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Carbonate type ammoxidation process and strengthening technology thereof

A carbonate type, ammonia oxidation technology, applied in anaerobic digestion treatment, chemical instruments and methods, biological water/sewage treatment, etc. It can improve the rate of anaerobic nitrification, reduce investment and operating costs, and achieve good environmental conditions.

Active Publication Date: 2021-08-06
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, anammox bacteria are chemoautotrophic microorganisms with low production capacity, long generation time (about 11 days), and slow reactor start-up process.
In addition, most of the nitrogen in municipal sewage or industrial wastewater is NH 4 + -N and NO 3 - -N is dominant, and it is difficult to maintain a high content of NO in the anammox system 2 - -N
Therefore, the large-scale engineering application of ANAMMOX is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The use of active sludge method (SBR process) to treat urban life sewage, water ammonia nitrogen concentration is 70 ~ 80mg / L, add NA 2 CO 3 The solution is 550 to 600 mg / L, i.e., the carbon nitrogen ratio is 0.9-1.1: 1; the system is full of anaerobic operation, not aerated, pH 6.3 ~ 8.4, the water temperature is 17 ~ 21 ° C; the hydraulic residence time is controlled at 8h, Sludge age 28d. During the 76D stable operation, the water ammonia nitrogen concentration is between 1.4 to 9.6 mg / L, the removal rate is 86% ~ 99%, the nitrogen is mainly based on nitrate nitrogen (accounting for 56% to 82%), and nitrate. Nitrogen accounts for 18% to 44%. According to the water carbon nitrogen ratio (1: 1), after investing an oxidized mediator-ribuminin (30 mg / L), the ammonia nitrification rate increased by 34% to 65%, and the removal rate is stable in more than 96%. The nitrogen in the product is mainly nitrate nitrogen (69% to 88%), and the nitrogen nitrogen is 12% to 31%.

...

Embodiment 2

[0039] The UASB process is used to treat high-amamine garbage filtration, and the water ammonia nitrogen concentration is 670 ~ 1000mg / L, and the carbon dioxide is pressurized to supplement the carbonate (CO). 3 2- ), In the system 3 2- The concentration of 1300 ~ 5600 mg / L, i.e., carbon nitrogen ratio of 2.0 ~ 3.0: 1; pH value of water in water is 7.3 to 8.2, and the operation water temperature is 17 ~ 32 ° C; the hydraulic residence time is controlled at 25h, the sludge age is 100d. During the 150D stable operation, the aqueous ammonia nitrogen concentration is between 36 and 105 mg / L, the removal rate is 82% to 94%, and the nitrogen in the product is mainly based on nitrate nitrogen (52% ~ 68%), nitrate. Nitrogen accounts for 32% to 48%. According to the water-based carbon nitrogen ratio (2.0 ~ 3.0), the system is added to the oxidation of the oxidative mediator-refers to the ammonia nitrification rate by 34% to 65%, and the removal rate is stable in more than 96%. The ...

Embodiment 3

[0042] The food industry sewage was treated with a biological membrane method (mushing anaerobic biofilter), and the inlet ammonia nitrogen concentration was 350 to 400 mg / L, and filling mass ratio of 10% in ceracera filter material. 3 Solid, adjusting the pH of wastewater at 6.5 to 7.5; hydraulic residence time is controlled at 48h, and the biofilm is naturally falling off. Caco 3 The solid is slowly released into the inlet, and after domestication, during the stable operation of 105 days, the water temperature fluctuates between 10 and 18 ° C, and the system is CO 3 2- The concentration was 1420 to 1680 mg / L, i.e., the carbon nitrogen ratio of 1.1 to 1.5: 1. The aqueous ammonia nitrogen concentration is between 21.3 to 47.6 mg / L, the removal rate is 88.1% ~ 94%, the nitrogen in the product is mainly nitrate nitrogen (accounting for more than 76%, up to 100%), and the ratio of nitrous nitrogen state It is less than 24%. The nitrification rate has increased by more than 20%...

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Abstract

The invention discloses a carbonate type ammoxidation process and a strengthening technology thereof. According to the method, a proper amount of carbonic acid compounds are supplemented into the wastewater to serve as an electron acceptor for ammonia nitrogen autotrophic oxidation and a carbon source for nitrifying bacteria anabolism; nitration of ammonia nitrogen under an anaerobic condition is realized by regulating and controlling environmental factors such as proper temperature and pH value and working conditions such as hydraulic retention time and sludge retention time, and nitrite nitrogen and nitrate nitrogen are stably generated from the ammonia nitrogen; and by supplementing a proper amount of redox mediator in the system, the ammonia nitrogen nitration / oxidation rate can be increased, the nitration degree is more thorough, and the product is mainly nitrate nitrogen. Aeration oxygen supply is not needed in the whole process, and the construction and operation cost of a rear-mounted biological denitrification process based on the nitrification-denitrification process can be greatly reduced.

Description

Technical field [0001] The present invention belongs to the field of environmental protection sewage biological denitride, involving a carbonate type ammonia oxidation process and its strengthening techniques, and is specifically related to a ammonia nitrogen anaeroxidation treatment method using a carbonate as an electron acceptor and electronics. Medomanner strengthening process. Background technique [0002] During the process of wastewater biodeproform, the nitrification process of ammonia nitrogen is critical, and it is to ensure traditional A / O process, A 2 Biological Nitrogen and Phosphorus Process, Short Round Nitrification - Nitrination Process, Nitrification - Basis of Nitrification - Internal Denitrification Detproduction Process. However, the nitrification process needs to maintain a high DO level (NH 4 + -N's oxygen equivalent is 4.57 g O 2 / g NH 4 + -N), the aeration energy is very high, and the sewage plant is difficult to operate. [0003] Does the key regula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28C02F101/16
CPCC02F3/28C02F3/2846C02F3/282C02F3/2826C02F2209/02C02F2209/06C02F2101/16Y02W10/10
Inventor 黄进刚施彬芳刘静雅韩伟唐俊红
Owner HANGZHOU DIANZI UNIV
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