Method for removing limnoperna lacustris from long-distance raw water conveying pipeline by using combined effect of sodium hypochlorite and water flushing

Abstract

The invention discloses a method for removing limnoperna lacustris from a long-distance raw water conveying pipeline by using the combined effect of sodium hypochlorite and water flushing, relating to a method for removing limnoperna lacustris from raw water conveying pipelines. The method comprises the following steps of continuously adding sodium hypochlorite to the long-distance raw water conveying pipeline for 5-11h, controlling the concentration of sodium hypochlorite in per liter of raw water to be 4-5mgL, and controlling the water flow velocity to be 0.8-3.5m / s, thereby completing the method for removing limnoperna lacustris from the raw water conveying pipeline through the combined effect of an oxidant and water flushing. According to the method, the advantages of sodium hypochlorite and water flushing in removal of limnoperna lacustris are integrated, sodium hypochlorite can dissolve byssus of limnoperna lacustris to enable the byssus to rapidly fall off, and water flushing can enable limnoperna lacustris to be rapidly removed from the water conveying pipeline, so that the dosage of medicaments is reduced. According to the method, the number of limnoperna lacustris in the raw water and the pipeline can be controlled effectively; by using the method, the operation is safe and convenient and has extremely high feasibility.

Description

technical field [0001] The invention relates to a method for removing freshwater shellfish in a raw water delivery pipeline, in particular to a method for removing freshwater shellfish in a long-distance raw water delivery pipeline through the combined action of sodium hypochlorite and hydraulic flushing. Background technique [0002] With the long-distance water transmission project put into use, the problems of biological invasion and fouling in the water transmission system have gradually become prominent. "Biofouling" refers to the invasion of a large number of attached organisms into water transfer structures and related production equipment, with a density as high as 10,000~100,000 / m 2 , causing fouling to the surface of the structure, corroding the structure, and even blocking the pipeline, affecting the normal operation of the project. The freshwater shellfish of the Mytilidae species growing in southern my country has caused serious biofouling in water pipelines. T...

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Problems solved by technology

[0004] In order to solve the existing problem of using oxidants to kill freshwater shell vegetables in raw water pipelines that may cause pipeline blockage caused by fresh water shell vegetables corpses, the present invention provides a combination of sodium hypochlorite and hydraulic flushing to remove fresh water shell vegetables in raw water water pipelines method, this method is suitable for the removal of freshwater shell vegetables in long-distance water pipelines in southern my country