Contaminated sediment ecological covering blanket and application method for inhibiting recovery and growth of provenance algae

Abstract

The invention provides a polluted sediment ecological coverage carpet capable of inhibiting original algae from revival and growth and an application method thereof, belonging to the field of sediment in-situ restoration and algae control of a eutrophied water body. The invention aims to solve the problems of ecological potential safety hazards, low restoration efficiency, incapability of reutilization and the like in the existing sediment coverage technique. The ecological coverage carpet comprises a thin fiber inverted filter layer, a biological-matrix combined restoration layer, a fabric layer, a quick connection hook, an embedded matrix frame, floaters, stay piles, a microcurrent electrolyzer, solar panels and electrodes. The application method comprises the following steps: analyzing the varieties of algae hypopuses and pollutants in the superficial deposit, selecting the restoration region, laying in the dormancy interval that blue algae do not revive to the water body, analyzing the pollutant content and adsorption characteristics of the adsorptive filter material in the embedded matrix frame, and determining whether to replace the filler or reap the plants. The carpet can be used in sediment improvement and ecological restoration in lakes, ponds, landscape water and other polluted water bodies.

Description

technical field [0001] The invention relates to the fields of in-situ restoration of sediment in eutrophic water bodies and algae control, in particular to an ecological covering blanket of polluted sediment for inhibiting the recovery and growth of provenance algae and an application method thereof. Background technique [0002] Water eutrophication is an important water environment problem that exists widely in my country and even in the world. The key to eliminating lake eutrophication is to reduce the nitrogen and phosphorus in lake water and the organic carbon and nitrogen and phosphorus loads in sediment. With my country's strict control of pollution discharge and the strengthening of water quality management, the input of exogenous nitrogen, phosphorus, heavy metals and other pollutants has been gradually controlled. As the most important reservoir of water pollutants, the sediment is enriched with a large number of pollutants, such as heavy metals, nutrients such as ...

AI Technical Summary

Problems solved by technology

It is mainly covered with laterite materials, and such as activated iron oxide and activated alumina (Chinese patent application number CN200510028579.3) are added in an appropriate proportion to control the release of nutrients from the sediment, such as the modified clay proposed by Pan Gang et al. technology (Chinese Patent Application No. CN200310113305.5; Chinese Patent Application No. CN200510063410.1) and the method of using clayey soil to realize algae-grass conversion in shallow water lakes (Chinese Patent Application No. CN201010104186.7), to a certain extent, improved underwater anaerobic environment, which reduces the release of phosphorus from sediments, and has a certain inhibitory effect on the recovery of cyanobacteria in spring and summer outbreaks; Sun Yanli et al. also proposed a blanket system for controlling the release of sediment pollutants (China Patent Publication No. CN202284288U); In addition, Yang Hao et al. propose the method and equipment (Chinese Patent Application No. 200810244179.X) for removing cyanobacteria during the dormancy period of cyanobacteria, and prove that reducing the amount of cyanobacteria during the dormancy period can slow down the outbreak of cyanobacteria blooms, but the The method greatly disturbs the microbial and benthos communities on the water-mud interface, and does not mention how to improve anaerobic sediment and ecological restoration

[0005] The above-mentioned technologies or inventions related to algae control and sediment remediation through in-situ sediment coverage have the following problems: First, after covering the surface sediments with materials such as local soil or clay minerals in a large area, a stable The "covering film" absorbs and fixes nutrients and at the same time isolates the biological community in the original sediment at the bottom of the water body, especially the benthic animal community has a great destructive effect, and there is an ecological security risk; secondly, the above-mentioned covering After the material is fully adsorbed, there is still a certain risk of release through the action of water body erosion, etc., and the pollutants cannot be completely removed from the water body, and the dormant algae or algae existing in the surface sediment cannot be killed only by sediment coverage. Algae cells still have the possibility of recovery; finally, adding a large amount of covering materials will reduce the depth of the water body and change the slope of the lake bottom, so it cannot be used in shallow water or waters with certain requirements for water depth

[0006] In summary, the current traditional sediment remediation technology still has great defects. It is difficult to solve the current complex sediment pollution problem by using only a single remediation method. The advantages of various in-situ remediation technologies should be fully utilized, and multiple integrated In order to achieve more efficient and thorough restoration effect

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