Freshwater lake ecological alga control method

Abstract

The invention discloses a freshwater lake ecological alga control method which comprises the following steps: (1) setting up a net fencing region; (2) setting up an isolation region, wherein emergent aquatic plants are transplanted in the isolation region and the transplanting density is 4 to 6 plants per square meter; (3) putting in filter feeding fishes, wherein the ratio of the filter feeding fishes to omnivorous fishes is 2:1. The method disclosed by the invention is simple and easy to operate, has strong maneuverability, has no secondary pollution and prevents algal bloom by mixed culture of the filter feeding and omnivorous fishes; fragments, alga, zooplankter and the like in each layer of a water body are caught; alga content is reduced; the water body environment is more completely purified; the emergent aquatic plants are convenient to adsorb N and P and reduce the eutrophication degree of the water body; in addition, xenocypris davidi bleeker and plagiognathops microlepis are naturally bred without being put in every year, density control is implemented in a harvesting manner of catching big fishes and leaving small fishes in the later period, the operation cost is reduced, and caught fishes also can bring certain additional economic benefits.

Description

technical field [0001] The invention belongs to the technical field of environmental ecological engineering, and in particular relates to an ecological algae control method for freshwater lakes. Background technique [0002] With the increasing impact of human activities on water ecosystems, cyanobacterial blooms have become a sign of eutrophic water bodies around the world, resulting in deterioration of water quality, damage to the structure and function of ecosystems, and the production of toxins, especially in eutrophic water bodies. The rapid proliferation of algae caused by trophication has brought great troubles to drinking water, increased water treatment costs, made it difficult to guarantee the quality of effluent water, and brought great harm to humans and aquatic animals. [0003] In view of the severe eutrophication of water bodies, countries around the world have launched various algae removal methods. There are chemical methods that use strong oxidants and alg...

AI Technical Summary

Problems solved by technology

[0002]With the increasing impact of human activities on water ecosystems, cyanobacterial blooms have become a sign of eutrophic water bodies around the world, resulting in deterioration of water quality and ecosystem damage. The structure and function are destroyed, and toxins are produced at the same time, especially the rapid proliferation of algae caused by eutrophication of the water body, which brings great trouble to drinking water, increases the cost of water treatment, and makes it difficult to guarantee the quality of effluent water. cause great harm to aquatic animals

[0003]Aiming at severe eutrophication of water bodies, various countries around the world have developed various algae removal methods, including chemical methods that use strong oxidants and algicides as algae removal methods. Adding medicaments achieves the purpose of algae removal, but in the process of algae removal, by-products harmful to the human body may be produced, especially the use of oxidants causes the algae to burst and lead to the release of intracellular toxins; the physical and chemical methods represented by air flotation, This method uses methods such as air flotation, membrane filtration, and ultrasonic algae removal. Although no by-products are produced, the operation is complicated and the operating cost is high; some biological methods are used to control algae and algae removal, usually by feeding silver carp, bighead carp and other fish and Using large shellfish to control the occurrence of cyanobacterial blooms is widely used at present, but there are certain problems: the commonly used silver carp and silver carp are mostly silver carp and silver carp, and silver carp and silver carp cannot control themselves in lakes. For breeding, silver carp and silver carp that are artificially propagated and cultivated in ponds need to be put into the lake every year. The operating cost is relatively high, which is not conducive to long-term circulation operation; large-scale shellfish have a strong drainage effect from the outlet holes and have a greater impact on the bottom of the water body. The large stirring effect makes the N and P deposited in the bottom silt disturbed and enters the water body, which is not conducive to the reduction of the N and P content in the water body, resulting in poor algae control effect