Volume No. 3 Issue No.: 2 Page No.: 427-436 Oct-Dec 2008




Anju Singh and Richa Gautam*

Industrial Safety and Environmental Management, National Institute of Industrial Engineering (NITIE), Vihar Lake Road, Mumbai-400 087, (INDIA)


Received on : May 16, 2008




Pesticide wastewater contains toxic and inhibitory compounds, which adversely affect biological growth. Another major challenge with these effluents is high total dissolved solids (TDS), thereby making maintenance of an active bacterial population in bioreactors difficult. An additional problem is the wide variation in ingredients making up the composite stream because of product and schedule demands. Consequently maintaining a steady state in reactor performance is a challenging task. This paper is concerned with exploring the role of nutrients and bioaugmentation towards maintaining steady state reactor performance with the observed odds and maintenance of the active biomass. Isoproturon is a phenyl urea herbicide, the production of which generates effluent with high COD. A continuous activated sludge reactor of 5 L capacity was started with sludge from the ASP of a leading pesticide manufacturing industry as seed. Successful treatment (91% COD reduction) of such a stream was achieved using bioaugmentation techniques. The initial biomass in the reactor was systematically augmented with a special culture for 1 month. Regular monitoring and biomass addition further stabilized the bacterial population. The reactor consistently gave high COD reduction (80-90%) during its operation.


Keywords : ASP, Isoproturon, Bioaugmentation, Pesticide, Effluent, COD, Shake flask studies