In situ remediation method for improving black and odorous river sediment by combining submerged plants and improving agents

Abstract

The invention discloses an in situ remediation method for improving black and odorous river sediment by combining submerged plants and improving agents. The method includes the following steps: putting a sediment improving agent in the sediment of a river, and planting submerged plants in the sediment on the 0th - 20th day when the sediment improving agent is put, wherein 1.5-2 kg of the sedimentimproving agent can be put into the sediment per square meter, and the submerged plants are one or more of potamogeton crispus, ceratophyllum demersum and myriophyllum verticillatum; harvesting the submerged plants when the heights of the submerged plants arrive the water surface of the river so that the tops of the submerged plants can be located 25-35 cm below the water surface; and repeating the step 3 until the color of the sediment is changed from dark brown to brown-yellow. The method combines a chemical remediation technology and a bioremediation technology, so that the deficiency of the chemical remediation technology and the bioremediation technology can be made up by integrating the advantages of the two. Black and odorous rivers can rapidly improve the oxygen environments of thesediment by adding the sediment improving agent, so that favorable conditions can be created for the planting of the submerged plants.

Description

technical field [0001] The invention belongs to the technical field of comprehensive treatment of river polluted water bodies, and in particular relates to an in-situ restoration method for improving black and odorous river sediment by combining submerged plants and improving agents. Background technique [0002] With the rapid development of the economy, a large amount of pollutants produced by people in production and life are discharged into the river. When it exceeds the self-purification capacity of the river, the water quality will deteriorate and black odor will appear. Black and odorous water is an extreme form of organic pollution in water. The mechanism of most black and odorous water bodies is basically the same. It is caused by the lack of oxygen content in the water body, which leads to the reduction of the redox potential of the water body and the corruption of organic matter. When pollutants are discharged into the water body, the pollutants consume a large a...

AI Technical Summary

Problems solved by technology

For black and odorous rivers, the nutrient content in the water body is too high, the oxidation-reduction potential is too low, and the transparency is poor, which affects its lighting conditions. It is basically not suitable for the growth of submerged plants. Therefore, only using submerged plants to repair black and odorous river sediments Feasibility is not high, repair effect is not ideal

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