Method for river channel restoration

Abstract

The invention provides a method for river channel restoration. The method comprises the following steps: (1) extracting 2 to 10 cm of sediment from the surface layer of river sediment; (2) placing a honeycomb-like filling material into the river sediment, wherein the upper end of the honeycomb-like filling material is 5 to 10 cm higher than the plane of the river sediment; (3) mixing the extractedsediment in the step (1) with calcium nitrate, a solid bio-stimulant, denitrifying bacteria, photosynthetic bacteria, ammonifying bacteria and nitrifying bacteria, and injecting an obtained mixture into the honeycomb-like filling material; and (4) planting submerged plants and elodea nuttallii which absorb ammonia nitrogen onto a river channel. The method for river channel restoration provided bythe invention combines microbial restoration and plant restoration, can significantly remove TOC and TN in the sediment, can maintain the physical and chemical properties of overlying water, increases the dissolved oxygen concentration of the overlying water, controls the TN concentration of the overlying water, and prevents eutrophication.

Description

technical field [0001] The invention belongs to the technical field of urban river pollution control, in particular to a river restoration method. Background technique [0002] The sources of water pollution can be divided into internal sources and external sources. In the process of treating polluted water bodies, in addition to cutting off or controlling external source pollution, the impact of internal source pollution cannot be ignored. After the pollutants enter the water body, they will eventually be deposited in the bottom mud through precipitation, adsorption and other ways and accumulate gradually. Due to continuous enrichment and accumulation, the concentration of pollutants such as nitrogen, phosphorus, oxygen-consuming organic matter, and refractory organic matter in the sediment of the polluted water body is often an order of magnitude multiple of the concentration of each pollutant in the overlying water. The production of ammonia nitrogen, hydrogen sulfide, v...

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Problems solved by technology

Jiang Hua used pulverized coal, oat stalks, fir, etc. as raw materials to make substrate carriers and added them to the river channel, and then added compound bacteria to repair the river channel sediment (application number 201310388670.0), realizing the resource utilization of waste. It will cause secondary pollution, but when adding complex bacteria, it is directly put into water, the impact and dilution of water flow will reduce the microorganisms on the carrier, resulting in a certain degree of waste

Yang Yang et al. used active porous ecological concrete to cover the surface of the bottom mud, and planted submerged plants on the covering layer to achieve in-situ continuous restoration of the bottom mud (application number 201510211531.X), but the active covering materials are zeolite and volcanic rock. , activated carbon, etc. The adsorption of pollutants in the sediment is mainly physical adsorption, which cannot completely remove the pollutants in the sediment, and the cost is relatively high

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