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Construction method of surface flow wetland system

A construction method and wetland technology, applied in chemical instruments and methods, polluted waterways/lakes/ponds/rivers treatment, sludge treatment, etc., can solve the problem of large endogenous nutrient load in sediments and difficult restoration of submerged vegetation , large greenhouse gas emissions and other issues, to achieve the effect of promoting fixation and mineralization, increasing the oxidation-reduction potential of the substrate, and reducing the nitrogen load

Inactive Publication Date: 2021-10-01
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the current surface flow wetlands do not have a strong purification function for water quality, and there are problems such as difficult restoration and colonization of submerged vegetation, water quality deterioration during plant decline, large endogenous nutrient load in sediments, and large greenhouse gas emissions.

Method used

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  • Construction method of surface flow wetland system
  • Construction method of surface flow wetland system
  • Construction method of surface flow wetland system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Construct 4 sets of surface flow artificial wetland devices with the same size: 1.0m×0.25m×0.7m. The bottom of the device is laid with the same sediment, the thickness is 10cm, and the organic matter content is 8%. The device numbers are ①, ②, ③, ④.

[0065] Surface flow wetland ①: blank control group, no submerged plants are planted, no iron-based materials are added to the substrate;

[0066] Surface flow wetland ②: Plant the submerged plant Erythrina fragrans, with a planting density of 100 plants / m 2 ;

[0067] Surface flow wetland ③: Add iron-based material iron shavings to the bottom, the iron shavings are inserted into the bottom mud layer, the depth is 2-8cm, and the dosage is 100g / m 2 ;

[0068] Surface flow wetland ④: According to the direction of water flow, plant the submerged plant Erythrina chinensis in the first half of the device, with a planting density of 100 plants / m 2 , add iron shavings to the second half of the bottom, the iron shavings are pla...

Embodiment 2

[0076] The implementation site of this embodiment is a slow-flowing river in a certain city in Shanghai. The river runs east-west, the west side is Duantou River, and the east side is connected with another north-south river. The length of this river section is about 500m. Due to the influence of surface runoff, the content of ammonia nitrogen, total nitrogen and total phosphorus in the water body is relatively high, and the level of surface water is inferior to Class V.

[0077]In this embodiment, a surface flow wetland system is constructed on the basis of a slow-flowing river. The specific method is as follows:

[0078] Construction of submerged vegetation planting area: Based on the original terrain of the river, some steep embankments are transformed into gentle slopes, and submerged vegetation is planted on both sides of the river where the water depth is less than 1.0m. Submerged plants include bitter grass, hornwort and black algae , the planting density is 100 plants / ...

Embodiment 3

[0086] The implementation site of this example is a landscape water body in Shanghai. The landscape water body is an artificial lake. The water source is pumped into the river channel water. 23,000 m 2 , there is a small amount of submerged vegetation growing in the lake area, and the transparency of the water body is as low as 40±15cm.

[0087] In this embodiment, the surface flow wetland is constructed on the basis of the landscape water body, including the following steps:

[0088] The construction of submerged vegetation planting area: Based on the original terrain of the lake area, some steep embankments are transformed into gentle slopes, and submerged plants are planted on both sides of the lakeshore where the water depth is less than 0.6m and in the area where the water depth is less than 0.8m. Grass, foxtail and weed, the planting density is 100 plants / m 2 ; The construction area of ​​the submerged vegetation planting area is 55% of the water area.

[0089] The con...

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Abstract

The invention relates to the technical field of water ecological restoration and water environment treatment, and provides a construction method of a surface flow wetland system. According to the invention, the submerged plant planting area and the substrate improvement area are constructed in the water area, so that the interior of the surface flow wetland system achieves coexistence of an aerobic area and an anoxic / anaerobic area, thereby improving the purification capacity of the surface flow wetland system; meanwhile, an iron-based material is added into the substrate improvement area, and the iron-based material can strengthen denitrification and anaerobic ammonia oxidation processes of the anaerobic area, fix phosphorus in the water body and the substrate, reduce release of phosphorus in the substrate, control endogenous nitrogen and phosphorus loads of the substrate and change the microenvironment of the substrate; and the oxidation-reduction potential can be increased in the iron (III) reduction process, so that methane generation is inhibited, and emission of greenhouse gases is reduced. According to the method provided by the invention, the water body purification capacity and ecological bearing capacity of the surface flow wetland can be remarkably improved, and the method can be widely applied to improvement of water quality and substrate of urban slow flow rivers, wetland parks, ditches and landscape water bodies.

Description

technical field [0001] The invention relates to the technical field of water ecological restoration and water environment treatment, in particular to a method for constructing a surface flow wetland system. Background technique [0002] With the development of human society, economy and technology and the change of global climate, natural wetlands are in the doom of continuous degradation, and the severity is increasing day by day. At the same time, urban production and life are increasingly polluting major water bodies. Water purification technology that treats initial rainwater and sewage in the form of artificial wetlands and then reflows them into other major water bodies has developed rapidly in recent years; especially using the existing Surface flow wetlands, ditch-type wetlands and ecological ponds transformed from river courses, ditches and ponds have been widely promoted and applied in urban and rural areas. [0003] With the implementation of the ecological resto...

Claims

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Application Information

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IPC IPC(8): C02F3/32C02F3/30C02F11/00
CPCC02F3/32C02F3/325C02F3/303C02F3/305C02F11/00C02F2103/007
Inventor 何圣兵严攀孙珊珊吴菲崔锡俊刘泽萱丁怡婧陈嘉捷
Owner SHANGHAI JIAO TONG UNIV
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