Effects of Pond Partition on Characteristics of Algae and Water Quality in Pond Located at High Latitudes

Abstract

Characteristics of algae and water quality were studied at a pond located in high latitudes. Domestic and industrial wastewaters discharged are treated through different type stabilization ponds made by enclosing a part of the pond to remove BOD₅, COD_cr and nutrients. Effects of the pond partition on the dominance species of algae and water quality were studied.
During the cold term (-20°C--5°C), Cryptomonas, Chlamydomonas and Euglena were dominance species in the pond. While Euglena, which may be grown by uptaking organic material was the dominance one in the stabilization pond, and its population increased in falling temperature. It plays an important role for removal of BOD₅ and COD_cr. On the other hand, during the warm term (15°C-30°C), dominance species were Cyclotella, Chlorella and Microcystis in the pond and Scenedesmus oblignus in facultative ponds of the stabilization ponds. Microcystis and Scenedesmus obliqnus would uptake NH₄⁺-N truly. Removal of NH₄⁺-N and PO₄^3--P depends on the concentration of Chl.a. The relationship between NH₄⁺-N and PO₄^3--P removal and the concentrations of Chl.a was obtained.