Contaminated water body bottom mud reoxygenation type repairing agent, preparation method and applications thereof

Abstract

The present invention provides a contaminated water body bottom mud reoxygenation type repairing agent, a preparation method and applications thereof. The contaminated water body bottom mud reoxygenation type repairing agent is prepared by mixing calcium peroxide, active carbon and polyvinyl alcohol according to a certain ratio, wherein oxygen can be persistently, stably and slowly released through the repairing agent. The repairing agent is directly poured to the surface of bottom mud, and the surface layer of the bottom mud is gradually changed into an aerobic state from an anaerobic state along with long time and effective oxygen release so as to promote aerobic microbial growth and metabolism, strengthen a pollutant degradation process, control releases of nutrients such as N and P in the bottom mud, and reduce a eutrophication degree of the water body, such that the water body is gradually restored to a benign ecological environment. In addition, an oxidation-reduction electric potential of the surface layer of the bottom mud is improved, and the pH value of the surface layer of the bottom mud is correspondingly changed, such that a precipitation rate of heavy metals in the bottom mud is significantly reduced, and contamination on the overlying water body is reduced.

Description

technical field

[0001] The invention relates to the field of water environment restoration, in particular to a re-oxygenation type restoration agent for sediment in polluted water bodies and its preparation method and application. Background technique

[0002] Water body sediment pollution is a worldwide environmental problem. Pollutants enter the water body through atmospheric deposition, sewage discharge, rainwater leaching and scouring, and finally deposit in the bottom mud and gradually enrich. After the exogenous pollution is effectively controlled, the pollutants in the sediment may still cause "secondary pollution" to the water body. The U.S. EPA pointed out in a survey report in 1998 that in the 2,100 fish consumption incidents that have occurred in the United States, it has been repeatedly confirmed that the pollution comes from the bottom mud. With the process of urbanization and industrial development in China, the problem of sediment pollution has become increa...

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