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Biological denitrification method for salt-containing sewage

A biological denitrification and sewage technology, applied in water pollutants, chemical instruments and methods, biological water/sewage treatment, etc. high biological activity

Active Publication Date: 2013-10-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention discloses a biological denitrification method for saline sewage, which solves the problem of up-to-standard discharge of ammonia nitrogen pollutants in saline sewage by adding denitrification microorganisms with similar growth conditions and synchronous nitrification and denitrification process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation method of embodiment 1 microbial bacterial agent

[0028] 1. Bacterial activation: The medium formula used for bacterial activation and seed liquid cultivation of Staphylococcus kosheri FSDN-C is: beef extract: 6g / L, peptone: 8g / L, NaNO 2 : 0.6g / L, methanol: 0.5mL / L; the activation medium formula of Arthrobacter FDN-1 and Flavobacterium waterii FDN-2 is: beef extract: 5g / L, peptone: 10g / L, NaNO 2 : 1g / L, add 2.0% agar; the activation medium formula of denitrification paracoccus DN-3 is: KNO 3 : 1g / L, sodium succinate: 8g / L, KH 2 PO 4 :1g / L, FeCL 2 : 0.5g / L, add 2.0% agar; the activation medium formula of Methylobacterium SDN-3 is: ammonium sulfate: 0.5g / L, methanol: 0.75mL / L, KH 2 PO 4 :1g / L, FeCL 2 :0.5g / L; add 2% agar. After spreading evenly on the plate, place it in a constant temperature incubator at a temperature of 30°C for activation.

[0029] 2. Use the inoculation loop to scrape the bacteria on the plate and inoculate them in the corre...

Embodiment 2

[0033] The water quality characteristics of saline wastewater from a chemical plant are: ammonia nitrogen 60~100 mg / L, COD (Cr method, the same below) 300~1000mg / L, BOD concentration 200~700, salt content 2~5%, pH8 .5.

[0034] During the long-term operation of the system, the temperature is about 25°C, the dissolved oxygen is 0.1~4.5mg / L, and the pH is 7.8~8.2. Due to the influence of salt, the removal effect of ammonia nitrogen in the system is poor, the total nitrogen concentration after treatment is as high as 150mg / L, and the SVI of activated sludge is greater than 200 mL / g. The method of the present invention is used to add bacterial agent to the sewage treatment system. For the first time, 1.5% of the amount of sewage treated is added to the sewage treatment system. The amount of bacteria decreased by 30%. After 5 times of dosing, the system ran for a week, and the analysis detected that the concentrations of ammonia nitrogen and nitrate nitrogen were lower than those...

Embodiment 3

[0036] The water quality characteristics of saline wastewater from a chemical plant are: ammonia nitrogen 100~300 mg / L, COD (Cr method, the same below) 500~600mg / L, BOD concentration 200~300, salt content 1~2%, pH7 .8.

[0037] During the long-term operation of the system, the temperature is about 28°C, the dissolved oxygen is 1.0~5.5mg / L, and the pH is 8.0~8.2. During the long-term operation of the system, the removal rate of ammonia nitrogen is only 50%. Adopt the method of the present invention, add bacterial agent C in sewage treatment system according to 5% of treated sewage volume for the first time, add once every five days thereafter, the bacterium quantity of adding last time reduces 40% every time. After 6 times of dosing, the system ran for a week, and the analysis showed that the removal rate of water and ammonia nitrogen reached 85%, and the dosing of both bacteria was stopped. In the case of no sludge discharge within three months, the removal rate of ammonia n...

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Abstract

The invention relates to a biological denitrification method for salt-containing sewage, which comprises the following steps: adding a denitrification microbial inoculant into a biochemical sewage treatment system, and simultaneously starting the nitrification-denitrification biological denitrification treatment processes, wherein the sewage treatment temperature is 18-40 DEG C, the dissolved oxygen is 0.1-5 mg / L, and the pH value is 7.0-9.0. The denitrification microbial inoculant contains one or two of Staphylococcuscohnii FSDN-C, Arthrobactercreatinolyticus FDN-1 and Flavobacteriummizutaii FDN-2, and also contains one or two of Paracoccusdenitrificans DN-3 and Methylobacteriumphyllosphaerae SDN-3. The method provided by the invention can effectively treat high-salt-content sewage, enhances the adsorptivity and flocculence for sludge, has wide application range for wastewater quality and high impact resistance to salt-containing sewage, and obviously enhances the sewage treatment effect on the premise of removing pollutants, such as ammonia nitrogen, COD (chemical oxygen demand) and the like.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to a biological treatment method for salty sewage. In particular, it relates to a special microbial bacterial agent to complete the removal of ammonia nitrogen, total nitrogen and CODcr, so as to realize the industrialization and commercialization of the microbial bacterial agent for saline wastewater treatment. Background technique [0002] In recent years, with the development of industry and agriculture, the discharge restrictions on industrial wastewater, landfill percolation water and urban sewage have become more and more stringent, and more and more attention has been paid to sewage treatment technology, especially the up-to-standard discharge of ammonia-containing wastewater has become an environmental protection field processing problems. Although ammonia nitrogen in wastewater can be treated by physical and chemical methods such as stripping, ion exchange, and ch...

Claims

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Application Information

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IPC IPC(8): C02F3/30C02F3/34C02F101/16
Inventor 高会杰孙丹凤张鹏许谦
Owner CHINA PETROLEUM & CHEM CORP
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