Denitrifying denitrification method for coupling sulfur autotrophic bacteria and heterotrophic bacteria

A technology of nitrification, denitrification and heterotrophic bacteria is applied in the field of denitrification and denitrification and denitrification and denitrification in which sulfur autotrophic bacteria and heterotrophic bacteria are coupled, which can solve the problem of low denitrification efficiency, increased operating costs, and high power costs. problems, to reduce the surface water load, save investment costs, and ensure stable compliance.

Inactive Publication Date: 2019-09-27
苏州清控环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to further improve the denitrification efficiency, and the power cost is high
The existing advanced treatment method is mainly based on the denitrification deep bed filter, but the filter has the disadvantages of large area, the need to add additional carbon sources, increased operating costs, and low denitrification efficiency.

Method used

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  • Denitrifying denitrification method for coupling sulfur autotrophic bacteria and heterotrophic bacteria
  • Denitrifying denitrification method for coupling sulfur autotrophic bacteria and heterotrophic bacteria
  • Denitrifying denitrification method for coupling sulfur autotrophic bacteria and heterotrophic bacteria

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Embodiment 1

[0018] This embodiment provides a denitrification denitrification method coupled with sulfur autotrophs and heterotrophs, which includes the following steps:

[0019] (a) to the reactor (the influent of the reactor is waste water with low carbon-to-nitrogen ratio, the influent nitrate nitrogen (i.e. TN, the quality of nitrogen in sodium nitrate) concentration is 50mg / L, COD concentration is 50mg / L) Inject the inoculum sludge (A 2 / O process anaerobic pool sludge, black flocculent, may have some granulated sludge, average particle size 50-300μm, sticky and pungent odor, density 1.01-1.03g / L), making the sludge in the reactor The mud concentration is about 2.5g / L, the ratio of VSS and SS is about 0.75-0.8),

[0020] (b) Adding 400 mesh hydrophilic sulfur powder with an initial concentration of 10g / L to the wastewater, adding sodium bicarbonate according to the mass ratio of N element in sodium bicarbonate and sodium nitrate to 7.5, and adding sulfur powder and nitric acid The ...

Embodiment 2

[0024] This embodiment provides a denitrification denitrification method coupled with sulfur autotrophic bacteria and heterotrophic bacteria, which is basically the same as that in Example 1, except that in step (b), the initial concentration of 8g / L 400 mesh hydrophilic sulfur powder, add sodium bicarbonate according to the ratio of sodium bicarbonate and nitrate nitrogen to 5, and add sulfur powder according to the ratio of sulfur powder to nitrate nitrogen to 2.

Embodiment 3

[0026] This embodiment provides a denitrification denitrification method coupled with sulfur autotrophic bacteria and heterotrophic bacteria, which is basically the same as that in Example 1, except that in step (b), the initial concentration of 15g / L 400 mesh hydrophilic sulfur powder, add sodium bicarbonate according to the ratio of sodium bicarbonate and nitrate nitrogen to 8, and add sulfur powder according to the ratio of sulfur powder to nitrate nitrogen to 3.

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Abstract

The invention relates to a denitrifying denitrification method for coupling sulfur autotrophic bacteria and heterotrophic bacteria. The method comprises the following steps that a, inoculated sludge is injected into a reactor containing low-carbon-nitrogen-ratio wastewater, so that the concentration of the inoculated sludge is 2.5-5 g / L, and the ratio of VSS to SS is 0.75-0.8; b, hydrophilic sulfur powder with the initial concentration of 8-15 g / L is added into the wastewater, sodium bicarbonate is added according to the ratio of sodium bicarbonate to nitrate nitrogen is 5-8, and sulfur powder is added according to the ratio of the sulfur powder to the nitrate nitrogen is 2-3; c, after 30-40 days of starting period under the conditions that the pH value is 6.5-7.5 and the dissolved oxygen concentration of 0.2-0.5 mg / L, the method is completed. The problems are solved that in a traditional denitrification method using denitrification sulfur autotrophic bacteria, extra carbon sources need to be added, excessive carbon sources cause COD standard exceeding, insufficient carbon sources cause low denitrification efficiency, and the total nitrogen of outflow water does not meet standards.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a denitrification denitrification method, in particular to a denitrification denitrification method coupled with sulfur autotrophic bacteria and heterotrophic bacteria. Background technique [0002] In recent years, water body eutrophication has become a global problem, and total nitrogen exceeding the standard is one of the culprits of water body eutrophication, so it is imminent to solve the problem of total nitrogen. The discharge standard currently implemented by the country is the first-level A standard, which stipulates that the total nitrogen effluent index should be less than 15mg / L, while in some special areas such as Beijing and Jiangsu and Zhejiang, it is stipulated that the total nitrogen effluent should be less than 10mg / L of the special discharge limit. In some areas such as Dianchi Lake, it is even proposed that the total nitrogen can reach the stand...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F101/16
CPCC02F3/34C02F2101/16C02F2101/163C02F2305/06
Inventor 陈家轲陆宇豪
Owner 苏州清控环保科技有限公司
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