STUDY ON ALGAE IN A SYNTHETIC BIOLOGICAL POND

The paper represents part of the results of a study on algae in a synthetic biological pond system(SBPS).Toxicity test on the alga Scenedesmus obliquus indicated that the wastewater was not toxic to algal growth but rather stimulated growth.A few malformed cells were observed in the cultures exposed to high concentrations(COD over 200mg/L)for 24h,indicating that mutagenic activity may be present in the water.AIgal growth potential in the wastewater was essentially the same as that of control. The photosynthetic production was significantly correlated with the water temperature. The bioproduction rates of water column a low and high water temperatures were 1.8—4.1 and 7—10 O2g/m2·d respectively.Stratification of metabolic process in the water column was notable. The ratio of algal biomass(fresh weight mg/L)to COD(ppm)was estimated to be 1:0.21 (±0.05).