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Stable and efficient short-cut denitrification method and treatment device

A short-range denitrification and treatment device technology is applied in the field of stable and high-efficiency short-range denitrification methods and treatment devices, and can solve the problems of low nitrite efficiency, large dosage of chemicals, complicated process routes, etc., and achieve the effect of reducing the dosage of chemicals.

Active Publication Date: 2022-07-15
ZHEJIANG UNIV
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  • Description
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  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the defects of low efficiency of short-range denitrification accumulation of nitrite, large dose of chemicals, complex process route and other defects in the prior art, and provide a A stable and efficient short-range denitrification method and treatment device

Method used

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  • Stable and efficient short-cut denitrification method and treatment device
  • Stable and efficient short-cut denitrification method and treatment device
  • Stable and efficient short-cut denitrification method and treatment device

Examples

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Embodiment 1

[0047] In this embodiment, the process flow of the present invention is used to treat the simulated wastewater.

[0048] Configure simulated wastewater containing nitrates. The water quality is as follows: pH is 6.8, and nitrate ion (NO) in wastewater is determined by ion chromatography. 3 - -N) at a concentration of 50 mg / L.

[0049] Pass the simulated wastewater through figure 1 The stable and high-efficiency short-range denitrification treatment device shown is used for treatment, and MBfR is used as the site for the treatment of nitrate-containing wastewater. The reactor is pre-inoculated with nitrate-reducing bacteria enriched in advance. In this embodiment, the hollow fiber membrane in the MBfR membrane biofilm reactor adopts a membrane module with an effective length of 1 m for the enrichment and growth of denitrifying bacteria. The lid of the reactor adopts a flange structure, which is fixed by 8 M8 bolt-nut assemblies and rubber gaskets to ensure the airtightness...

Embodiment 2

[0054] The treatment device, method and operating conditions of this embodiment are the same as those of embodiment 1, the difference is only in controlling the hydraulic retention time of different reactors, and four gradients of 5h, 10h, 15h and 20h are set for HRT. like image 3 As shown, the results show that the reactor can stably convert nitrate nitrogen to nitrous nitrogen with a conversion rate of ≥90% under different hydraulic retention times under the same influent conditions as other operating conditions. From the viewpoint of conversion rate, HRT is preferably set to 10-20 h, more preferably 15-20 h.

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Abstract

The invention discloses a stable and efficient short-cut denitrification method and a treatment device, and belongs to the technical field of environment-friendly wastewater treatment. The method comprises the following steps: introducing the nitrate-containing wastewater into a hydrogen matrix anaerobic bioreactor inoculated with nitrate reducing bacteria for continuous flow treatment, and controlling the pH value of a mud-water mixed system in the reactor to be 10.5-11, so that the nitrate reducing bacteria in the reactor uses hydrogen as an electron donor to reduce nitrate ions (NO3--N) in the wastewater into nitrite ions (NO2--N) and accumulate the nitrite ions (NO2--N). Compared with the traditional short-cut denitrification method, the method provided by the invention has the advantages that nitrate nitrogen is converted into nitrite nitrogen and accumulated under high pH by using a hydrogen matrix membrane biological membrane bioreactor, the consumption of a carbon source is reduced, theoretically, no organic carbon source is added, no chemical is added for pH regulation and control, the operation is simple and convenient, and the removal rate is high.

Description

technical field [0001] The invention belongs to the technical field of environmental protection wastewater treatment, and in particular relates to a stable and efficient short-range denitrification method and a treatment device. Background technique [0002] With the increasing demand for carbon emission reduction, carbon emission reduction in the process of sewage denitrification has become a matter of concern. Anaerobic ammonium oxidation (using ammonia nitrogen (NH + 4 -N) and nitrous nitrogen (NO 2 - -N) Nitrogen gas (N) is generated by microbial reaction 2 )) as a denitrification method that does not require a carbon source, it has shown extraordinary prospects, but most of the nitrogen-containing pollutants in nitrogen-containing sewage are mainly ammonia nitrogen, and the supply of electron acceptors for anammox is insufficient. [0003] At present, microbial methods supply nitrite nitrogen (NO 2 - ) methods mainly include short-range nitrification (ammonia nit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28C02F3/34C02F101/16
CPCC02F3/28C02F3/34C02F3/2853C02F3/006C02F2101/163
Inventor 赵和平高天宇韦潇雯石凌栋
Owner ZHEJIANG UNIV
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