METHOD FOR TREATING WASTEWATER USING GREEN ALGAE AND WATER FLEA

摘要

PURPOSE: A method for treating wastewater using green algae and water flea is provided. The method is characterized in that nitrogen and phosphorus are removed by green algae, and green algae are removed by water flea continuously. Therefore nitrogen and phosphorus removal is operated efficiently. Water flea is used as feed. CONSTITUTION: The method comprises two steps: dilution of wastewater and injecting green algae, water flea, and inorganic materials. Wastewater is diluted until nitrogen concentration being 100 to 150 ppm. Green algae are one of Chlorella sp., Selenastrum capricornutum, and Chlamydomonas sp. Quantity of injecting green algae are 5x10¬5 to 1x10¬6 population/mL wastewater. Water flea is one of Moina macrocopa and Daphnia sp. Quantity of injecting water flea is 20-30 population/L wastewater. Inorganic material is at least one of Mg2¬+, Ca2¬+ and phosphorus. Each concentration of inorganic materials is as follow: Mg2¬+ is 300-500 ppm; Ca2¬+ is 100-150 ppm; and phosphorus is 1/12-1/10 of nitrogen concentration.