Evaluation of Coliform Removal by the Application of Induced Oxygen and Solar Reflectors

The study focused on the use of an integrated approach in enhancing facultative ponds for the treatment of sewage.Three single-cell ponds of various length-towidth were designed as a complete mix model, which receive induced oxygen and solar energy from a hydraulic flume and solar reflector.The three ponds were operated at a 10 days retention time.Settled sewage was allowed to flow through the individual ponds and samples were collected at three days intervals for laboratory analysis based on standard methods.The result showed that coliform removal efficiencies by the combined effect of induced oxygen and solar energy were 88%, 94% and 90% in ponds A, B, and C respectively.The solar reflectors only contributed 19%, 20% and 19% efficiencies in ponds A, B, C respectively, to the overall removal efficiency of total coliform.The experimental ponds A, B and C had coliform removal that ranges from 0.95 -1.13 log reduction.This study indicated that minimum solar dose is sufficient to bring about photocatalytic action; any advanced increment produces a corresponding effect on the disinfection efficiency.Hence these findings concluded that coliform bacteria seem to be negatively affected mostly by relatively high dissolved oxygen than by the additional intensity of incident light.