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Method and device for removing nitrate in aquaculture seawater through heterotrophism and autotrophy series connection denitrification

A technology of autotrophic denitrification and heterotrophic denitrification is applied in the field of heterotrophic autotrophic denitrification in series to remove nitrate in aquaculture seawater, which can solve the problems of low denitrification efficiency, low ammonia nitrogen concentration, and difficult realization of simultaneous nitrification and denitrification, etc. problem, to achieve the effect of saving cost, reducing the amount of consumption and the amount of sulfate radical formation

Active Publication Date: 2017-03-15
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI +1
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  • Claims
  • Application Information

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Problems solved by technology

Under these conditions, anaerobic denitrifying bacteria are inhibited, and the removal of nitrate in water cannot be achieved.
And because in the mariculture system, the concentration of ammonia nitrogen is low, far less than the content of nitrate nitrogen, therefore, simultaneous nitrification and denitrification is not easy to achieve
Aerobic biological denitrification is a denitrification technology that emerged in the 1980s. Its advantage is that denitrifying bacteria can denitrify under the condition of high concentration of dissolved oxygen, and it is not necessary to perform pre-deoxygenation treatment on the treated water. However, its disadvantages The reason is that the denitrification efficiency of anaerobic (deficient) oxygen denitrification is low

Method used

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  • Method and device for removing nitrate in aquaculture seawater through heterotrophism and autotrophy series connection denitrification

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Example 1, Heterotrophic autotrophic series denitrification device for removing nitrate in aquaculture seawater

[0038] Such as figure 1 As shown, the device for removing nitrate in cultured seawater by heterotrophic autotrophic series denitrification of the present invention comprises a heterotrophic biological denitrification unit, an autotrophic biological denitrification unit and an outlet water filtration unit;

[0039] The heterotrophic biological denitrification unit includes a heterotrophic biological denitrification bioreactor (11) and a tail gas emission absorption device I (12); It is ceramsite (13); the bottom of the heterotrophic biological denitrification bioreactor (11) is provided with water inlet I (14), and the top is provided with water outlet I (15); Above the biotrophic denitrification bioreactor (11), used to absorb the gas produced by heterotrophic denitrification;

[0040] The autotrophic biological denitrification unit comprises the autotroph...

Embodiment 2

[0045] Embodiment 2, the processing of synthetic aquaculture seawater

[0046] Utilize the device among the embodiment 1 to process artificially synthesized aquaculture seawater, concrete steps are as follows:

[0047] (1) Bacteria acclimatization: The bottom sludge of the reflux tank in Beijing Aquarium was used as the original sludge for domestication, and the original sludge was subjected to heterotrophic domestication and autotrophic domestication by using the method of gradient increasing nitrate, and the domestication period was 49 days. Heterotrophic denitrification sludge and autotrophic denitrification sludge; the method of increasing nitrate gradient is as follows: the concentration gradient is 10, 50, 100, 300, 500, 1000, 1500mg / L (in NO 3 - Concentration meter), the running time of each gradient concentration is 7 days. In the heterotrophic domestication, methanol is used as the electron donor for heterotrophic denitrification, and the dissolved oxygen in the slu...

Embodiment 3

[0054] Embodiment 3, the treatment of seawater cultured in the beluga pond of Beijing Aquarium

[0055] Utilize the device among the embodiment 1 to process the seawater cultured in the beluga pool of Beijing Oceanarium, and the specific steps are as follows:

[0056] (1) Bacteria acclimatization: The bottom sludge of the reflux tank in Beijing Aquarium was used as the original sludge for domestication, and the original sludge was subjected to heterotrophic domestication and autotrophic domestication by using the method of gradient increasing nitrate, and the domestication period was 49 days. Heterotrophic denitrification sludge and autotrophic denitrification sludge. The method of gradient increasing nitrate is as follows: the concentration gradient is 10, 50, 100, 300, 500, 1000, 1500 mg / L (based on NO 3 - Concentration meter), the running time of each gradient concentration is 7 days. In the heterotrophic domestication, methanol is used as the electron donor for heterotr...

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Abstract

The invention discloses a method and a device for removing nitrate in aquaculture seawater through heterotrophism and autotrophy series connection denitrification. The device comprises a heterotrophic organism denitrification unit, an autotrophic organism denitrification unit and an outlet water filtering unit, wherein the heterotrophic organism denitrification unit comprises a heterotrophic denitrification bioreactor; the autotrophic organism denitrification unit comprises an autotrophic denitrification bioreactor; the outlet water filtering unit comprises a solid filtering device; aquaculture seawater to be treated is sequentially introduced into the heterotrophic denitrification bioreactor, the autotrophic denitrification bioreactor and the solid filtering device, and the removal of nitrate in the aquaculture seawater can be realized. The method and the device have the advantages that on the premise of maintaining high-concentration dissolved oxygen of inlet water, the removal of nitrate in circulation aquaculture seawater is realized; the generation of nitrous acid in the outlet water is strictly controlled; the consumption of organic carbon sources and the generation quantity of sulfate radicals are reduced; the treatment cost is reduced.

Description

technical field [0001] The invention relates to a method and a device for removing nitrate in aquaculture seawater by heterotrophic autotrophic series denitrification, belonging to the technical field of water treatment. Background technique [0002] As a traditional big fishery country, China used to rely mainly on natural fishery resources. However, due to long-term overfishing, most economically important fish resources have declined sharply, and natural fishery resources are facing increasing pressure. In 1985, the government established a fishery development policy focusing on farming and encouraged the development of aquaculture. However, with the continuous increase of land and water costs, aquaculture methods are also developing from extensive to intensive and environment-friendly. Industrialized recirculating mariculture is a high-efficiency aquaculture technology that has emerged as the times require. It can not only reduce the risk of aquaculture, but also bring...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F101/16
CPCC02F3/302C02F2101/163
Inventor 强志民李彦刚栾钢董慧峪王磊
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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