A method for establishing a threshold value of cyanobacteria density to ensure the safety of water sources

Abstract

The invention discloses a blue-green algae density threshold establishment method for guaranteeing the safety of a water source. The method includes the steps that the density and metabolites of blue-green algae of the target water source are monitored, the stage before water bloom of blue-green algae, the stage of water bloom of blue-green algae and the stage after water bloom of blue-green algae of the water source are distinguished, correlation analysis is performed on the densities and the metabolites of blue-green algae in the three stages, the types of the significantly correlated metabolites are selected, and linear regression equations for the densities and the metabolites of blue-green algae in the three stages are established; according to the limits of specific metabolites regulated by the hygienic standard for drinking water, the limits of the densities of blue-green algae corresponding to different metabolites are obtained through linear regression equation projection, and according to the minimum tolerance principle, the minimum values of the limits of the densities of blue-green algae are taken to determine the threshold of the density of blue-green algae in the water source. According to the method, influences of environmental factors on the yield of blue-green algae metabolites of unit cells are comprehensively considered, influences of growth of blue-green algae in the water source on drinking water are exactly reflected, and the threshold of the density of blue-green algae is regional and unique.

Description

technical field [0001] The invention relates to a water source safety evaluation method, in particular to a method for determining a threshold value of cyanobacteria density in a water source to ensure drinking water safety, including a method for establishing a safety limit value and a maximum allowable value of cyanobacteria density in a water source. Background technique [0002] my country's surface water is seriously polluted, and the problem of eutrophication in lakes and reservoirs is prominent. Among the 26 nationally controlled key lakes (reservoirs), 76.9% of them are inferior to surface III water quality standards, and cyanobacteria blooms (or blooms formed by other algae ) has become a major ecological disaster plaguing the water supply of many cities. At present, 98% of tap water production in my country still adopts the traditional process of flocculation-sedimentation-filtration-disinfection, which cannot cope with the water supply safety problems caused by cya...

AI Technical Summary

Problems solved by technology

In previous studies, the warning limit of cyanobacteria biomass in drinking water was deduced from the guiding limit of algal toxins in drinking water, but the dynamic change process of metabolite formation during the growth process of different densities of cyanobacteria under the comprehensive action of environmental factors was not considered, nor was the cyanobacteria and its metabolism in the tap water production process considered. The impact of the product on the effluent water quality, so the proposed alarm limit for cyanobacterial biomass lacks guidance and practicality

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