Efficiency of Chlorella minutissima microalgae in the treatment of swine-waste enriched with urea
2004
João Bosco Rozas Rodrigues | Paulo Belli Filho
The increasing process of pig breeding and the lack of adequate technologies to treat the residue originating from this activity in Brazil has been causing considerable environmental degradation and a threat to water resources. The utilization of microalgae to treat rural farming residue has been widely used in several countries with success. This presents many advantages, such as reducing polluting agents and providing a high biological and economic value of the produced algal biomass. The present work was developed with the microalgae Chlorella minutissima, with the objective of testing the process on a medium scale, under semi-controlled conditions, verifying the effect of urea addition and the pH control. The effects of these treatments on algal growth efficiency and on the capaciy to remove polluting agents were observed experimentally. The results showed that the growth efficiency of the microalgae Chlorella minutissima, cultivated in residues 20cm deep at a cod concentration of 280mg/L was not influenced by added urea or pH control. The use of these algae in a mixed culture (algae and bacteria) reduced the COD, turbidity, total solids, volatile total solids, total suspended solids, ammnonia, orthophosphate and total phosphate.
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