MICROALGAE GROWTH INHIBITION ANALYSIS IN THE NITROGEN AND PHOSPHORUS ADSORBENT (NPA)-TREATED WATER

초록

This study aimed to reduce the occurrence of algal blooms by decreasing nitrogen and phosphorus elution leaked from livestock manure sprayed on farmland in dams and river basins. Excessive algal growth affects water availability by disturbing the aquatic ecosystem, clogging filters of the water intake tower, generating toxins, and causing social and economic losses. Nutrients discharged from nonpoint pollution sources (farmlands and barns) often flow into rivers without being purified, thus contaminating nearby river basins. An analysis of algal growth characteristics by dividing rainfall runoff into raw solution, nitrogen and phosphorus adsorbent (NPA) compost, and general compost affected growth rate and microalgae biomass production as well as nitrogen and phosphorus removal rates. Blue-green algae ( Microcystis aeruginosa) ) and green algae ( Scenedesmus acutus) ) were diluted, and the effect of reduction of microalgae growth was studied in all experiments. Results of water quality analysis reveal that eco-friendly compost has the effect of reducing nutrient salts in rainfall runoff by 30%-40% compared to general compost. Furthermore, the growth of blue-green algae and green algae can be reduced if the effluent of eco-friendly compost flows into the river and the nutrient concentration is lowered.

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