Grass carp, cladophora and daphnia hyaline multi-organism cooperated algae control method

Abstract

The present invention relates to a method of cooperative control of alga in a water body comprising grass carp, cladophora and daphnia hyaline, which relates to a water treatment method and solves the problem of high operating cost and much of the by-products of the current alga control method. In the present invention grass carp is cultured in eutrophication water body with a culturing density of 20~100 g / m<3> and a single weight of 20~100 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 4~6 mm, 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 0.2~0.4 m. The present invention is simple and easy, and can reduce the alga content and the trophic level in raw water of water plant effectively so as to solve the problem of that the eutrophication high algae-laden raw water affects the conventional treatment in current water plant, to reduce the cost and improve the water quality. The present invention make the best of the food habit difference between grass carp and daphnia hyaline, and comparing with the prior art, the present invention is simple and easy, economy and shortcut, and has high efficiency and convenient operation.

Description

technical field

[0001] The invention relates to a water treatment method, in particular to a method for synergistically controlling algae content in eutrophic raw water of a water plant by using a variety 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 greatly affects the normal production of waterworks.

[0003] Among the existing algae removal methods, there are chemical methods using strong oxidants and algicides as algae removal methods, physical and chemical methods represented by air flotation, and physical methods such as microfiltration and membrane filtration. The common advantage of c...

Examples

specific Embodiment approach 1

[0005] Specific embodiment one: the method of this embodiment is: put grass carp in the eutrophic water body, the throwing amount of grass carp is 20~100g per cubic meter of water body, and the single tail weight of grass carp is 20~100g; Floating net cage, the opening net cage made of stainless steel wire mesh with an aperture of 4-6 mm, the length × width × height of the floating net cage is (1-2m) × (1-2m) × (1 ~2m), floaters are fixed at the four corners of the upper bottom of the floating net cage, so that the side wall of the floating net cage is 0.2~0.4m above the water surface, and two pieces of nylon with a hole diameter of 1~2cm parallel to the side wall and perpendicular to the upper and lower bottom are fixed inside the floating net cage Wire mesh, the left and right sides and the bottom of these two pieces of nylon mesh are sewed together with the side wall and the bottom of the floating cage respectively, and the space between the two pieces of nylon mesh and the ...

specific Embodiment approach 2

[0006] Specific embodiment two: the difference between this embodiment and the specific embodiment one is that the feeding amount of grass carp in eutrophic water body is 25~55g / m 3 . Other methods are the same as in the first embodiment.

specific Embodiment approach 3

[0007] Specific embodiment three: the difference between this embodiment and specific embodiment one is that the dosage of grass carp in eutrophic water body is 30~50g / m 3 . Other methods are the same as in the first embodiment.

technical field

[0001] The invention relates to a water treatment method, in particular to a method for synergistically controlling algae content in eutrophic raw water of a water plant by using a variety 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 greatly affects the normal production of waterworks.

[0003] Among the existing algae removal methods, there are chemical methods using strong oxidants and algicides as algae removal methods, physical and chemical methods represented by air flotation, and physical methods such as microfiltration and membrane filtration. The common advantage of c...

Examples

specific Embodiment approach 1

[0005] Specific embodiment one: the method of this embodiment is: put grass carp in the eutrophic water body, the throwing amount of grass carp is 20~100g per cubic meter of water body, and the single tail weight of grass carp is 20~100g; Floating net cage, the opening net cage made of stainless steel wire mesh with an aperture of 4-6 mm, the length × width × height of the floating net cage is (1-2m) × (1-2m) × (1 ~2m), floaters are fixed at the four corners of the upper bottom of the floating net cage, so that the side wall of the floating net cage is 0.2~0.4m above the water surface, and two pieces of nylon with a hole diameter of 1~2cm parallel to the side wall and perpendicular to the upper and lower bottom are fixed inside the floating net cage Wire mesh, the left and right sides and the bottom of these two pieces of nylon mesh are sewed together with the side wall and the bottom of the floating cage respectively, and the space between the two pieces of nylon mesh and the ...

specific Embodiment approach 2

[0006] Specific embodiment two: the difference between this embodiment and the specific embodiment one is that the feeding amount of grass carp in eutrophic water body is 25~55g / m 3 . Other methods are the same as in the first embodiment.

specific Embodiment approach 3

[0007] Specific embodiment three: the difference between this embodiment and specific embodiment one is that the dosage of grass carp in eutrophic water body is 30~50g / m 3 . Other methods are the same as in the first embodiment.