| dc.description.abstract | Coagulation and Flocculation process is used to remove colloidal particles and fine
suspended materials from drinking water. Aluminium Sulphate /Alum is the most
commonly used and widely available inorganic coagulants in the water treatment
plants in Sri Lanka. But due to reduction of pH value, high sludge handling cost,
presence of residual Aluminium and slow floc formation, alternative coagulants for
the coagulation process become required. The efficiency of iron-based coagulants
such as Ferric Chloride and Ferric Sulphate was compared to that of alum in this
study. For this study, Kandana Water Treatment Plant was selected and raw water
was taken from the Kalu Ganga. The quality of the treated water was analysed by
conducting standard jar test and compared with alum. Raw and treated water
samples were tested for turbidity, alkalinity, pH and colour. The main goal of this
research was to use iron-based coagulants to improve the coagulation and
flocculation process at Kandana Water Treatment Plant. According to the results
obtained from the study, Ferric Chloride showed the highest turbidity reduction
effectiveness. The combination of alum and ferric chloride (50 %+ 50 %) showed
the best colour removal efficiency. The floc sizes generated with both Ferric Chloride
and Ferric Sulphate, were greater than those with Alum. | en_US |
