Method for relieving blockage of constructed wetland

A technology for artificial wetlands and wetlands, applied in the field of water environment management, can solve the problems of destroying the biofilm of the wetland system, microbial inoculants and weak competition with the wetland indigenous microorganisms, changing the living environment of plant microorganisms in the wetland system, etc. substances, improve hydraulic conductivity, and improve the effect of microbial activity

Inactive Publication Date: 2016-07-20
INST OF AQUATIC LIFE ACAD SINICA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) The amount of engineering is large and the cost is high, which is contrary to the principle of energy conservation and environmental protection of constructed wetlands
[0004] (2) Caused disturbance or damage to the wetland system, affecting the normal operation of the wetland
[0006] (1) In-situ biological plugging removal technology is difficult to overcome the weak adaptability of introduced organisms to constructed wetlands, such as earthworms are difficult to survive in wetland substrates that have been floo

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for relieving artificial wetland blockage, the steps are:

[0030] A. Plugging and dissolution: 3 artificial wetland simulation columns, the wetland water load is 0.3m 3 / (m 2 d). Rhamnolipids were used to dissolve the three blocked constructed wetlands, and rhamnolipids were added to the influent with concentrations of 0.09, 0.12 and 0.15 g / L, respectively. The rhamnolipid amphoteric groups interact with the wetland components respectively, destroying the structure of the extracellular polymer (EPS), and dispersing and solubilizing the large particle blockages connected by EPS.

[0031] B. The blockage is washed out of the wetland system: the influent water stays in the wetland for 20 hours, and after 20 hours, the wetland system is emptied for 3 or 4 or 5 hours. Excessively accumulated extracellular polymers are eluted, and the effluent carries the solubilized and dispersed plugs, restoring the wetland porosity and hydraulic conductivity.

[0032] C. Repe...

Embodiment 2

[0036] A method for relieving artificial wetland blockage, the steps are:

[0037] A. Blockage stripping: Rhamnolipid was used to dissolve 3 plugged artificial wetland simulation columns, and rhamnolipid was added to the influent water at concentrations of 0.09, 0.12, and 0.15g / L. The rhamnolipid amphoteric groups interact with the wetland components respectively to destroy the structure of the extracellular polymer, disperse and solubilize the large particle blockages connected by the extracellular polymer.

[0038] B. The blockage is washed out of the wetland system: the influent water stays in the wetland for 20 hours, and after 20 hours, the wetland system is emptied for 3 or 4 or 5 hours. Excessively accumulated extracellular polymers are eluted, and the effluent carries the solubilized and dispersed plugs, restoring the wetland porosity and hydraulic conductivity.

[0039] C. The dissolution effect produces a positive effect: the addition of rhamnolipids destroys the ex...

Embodiment 3

[0044] A method for relieving artificial wetland blockage, the steps are:

[0045] A. Clogging and stripping: use rhamnolipid to dissolve and strip three simulated wetland columns that have been plugged, and add rhamnolipid to the influent water at a concentration of 0.09, 0.12 and 0.15 g / L respectively. The rhamnolipid amphoteric groups interact with the wetland components respectively to destroy the structure of the extracellular polymer, disperse and solubilize the large particle blockages connected by the extracellular polymer.

[0046] B. The blockage is washed out of the wetland system: the influent water stays in the wetland for 20 hours, and after 20 hours, the wetland system is emptied for 3 or 4 or 5 hours. Excessively accumulated extracellular polymers are eluted, and the effluent carries the solubilized and dispersed plugs, restoring the wetland porosity and hydraulic conductivity.

[0047]C. The dissolution effect has a positive effect: the addition of rhamnolipi...

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PUM

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Abstract

The invention discloses a method for relieving blockage of a constructed wetland. The method comprises the steps as follows: A, the blockage is desolventized: 0.09-0.15 g/L of a biosurfactant, namely, rhamnolipid is dosed into inflow water of the wetland, inflow water enters the wetland and remains for desolventizing of the blockage of the wetland, the hydrophobic group end of rhamnolipid is bound with an organic group of an extracellular polymeric substance, the hydrophilic end is bound with pore water in the constructed wetland, and large-particle blockages connected by the extracellular polymeric substance are dispersed and solubilized; B, the blockages are eluted out of a wetland system: the wetland is emptied; C, the desolventizing action generates positive effects: the solubilizing and dispersing effects of rhamnolipid destroy the structure of the extracellular polymeric substance, so that bound enzymes are released, and contact among microorganisms, the enzymes and substrates is promoted; D, according to the condition of the wetland, desolventizing is performed for a plurality of times on the constructed wetland which begins to show a trend in blockage or is blocked till the blockage condition is improved. The method is easy to use, an appropriate amount of rhamnolipid is directly dosed into the inflow water of the wetland, the inflow water enters the wetland and remains for an appropriate period, and the method is suitable for recovery of the wetland which begins to show a trend in blockage or is blocked.

Description

technical field [0001] The invention relates to the field of water environment treatment, in particular to a method for alleviating clogging of constructed wetlands, and is especially suitable for constructed wetlands that have begun to clog or have been clogged. This dissolution method belongs to one of the methods for relieving blockage of constructed wetlands in situ, which has no harmful effect on wetlands and can even promote the increase of enzyme and microbial activities in wetlands. technical background [0002] Constructed wetlands are widely used in the fields of domestic sewage treatment, industrial wastewater purification and ecological restoration of polluted water bodies, and belong to an energy-saving and environmentally friendly ecological engineering technology. Constructed wetland microorganisms can secrete extracellular polymeric substances (Extracellular Polymeric Substances, EPS). EPS has the property of adsorbing and adhering to organic and inorganic pa...

Claims

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Application Information

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IPC IPC(8): C02F3/32C02F3/34
CPCC02F3/32C02F3/34C02F3/342Y02A40/22Y02W10/10
Inventor 吴振斌杜明普徐栋武俊梅张义贺锋周巧红
Owner INST OF AQUATIC LIFE ACAD SINICA
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