Phototrophic microorganisms biomass production with joint utilization of city surface water

Today surface water especially rain and thaw water became one of the environmental challenges for the cities. Those waters can be contaminated by different impurities including organics, oil products, heavy metals and etc. Utilization and reusing of those types surface water is the point of interest of many city agglomerations. In this paper preliminary results of Euglena gracilis CCAP 1224/5Z cultivation at highly organic contaminated surface water are presented. Cultivation was provided at illumination from 500 - 1200 lux depending on natural illumination in Moscow region. It was shown that during experiments that total organic carbon (TOC) content decreased from 41 mg/l to 15 mg/l in five days cultivation period. Final biomass concentration in case of cultivation on waste water exceeded concentration in the control flasks. Also the lipids content has been determined. In the biomass from flasks with surface water lipids content was from 24% to 32% to dry weight, depending on illumination and ambient temperature. Control biomass contains approximately from 28% to 30% in all experiments. Experiments with low TOC close to 10 mg/l showing close results - decreasing of TOC approximately at 50-60% in all flasks. Thereby it was demonstrated that it is possible in Moscow climate conditions during spring - autumn period to apply phototrophic microorganism E. gracilis strain for surface water treatment and in this case total lipids content a stay the same as in control cultivations.