Potential method to improve the treatment efficiency of persistent contaminants in industrial wastewater
Michele R Silva1, Maria A Z Coelho, Magali C Cammarota
1Departamento de Engenharia Bioquímica, Escola de Química, Universidade Federal do Rio de Janeiro, Centro de Tecnologia, Bl.E, Sl.203, 21949-900 Rio de Janeiro, Brazil.
Abstract:
The objective of this work was to evaluate a potential method for improving the treatment efficiency of persistent contaminants in industrial wastewater. Adsorption with powdered activated carbon (PAC) was applied as pre-treatment and operational conditions as pH, temperature, carbon concentration and time were investigated in laboratory scale for different streams generated in a fine chemical industry. Chemical oxygen demand (COD) removal efficiencies of 63 and 50% were attained for two important industrial streams, Product C after acid treatment and precipitation and Influent, at pH 7, room temperature and with 5 and 15 g l(-1) of PAC, respectively. Biodegradation assays showed that PAC adsorption enhanced COD removal efficiency. PAC pre-treatment increased the COD removal of Product C after production stream from 15 to 80% and improved the biodegradability of the Influent stream by 50%.
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