Shahid Beheshti University Advanced Environmental Sciences 3115-7173 5 1 2007 09 23 Study of Capability of Zebra Mussel (Dreissena polymorpha) in Reduction of Nitrate and Phosphate in Urban Waste Water (Open System) Study of Capability of Zebra Mussel (Dreissena polymorpha) in Reduction of Nitrate and Phosphate in Urban Waste Water (Open System) 94216 FA Leyli Gholamhosseini Department of Environment, Faculty of Environment and Energy, Science & Research Campus, Islamic Azad University Arash Javanshir Department of Environment Faculty of Natural Research, Tehran University Amirhesam Hassani Department of Environment, Faculty of Environment and Energy, Science & Research Campus, Islamic Azad University Journal Article 2015 05 17 Dreissenapolymorpha (Zebra mussel) is a fresh water mollusk and native species of Caspian Sea area. These shells belong to filter feeder class and are able to filter a great volume of water. In this research, due to a wide range of materials available in urban wastewater efficiency of Dreissena polymorpha is studied to reduce concentration of Nitrate and Phosphate. The shell masses in 20, 40 and 60 g were put test for filtration tests and indirect absorption of nitrate and phosphate from artificial wastewater. These tests were performed in open system and were repeated 3-10 times depending on variance range.The results showed that there is a positive correlation between the weight of shell masses and the filtration rate of Nitrate and Phosphate in open system (R2 =0.99) and there is a negative correlation between concentration of Nitrate and Phosphate at the wastewater entry on one side and the filtration rate of nitrate and phosphate on the other side (R2=0.97) (t=2.132, P<0.023). It was found that when the weight of shell masses increase (from 20 to 40 to 60 g), the amount of Nitrate absorption is 0.08-0.2 mg.l-1 while Phosphate is absorbed 0.02-0.04 mg.l-1 in the open system. In this research it was found that Chlorella and Scenedesmus algae are able to reduce concentration of Nitrate (of at least 0.03 to 1.73 mg.l-1) and the Phosphate solved in waste water (of at least 0.42 to 4.48 mg.l-1). Dreissenapolymorpha (Zebra mussel) is a fresh water mollusk and native species of Caspian Sea area. These shells belong to filter feeder class and are able to filter a great volume of water. In this research, due to a wide range of materials available in urban wastewater efficiency of Dreissena polymorpha is studied to reduce concentration of Nitrate and Phosphate. The shell masses in 20, 40 and 60 g were put test for filtration tests and indirect absorption of nitrate and phosphate from artificial wastewater. These tests were performed in open system and were repeated 3-10 times depending on variance range.The results showed that there is a positive correlation between the weight of shell masses and the filtration rate of Nitrate and Phosphate in open system (R2 =0.99) and there is a negative correlation between concentration of Nitrate and Phosphate at the wastewater entry on one side and the filtration rate of nitrate and phosphate on the other side (R2=0.97) (t=2.132, P<0.023). It was found that when the weight of shell masses increase (from 20 to 40 to 60 g), the amount of Nitrate absorption is 0.08-0.2 mg.l-1 while Phosphate is absorbed 0.02-0.04 mg.l-1 in the open system. In this research it was found that Chlorella and Scenedesmus algae are able to reduce concentration of Nitrate (of at least 0.03 to 1.73 mg.l-1) and the Phosphate solved in waste water (of at least 0.42 to 4.48 mg.l-1).

https://envs.sbu.ac.ir/article_94216_5fff84383a30541c85e7606b0ec48b36.pdf