Method and device for treating cyanobacteria in water area based on biological competition principle

Patent metadata

Field	Value
Publication number	US-11933010-B2
Application number	US-201917273425-A
Country	US
Kind code	B2
Filing date	Mar 28, 2019
Priority date	Sep 13, 2018
Publication date	Mar 19, 2024
Grant date	Mar 19, 2024

Abstract

The invention discloses a method and a device for treating cyanobacteria in a water area based on the principle of biological competition, the method comprising: finding an area where cyanobacteria most easily accumulate, i.e. a concave bank of a water area, and setting up an algae interception net around the area; quickly and largely clearing the cyanobacteria in the area by means of manual or mechanical catching; planting emerged plants on the shoreline of the water area to fundamentally improve water quality; and additionally, densely arranging treatment tanks in a larger water area to kill the cyanobacteria gradually, and collecting dead cyanobacteria to prevent them from polluting the water area subsequently; and collecting and treating the tanks regularly for recycling.

First claim

What is claimed is:

1. A method for treating cyanobacteria in a water area based on the principle of biological competition, comprising the following steps of:
I: selecting a catching location ( 1 ) at an edge of the water area, digging a sedimentation pond ( 2 ) on a shoreline, and extracting cyanobacteria from the catching location ( 1 ) to the sedimentation pond ( 2 );
II: setting up an algae interception net ( 3 ) around the catching location ( 1 ) on the surface of the water area;
III: planting emerged plants ( 4 ) at a concave bank of the water area.

2. The method according to claim 1 , wherein: the step I further comprises the following sub-steps of:
I-1: finding the concave bank of the water area according to hydrological data;
I-2: selecting sampling locations at predetermined intervals along the concave bank of the water area and collecting water samples at the sampling locations;
I-3: monitoring and analyzing water flow, regular wind direction, cyanobacteria density, at each sampling location, and setting up catching locations on the shoreline based on accumulation of cyanobacteria.

3. The method according to claim 2 , wherein: a railing ( 7 ) for intercepting treatment tanks ( 5 ) is horizontally placed on the surface of the water area, so that the treatment tanks ( 5 ) are allowed to stay in a certain area of the water area.

4. The method according to claim 3 , wherein:
a closable gap ( 8 ) is provided on the railing ( 7 ), and driven by a water flow, the treatment tanks ( 5 ) can sequentially pass through the gap ( 8 ) and enter the catching area surrounded by the algae intercepting net ( 3 ) to be treated centrally.

5. The method according to claim 4 , wherein:
an annular support floating ring ( 9 ) is provided around the treatment tank ( 5 ).

6. The method according to claim 5 , wherein the inner diameter of the gap ( 8 ) is larger than the outer diameter of the support floating ring ( 9 ).

7. The method according to claim 4 , wherein:
when the treatment tank ( 5 ) passes through the gap ( 8 ), algae inlet channels ( 6 ) on the tank ( 5 ) are closed.

8. The method according to claim 7 , wherein: the cyanobacteria in the treatment tanks ( 5 ) recovered in the catching area are emptied into the sedimentation pond ( 2 ), and then the treatment tanks ( 5 ) are put back upstream of the catching location ( 1 ).

9. The method according to claim 2 , wherein there are a plurality of the catching locations.

10. The method according to claim 1 , wherein:
treatment tanks ( 5 ) are arranged to be suspended in the waters upstream of the catching location ( 1 ), and at least a part of each tank ( 5 ) is exposed above the water surface;
algae inlet channels ( 6 ) for cyanobacteria are provided on a side wall of each treatment tank ( 5 ) close to the water surface, and the side wall below the algae inlet channels ( 6 ) is sealed.

11. The method according to claim 10 , wherein a top of each treatment tank ( 5 ) is disposed to be open and aquatic plants are planted in the tanks ( 5 ).

12. The method according to claim 1 , wherein: the aquatic emerged plants are an aquatic local dominant species.

Assignees

• Univ Fudan

Inventors

• Zheng Zheng
• Zhang Weizhen
• Gu Peng
• Luo Xingzhang
• He Jian

Classifications

• E02B3/00 Primary

  Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites (barrages or weirs E02B7/00); Sealings or joints for engineering works in general · CPC title

• C12M33/22

  Settling tanks; Sedimentation by gravity (settling tanks per se B01D21/02) · CPC title

• C12M47/02

  Separating microorganisms from the culture medium; Concentration of biomass (separating microorganisms from their culture media C12N1/02) · CPC title

• E02B8/023

  Arresting devices for waterborne materials (E02B1/003 takes precedence; in artificial watercourses E02B5/085; arresting oil or the like E02B15/08; sieving devices for waste water purification C02F; in sewers E03F5/14) · CPC title

• E02B15/04

  Devices for cleaning or keeping clear the surface of open water from oil or like floating materials by separating or removing these materials ({stopping water-borne material in artificial water canals E02B5/085; stopping water-borne material at barrages or weirs E02B8/023}; other treatment of water, waste water or sewage C02F; materials for treating liquid pollutants, e.g. oil, gasoline, fat, C09K3/32 {; separation of oil in sewage conduits E03F5/16}) · CPC title