POWER CONSUMPTION IN A MINERALIZATION OF DIRECT RED 23 AZO DYE IN A SEQUENCING BATCH REACTOR
Sustainable process-product development & green chemistry
Environmental Engineering & Management (T1-3P)
Keywords: batch reactor, RD23 AZO DYE, remotion, evaluation
The objective of this work is to study the consumption power in the start–up of an anaerobic/aerobic sequencing batch pilot reactor (SBR an/ae) for the mineralization of the direct red 23 (RD23) azo dye. The reactor was packed with granular activated carbon as carrier medium of the biomass. A mixture 50/50 of activated sludge from two treatment plants: one of municipal wastewater and another of industrial wastewater were used like inoculums. It was used synthetic wastewater with 25 mg/L RD23 as substrate, 50 mg/L acetic acid as co-substrate and medium mineral nutrient. For the acclimatization of the biomass to the RD23 and to the changes of environmental anaerobic/aerobic, the reactor was used the strategy of fixed efficiencies, that consisted in to allow to the biomass the necessary time to reach 80% for the removal of RD23, the biotransformation to amines aromatic during the anaerobic phase, and the thermodynamic evaluation. In the aerobic process the removal of biotransformated amines was of 80% and upper. The parameters determinates were pH, temperature, oxide potential redox (ORP), RD23, total alkalinity as CaCO3, DQOc, total amines, sulphates, sulfides and nitrogen as N-NH4 and N-NO3.
The reactor was powered 253 cycles. The acclimatization was reached in the cycle 27 with an initial concentration of 25 mg/L of RD23. When the biomass was acclimated the time of reaction was reduce from 72 hours to only 24. The concentration of load organic was determined as DQOc. When the biomass was acclimatized to the RD23 the removal efficiency of DQO was stayed between 75 and 80%.
The performance of reactor was leaded like an acidogenic reactor. The presence of biogas was not detected. The concentrations of RD23 was continuous increasing to 50 mg/L during the cycles 28 to 57 and to 75 mg/L during the cycles 58 to 81 with a global removal efficiency of 90%. A nitrogen balance was made and it was observed a stage of desnitrification and nitrification during the process. The pH average was of 7 units in the anaerobic phase and of 8 units in the aerobic phase. The reactor pilot of expanded bed SBR anaerobic/aerobic was evaluated for the treatment of the RD23 azo dye.
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Presented Monday 17, 13:30 to 15:00, in session Environmental Engineering & Management (T1-3P).
