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Performance of digester decant system with biological filter followed by constructed wetland and solar reactor in the treatment of domestic sewage

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Author(s): Glícia Pinto Barra Reinaldo | Rafael Oliveira Batista | Paulo Cesar Moura da Silva | Luis Cesar de Aquino Lemos Filho | Miguel Ferreira Neto | Delfran Batista dos Santos

Journal: Ambiente e Água : An Interdisciplinary Journal of Applied Science
ISSN 1980-993X

Volume: 7;
Issue: 2;
Start page: 62;
Date: 2012;
Original page

Keywords: sustainability | sanitation | wastewater

ABSTRACT
This study aimed to analyze the performance of digester decant system with biological filter followed by constructed wetland and solar reactor in the treatment of domestic sewage from Milagres rural community in Apodi-RN. The treatment system was monitored for the period of October and November 2010, 48 days after planting Pennisetum purpureum Schumach. Samples of domestic sewage were collected at different stages of treatment, in four replications on time, to determine physicochemical and microbiological characteristics about the system performance. The results indicated significant removal of turbidity, biochemical oxygen demand, chemical oxygen demand, total solids, suspended solids, phosphorus and oil and grease using the set digester decant with biological filter, followed by constructed wetland and solar reactor; the association of average solar radiation of 28.73 MJ m-2 d-1, effluent depth of 0.10 m on reactor and time of sun exposure of 12 hours provided removal of fecal coliform up to 99.99% of domestic sewage in Apodi, RN, the treated effluent met microbiological standard of the Brazilian guidelines for agricultural use with restrictions.

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