Untreated urban sewage mixed with industrial effluents were
collected from the five sampling stations i.e. Assi Ghat (AG),
Harishchandra Ghat (HG), Rajendra Prasad Ghat (RPG), Manikarnika Ghat (MG) and Raj Ghat (RG) along the 10 km stretch of the river Ganga at Varanasi (25˚18′N, 83˚1′E), India and brought to laboratory for experimental use. In order to minimize the error from each sampling station, 5 samples of wastewater have been collected separately and treated as 5 replicates. Batch experiments were configured during first week of August, September and October (2012) using the same wastewater samples collected in the same period.