Abstract
This study evaluated the removal of nitrogen and organic matter in a membrane bioreactor system operating in a condition of simultaneous nitrification and denitrification controlled by intermittent aeration. A submerged-membrane system in a bioreactor was used in a pilot scale to treat domestic wastewater. The dissolved oxygen concentration was maintained between 0.5 and 0.8 mg L-1. The concentration of the mixed liquor suspended solids (MLSS) in the system ranged from 1 to 6 g L-1. The system efficiency was evaluated by the removal efficiency of organic matter, quantified by Chemical Oxygen Demand (COD), Biochemical Oxygen Demand (BOD5) and Total Organic Carbon (TOC). Nitrogen removal was assessed by quantifying Total Kjeldahl Nitrogen (TKN) and ammonia nitrogen. During the system start-up, the removal efficiencies of COD and NTK were around 90% and 80%, respectively. After the simultaneous nitrification and denitrification (SND) conditions were established, the removal efficiencies of COD and NTK were 70% and 99%, respectively. These results showed that sewage treatment with the membrane bioreactor (MBR) system, operating with simultaneous nitrification and denitrification conditions, was able to remove organic matter and promote nitrification and denitrification in a single reactor, producing a high-quality permeate.
Highlights
This study evaluated the removal of nitrogen and organic matter in a membrane bioreactor system operating in a condition of simultaneous nitrification and denitrification
The system efficiency was evaluated by the removal efficiency of organic matter, quantified by Chemical Oxygen Demand (COD), Biochemical Oxygen Demand (BOD5) and Total Organic Carbon (TOC)
Nitrogen removal was assessed by quantifying Total Kjeldahl Nitrogen (TKN) and ammonia nitrogen
Summary
O uso de tratamentos biológicos em conjunto com processos de separação por membranas, Biorreatores com Membranas (BRM), aplicados ao tratamento de esgoto doméstico é uma alternativa eficiente e economicamente viável para fornecer efluentes de excelente qualidade (Hoinkis et al, 2012; Subtil et al, 2013; 2014). Observa-se a expansão da publicação de estudos recentes em tratamento de águas residuárias utilizando BRM com foco direcionado para remoção de nutrientes, como nitrogênio (Rodríguez-Hernández et al, 2014; Ding et al, 2013; Khan et al, 2013; Lin et al, 2013; Yao et al, 2013). Desnitrificantes, a remoção total de nitrogênio em estações de tratamento de esgoto convencionais é comumente atingida em sistemas com dois estágios ou em reatores sequenciais em batelada, nos quais a nitrificação e desnitrificação são atingidas por separação temporal. O entendimento dos mecanismos envolvidos no processo de nitrificação e desnitrificação simultânea precisam ser melhor compreendidos para que os sistemas de tratamentos por BMR operando em condição de NDS sejam otimizados. O presente estudo objetivou avaliar a remoção de matéria orgânica e nitrogênio por NDS de esgoto doméstico por sistema de BRM
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
