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Method for biologically denitrifying high-salinity sewage generated in production process of catalysts

A technology for biological denitrification and catalysts, applied in chemical instruments and methods, water pollutants, biological water/sewage treatment, etc., to achieve the effect of strong impact resistance, reducing turbidity and enhancing salt resistance.

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

Aiming at the deficiencies of the prior art, the present invention discloses a biological treatment method for producing salt-containing and ammonia-containing wastewater with a catalyst. The method uses nitrifying bacteria and denitrification microbial agents with similar growth The combination of mud as a microbial carrier reduces the salinity, ammonia nitrogen and a small amount of metal ions in the sewage, solves the problem of salty and ammoniacal wastewater treatment generated in the existing catalyst production process, and enables the treated sewage to meet the discharge standards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1 The preparation of denitrifying bacteria agent

[0028] 1. Inoculate Staphylococcus koesii FSDN-C, Arthrobacter FDN-1 and Flavobacterium waterii FDN-2 of the present invention on beef extract peptone solid medium respectively and activate them in a constant temperature incubator at 30°C, and cultivate The basic formula is: beef extract: 5g / L, peptone: 10g / L, NaNO 2 : 1g / L, add 2.0% agar, and add 0.5mL / L methanol to the solid culture medium of Staphylococcus koesei FSDN-C. The culture condition of the strain is that the temperature is 30-35°C, 150-240rpm shaking culture to the logarithmic phase, and then the bacteria can be harvested for the preparation of microbial inoculum.

[0029] 2. Scrape a solid colony with an inoculation loop and inoculate it in the beef extract peptone liquid culture solution, and culture it under aerobic conditions at a temperature of 25~35°C and 150~240rpm for 1~3 days until the logarithmic growth phase, and obtain liquid bacte...

Embodiment 2

[0033] Salt and high ammonia nitrogen catalyst wastewater from a chemical plant, the wastewater quality is characterized by ammonia nitrogen concentration of 400~600 mg / L, COD concentration of 200~500mg / L, pH8.87, conductivity of 35~40ms / cm, Cu 2+ The concentration is 2~10mg / L, the concentration is Zn 2+ 10~20mg / L. SBR process is used for treatment. At the start of work, the activated sludge of the oil refinery sewage plant is used as the seed sludge. After being put in, the MLSS is 3800mg / L, and the nitrifying bacteria are added after 7 days of suffocation under the condition of DO of 2~5mg / L. For the first time, according to Add MLSS at 600mg / L, and add MLSS again at 200mg / L two days later. After two days of operation, DO is 2~4mg / L, pH value is 7.8, and nitrite nitrogen in the system accounts for 50% of the total nitrification products. %, now add the denitrifying bacteria agent A of embodiment 1. Dosing once every 5 days, for the first time, dosing at a volume ratio of 0...

Embodiment 3

[0035] The existing sewage water quality of a catalyst factory is: ammonia nitrogen concentration 50~300 mg / L, COD concentration 50~500mg / L, pH8.93, conductivity 25~35ms / cm, Cu 2+ The concentration is 5~10mg / L, Zn 2+ The concentration is 15~25mg / L, and it also contains about 400mg / L of nitrate. Due to the influence of high-concentration salt and metal ions such as copper and zinc, the sewage cannot be treated up to the standard. The method of the present invention is used for treatment. When the MLSS in the original system is 4000mg / L, nitrifying bacteria are added, and the MLSS is 600mg / L for the first time. After one week of operation, the concentration of ammonia nitrogen in the effluent is lower than 25mg / L, and the addition can be stopped. nitrifying bacteria. After continuing to run for a week, the nitrification rate is 60%. Now start to add the denitrifying bacteria agent B of Example 1 at a volume ratio of 0.5% of the amount of treated sewage per hour according to th...

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Abstract

The invention discloses a method for biologically denitrifying high-salinity sewage generated in the production process of catalysts. The method is implemented by adding nitrobacteria and denitrifiers with nitrites as electron acceptors to sewage, wherein the high-salinity sewage treatment temperature is 18-40 DEG C; the dissolved oxygen is 0.2-3mg / L; and the pH value is 7.5-8.5. The method adopts autotrophic bacteria and heterotrophic bacteria which are subjected to combination of superiority to serve as reinforced microorganisms for treating sewage, adopts different addition modes, can achieve removal of ammonia nitrogen, total nitrogen and CODcr in the same reactor, has a good wastewater treatment effect, and truly achieves biological denitrification of the high-salinity sewage generated in the production process of catalysts by being combined with high-efficiency devices.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering sewage biological treatment, and in particular relates to a biological denitrification method for high-salt catalyst sewage. Background technique [0002] Ammonium salts and ammonia water are used in many places in the catalyst production process of the petrochemical industry, so the discharged catalyst wastewater contains a large amount of ammonia nitrogen. Although ammonia nitrogen in wastewater can be treated by physical and chemical methods such as stripping, ion exchange, and chemical oxidation, these methods have problems such as secondary pollution by by-products and low treatment efficiency. In contrast, the biological method is a better method to control ammonia nitrogen pollution in water bodies. [0003] As the terminal technology of conventional sewage treatment, the traditional biological method has limited ability to deal with high ammonia nitrogen and low COD wast...

Claims

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Application Information

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IPC IPC(8): C02F3/34C02F101/16
Inventor 高会杰孙丹凤李宝忠
Owner CHINA PETROLEUM & CHEM CORP
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