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Method for denitrifying wastewater generated in process of producing FCC (fluid catalytic cracking) catalyst

A technology for producing wastewater and catalysts, which is applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc. Strong impact ability, outstanding processing effect

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

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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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Embodiment 1

[0021] 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 agen...

Embodiment 2

[0023] 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...

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Abstract

The invention discloses a method for denitrifying wastewater generated in the process of producing an FCC (fluid catalytic cracking) catalyst. The method comprises the step of adding nitrobacteria and nitrous acid denitrifiers to sewage, wherein the ammonia nitrogen containing 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 wastewater, 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 the ammonia-containing wastewater generated by producing the catalyst 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 wastewater biological treatment, in particular to a method for treating ammonia-containing wastewater produced in a catalyst production process, in particular to a method for denitrification of FCC catalyst production wastewater capable of realizing short-range nitrification and denitrification. Background technique [0002] In the production process of catalytic cracking catalyst (FCC), 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 wastewater discharged from catalyst production contains a large amount of ammonia nitrogen. In terms of water saving and emission reduction, the strategy of diversion and treatment of sewage is firstly adopted. For the ultra-high concentration (2000~20000mg / L) of ammonia nitrogen in wastewater, the amm...

Claims

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Application Information

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IPC IPC(8): C02F3/30C02F3/34
Inventor 高会杰张鹏李宝忠
Owner CHINA PETROLEUM & CHEM CORP
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