A method for preventing and controlling phytoplankton algal blooms in slow-flowing water based on hydrodynamic forces

Abstract

The invention discloses a method for preventing and controlling floating algae bloom in a slow flow water body based on hydrodynamic force. Diversified flow fields are formed through a hydraulic circulation system and stone group arrangement based on response of different algae to the water flow velocity, the water flow speed and the flow field of the slow-flow or static water body are changed, and the water flow environment of the planktonic algae is promoted to change frequently; the community structure of the planktonic algae in the water body is regulated and controlled according to the ecological habit of the planktonic algae and the corresponding mechanism of the water flow velocity based on the moderate interference theory so that the dominant community of the planktonic algae cannot grow and reproduce for a long time in a proper hydrodynamic environment, the bloom potential of the planktonic algae in the water is controlled, and the purpose of harmlessly controlling the bloom of the planktonic algae is effectively achieved. The method is applied to the technical field of ecological environmental protection.

Description

technical field [0001] The invention relates to the technical field of ecology and environmental protection, in particular to a method for preventing and controlling planktonic algae blooms in slow-flowing water bodies based on hydrodynamic forces. Background technique [0002] The main reason for the formation of black and odorous water bodies is that a large amount of nitrogen, phosphorus, and organic matter enter slow-flowing or still water bodies, resulting in anoxic and anaerobic water bodies, black and smelly water bodies, and alienation of ecological service functions. The treatment of black and odorous water bodies is very easy to cause large-scale cyanobacteria, green algae, euglena, etc. The outbreak of planktonic algae and even the formation of algal blooms will consume a large amount of dissolved oxygen in the water body after the death of the algae, resulting in repeated black and odorous water bodies. Insufficient control of external sources will cause repeated...

AI Technical Summary

Problems solved by technology

The treatment of black and odorous water bodies is very easy to cause large-scale cyanobacteria, green algae, euglena, etc. The outbreak of planktonic algae and even the formation of algal blooms will consume a large amount of dissolved oxygen in the water body after the death of the algae, resulting in repeated black and odorous water bodies. Insufficient control of external sources will cause repeated recurrences, which will seriously affect the treatment and ecological restoration of black and odorous water bodies, and reduce the ecological landscape of the water body.

However, most of the current control methods for algae blooms are emergency measures, which are only effective in the short term and difficult to achieve the expected results. Some even destroy the chemical balance of the water body by using algicides, coagulants, etc. May exacerbate ecosystem degradation and even lead to ecological destruction

In addition, it is difficult to achieve the prevention and control effect in a short period of time by feeding on phytoplankton algae through filter-feeding fish or zooplankton, whether using classical biological manipulation or non-classical biological manipulation to rebuild the food chain of the ecosystem, or by investing a large amount of daphnia ( Commonly known as algae-eating insects) and other zooplankton emergency control, can not achieve long-term effect

[0003] CN103214096A invented a method for controlling algae blooms based on the biological chain relationship, using the principles of predation and mutual growth and mutual restraint between organisms to construct the control method for algae blooms. hard to work

[0004] CN107265646A provides a method for controlling the outbreak of cyanobacteria blooms in urban landscape water bodies. It inhibits the growth of planktonic algae through nutrient competition and allelopathic effects. In deeper areas, submerged plants are in a disadvantageous competitive position compared to planktonic algae. In extreme weather such as heavy rainfall and improper operation and maintenance, the entire system is prone to collapse

This method cannot be applied to river water bodies with narrow water surface, and it is an emergency measure for phytoplankton algae blooms

CN108409047A provides a method for systematically controlling the rapid proliferation of cyanobacteria cells in lakes in spring, and the coordinated application of physical, biological and chemical treatment measures; CN105621546A discloses a method for controlling cyanobacteria blooms. By adding carbon elements and lye, both belong to emergency Treatment measures, and prone to repeated algal blooms

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