A method for in situ treatment of river and lake sediment

Abstract

The invention relates to an ecological engineering technology for disposing river or lake bottom mud on site to construct an ecological revetment. River or lake bottom mud in the urban region and particle components are filled into ecological bags to be used for constructing the ecological embankment on a cement hardened river or lake bank, mixtures of bottom mud and other components are filled between the ecological bags and the original bank zone, then, plants such as bushwood and sedge with high purifying capacity are planted, and thus a system for disposing bottom mud on site is constructed. With the method, river or lake bottom mud suffering urban pollution is disposed on site, transportation cost is reduced, influences on the environment are reduced, and the bottom mud is disposed in an ecological harmless mode and recycled through a constructed compound system of bottom mud matrixes, plants and microorganisms. The formed near natural plant ecological zone can intercept and absorb surface source pollutants carried into a river or lake by surface runoffs, and pollution level is reduced.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and particularly relates to a method for on-site treatment of river and lake bottom mud. Background technique [0002] With the rapid development of the economy and the continuous expansion of the city scale, the pollution of rivers and lakes is becoming more and more serious. Due to farmland reclamation, vegetation destruction and other reasons in the basin, soil erosion has intensified. In order to maintain the clear water landscape, the city has built dams and other facilities, resulting in the accelerated accumulation of sediments in rivers and lakes, affecting ecological security issues such as urban water storage and flood control. Therefore, the treatment of sediments with a large amount of pollutants accumulated in river and lake areas in urban areas has become an urgent problem for the current government and society. A large amount of organic matter debris, toxic and r...

AI Technical Summary

Problems solved by technology

Although dredging can effectively solve the pollution situation of rivers, since the dredged sediment still needs to be followed up, excavating corresponding waste pits for landfill, transportation and excavation costs also increase the cost of sediment dredging; and A large number of pollutants contained in the sediment will also enter the soil to cause secondary pollution and form new environmental problems

There are also many descriptions of river and lake sediment treatment methods in existing patents, such as a method of using modified zeolite to control the release of phosphorus from sediment in situ (CN103408209A), an integrated test device for river and lake dredging and sludge dehydration and drying And method (CN103408207A), multi-stage water quality ecological purification system suitable for shallow and narrow mixed water channels (CN103351084A), treatment system and treatment process for removing polluted sediment from rivers in central urban areas (CN103334469A), contaminated sediment treatment device (CN203307188U) However, most of them are limited to changing the physical and chemical properties of the sediment by physical and chemical methods, ignoring the combined effect of biology and ecology, and all need to be treated in different places, which invisibly increases the cost of transportation

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