[Biological purification of saline chemical wastewater and variation of algological indicatiors].

Simulation pond experiment shows that from the entrance to the exit of the pond, the concentration of pollutants was decreased, while the species, diversity index and primary productivity of algae were gradually increased with increasing purification duration. The dominant algae species changed from high tolerance species to medium tolerant species. Algae quantity and chlorophyll-a concentration remarkably increased. Through 32 days, the purified water flowed out from the third grade pond. The relationships between algae quantity, biomass and chlorophyll-a concentration and the contents of BOD5, COD, NH3-N and PO4-P could be described with the second order equation. Temperature had an obvious effect on the algae growth and purification effectiveness. The optimum temperature condition for algae growth and wastewater purification was in the range of 20-25 degrees C.