A kind of denitrification method of fcc catalyst production wastewater

A technology for the production of wastewater and catalysts, which is applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of ammonia-containing wastewater discharge and achieve stable nitrification and denitrification, outstanding treatment effect, the effect of stabilizing the denitrification treatment target

Active Publication Date: 2014-10-15
CHINA PETROLEUM & CHEM CORP +1
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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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Effect test

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 denitrification of FCC catalyst wastewater, which comprises the following contents: adding nitrifying bacteria and nitrous acid denitrification bacterial agent to the sewage, the treatment temperature of ammonia nitrogen-containing sewage is 18-40°C, and the dissolved oxygen is 0.2~ 3mg / L, pH 7.5-8.5. The method of the present invention adopts autotrophic bacteria and heterotrophic bacteria to carry out the advantageous combination as the enhanced microorganisms for wastewater treatment, and adopts different feeding methods to realize the removal of ammonia nitrogen, total nitrogen and CODcr in the same reactor, and the wastewater treatment effect is good, compared with The combination of high-efficiency devices can truly realize short-range nitrification and denitrification or synchronous nitrification and denitrification of ammonia-containing wastewater with catalysts, and realize the discharge of ammonia nitrogen and other pollutants in wastewater up to standard.

Description

Technical field [0001] The present invention is a field of environmental engineering sewage biological treatment technology. It specifically involves a method of ammonia -containing wastewater treatment produced by a catalyst production process, especially the nitrogen removal method that can produce wastewater production of FCC catalysts that can achieve short -range nitrification. Background technique [0002] During the production of catalytic cracking catalysts (FCC), ammonia -containing compounds such as ammonium chloride, ammonium sulfate, and liquid ammonia containing ammonia (ammonia, ammonia) are used to change the pH value of the solution or improve the performance of the catalyst.From the comprehensive consideration of water-saving and emission reduction, first adopt the strategy of dirty diversion-division, for ammonia nitrogen in the high concentration of the wastewater (2000 ~ 20000 mg / L), the ammonia recycling method can be used. / L This section of wastewater can be...

Claims

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Application Information

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