Tratamento aeróbio de efluente sintético de laticínio usando reatores inoculados com fungos aspergilus niger an 400

Abstract

The dairy effluents are characterized by high concentration of organic matter in the form of carbohydrates, proteins and fats, which, if not removed properly, can cause serious environmental problems. To this end, this paper studied the removal of organic matter and nutrients from synthetic wastewater dairy provisions in the first phase in batch reactors and in the second phase, in continuous flow reactor and up. In the batch phase, the system was composed of two control reactors, two only inoculated with Aspergillus niger AN 400 and two inoculated with the same species and with the addition of sucrose, being PET and polyurethane the support for immobilization, in each type assembly. This step was performed in four periods of 7 days, totaling 28 days of operation. The reactor operated continuously for 106 days, inoculated with the fungus and filled with crushed PET as material support. The results of the batch showed efficiency on COD reduction, reaching a maximum of 71.7% and 64.8% for the RFe and RFP, respectively, in the 4th cycle, and a minimum of 23.4% and 20.4% for the RFP and RFSp the 2nd cycle. Removals achieved satisfactory as nitrate and orthophosphate, but in relation to ammonia, there was an increase in effluent concentrations of this variable. The treatment presented in streaming global removal of 75% for the COD at HRT of 8 h, some promising results regarding the removal of orthophosphate and ammonia, however, for nitrate, achieved average removal of 68%.