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Method for enhanced nitrogen removal by utilizing constructed wetland blockages

A technology for artificial wetlands and blockages, applied in chemical instruments and methods, water pollutants, anaerobic digestion treatment, etc., to achieve the effects of shortening the preparation time, improving the removal effect, and improving the denitrification efficiency

Active Publication Date: 2017-06-23
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above technical problems, the present invention discloses a method for enhancing denitrification by using constructed wetland blockages, which can solve the problems of blockage disposal and resource utilization at low cost, and at the same time significantly improve the denitrification efficiency of constructed wetlands for treating low-carbon sewage. An efficient and multifunctional method for treating and reusing constructed wetland blockages

Method used

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  • Method for enhanced nitrogen removal by utilizing constructed wetland blockages
  • Method for enhanced nitrogen removal by utilizing constructed wetland blockages
  • Method for enhanced nitrogen removal by utilizing constructed wetland blockages

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Carbon source preparation of separate blockages: Excavate the blockages from the constructed wetland system to measure the water content of 63%, remove large particles of impurities, weigh 165g into a 2L Erlenmeyer flask, add 1.5L of water, and use 10M sodium hydroxide Adjust the pH to 12, seal the mouth of the bottle with plastic wrap, and ferment continuously in a shaker at 28°C and 120rpm / min for three days. The release of organic carbon source and total nitrogen is shown in figure 1 , the results show that COD can be obtained from the third day onwards Cr High-carbon and low-nitrogen carbon sources with a content of 1600mg / L and a TN content of less than 6mg / L.

[0035] Carbon source preparation of blockage + plant: Harvest pikegrass from the constructed wetland system, cut it to a small section of about 2cm with scissors, dry the water, add 37.5g of pikegrass according to the proportion, after 165g of blockage, add 1.5L of Water, adjust the pH to 12 with 10M sodiu...

Embodiment 2

[0041] Take blockages from the constructed wetland system, remove large particles of impurities, weigh 110g into a 2L conical flask, add 25g of dried pike grass plants, add 1L of water according to the solid-to-liquid ratio, and adjust the pH with 10M sodium hydroxide to 12. Take plastic wrap to seal the bottle mouth, and ferment continuously for 3 days in a shaker at 28°C and 120rpm / min. The supernatant of the fermentation broth was taken to determine the COD Cr The content is 3572mg / L, collected as carbon source, according to COD Cr Add the ratio of / N to 6 into the water of the artificial wetland small test system, and measure the denitrification effect after the system has been running for one day. The removal rate of total nitrogen can be increased from 53% to 98% in the control group without adding plugging fermentation broth. .

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Abstract

The invention discloses a method for enhanced nitrogen removal by utilizing constructed wetland blockages. The method comprises the following steps: recovering the blockages of a constructed wetland; preparing aged and withered plants, and drying; mixing the blockages of the constructed wetland and the aged and the withered plants, performing anaerobic fermentation after a mixture is pre-treated by utilizing strong alkali liquid, recycling supernatant fermenting liquid, and measuring COD (Chemical Oxygen Demand) Cr content and the total nitrogen content of the supernatant fermenting liquid; taking the fermenting liquid as a carbon source, adding the fermenting liquid into inlet water of the constructed wetland according to the proportion of the CODCr to N of the fermenting liquid of 4 to 8, and performing nitrogen removal treatment of the constructed wetland. By adopting the technical scheme of the invention, the nitrogen removal rate of low-carbon high-nitrogen sewage can be improved; the weight reduction treatment of waste of the constructed wetland can also be realized; the problem that the blockages affect long-term high-efficiency operation of the constructed wetland is solved; the secondary pollution is low; a biological denitrification nitrogen removal effect is good; the utilization rate of the blockages serving as regenerative resources is improved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a method for strengthening denitrification by using constructed wetland plugs. Background technique [0002] As an ecological engineering technology for sewage resource utilization, constructed wetland has low operating cost, simple maintenance, both sewage purification function and landscape ecological benefits, and has dual advantages in economy and effect when purifying high-nitrogen sewage. However, from the perspective of engineering practice, during the long-term operation of the constructed wetland, due to its pollution tolerance, improper design or poor management, it is very easy to be blocked. After the constructed wetland is blocked, the sewage entering the wetland cannot be mixed with The full contact of the filler and the contact time with microorganisms and plants are also greatly shortened, resulting in a decrease in nitrogen removal efficiency...

Claims

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Application Information

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IPC IPC(8): C02F3/28C02F3/32C02F101/16
CPCC02F3/28C02F3/32C02F2101/163C02F2101/166Y02W10/10
Inventor 付贵萍庾添玉
Owner SHENZHEN UNIV
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