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Constructed wetland water treatment system and its operation method

A water treatment system and constructed wetland technology, applied in the field of water treatment, can solve the problems of deteriorating water flow in constructed wetlands, restricting applications, surface backwaters, etc., to reduce the concentration of organic pollutants and suspended solids in the constructed wetland water Risk of clogging, life-span prolongation effect

Active Publication Date: 2021-09-28
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although constructed wetland water treatment technology is simple to operate and low in cost, its pollutant removal efficiency is not high. In practical engineering applications, in order to ensure the application effect of this technology, constructed wetlands often occupy a large area. Resources are very precious, which largely limits the application of constructed wetland water treatment technology in developed areas; secondly, when the COD (chemical oxygen demand) or SS (suspended solids) load of the constructed wetland water is too high, the inside of the constructed wetland It is easy to be blocked, and surface backwater phenomenon occurs, which will deteriorate the flow state of the internal water flow of the constructed wetland, and may reduce its pollutant treatment capacity. In severe cases, it may even cause the constructed wetland to lose its water purification ability; It is difficult to adjust flexibly. Therefore, its pollutant removal efficiency is closely related to seasons, temperature, rainfall, etc., and it cannot be adjusted according to changes in the external environment. In addition, the constructed wetland is essentially a biofilm water treatment technology, which mainly relies on microorganisms. In the cold winter, the microbial activity in the constructed wetland is low, and the pollutant removal effect is poor

Method used

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  • Constructed wetland water treatment system and its operation method
  • Constructed wetland water treatment system and its operation method
  • Constructed wetland water treatment system and its operation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) domestic sewage

[0050] The concentration of various pollutants in domestic sewage is relatively high. If only artificial wetlands are used for treatment, the occupied area is too large and it is easy to be blocked. Therefore, when dealing with domestic sewage, the researchers used electrocoagulation and sedimentation unit 1 (current density 100 A / m 2 ) + horizontal subsurface flow constructed wetland unit 2 + surface flow constructed wetland unit 3, the sludge generated by electrocoagulation and sedimentation unit 1 is discharged into sludge reed drying bed unit 4 for drying and dehydration, such as figure 1 As shown, the sludge reed drying bed unit 4 is constructed separately in the form of equipment.

[0051] The researchers used the above-mentioned system to treat domestic sewage produced in a village in Langfang City, Hebei Province, and monitored the water quality of the system's inflow and outflow for half a year. The test results show that: the number of ...

Embodiment 2

[0056] (2) Secondary effluent of sewage treatment plant

[0057] The secondary effluent of the sewage treatment plant has been biologically treated, so the concentration of pollutants is low, but if it is directly discharged into natural water bodies, it will also cause a certain degree of pollution. Therefore, when treating the secondary effluent of the sewage treatment plant, the researchers used the electrocoagulation and sedimentation unit 1 (current density 10A / m 2 ) + horizontal subsurface flow constructed wetland unit 2 + surface flow constructed wetland unit 3 operating mode, such as figure 1 As shown, the sludge reed drying bed unit 4 is constructed separately in the form of equipment.

[0058] The researchers used the above-mentioned system to treat the effluent from the secondary sedimentation tank of a sewage treatment plant in Langfang City, Hebei Province, and monitored the quality of the influent and effluent water of the system for half a year. The test resul...

Embodiment 3

[0063] (3) Pollution of river water

[0064] The concentration of suspended solids in the polluted river water is high, if it is directly treated with artificial wetlands, it will easily lead to blockage. In addition, although the concentration of organic matter in the polluted river water is not high, the organic matter contained in it is mainly refractory humus, and the treatment effect of the traditional constructed wetland treatment unit is poor. The electrocoagulation technology has a good removal effect on humus and suspended solids. Therefore, when dealing with polluted river water, the researchers used electrocoagulation and sedimentation unit 1 (current density 10A / m 2 ) + the operation mode of the surface flow constructed wetland unit 3, that is, the electrocoagulation coupling constructed wetland water treatment system includes a transcending pipeline system 5, so that the effluent from the electrocoagulation and sedimentation unit 1 directly enters the surface flo...

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Abstract

The invention belongs to the field of water treatment, and in particular relates to a constructed wetland water treatment system and an operating method thereof. The system includes sequentially connected functional treatment units and constructed wetland units, the functional treatment units include electrocoagulation and precipitation units, and the electrocoagulation and precipitation units adopt the method of mesopore combined with microporous aeration, as follows Features: The electrocoagulation and sedimentation unit adopts the method of mesopore combined with microporous aeration, and the air-water ratio is 10:1-20:1; the current density of the electrocoagulation and sedimentation unit is 10A / m 2 ‑100A / m 2 . The beneficial technical effects produced by the present invention mainly include: (1) improving the pollutant removal efficiency of the constructed wetland water treatment system; (2) reducing operating costs; (3) reducing the risk of clogging of the constructed wetland; (4) improving the overall degradation of pollution in the system material effect.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a constructed wetland water treatment system and an operating method thereof. Background technique [0002] Constructed wetland water treatment refers to artificially building pools or trenches, laying an anti-seepage water-proof layer on the bottom, filling a substrate layer with a certain depth, planting aquatic plants, and utilizing the physical, chemical and biological synergies of substrates, plants and microorganisms. Sewage is purified. Since the constructed wetland water treatment technology couples plants, microorganisms and fillers, this technology has a certain removal effect on various pollutants in sewage / waste water, so it has a wide range of applications and can be used to treat domestic sewage, sewage treatment plant effluent, and affected areas. Pollution of surface water and industrial wastewater. In addition, this technology also has the advantages ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F11/131C02F11/16C02F11/02
CPCC02F1/463C02F3/32C02F3/34C02F9/00C02F11/02C02F11/16C02F2001/007C02F11/131
Inventor 周律曹智张泽瀚白昱马可可
Owner TSINGHUA UNIV