Sewage and wastewater pretreatment method for artificial wetland process

A technology for constructed wetlands and wastewater, which is applied in the fields of aerobic process treatment, biological water/sewage treatment, water/sludge/sewage treatment, etc. Degradation, limited efficiency of organic matter treatment, etc., to achieve the effect of increasing dissolved oxygen content, reducing engineering investment and labor costs, and easy management and maintenance

Inactive Publication Date: 2010-10-06
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many reports in the literature that after the above-mentioned pretreated constructed wetland system has been in operation for a long time (7-10 years), the pore blockage of large-area planting beds still occurs, and the removal efficiency of suspended solids needs to be developed. Higher Constructed Wetland Pretreatment Methods
In addition, the main pretreatment structures commonly used in the world are mainly anaerobic reactors. Although they have the advantages of convenient management and maintenance and low operating costs, the concentration of dissolved oxygen in the effluent is mostly zero, which is not conducive to the subsequent removal of pollutants in wetlands. Aerobic degradation, and its treatment efficiency for organic matter is limited, and it has almost no degradation effect on ammonia nitrogen, so it cannot effectively reduce the area occupied by constructed wetlands

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] ① Excavate the ground at the proposed hydroponic tank to a depth of about 10cm and a rectangular tank with a width of no more than 1m, tamp the side walls and bottom of the tank, and lay 0.1-0.5mm thick waterproof geotextile or high-density polyethylene anti-seepage membrane, etc. Flexible waterproof material, the edge of the flexible waterproof material is compacted and fixed with excavated soil or plain concrete. The slope of the tank bottom is not less than 2‰;

[0019] ②According to the influent water quality, control the hydraulic load to 0.01-0.5m 3 / m 2 d. When the concentration of influent organic matter and suspended solids is high (such as higher than 200mg / L), take a low value, and when the concentration is low (such as lower than 100mg / L), take a high value. In addition, lower values ​​should be taken in northern areas with longer winters. Determine the total length of the hydroponic tank according to the selected hydraulic load. When the length of the pr...

Embodiment 2

[0026] 1. Step 1. with embodiment 1.

[0027] 2. with the step of embodiment one 2.;

[0028] 3. with the step of embodiment one 3.;

[0029] ④Rinse the root soil of cannas in spring or summer, fix the cannas in the planting baskets with flexible materials, and fix the planting baskets to the frame made of wooden keels or bamboo slices according to the density of 0.2-0.3m between rows. , the width of the frame is 3-5cm less than the width of the hydroponic tank, and the length is generally 1-2m, which can be flexibly set according to the length of the tank;

[0030] 5. with the step 5 of embodiment one;

[0031] 6. Step 6. with Embodiment 1.

[0032] ⑦After the canna withers in early winter, follow steps ④ and ⑤ to replant the canna with winter wheat. When the plant height of the canna in the next spring reaches 20 cm or more, replant the winter wheat with canna, or wait until the winter wheat matures and replant the canna. Its replacement is canna. The sludge disposal me...

Embodiment 3

[0035] ① Excavate a rectangular tank with a depth of about 10cm and a width of no more than 1m at the proposed hydroponic tank. After tamping, pour concrete with an impermeability level equal to or greater than S6 standard with a thickness of about 10cm on the side wall and bottom of the tank. The slope of the tank bottom is not less than 2‰;

[0036] ②According to the influent water quality, control the hydraulic load to 0.01-0.3m 3 / m 2 d. When the concentration of influent organic matter and suspended solids is high (such as higher than 200mg / L), take a low value, and when the concentration is low (such as lower than 100mg / L), take a high value. In addition, lower values ​​should be taken in northern areas with longer winters. Determine the total length of the hydroponic tank according to the selected hydraulic load. When the length of the proposed site is not enough, the hydroponic tank can be built into a fold-back type, and the thickness of the partition wall is not le...

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PUM

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Abstract

The invention relates to a sewage and wastewater pretreatment method for an artificial wetland process, which comprises the following steps of: building a water culture tank, and controlling inlet water hydraulic load to determine hydraulic power retention time; according to different varieties of plants, respectively fixing the plants in planting baskets with flexible materials according to different planting densities, and fixing the planting baskets to light materials, or directly fixing the plants to light plate materials floating on water or directly planting the plants in sewage; and guiding the sewages or wastewater subjected to grid and sediment treatment into the water culture tank, putting the prepared plants into the water culture tank, and making the outlet water of the water culture tank directly flowed or pumped to the subsequent artificial wetland. The method can quickly and effectively remove a large quantity of suspended solids and more than a half of organic matters which probably cause the blockage of the artificial wetland in the sewage and wastewater, can obviously improve the dissolved oxygen content in the sewage and wastewater flowing through the water culture tank, improves the efficiency of the wetland of removing pollutants in the water, reduces the area occupied by the artificial wetland, and reduces the investment and operating cost of sewage and wastewater treatment facilities.

Description

technical field [0001] The invention relates to a sewage and wastewater pretreatment method, in particular to a sewage and wastewater pretreatment method utilizing artificial wetland technology. Background technique [0002] In recent years, there have been more and more technologies using artificial wetland technology to treat domestic sewage and industrial wastewater and use the treated water as reused water, and it has been paralleling the activated sludge method, the main process of sewage treatment, in foreign countries. At present, the most widely used new constructed wetlands are mainly subsurface flow wetlands and vertical flow wetlands. Compared with traditional free surface flow wetlands, the two have obvious advantages in improving pollutant removal efficiency and reducing land occupation; Compared with the sludge method, further improvement is still needed in the removal of nutrients such as nitrogen and phosphorus and the stability of the system operation. At p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32C02F3/34C02F3/02
CPCY02W10/10
Inventor 任勇翔
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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