Recovering method of synchronous nitrosation-anaerobic ammonia oxidation and denitrification process

A technology for nitrifying anaerobic ammonia and anaerobic ammonia oxidation, which is applied in aerobic and anaerobic process treatment, chemical instruments and methods, water/sludge/sewage treatment, etc. crashes, etc.

Active Publication Date: 2015-07-22
BEIJING UNIV OF TECH
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  • Abstract
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Problems solved by technology

[0007] However, in the application process, the SNAD process often results in a large number of nitrite oxidizing bacteria (NOB) in the system due to improper operation, equipment failure and other reasons, resulting in...

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  • Recovering method of synchronous nitrosation-anaerobic ammonia oxidation and denitrification process
  • Recovering method of synchronous nitrosation-anaerobic ammonia oxidation and denitrification process
  • Recovering method of synchronous nitrosation-anaerobic ammonia oxidation and denitrification process

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Embodiment

[0017] This experiment adopts SBR reactor, which is made of plexiglass, and a circulating water bath system is installed outside to maintain the temperature in the reactor (28-32°C). The inner diameter of the reactor is 9cm, the height is 1000cm, the effective volume is 5.4L, The exchange ratio is 50%, the bottom is equipped with an aeration head, and the dissolved oxygen is regulated and controlled through a rotameter and an online dissolved oxygen analyzer. The reactor is equipped with a simple automatic control device to realize the continuous automatic operation of water intake, reaction, precipitation, drainage, idle and other stages. The experiment is based on the septic output of a community: NH 4 + -N=90±5mg / L, COD=160±25mg / L, pH=7.3±0.1, alkalinity=370±50gCaCO 3 . Runs 2 cycles per day. Determination of NH in influent and effluent water respectively every cycle 4 + -N, NO 2 — N. NO 3 — N content, and calculate the total nitrogen removal rate and characterist...

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Abstract

The invention discloses a recovering method of a synchronous nitrosation-anaerobic ammonia oxidation and denitrification process, and belongs to the field of advanced wastewater treatment. In the SNAD (Synchronous Nitrosation-Anaerobic ammonia oxidation and Denitrification) process, NOB (Nitrite Oxidizing Bacteria) can be greatly proliferated due to inappropriate operation, and the denitrification effect of the system is continuously decreased and even broken down. According to the recovering method disclosed by the invention, (1) an aeration rate is adjusted to always maintain the dissolved oxygen concentration in the reaction stage to be under 0.3 mg/L; (2) the hydraulic retention time (HRT) is shortened, and the effluent of the reactor always contains NH4<+>-N (greater than or equal to 10 mg/L); (3) an NaOH solution is added to the inflow, and the pH value of the inflow is increased to 7.8-8.0; (4) an inorganic carbon source is artificially added to the inflow, and the ratio of the basicity to the ammonia-nitrogen concentration is maintained to be 10 (gCaCO3/Gnh4<+>-N) above. The strategies are maintained to be continuously operated until the characteristic ratio (namely the ratio of a total nitrogen removal amount to the generated nitrate-nitrogen amount) is greater than 20, the total nitrogen removal rate is greater than 75%, and the strategies are continuously operated for more than 10 cycles, and then the synchronous nitrosation-anaerobic ammonia oxidation and denitrification process is considered to be effectively recovered.

Description

technical field [0001] The invention belongs to the field of advanced sewage treatment. In particular, it relates to a recovery method for a simultaneous nitrosation-anammox and denitrification (SNAD) process. It is suitable for sewage and wastewater treatment with low carbon-to-nitrogen ratio. Background technique [0002] In the late 1980s, Mulder et al. found that in addition to the well-known denitrification reaction, there was an unknown reaction to make ammonia nitrogen disappear in the biological denitrification fluidized bed reactor, and predicted the anaerobic ammonium oxidation reaction (ANAMMOX) The existence of anammox bacteria was proved more than 10 years later. Third et al. proposed the CANON (completely autotrophic nitrogen removal over nitrite) process in 1999, which is a single-stage full autotrophic nitrogen removal process. This process is based on the principle of short-range nitrification and anaerobic ammonium oxidation reaction. Compared with the t...

Claims

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Application Information

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IPC IPC(8): C02F3/30C02F3/34
Inventor 李冬田海成梁瑜海曾辉平张杰
Owner BEIJING UNIV OF TECH
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