A method for improving the transparency of eutrophic water body

Abstract

The invention provides a method for increasing transparency degree of a eutrophic water body. The method comprises the following steps of (1) selecting a target water body; (2) feeding filter-feedingaristichthysnobilis into the target water body; (3) when the biological amount of blue-green algae group with particle size greater than 50mum is smaller than 30% of total biological amount of blue-green algae, feeding minerals into the target water body, so as to convert the blue-green algae into green algae. The method has the characteristics that the problems of high outbreak degree of the blue-green algae in the eutrophic water body, low transparency degree of the water body and the like are solved, and the purposes of attenuating the blue-green algae group, converting the blue-green algaephase into the green algae phase, and obviously increasing the transparency degree of the water body are realized; the method is safe, the cost is low, and the like.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a method for improving the transparency of eutrophic water bodies. Background technique [0002] At present, the outbreak of cyanobacterial blooms in lakes and other water bodies in China is a common phenomenon. The control measures of cyanobacterial blooms are usually chemical, physical and biological methods. The chemical method is mainly to control algal blooms by spreading chemical agents or flocculants. Secondary pollution. The physical method is mainly through manual salvage and mechanical algae removal, which is time-consuming and labor-intensive and difficult to remove continuously. Fish feeding mainly uses silver carp and bighead fish to directly control algae. Although the number of algae populations has decreased, the algal biomass of single cells or small groups often does not decrease. When the silver carp and bighead carp breeding den...

AI Technical Summary

Problems solved by technology

[0002] At present, the outbreak of cyanobacteria blooms in lakes and other water bodies in China is a common phenomenon. The consequences are reduced water transparency, water quality deterioration, and serious damage to ecosystems.

The control measures of cyanobacteria bloom are commonly used chemical, physical and biological methods. The chemical method is mainly to control the algae bloom by spreading chemical agents or flocculants. Secondary pollution

Physical methods mainly use manual salvage and mechanical algae removal, which is time-consuming and labor-intensive and difficult to remove continuously

Fish stocking mainly uses silver carp and bighead carp to directly control algae. Although the number of algae populations has decreased, the biomass of single-cell or small-scale algae often has not decreased. When the breeding density of silver carp and bighead carp is high, it will also cause negative effects such as an increase in the concentration of ammonia nitrogen in the water body. influences

Therefore, the algae control method of silver carp and bighead carp is effective in some water bodies with better water quality, such as Qiandao Lake, etc., but the effect is not significant in lakes with severe cyanobacteria outbreaks

Freshwater shellfish are also used to control algae. Although they can filter out single-cell or small-scale cyanobacteria, because cyanobacteria lack the essential nutrients for shellfish growth, they cannot meet the needs of shellfish growth and development. Long-term ingestion of cyanobacteria will cause shellfish Growth inhibition and even death (Park et al., 2002; Basenet al., 2011)

Moreover, the formation of cyanobacterial populations also has an impact on shellfish filter feeding, such as freshwater shellfish Anodonta anatina Reduced filter-feeding and increased pseudocone production when feeding on M. aeruginosa colonies (Bonteset al., 2007)

Submerged plants inhibit cyanobacteria from three aspects: nutrient competition, inhibition of sediment suspension and release of algastatin, but the recovery of aquatic plants requires many prerequisites, and submerged plants are not easy to survive when the conditions are immature