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Operating method for high-efficient anaerobic ammonium oxidation reactor

A technology of anaerobic ammonium oxidation and anaerobic reactor, which is applied in the field of nitrogen removal in wastewater, can solve the problems of sensitive environmental conditions, difficulty in obtaining enriched cultures of anammox bacteria, and difficult denitrification performance. Achieve the effects of reducing operating costs, increasing total nitrogen load, and avoiding substrate inhibition

Active Publication Date: 2013-08-07
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] However, autotrophic anammox bacteria grow very slowly, with a doubling time of up to 11 days, and are extremely sensitive to environmental conditions, and it is difficult to obtain enriched cultures of anammox bacteria by traditional microbial culture methods
This feature of anammox bacteria determines that it is very difficult to obtain high-efficiency anammox bacteria enrichment culture, which also makes it very difficult for anammox reactors to obtain high denitrification performance
This severely restricts the theoretical research of anammox bacteria and the popularization and application of this new nitrogen removal process.

Method used

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  • Operating method for high-efficient anaerobic ammonium oxidation reactor

Examples

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Embodiment 1

[0023] (1) Inoculate anaerobic digested granular sludge in an upflow anaerobic activated sludge bed reactor. The sludge particle size is 2-3 mm, the sphericity is about 0.9, and the average specific gravity is about 1.6 (much greater than 1). It settles at the bottom of the reactor to form a sludge bed, and the volume of the sludge bed accounts for 60% of the total volume of the reactor.

[0024] (2) Ammonia nitrogen and nitrite nitrogen in simulated wastewater are represented by (NH 4 ) 2 SO 4 and NaNO 2 Provided, the molar ratio is 1:1, the initial concentration of ammonia nitrogen and nitrite nitrogen are both 70mg L -1 , the simulated wastewater is composed of components with the following mass composition: (NH 4 ) 2 SO 4 (70~350mg·L -1 ), NaNO 2 (70~350mg·L -1 ), KH 2 PO 4 10mg·L -1 , CaCl 2 2H 2 O 5.6mg·L -1 , MgSO 4 ·7H 2 O 300mg·L -1 , KHCO 3 1250mg·L -1, trace elements are added after being chelated with EDTA, and the composition of the trace ele...

Embodiment 2

[0028] Reactor, inoculated sludge, deaeration and temperature conditions and water inflow are all the same as in Example 1. When the reactor meets the conditions (A): nitrite nitrogen in the effluent is less than 30mg / L or (B): the effluent data (ammonia nitrogen or nitrite nitrogen concentration) is stable for three consecutive days and the concentration of nitrite nitrogen in the effluent is less than 60mg / L. Reactor operating load. The initial concentration of ammonia nitrogen and nitrite nitrogen are both 70mg·L -1 , The hydraulic retention time is 12h. After 90 days of operation, the anaerobic reactor formed anammox granular sludge enriched with anammox bacteria. The reactor runs for 1 to 180 days, the hydraulic retention time is gradually shortened from the initial 12 hours to 4 hours on the 180th day with a step of 2 hours, and the total nitrogen load of the influent is reduced from 0.42kg / (m 3 .d) increased to 0.89kg / (m 3 .d). Afterwards, gradually increase the co...

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Abstract

The invention discloses an operating method for a high-efficient anaerobic ammonium oxidation reactor. The method comprises the steps of (1) inoculating anaerobic granular sludge in an anaerobic reactor, the wherein the anaerobic granular sludge accounts for 30-90% of total volume of the reactor; and (2) taking nitrogenous simulating wastewater as reaction inflowing water, wherein the temperatureof the reactor is controlled to be in 18-37 DEG C; and in a reactor starting stage, remaining hydraulic power for 12-48h, adjusting reaction operating conditions according to concentration of ammonianitrogen and / or nitrite nitrogen, operating the anaerobic reactor for 30-150d, and forming high-efficient anaerobic ammonium oxidation granular sludge enriched with anaerobic ammonium oxidation bacteria. The method improves total nitrogen load of the reactor in a way that the load is increased gradually by lower load so as to be beneficial to stable increasing of domestication enrichment and nitrogen removing rate of the anaerobic ammonium oxidation bacteria, can effectively avoid matrix restraining of anaerobic ammonium oxidation and is beneficial to reducing process operating cost when the reactor operates under a room temperature condition.

Description

(1) Technical field [0001] The invention relates to a method for removing nitrogen in waste water, in particular to an operation method for a high-efficiency anaerobic ammonium oxidation reactor. (2) Background technology [0002] Anammox bacteria can use ammonia as an electron donor and nitrous acid as an electron acceptor to generate nitrogen gas under anaerobic conditions to achieve the purpose of green removal of nitrogen in water. As a new type of biological denitrification technology, the anammox process with anammox bacteria as the main body has the advantages of high denitrification load, low operating cost, and small footprint, and has a bright application prospect. [0003] However, autotrophic anammox bacteria grow very slowly, with a doubling time of up to 11 days, and are extremely sensitive to environmental conditions. Traditional microbial culture methods are difficult to obtain enriched cultures of anammox bacteria. This feature of anammox bacteria determine...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28
Inventor 金仁村阳广凤马春俞津津张倩倩邢保山
Owner HANGZHOU NORMAL UNIVERSITY
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