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Method for complementing organic carbon sources to artificial wetland

A technology of artificial wetlands and organic carbon, applied in chemical instruments and methods, sustainable biological treatment, water/sludge/sewage treatment, etc., to achieve the effects of saving manpower and material resources, improving removal rate, and simple denitrification efficiency

Inactive Publication Date: 2009-09-09
HOHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for replenishing organic carbon sources in constructed wetlands. Aiming at the above-mentioned difficult problems, technical problems such as screening of plant materials and adding methods of organic carbon sources are solved, so as to improve denitrification efficiency without affecting The effect of effluent water quality is a method of supplementing plant carbon sources in constructed wetlands that solves the key problem of supplementing plant materials as organic carbon sources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The supplementary method of plant carbon source in constructed wetland adopts the method of direct dosing. In this case, the plant material is directly added to the artificial wetland filler, and the plant material decomposes as a carbon source storage, releasing the organic carbon source required for denitrification. Because the plant material is added at one time, the amount of addition is determined according to the quality of the influent water, so this embodiment is mainly aimed at the sewage with low C / N ratio in which the water quality of the constructed wetland has less fluctuation.

[0022] The supplementary method of plant material organic carbon source has the following steps:

[0023] 1) Screen and prepare the plant materials, the combination ratio is: 30% of branches (wt%, the same below), 40% of reed straws and 30% of corn straws, and the longer branches and straw materials are cut into pieces close to the artificial wetland Filler particle size.

[0024...

Embodiment 2

[0028] As in Example 1, the plant carbon source in the constructed wetland is supplemented by direct dosing.

[0029] In this embodiment, a vertical flow artificial wetland is adopted, and the hydraulic load is 0.071m 3 / (m 2 .d), treatment of influent COD, TN (NO 3 - -N) concentration is 10mg / L. Select reed straw as the organic carbon source, and shred it to the size close to the particle size of the artificial wetland filler; supplement the carbon source material on the surface of the filler, and the supplementary amount of organic carbon source ranges from 0.43-0.91kg / m 2 .

[0030] After adding organic plant carbon sources, the constructed wetland operated in the original way, and the total nitrogen removal rate increased from 15% before supplementation to 60%-83%, and COD, TP and other water quality indicators in the effluent did not increase.

Embodiment 3

[0032] The plant carbon source replenishment method of the constructed wetland adopts the indirect dosing method, and the process steps are as follows:

[0033] 1) Screen and prepare plant materials (such as branches, wood chips, corn stalks, reeds, etc.), and the longer straw materials should be cut to <10cm as much as possible;

[0034] 2) According to the water quality and quantity to be treated, build a pool with a certain volume next to the artificial wetland distribution pool as a release pool for organic carbon sources, and configure two metering pumps (one for backup and one for use). According to the actual situation of the constructed wetland, the organic carbon source release pool can be built together with the water distribution pool. In order to prevent plant debris from entering the wetland and causing blockage and mosquito nuisance, a filter screen is installed in the release pool and covered.

[0035]3) Place the plant material in step 1) in the organic carbon...

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Abstract

The invention discloses a method for complementing organic carbon sources to an artificial wetland. The method comprises the following steps: branches, wooden meals or plant straws are taken as the organic carbon sources to be added into the artificial wetland; when the quality of fed water is stable, the organic carbon sources are directly added into fillers of the artificial wetland; when the quality of the fed water is unstable, the organic carbon sources are added into an organic carbon release pond, and decomposition liquid inside the organic carbon release pond is input to the artificial wetland. The method has economy plant materials which are easy to obtain and simple operation and sequential maintenance and management, thereby saving a great amount of manpower and materials. The invention solves the technical problem that the plant materials are complemented to the artificial wetland when processing polluted water with low carbon nitrogen ratio to enhance the denitrification efficiency of the artificial wetland by the simple method, and the method can ensure the removal rate of TN to be raised to more than 70 percent.

Description

technical field [0001] The invention relates to a method for replenishing organic carbon sources in constructed wetlands, in particular to a method for replenishing organic carbon sources for constructed wetland plants suitable for treating sewage with a low carbon-to-nitrogen ratio, and belongs to the technical field of resource and environment protection. Background technique [0002] When constructing wetlands to treat sewage with low C / N ratio, they encounter the problem that nitrogen removal efficiency is affected due to insufficient organic carbon sources. The existing solution is mainly to supplement the organic carbon source in the constructed wetland system, by adding methanol, ethanol, glucose or fructose and other easily biodegradable organic substances in the influent water, increasing the carbon-nitrogen ratio of the influent water, and promoting denitrification and denitrification. nitrogen. There is also a method to directly transport untreated raw water at t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F3/32
CPCY02W10/10
Inventor 朱伟赵联芳华国芬董婵黄靖宇
Owner HOHAI UNIV
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