Changes of Water Quality and Characteristics of Nutrients Release During the Algal Extinction
The experiments of algal extinction and decomposition were conducted to indicate the effects of algal extinction and decomposition on the water quality of lakes and nutrients in water using fresh algae suspension collected in the pron algal bloom area of Chaohu Lake.Meanwhile,the changes of the physical and chemical indicators of water quality including dissolved oxygen(DO),oxidation reduction potential(ORP),electrical conductivity(EC),total nitrogen(TN),total phosphorus(TP),and ammonia nitrogen(NH3-N)were explored simultaneously.The results indicated that the process of cyanobacteria dying out and decomposing led to a rapid decline of DO and ORP in a short period of time,and minimum value dropped to 0.1 mg/L and-200 mV,so that the water body was at an anaerobic and strong reduction state.The algae decomposition process accelerated the release of nutrients into the water body,resulting in the continuous increase of nitrogen and phosphorus nutrient concentrations.The maximum concentrations of TN,NH3-N and TP were 2.15,1.18 and 2.60 times of that of the initial water.In addition,significant negative correlation between the concentrations of nutrients and cyanobacteria biomass in the process of cyanobacteria dying out and decomposing revealed that quickly salvaging cyanobacteria in bloom area is indispensable and effectively to hold back further expansion of cyanobacterial blooms.
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