Total phenols as pollution indicator of sewage and sewage contaminated canal

Total phenol concentration was examined in Hyderabad city sewage, before and after addition of sewage to Fuleli canal and river Indus-Total phenol was observed within the ranges 0.23-2.5 mg/L in sewage, below detection limits to 0.95 mg/L at Fuleli canal and below detection limit to 0.08mg/L at river Indus at Kotri barrage. The variation of phenol contents with water discharge and seasons at river Indus and Fuleli canal were also investigated and inverse relation of concentration of phenol with water discharge was observed. The concentration of phenols in sewage and Fuleli canal exceeded the permissible limits for sewage and surface water respectively-