Method for enhancing biological denitrogenation effect of constructed wetland

A technology for artificial wetlands and biological denitrification, applied in chemical instruments and methods, biological water/sewage treatment, special compound water treatment, etc., can solve agricultural waste and treatment process without integrated design, slow release rate and denitrification Difficult to match carbon source demand, complex process operation and management, etc., to achieve stable and controllable operation, saving denitrification effect, and reducing sludge production

Active Publication Date: 2017-12-05
HEFEI UNIV OF TECH
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Problems solved by technology

However, the use of agricultural waste as an additional slow-release carbon source also faces difficult problems: (1) the slow-release rate of agricultural waste carbon source and the demand for denitrification carbon source are difficult to match, which is likely to cause secondary pollution; (2) Agricultural waste and treatment processes are not designed in an integrated manner, which complicates process operation and management

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  • Method for enhancing biological denitrogenation effect of constructed wetland
  • Method for enhancing biological denitrogenation effect of constructed wetland

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specific Embodiment

[0029] In this example, corn cob was selected as the slow-release carbon source, and the stable slow-release rate of corn cob measured by static test was about 1 mg COD / (g·d). After the nitrate nitrogen is added to the effluent of the campus domestic sewage through the membrane bioreactor (because the concentration of nitrate nitrogen in the effluent after domestic sewage treatment is less than 5mg / L, in order to make the treatment effect of the constructed wetland more obvious, add 25mg / L to the effluent L of potassium nitrate) as the influent of the constructed wetland. The influent water volume of the constructed wetland is 10L / d, the influent COD is less than 30mg / L, the nitrate nitrogen concentration is about 30mg / L, and the influent ammonia nitrogen is less than 1.5mg / L. The design of this embodiment adopts COD:TN=6 to add the slow-release carbon source, that is, add 1800g corncob as the slow-release carbon source, but the dosing device can only accommodate 400g corncob,...

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Abstract

The invention discloses a method for enhancing the biological denitrogenation effect of constructed wetland. According to the invention, a carbon source slow-release apparatus is arranged at a front end of the constructed wetland, sewage passes through the carbon source slow-release apparatus, and then is introduced into the constructed wetland; the external part of the carbon source slow-release apparatus is formed by a netted framework structure, and the agricultural waste is provided in the internal part of the carbon source slow-release apparatus. The agricultural waste is placed at the front end of the constructed wetland, by controlling the adding rate of the agricultural waste and blending ratio, the slow release effect of the agricultural waste is used for providing a carbon source for denitrification and nitrogen removal for the constructed wetland, so that the total nitrogen removing rate of the constructed wetland is increased.

Description

technical field [0001] The invention relates to a method for enhancing the biological denitrification effect of artificial wetlands, which belongs to the field of water pollution control and sewage treatment. Background technique [0002] Constructed wetlands refer to artificially constructed pools or trenches, filled with fillers of a certain thickness, an anti-seepage layer at the bottom, and aquatic plants planted at the top, using the biochemical action of filler adsorption and the combination of plants and microorganisms to achieve sewage purification. Constructed wetlands have the advantages of stable treatment effect, low operating cost, low investment, strong impact load resistance, etc., and have certain ornamental value and economic benefits. widely used. [0003] The purification mechanism of constructed wetlands is mainly to use the synergistic effect of microorganisms, plants, and matrix composite ecosystems to achieve efficient sewage treatment. The treatment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32C02F3/28
CPCC02F3/28C02F3/32C02F2305/06
Inventor 王伟杨传贺裘诚刚胡真虎俞汉青袁守军
Owner HEFEI UNIV OF TECH
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