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Method and device for short-cut nitrification and denitrification in constructed wetland

A short-range nitrification and constructed wetland technology, applied in the field of environmental engineering, can solve the problems of difficult control of operating conditions and few reports on the application of constructed wetlands, and achieve the effect of promoting denitrification reaction and improving nitrogen removal efficiency

Active Publication Date: 2016-05-04
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the short-cut nitrification and denitrification technology is mainly used in the SBR process for the treatment of high-concentration ammonia-nitrogen-containing wastewater such as sludge dewatering supernatant and landfill leachate, and there are few reports on its application in constructed wetlands.
The reason is that constructed wetlands are a method of purifying sewage relying on natural ecosystems, and their operating conditions are not easy to control

Method used

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  • Method and device for short-cut nitrification and denitrification in constructed wetland

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Embodiment 1

[0035] Such as figure 1As shown, a device for realizing a short-range nitrification and denitrification method in a constructed wetland includes a constructed wetland system I pool 1 and II pool 2, and the constructed wetland system also includes a water storage tank 5 and an aeration pump 6, and the I pool 1 The bottom of the bottom is connected with the bottom of II pool 2, and the top of said II pool 2 is connected with water storage tank 5, and the outlet pipe of said water storage tank 5 is connected with the top of I pool 1 through aeration pump 6; Limestone 3 and sand 4 with The limestone-sand-limestone gradation filling system, the inlet pipe 7 is located above the I pool, and the outlet pipe 8 is located above the II pool. Fill the lower layer and the upper layer of the I pond 1 into the limestone 3 with 10% volume of the I pond 1 and an average particle diameter of 1 mm; after mixing the activated sludge and the sand 4 less than 10 mesh according to the mass ratio of...

Embodiment 2

[0049] Adopt the method of embodiment 1 to carry out short-range nitrification and denitrification in artificial wetland, when implementing, adjust influent water quality to be: NH 4 + -N concentration is 20mg / L, H 2 PO 4 - -P concentration is 8mg / L, by adding 1.8g~3.6g glucose as carbon source to achieve organic carbon (OC) concentration of 80~160mg / L, so as to adjust the carbon-nitrogen ratio between 4~8.

[0050] After 30 days of continuous operation, the removal efficiency of TN in the constructed wetland system reached over 94%. 4 + The removal rate of -N reaches 90% to 99.6%, and the removal rate of organic carbon reaches 96% to 99%.

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Abstract

The invention provides a method for short-cut nitrification and denitrification in a constructed wetland. The method comprises the steps of setting a constructed wetland system provided with a pool I and a pool II; filling the lower layer and upper layer of the pool I with limestone; evenly mixing activated sludge and sand, and then filling the middle layer of the pool I with the mixture, so that a limestone-sand-limestone grading composition type constructed wetland system is formed; filling the pool II in the same way; adjusting the content of organic carbon according to the concentration of NH4+-N in water input into the system, so that inflow water with the C / N ratio being (4:1)-(8:1) is formed; conducting aeration on the water storage pools to enable the concentration of dissolved oxygen in water to reach 9 mg / L and hydraulic retention time to be 2.5 days. According to the technical scheme, by controlling dissolved oxygen in the constructed wetland and alkalinity of the constructed wetland, short-cut nitrification and denitrification are achieved easily and conveniently in the constructed wetland, and the removal rate of total nitrogen in sewage is increased.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a method and a device for realizing short-range nitrification and denitrification in artificial wetlands. Background technique [0002] Constructed wetland, as a low-cost, easy-to-operate and maintain sewage resource ecological engineering technology, can effectively remove organic matter, suspended solids and nitrogen and phosphorus in polluted water, and has been widely used in the treatment of domestic sewage, industrial wastewater, and landfill leachate and restoration of polluted lake water bodies. However, in the relevant reports of actual operation, although many constructed wetlands have high removal rates for total suspended particulate matter and organic matter, their removal rates for nitrogen are low. Therefore, how to improve the denitrification efficiency of constructed wetlands has become a hot and difficult problem at home and abroad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCC02F3/301C02F9/00C02F2301/08
Inventor 付贵萍庾添玉宁凯乐
Owner SHENZHEN UNIV
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