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A method for denitrification of wastewater discharged from the production process of hydroxyethyl cellulose

A technology of hydroxyethyl cellulose, production process, applied in the field of biological treatment of sewage treatment in environmental engineering

Active Publication Date: 2022-01-11
博瑞德环境集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the existing biological denitrification technology, the present invention discloses a denitrification method for discharging nitrogen-containing wastewater in the production process of hydroxyethyl cellulose. The method of adding nitrogen-removing microorganisms can simultaneously remove ammonia nitrogen and nitrate in wastewater. Nitrogen and nitrite nitrogen, to solve the discharge problem of total nitrogen and COD in hydroxyethyl cellulose production wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The nitrogen-removing bacteria agent used in the present invention can be obtained by using a suitable medium to amplify the corresponding strains and mix them, or use a suitable medium to amplify the cultures after mixing the strains, which is well known to those skilled in the art. , such as LB medium, its components can be tryptone 10g / L, yeast powder 5g / L, NaCl 5g / L, pH7.2.

[0032] The denitrification bacteria agent includes Aeromonas ( Aeromonas sp. ) PR-DN1, Alcaligenes ( Alcaligenes sp. ) PR-DN2, Acinetobacter ( Acinetobacter sp. ) PR-DN3, Bacillus cereus ( Bacillus cereus. ) PR-DN4, microbacteria ( Exiguobacterium sp. ) PR-DN5; 9 cfu / g-4×10 9 cfu / g.

[0033] The preparation method of the denitrification bacteria agent is as follows: inoculate the bacteria involved in the treatment of hydroxyethyl cellulose production wastewater into LB medium (the volume of the bacteria is 2-5% of the volume of the LB medium), and inoculate them at 30 Under the con...

Embodiment 2

[0035] Composition of microbial denitrification bacteria:

[0036] Aeromonas ( Aeromonas sp. ) PR-DN1: 5×10 8 cfu / mL

[0037] Alcaligenes ( Alcaligenes sp. ) PR-DN2: 2.5×10 8 cfu / mL

[0038] Acinetobacter ( Acinetobacter sp. ) PR-DN3: 2.5×10 8 cfu / mL

[0039] Bacillus cereus ( Bacillus cereus. ) PR-DN4: 5×10 8 cfu / mL

[0040] microbacteria ( Exiguobacterium sp. ) PR-DN5: 2.5×10 8 cfu / mL

[0041] Total number of live bacteria: 1.75×10 9 cfu / mL

[0042] The denitrification bacterial agent was prepared according to the method of Example 1. Nitrogen-containing wastewater from a certain hydroxyethyl cellulose production is treated by A / O process. NH in wastewater 3 -N concentration is 20mg / L, NO 3 - -N concentration is 390mg / L, NO 2 - -N concentration is 5mg / L, COD Cr The concentration is 1000 mg / L. The treated wastewater cannot be discharged up to the standard. Add the denitrification bacteria agent prepared by the method of Example 1 into the sewage tr...

Embodiment 4

[0053] Composition of microbial denitrification bacteria:

[0054] Aeromonas ( Aeromonas sp. ) PR-DN1: 9×10 8 cfu / mL

[0055] Alcaligenes ( Alcaligenes sp. ) PR-DN2: 4×10 8 cfu / mL

[0056] Acinetobacter ( Acinetobacter sp. ) PR-DN3: 4×10 8 cfu / mL

[0057] Bacillus cereus ( Bacillus cereus. ) PR-DN4: 5×10 8 cfu / mL

[0058] microbacteria ( Exiguobacterium sp. ) PR-DN5: 3×10 8 cfu / mL

[0059] Total number of live bacteria: 2.5×10 9 cfu / mL

[0060] The method of Example 1 was used to prepare the denitrification bacteria agent. NH in Nitrogenous Wastewater from Certain Hydroxyethyl Cellulose Production 3 -N concentration is 11mg / L, NO 3 - -N concentration is 600mg / L, NO 2 - -N concentration is 12mg / L, COD Cr The concentration is 1500 mg / L. The treated wastewater cannot be discharged up to the standard. Add the denitrification bacteria agent prepared by the method of Example 1 into the sewage treatment system. During the dosing process, the temperature in...

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PUM

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Abstract

The invention relates to a method for denitrification of wastewater discharged from the production process of hydroxyethyl cellulose. The specific steps are: adding a denitrification bacterial agent to a biochemical treatment system for wastewater discharged from the production process of hydroxyethyl cellulose, and starting biological denitrification treatment, The wastewater treatment temperature is 25-40°C, and the dissolved oxygen is 0.2-7mg / L; the present invention adopts denitrification bacteria for superior combination, compounded into a high-efficiency denitrification bacterial agent, and can realize ammonia nitrogen and nitrite nitrogen in the same reactor , Nitrate nitrogen and COD removal, the total nitrogen removal rate can reach 99%, and the wastewater treatment effect is good.

Description

technical field [0001] The invention relates to a denitrification method for wastewater discharged from a hydroxyethyl cellulose production process, and belongs to the technical field of environmental engineering sewage treatment biological treatment. Background technique [0002] The wastewater discharged from the production process of hydroxyethyl cellulose has the characteristics of complex pollutant components, high concentration of wastewater, and the presence of biodegradable substances. Wastewater contains a large amount of toxic nitrogenous substances, especially nitrate nitrogen. At present, the methods of hydroxyethyl cellulose chemical wastewater mainly include: anaerobic + anoxic + aerobic, SBR process, etc. The biotoxic substances contained in hydroxyethyl cellulose production wastewater have a strong inhibitory effect on the life activities of microorganisms in the biochemical system. The large amount of nitrate nitrogen contained in the wastewater needs to pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12N1/20C12N1/02C02F3/34C12R1/01C12R1/05C12R1/085C02F103/36
CPCC12N1/20C12N1/02C02F3/34C02F2103/36
Inventor 李丽严月根吴华明张许阳郭慧李婷
Owner 博瑞德环境集团股份有限公司