Published in Scientific Bulletin. Series F. Biotechnologies, Vol. XX
Written by Roxana Gh. MANEA, Ioan I. ARDELEAN
In this paper there are presented experiments aiming to investigate the nutrient removal, either from the influent or from efluent of a wastewater treatment plant. The time of contact was 7 days. In order to determine the ratio volume of water – algal biomass we increased the volume of water and the retention time to 4 days. In the study photosynthetic micro-organisms were used, either free or immobilized, aiming to put them to work for consuming the nutrients. In relation mass / volume of 10 grams wet weight of free photosynthetic micro-organisms in 1,000 milliliters input water, removal efficiency of total nitrogen was 15% on the first day, 29% on the second day and 33% on day 4, while total phosphorus removal efficiency was 31% in the first day, 57% on second day and 80% on day 4. In relation mass / volume of 10 grams wet weight of free photosynthetic micro-organisms in 1,000 milliliters effluent water, removal efficiency of total nitrogen was 40% on the first day, 66% on day 2 and 79% on day 4, while the removal efficiency of total phosphorus was 22% on day 1,50% on day 2 and 67% on day 4. Experiments with photosynthetic microorganisms immobilized in an artisanal cage showed greater efficiency of removing nutrients (nitrate decreased by 70% and phosphorus by 50%) compared to experiments with free photosynthetic micro-organisms (nitrate was removed by 64% and total phosphorus by 39%) subjected to the same experimental conditions.
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