Denitrification method of wastewater generated in process of producing catalytic cracking catalysts

A technology for producing wastewater and catalytic cracking, which is applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc. It can solve the problems of up-to-standard discharge of ammonia-containing wastewater, reduce toxicity, and promote short-range nitrification. Denitrification process, the effect of highlighting the treatment effect

Active Publication Date: 2014-12-31
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 method for denitrification of ammonia-containing wastewater produced by FCC catalysts. The method uses nitrifying bacteria and denitrification microbial agents with similar growth conditions as the main body of denitrification, and uses sewage plant activated sludge as a microbial carrier to combine denitrification. Nitrogen, to solve the discharge problem of ammonia-containing wastewater produced in the production process of FCC catalysts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A catalyst company produces a large amount of ammonia-containing wastewater during the production of FCC catalysts, which is mixed with domestic sewage and treated together. The wastewater discharge volume is 200m 3 / d. Wastewater quality: the average ammonia nitrogen concentration is 530mg / L, the average COD concentration is 320mg / L, the chloride ion concentration is 4020mg / L, and the pH value is 8.2. SBR process is used for treatment. At the beginning of the operation, the activated sludge of the oil refinery sewage plant is used as the seed sludge. After being put in, the MLSS is 3600mg / L, and the nitrifying bacteria are added after 5 days of suffocation under the condition of DO of 3~5mg / L. For the first time, according to Dosing at 400mg / L MLSS, dosing again at 200mg / L MLSS two days later, after two days of operation, DO is 2~4mg / L, pH value is 7.9, nitrite nitrogen in the system accounts for 53% of the total nitrification products %, add denitrifying bacteria age...

Embodiment 2

[0024] The existing sewage treatment system of a catalyst factory can handle the process sewage and domestic sewage in the production process of hydrogenation catalyst. When the newly added FCC catalyst is produced, a large amount of ammonia-containing wastewater will be generated, which will impact the existing sewage treatment plant. The concentration of ammonia nitrogen in the effluent is relatively high. High, the sewage cannot be treated up to the standard. After the original sewage treatment system mixes the process sewage from the molecular sieve production process, the wastewater quality is: COD concentration 100~380mg / L, ammonia nitrogen concentration 200~1000mg / L, pH 7~9. Firstly, the activated sludge in the system is treated. When the MLSS is 4200mg / L, nitrifying bacteria are added. For the first time, the MLSS is 600mg / L. After one week of operation, the concentration of ammonia nitrogen in the effluent is lower than 25mg / L, and the nitrifying bacteria can be stoppe...

Embodiment 3

[0026] According to the method described in Example 1, using the denitrifying bacteria agent C1, after 10 days of operation, the concentration of ammonia nitrogen in the effluent was lower than 25 mg / L, and the concentration of nitrate nitrogen was lower than 20 mg / L, and the addition of both bacteria was stopped. After one month of continuous operation, the concentrations of ammonia nitrogen and total nitrogen in the effluent were both stable below 15mg / L.

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PUM

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Abstract

The invention discloses a denitrification method of wastewater generated in the process of producing catalytic cracking catalysts. The method comprises the step of adding nitrobacteria and a denitrification agent to sewage, wherein the denitrification agent contains arthrobactercreatinolyticus FDN-1, flavobacteriummizutaii FDN-2, paracoccusdenitrificans DN-3 and methylobacteriumphyllosphaerae SDN-3. The method adopts autotrophic bacteria and heterotrophic bacteria which are subjected to combination of superiority to serve as reinforced microorganisms for wastewater treatment, adopts different addition modes, can achieve removal of ammonia nitrogen, total nitrogen and CODcr in the same reactor, has a good wastewater treatment effect, truly achieves short-cut nitrification and denitrification or simultaneous nitrification and denitrification of ammonia-containing catalyst wastewater by being combined with high-efficiency devices, and achieves up-to-standard discharge of pollutants such as ammonia nitrogen and the like in the wastewater.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering sewage biological treatment, in particular relates to a method for treating ammonia-containing wastewater produced in the catalyst production process, in particular to a method for denitrification of catalytic cracking (FCC) catalyst production wastewater capable of realizing short-range nitrification and denitrification . Background technique [0002] In the production process of catalytic cracking catalysts, ammonia (ammonium) compounds such as ammonium chloride, ammonium sulfate, and liquid ammonia need to be used to change the pH value of the solution or improve the performance of the catalyst, so the waste water from catalyst production contains a large amount of ammonia nitrogen. In consideration of water saving and emission reduction, first adopt the strategy of sewage diversion-separation and treatment. For the ultra-high concentration (2000~20000mg / L) of ammonia nitrogen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30C02F3/34
Inventor 高会杰张鹏孙丹凤李宝忠
Owner CHINA PETROLEUM & CHEM CORP
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