Physicochemical characterization and treatment of domestic wastewater using bio-denitrification process

 

Y. Salama1,2, M. Mountadar2*, M. Rihani1, O. Assobhei1

1Laboratory of Marine Biotechnology and Environment (BIOMARE), Faculty of Science,

University Chouaib Doukkali, BP 20, 24000 El Jadida, Morocco

2Laboratory of Water and Environment, Faculty of Science, University Chouaib Doukkali, BP 20, 24000 El Jadida, Morocco

* Corresponding author. E-mail: mounta_dar@yahoo.fr

Received: 22 June 2012; revised version accepted: 20 September 2012

 

Abstract

     The water consumption increases at high speed under the effect of the demographic growth and the agricultural and industrial development. This water consumption involves a significant and increasing quantity of wastewater. These untreated rejections generally are poured in receiving environment (lake, river, sea, etc.), causing harmful effects on the environment. In this study, the biological treatment of raw sewage from the sewer in El Jadida city (Morocco) had been tested in laboratory by using a bioreactor (immerged bacterial bed) colonized by a heterotrophic denitrifying flora.

The obtained results show that parameters of removal efficiency were 97.69, 96, 90, 82.11 and 89.30 % of nitrate (NO3--N), dissolved chemical oxygen demand (COD), biochemical oxygen demand (BOD5), total phosphorus (TP-P) and total Kjeldahl nitrogen (TKN-N) respectively when the system was operated at optimal conditions; pH 8.4, temperature of 28.9 °C and COD/NO3--N ratio equal to 5. Consequently, the treated effluent has respected the norms defined in Moroccan’s project for all analyzed parameters.

 

Keywords: Domestic wastewater; Pollution; Biological treatment; Anaerobic reactor; Support media.

 

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