Silver carp and cladophora united algae control method

Abstract

The present invention relates to a method of cooperative control of alga in a water body comprising silver carp and cladophora, which relates to a water treatment method and solves the problem of that the usage of chemical agent for removing alga is harmful to human health, the usage of microstrainer and the flotation removal of algae have high cost, the ozone, ultraviolet or laser treatment for removing alga has a limited scale, and the common waaterrthacinth for removing alga causes ecological damage. In the present invention, silver carp is cultured in eutrophication water body with a culturing density of 60~100 g/m<3> and a single weight of 60~200 g; a floating net cage is arranged in the eutrophication water body, which is an open net cage made from stainless wire net having an aperture of 3~7 mm, wherein nylon wire nets having an aperture of 1.2~1.8 cm is arranged inside of the net cage which are parallel with each other and are vertical with the bottom of the net cage, besides, the four corners of the upper bottom of the floating net cage are provided with floater, by which the side walls of the floating net cage can overtop the water level by 0.2~0.5 m; the distance between the adjacent two net cages is 10~15 times of the length or width of the net cage; if cladophora grows on the nylon wire, the cladophora is collected. The present invention can reduce the alga content and the trophic level in raw water of water plant effectively and can greatly improve the water quality.

Description

technical field [0001] The invention relates to a water treatment method, in particular to a method for jointly controlling algae, nitrogen and phosphorus nutrition levels in eutrophic raw water of water plants by using two kinds of freshwater aquatic organisms. Background technique [0002] Eutrophication of water body is a water body effect caused by excessive input of nutrients such as nitrogen and phosphorus. It is mainly manifested in the excessive growth of algae in water, accompanied by a series of changes in water quality and water ecology, resulting in a decrease in water transparency and deterioration of water quality. Eutrophication of raw water has greatly affected the normal production of waterworks. The existing algae removal methods in water treatment mainly include: dosing chemical agents to remove algae, microfiltration to remove algae, air flotation to remove algae, microorganisms to remove algae, etc. Although the application of chemical algae removal is ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for combined algae control of silver carp and Clado algae, which can solve the problem of endangering human health by using chemical agents to remove algae; the problems of complicated operation and high cost by using microfilter and air flotation to remove algae; Algae killing methods such as ozone, ultraviolet light or laser have the problems of large equipment investment, high cost, and limited treatment scale, and the problem of biological invasion caused by planting water hyacinths and other aquatic plants will cause new damage to the ecology.