Method for relieving blockage of constructed wetland

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...

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 flooded for a long time, and the introduction of microbial agents is weak in competition with indigenous microorganisms in wetlands, etc.

[0007] (2) In-situ chemical deblocking technology is too harmful. Oxidants such as sodium hypochlorite can dissolve exopolysaccharides, but can kill wetland functional microorganisms and bacteria; the addition of acid and alkali will inevitably lead to changes in pH value, thereby significantly changing wetland system plants, Microbial living environment, destroying wetland system biofilm