WASTEWATER TREATMENT IN RECYCLING SYSTEM USING ANAEROBIC ANOXIC REACTOR FOLLOWED BY AEROBIC REACTOR WITH SUPPORT

Abstract

The techniques of wastewater treatment are widely used consists in the use of anaerobic and aerobic systems operating individually, however, these technologies have disadvantages that need to be adjusted. Systems combined anaerobic aerobic appear as viable alternative, because, can gather the advantages of both technologies and promote significant removal of organic material and nutrients. Thus, this study aimed to treat wastewater in anaerobic aerobic combined system, seeking to produce effluent with low concentrations of organic matter and nutrients, as well as investigating the potential of biomass production in both systems, estimating the mass balance of the load organic and nitrogen applied. The experimental investigation consisted of a combined monitoring system: Anaerobic Anoxic Reactor followed by Aerated Reactor with immobilized submerged Support Means in the recirculation system. The combined system efficiently removed expressed in COD organic matter (92%), SST (93%), total nitrogen (92%) and final effluent produced with average concentrations of nitrite and nitrate below 1 mg L-1. However, the removal of phosphorus was considered unsatisfactory, as there was in the sludge disposal system. The results of the mass balance demonstrated the possibility of determination of removed organic and nitrogen fractions. Keywords: Combined system; immobilized support means; mass balance