 -The concentration of N is about 60mg / L, the pH value is 8.8, and the combined process of anaerobic hydrolysis-aerobic contact oxidation-biological denitrification is used for treatment. The wastewater first enters the anaerobic hydrolysis unit, the residence time is 6 hours, the pH is controlled at 6.0, and the temperature is 30°C. After anaerobic treatment, the wastewater is transported to the aerobic contact oxidation unit, the residence time is 10 hours, and the pH is controlled at 7.5~7.8. DO: 3.2~3.5mg / L, temperature 30°C, the wastewater treated by the aerobic contact oxidation unit enters the biological denitrification unit for denitrification and further removal of COD, the residence time is 8 hours, and the pH is contro...

Embodiment 3

[0027] The COD concentration in the wastewater produced by a dry acrylic fiber production plant is about 1800mg / L, the BOD concentration is about 250mg / L, and the TN concentration is about 260mg / L. CN - The concentration is about 7.4mg / L, NH 3 -The concentration of N is about 160mg / L, the pH value is 7.8, and it is treated by the combined process of anaerobic hydrolysis-aerobic contact oxidation-biological denitrification. The wastewater first enters the anaerobic hydrolysis unit, the residence time is 8 hours, the pH is controlled at 6.5, and the temperature is 30°C. After anaerobic treatment, the wastewater is sent to the aerobic contact oxidation unit, the residence time is 10 hours, and the pH is controlled at 7.5~8.0, DO: 3.5~4.0mg / L, temperature 30℃, the wastewater treated by the aerobic contact oxidation unit enters the biological denitrification unit for denitrification and further removal of COD, the residence time is 12 hours, the pH is controlled at 8.0~8.5, DO: 2.0...

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Abstract

The invention discloses a processing method of waste water generated in polyacrylonitrile production process. According to the processing method, polyacrylonitrile waste water is delivered through an anaerobic hydrolysis unit, an aerobic contact oxidation unit, and a biological denitrification unit successively; a heterotrophic nitrification-aerobic denitrification bacteria agent is added into the anaerobic hydrolysis unit; a denitrification bacteria agent is added into the biological contact oxidation unit; the heterotrophic nitrification-aerobic denitrification bacteria agent mainly comprises one or two selected from Paracoccus denitrificans DN-3, and Methylobacterium phyllosphaerae SDN-3; the denitrification bacteria agent comprises Arthrobacter creatinolyticus FDN-1, Flavobacterium mizutaii FDN-2, Paracoccus denitrificans DN-3, Methylobacterium phyllosphaerae SDN-3, Kocuria palustris FSDN-A, and Staphylococcus cohnii FSDN-C. The processing method is capable of solving problems that cyanide-containing waste water is difficult to degrade, and up-to-standard processing of nitrogen pollutants in waste water is impossible to realize, and realizing simultaneous high efficiency removing of COD and nitrogen pollutants.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering wastewater biological treatment, and in particular relates to a treatment method for wastewater generated in the production process of acrylic fibers. Background technique [0002] A large number of highly toxic nitrogen-containing organic substances contained in the wastewater discharged from the acrylic fiber production process are gradually decomposed by various bacteria, and then the toxicity is degraded. At the same time, a new ammonia nitrogen treatment problem has emerged. At present, the wastewater produced by the dry-process acrylic fiber production unit is mainly treated by the anaerobic-aerobic-biological activated carbon process. In the initial design of the sewage treatment plant of the dry acrylic fiber factory, the issue of ammonia nitrogen was not considered comprehensively, and the designed return flow was small, which could not guarantee the normal progress of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F3/30C02F3/28C02F3/34C02F103/38
Inventor 高会杰郭志华孙丹凤郭宏山
Owner CHINA PETROLEUM & CHEM CORP
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