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

A technology for producing wastewater and catalytic cracking, which is used 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: 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 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 FCC catalyst production process, which is mixed with domestic sewage and treated together, and 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 is 8.2. The SBR process is adopted. The activated sludge from the oil refinery wastewater plant is used as seed sludge at the start of construction. The MLSS is 3600mg / L after being put into use, and the nitrifying bacteria is added after 5 days of smoldering under the condition of 3~5mg / L. MLSS is 400mg / L dosing, two days later, MLSS is 200mg / L dosing again, after two days of operation, DO is 2~4mg / L, pH is 7.9, nitrite nitrogen in the system accounts for 53 of the total nitrification products %, at this time, add denitrifying bacteria agent A1. The denitrifying bacteria agent...

Embodiment 2

[0024] The existing sewage treatment system of a catalyst plant can treat process sewage and domestic sewage during the production of hydrogenation catalysts. A large amount of ammonia-containing wastewater will be generated when the new FCC catalyst is produced, which will impact the existing sewage treatment plant. The effluent ammonia nitrogen concentration is relatively high. High, sewage can not be treated up to the standard. After mixing the process wastewater from the molecular sieve production process in the original sewage treatment system, the wastewater quality is: COD concentration 100~380mg / L, ammonia nitrogen concentration 200~1000mg / L, pH 7~9. Firstly treat the activated sludge in the system. When the MLSS is 4200mg / L, add nitrifying bacteria, and do it according to the MLSS of 600mg / L for the first time. After a week of operation, the ammonia nitrogen concentration in the effluent is below 25mg / L, and the nitrifying bacteria can be stopped . After running for a...

Embodiment 3

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