Design method based on three-pollution load for subsurface constructed wetland

A technology of constructed wetlands and pollution load, applied in the field of constructed wetland area measurement, can solve the problems of scientific design of constructed wetlands, wetland effluent water quality cannot meet the expected treatment effect, affect pollutant removal efficiency and other problems, and achieve the goal of ensuring water quality purification effect Effect

Inactive Publication Date: 2015-08-05
TIANJIN ACADEMY OF ENVIRONMENTAL SCI
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AI Technical Summary

Problems solved by technology

However, in the design of constructed wetlands, due to the lack of unified standards for the calculation of the constructed wetland area, different wetland projects adopt different design methods in the design, for example, some use organic pollution load, some use total nitrogen load, and some use total nitrogen load. Phosphorus load; for pollution load, some use area pollution load, and some use hydraulic pollution load
These have brought troubles to the scientific design of artificial wetlands
In the stage of wetland design, if the differences in the removal effects of various pollution loads by the constructed wetland cannot be comprehensively planned, the result will be to neglect the other in the design of the wetland, and the designed wetland area is inconsistent with the actual land occupation index requirements, which will affect the wetland’s ability to handle pollutants. The removal efficiency makes the wetland effluent water quality not reach the expected treatment effect

Method used

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  • Design method based on three-pollution load for subsurface constructed wetland
  • Design method based on three-pollution load for subsurface constructed wetland
  • Design method based on three-pollution load for subsurface constructed wetland

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Experimental program
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Effect test

Embodiment 1

[0031] Example 1

[0032] according to figure 1 The instructions carefully describe the design method:

[0033] Based on three pollution load response / adsorption kinetic models, mainly considering the relationship between the pollutant treatment load of constructed wetlands and the required wetland area, three kinds of pollution load-area equations are established and derived:

[0034]

[0035] At the same time, it is necessary to maintain a certain hydraulic retention time to meet the requirements of nitrification-denitrification time.

[0036]

[0037] The required parameters of the model are as follows:

[0038]

[0039] Table Model parameter table

[0040] According to the designed artificial subsurface flow wetland's daily sewage treatment volume, influent sewage water quality and effluent water quality requirements, solve the equations to obtain the minimum area required for the artificial wetland based on organic pollutants, nitrogen, and phosphorus loads, a...

Embodiment 2

[0042] A design method for constructed wetlands based on three pollution load subsurface flows: using the method of determining the area of ​​constructed wetlands based on three types of pollution loads, comprehensively considering the purification mechanism and efficiency of different pollutants in constructed wetlands, and designing the area parameters of constructed wetlands, the procedure is :

[0043](1) According to the artificial subsurface flow wetland organic pollutants, total nitrogen, and total phosphorus three pollution loads, respectively calculate the minimum surface area required for the artificial subsurface flow wetland that meets the pollution removal conditions of the three types of pollution;

[0044] (2) Select the maximum surface area of ​​the artificial subsurface flow wetland that meets the above conditions as the design area of ​​the artificial subsurface flow wetland; compare the design area with the actual usable land area, if the design area is s...

Embodiment 3

[0055] Taking the design of an artificial subsurface flow wetland as an example, the design method of the subsurface flow constructed wetland based on three pollution loads is illustrated. The available wetland area of ​​the research object to be constructed is 25ha, the thickness of the substrate layer of the artificial subsurface flow wetland is designed to be 1m, and the slope is designed to be 0.01. The influent COD concentration is 60mg / L, and the designed effluent COD concentration is 50mg / L; the influent TN concentration is 20mg / L, and the designed effluent TN concentration is 15mg / L; the influent TP concentration is 1mg / L, and the designed effluent TP concentration is 0.5mg / L; the preliminary wetland design plants are mainly reeds, and the wetland filler is gravel. The water temperature is 20°C, and the daily sewage treatment volume is 17,500m 3 / d.

[0056] (1) Wetland area design based on organic pollution load

[0057] The preliminary design of the horizontal sub...

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Abstract

The invention relates to a design method based on three-pollution load for subsurface constructed wetland. The design method is based on a three-pollution load reaction/adsorption kinetic model, the relationship between constructed wetland pollutant treatment load and a required wetland area is mainly taken into account, and three-pollution load-area equation set is established and deduced. The equation set is solved according to designed constructed wetland design operation water amounts and effluent quality data, so that the constructed wetland required area based on organic pollutant, nitrogen and phosphorus load can be obtained, and the maximum value is set as an ideal wetland area; if the area is smaller than a practical available area, intensification facilitates are additionally arranged, and the wetland area is remeasured and calculated. By adopting the design method, purification of water with organic pollutants, nitrogen and phosphorus, of the constructed wetland, is comprehensively considered, and the water purification effect of the wetland can be effectively ensured.

Description

technical field [0001] The invention belongs to the technical field of artificial wetland design and can be applied to the area measurement and calculation of artificial wetland in the feasibility study and design of artificial wetland. Background technique [0002] As a natural ecological water treatment technology, artificial wetland has been widely promoted and applied in the past two decades due to its low energy consumption and simple operation and management requirements. However, in the design of constructed wetlands, due to the lack of unified standards for the calculation of the constructed wetland area, different wetland projects adopt different design methods in the design, for example, some use organic pollution load, some use total nitrogen load, and some use total nitrogen load. Phosphorus load; for pollution load, some use area pollution load, and some use hydraulic pollution load. These have brought troubles to the scientific design of constructed wetlands. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32
CPCY02W10/10
Inventor 邵晓龙卢学强马喆
Owner TIANJIN ACADEMY OF ENVIRONMENTAL SCI
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