Subsurface wetland with effluent N/P suitable for culturing non-toxic green alga

A technology of subsurface wetlands and green algae, applied in the field of environmental engineering, can solve problems such as water pollution, achieve the effects of inhibiting proliferation, reducing COD, and good economic value

Active Publication Date: 2014-11-12
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If it is directly discharged into natural w

Method used

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  • Subsurface wetland with effluent N/P suitable for culturing non-toxic green alga
  • Subsurface wetland with effluent N/P suitable for culturing non-toxic green alga
  • Subsurface wetland with effluent N/P suitable for culturing non-toxic green alga

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A subsurface wetland with effluent N / P suitable for the cultivation of non-toxic green algae, such as figure 1 As shown, including the treatment pool, water inlet 2 and water outlet 8 are respectively set at the front and back of the treatment pool. The interior of the treatment pool is sequentially composed of wetland plant layer 3, soil layer 4 and filler medium layer from top to bottom, and the filler medium layer is according to the direction of water flow. It is divided into a pre-treatment area 5, an intermediate treatment area 6 and a post-treatment area 7. The pre-treatment area 5, the intermediate treatment area 6 and the post-treatment area 7 respectively contain zeolite and steel slag in different proportions. A buffer zone 1 is provided in front of the treatment tank, a water inlet 2 is located in the upper area of ​​the buffer zone 1, and a water outlet 8 is located in the lower area of ​​the post-treatment area 7 .

[0044] The working parameters of the pr...

Embodiment 2

[0053] The concentration of total phosphorus in the influent is 1mg / L, the concentration of ammonia nitrogen in the influent is 5.4mg / L, the concentration of nitrate nitrogen is 10.8mg / L, and the COD is 52mg / L.

[0054] use as figure 1 Subsurface wetlands shown for water treatment, each zone 6m long, hydraulic retention time 4h per zone, hydraulic load 0.5-0.6m 3 / m 2 d. Among them, the amount of zeolite in the pre-treatment area is 0.1t, and the amount of steel slag is 0.8t; the amount of zeolite in the intermediate treatment area is 0.2t, and the amount of steel slag is 1.1t; the amount of zeolite in the post-treatment area is 0.225t, and the amount of steel slag is 0.175t. The porosity of the mixed filler is 35%.

[0055] After treatment, the concentration of total phosphorus in the effluent is 0.4mg / L, the concentration of nitrate nitrogen is 8.3mg / L, the concentration of ammonia nitrogen is 0.5mg / L, and the concentration of total nitrogen is 8.8mg / L.

Embodiment 3

[0057] Influent total phosphorus concentration is 1.45mg / L, influent ammonia nitrogen concentration is 9.5mg / L, nitrate nitrogen concentration is 15mg / L, and COD is 80mg / L.

[0058] use as figure 1 Subsurface wetlands shown for water treatment, each zone 6m long, hydraulic retention time 4h per zone, hydraulic load 0.5-0.6m 3 / m 2 d. Among them, the amount of zeolite in the pre-treatment area is 0.1t, and the amount of steel slag is 0.7t; the amount of zeolite in the intermediate treatment area is 0.18t, and the amount of steel slag is 1.1t; the amount of zeolite in the post-treatment area is 0.22t, and the amount of steel slag is 0.20t. The porosity of the mixed filler is 35%.

[0059] After treatment, the concentration of total phosphorus in the effluent is 0.5mg / L, the concentration of nitrate nitrogen is 9.8mg / L, the concentration of ammonia nitrogen is 1.7mg / L, and the concentration of total nitrogen is 11.5mg / L.

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Abstract

The invention relates to a subsurface wetland with effluent N/P suitable for culturing non-toxic green alga. The subsurface wetland comprises a treating pond, wherein a water inlet and a water outlet are respectively formed in front and rear parts of the treating pond; the inside of the treating pond comprises a wetland plant layer, a soil layer and a packing medium layer from top to bottom sequentially; the packing medium layer is divided into a front treatment zone, an intermediate treatment zone and a rear treatment zone according to the water current direction; and the front, intermediate and rear treatment zones respectively contain zeolite and steel slag in different proportions. Compared with the prior art, the subsurface wetland has the advantages that wastewater which is substandard after secondary treatment is subjected to oriented deep treatment; the structure is simple, blockage is prevented and management is convenient; the total nitrogen concentration of effluent is 8-12mg/L, the total phosphorous concentration is 0.4-0.5mg/L, and N/P is 20-30. The water quality of treated water is beneficial to control of eutrophication of receiving water from the source and has a certain economic value by means of ecological reclamation; moreover, after the secondary treated wastewater is further treated by virtue of the subsurface wetland, COD is further reduced.

Description

technical field [0001] The invention relates to a subsurface wetland, in particular to a subsurface wetland with effluent N / P suitable for the cultivation of non-toxic green algae, and belongs to the technical field of environmental engineering. Background technique [0002] The effluent of activated sludge with poor nitrification effect, or the secondary effluent of some petrochemical wastewater containing high ammonia nitrogen content, usually ranges from 5-10 mg / L of ammonia nitrogen, 10-15 mg / L of nitrate nitrogen, and 10 mg / L of phosphorus. -1.5mg / L. If it is directly discharged into natural water, it will cause serious water pollution. It is difficult for the effluent to meet the water quality discharge standard, and it is necessary to strengthen the terminal treatment of the effluent. [0003] Constructed wetlands are artificially constructed ecosystems that simulate natural wetlands. With the characteristics of high efficiency, low investment, low energy consumpti...

Claims

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Application Information

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IPC IPC(8): C02F3/32
CPCY02W10/10
Inventor 陈秀荣江子建何怡萱王璐赵建国赵骏章斐闫龙鲍征
Owner EAST CHINA UNIV OF SCI & TECH
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