A kind of sediment in-situ repair particle and its preparation method, use method and application

Abstract

The invention discloses a bottom mud in-situ repair granule and its preparation method, use method and application. ~4 parts by weight, 1-1.5 parts by weight of ferrous sulfate, and 0.5-1.5 parts by weight of bentonite. It specifically includes the following steps, S1: preparing a polyvinyl alcohol solution; S2: weighing and mixing the raw materials evenly; S3: drying the prepared restoration particles and storing them in a desiccator. The dosage of restoration particles is calculated according to the surface area of ​​the sediment, which is 300-600 grams of restoration agent per square meter of sediment, and the action period is 30 days to 120 days. The invention reduces the influence of alkaline substances in the oxygen-releasing agent on the metabolism of microorganisms, improves the utilization efficiency of peroxides; converts the refractory organic matter in the bottom mud into an intermediate product that is more easily used by microorganisms, improves the COD removal rate of the bottom mud, and can inhibit the bottom mud The release of nitrogen and phosphorus realizes the in-situ remediation of the contaminated sediment of the surface water body.

Description

technical field [0001] The invention relates to the technical field of bottom mud restoration in water environment, specifically, a kind of bottom mud in-situ restoration particle and its preparation method, use method and application. Background technique [0002] The bottom sediment of a water body is the product of urban development and evolution, and the bottom mud maintains the exchange of matter and energy with the overlying water at all times. Moreover, the bottom mud is also the place where benthic animals and microorganisms live, and the substrate for the growth of aquatic plants. As an important link in the material and energy cycle in the water ecosystem, the sediment also plays a certain role in improving the quality of the overlying water. Pollutants discharged into the surface water body will undergo microbial degradation, chemical reaction, and physical adsorption in the sediment to reduce the pollution level of the surface water body, reduce the pollutant lo...

AI Technical Summary

Problems solved by technology

[0005] The limitations of the in-situ covering method of sediment: the covering technology can control the water quality well, but the pollutants remain in the sediment; this method will cause potential damage to the water environment and benthic environment where the organisms exist; the excavation of the bottom organisms in the sediment Activities can damage cover materials, causing release of pollutants

[0007] Limitations of phytoremediation: phytoremediation is affected by the environment and climate, with slow growth and long treatment cycle; sites with high pollutant content will inhibit the growth of plants and limit its treatment of pollutants; in phytoremediation, it may be possible to pass Food chains, material cycles, etc., re-enter the natural environment; phytoremediation is not suitable for restoring river water bodies with shipping functions

[0008] In-situ reoxygenation has limitations: reoxygenation of the overlying water on the sediment can only oxidize the surface layer of the sediment; when the river water is deep and the water flow is large, the utilization rate of the enriched oxygen is low

And when the oxygen release rate of the oxygen release agent is too slow, the local repair will be incomplete due to insufficient oxygen supply, and the repair efficiency will be reduced.

Images