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Theoretic estimation method of algae derived loading for lakes |
YANG Su-wen, JIN Wei-dong, YAN Yu-hong, WANG Sheng-rui |
State Key Laboratory of Environmental Criteria and Risk Assessment, State Environmental Protection Key Laboratory for Lake Pollution Control, Research Center of Lake Eco-environment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China |
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Abstract Water quality index such as CODCr, CODMn, TP, and TN were selected to characterize theory algae derived loading, extracellular loading,and algae derived intracellular loading to set up estimation method system of algae derived loading under the simulation of two temperatures and 3 nutrition levels conditions. Results showed that average ATP of 5species kept increasing with nutrition level rising. Meanwhile the theory algae derived TN loading ATN was basically negative. ACODCr and ACODMn kept increasing withnutrition level rising. Algae derived extracellular TP loading ETP, extracellular TN loading ETN, extracellular CODCr loading ECODCr, and extracellular CODMn loading ECODMn kept dropping with nutrition level rising. Algae derived intracellular TP loading BTP, extracellular TN loading BTN, extracellular CODCr loading BCODCr, and extracellular CODMn loading BCODMn kept increasing withnutrition level rising. Results showed that theory algae derived loading was correlation with algae density significantly. Contribution to water quality of TP and COD loading waslarger. It was in the range of 0.2~3.7 times. That of TN was negative. The percentage of declining was in the range of 26%~58%. During the process of algae growth the "extra" loading of the total amount of system material was produced. It was an important reason for the water quality indicators, especially the increase of COD. This estimation method would be an important scientific basis on waterbloom control and quantitative reduction of eutrophication lakes.
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Received: 31 March 2016
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