Physico-chemical characteristics Untreated water Treated water Tolerance limit#
Colour Dark yellow Light pale -                     
Odor Ammonical Reduced -
pH 8.1 7.5 5.5-9.0
Turbidity (NTU) 50 34 -
Total dissolved solids* 2389 1869 2100.0        
Total suspended solids* 346.0 179 200.0
Alkalinity (CaCO3) 273.0 138 -
Dissolved oxygen* 12 17 -
Biological oxygen demand* 36.0 14 30.0
Chemical oxygen demand* 280.0 64 250.0
Organic carbon˟ 180.0 129 -
Ammonical nitrogen˟ 58.0 43.7 50.0
˟Fe2+ 5.0 2.8 3.0
˟Cu2+ 6.0 2.5 3.0
˟Pb2+ 2.0 0.6 1.0
˟Ca2+ 249.52 84 75
˟Mg2+ 106.64 42.9 50
# Tolerance limits are listed according to the ISI Standards; *Values are in mgL-1 unit;
* Values are in ppm unit.

Table 1: Physico-chemical characteristics of sewage water before and after treatment with the bacterial consortium.