Remoção de macronutrientes de efluente da indústria de castanha de caju por uso de reator aeróbio em batelada com inóculo fúngico Removal of macronutrients from effluent of a cashew nut industry by using a batch aerobic reactor with fungal inoculums

• Main Authors: Marina Santos da Silva Lopes, Patrícia Celestino Carvalho de Oliveira, Marcus Vinícius Freire Andrade, Rinaldo dos Santos Araújo, Glória Marinho, Kelly Rodrigues
• Format: Article
• Language: English
• Published: Brazilian Association of Sanitary and Environmental Engineering 2011-03-01
• Series: Engenharia Sanitaria e Ambiental
• Subjects: Aspergillus niger; batelada sequencial; fósforo; nitrogênio; sequential batch; phosphorus; nitrogen
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-41522011000100005

Foi estudada a eficiência da remoção de nitrogênio e fósforo do efluente de indústria de castanha de caju, por uso de reator aeróbio em batelada com inóculo de Aspergillus niger AN400. O reator recebeu 5 L de água residuária, acrescida de glicose, na concentração de 1 g.L-1 (Etapa I) e de 5 g.L-1 (Etapa II ). Cada etapa teve seis ciclos operacionais, cada um com tempo de reação total de sete dias. Os valores de pH dos efluentes na Etapa I variaram de 6,4 a 8,7 e na Etapa II , de 3,1 a 7,0. Durante a Etapa II , o reator alcançou bons resultados para remoção de nutrientes sem acúmulo de sua concentração no meio: 49% de fósforo total, 60% de ortofosfato, 79% de amônia, 78% de nitrato e 90% de nitrito, indicando que a menor liberação de nutrientes pelos micro-organismos ocorreu na presença de concentração elevada de glicose.<br>It was studied the removal efficiency of nitrogen and phosphorus from effluent of a cashew nut industry by using an aerobic reactor operated in repetitive batch, inoculated with Aspergillus niger AN400. The reactor was fed with 5 L of wastewater, supplemented with glucose in the concentration of 1 g.L-1 (Phase I) and 5 g.L-1 (Phase II ). Each phase had six operational cycles, with total reaction time of seven days per cycle. The pH values of the effluents in Phase I varied from 6.4 to 8.7 and in Phase II , it varied from 3.1 to 7.0. The reactor achieved good results of removal without nutrients accumulated in the medium, during Phase II : 49% to total phosphorus, 60% to orthophosphate, 79% to ammonia, 78% to nitrate, and 90% to nitrite, indicating that the lesser release of nutrients by microorganisms occurred in the presence of higher glucose concentration.