A method for strengthening and fixing endogenous phosphorus in eutrophic water sediment

Abstract

The invention provides a method for reinforcing and fixing endogenous phosphorus on eutrophic water body bottom mud. The method comprises the following steps that 1, water purification plant sludge is filtered with an iron screen, dried, crushed and then sieved by a 100-mesh sieve to obtain treated water purification plant sludge; 2, anhydrous calcium chloride powder sieved by the 100-mesh sieve is doped into the treated water purification plant sludge, and the materials are mixed to be uniform by a stirrer to obtain a mixed material; 3, the mixed material is fired to obtain an endogenous phosphorus curing material; 4, the endogenous phosphorus curing material is tiled on a surface layer of the remediated eutrophic water body bottom mud; 5, corbicula fluminea is introduced; 6, the endogenous phosphorus curing material is uniformly laid on the surface layer of the remediated eutrophic water body bottom mud again, and then the step of reinforcing and fixing the endogenous phosphorus on the eutrophic water body bottom mud is completed. According to the method, the bottom mud interior microenvironment can be changed, a space and a state in which anaerobism and aerobism alternatively exist are formed, and mutual transformation between the endogenous phosphorus forms is reinforced.

Description

technical field [0001] The invention belongs to the technical field of environmental treatment, and in particular relates to a method for strengthening and fixing endogenous phosphorus in eutrophic water body sediment. Background technique [0002] Phosphorus is a limiting factor for the growth of phytoplankton, especially for the growth of algae, which require a large amount of phosphorus. For those water bodies that have basically cut off exogenous phosphorus, the supply of endogenous phosphorus in the sediment to the overlying water has become the main source. Therefore, how to control the release of endogenous phosphorus has attracted much attention. The control methods of endogenous phosphorus release mainly include covering method and sediment dredging. The former is to physically isolate the water body from the sediment by using certain materials; the latter is to directly dredge the sediment of the water body, that is, to directly remove the pollution source of the...

AI Technical Summary

Problems solved by technology

[0007] Technical problem to be solved: Aiming at the disadvantages that the existing covering method leads to the exacerbation of the anaerobic state inside the bottom mud and the inability to strengthen the form transformation of endogenous phosphorus, the present invention provides a method for strengthening and fixing the endogenous phosphorus in the bottom mud of eutrophic water bodies. The prepared solidified material can gradually transfer the solidified material to the depth of the sediment by using the destructive effect on the surface of the sediment when the river clam is active, thus providing a method for effectively controlling the release of endogenous phosphorus