Shala Moradianfard, Jalal Ghorbani, Parviz Reisi, Norouz Mohtashami Nasab
In water treatment plants the finding of ways that meanwhile effective efficiency decreasing the coagulant substances consumption, has a great importance and is considered to engineering economy consideration. This applicable analytical study was conducted in lab scale of hormozgan water treatment by jar test on 108 samles. To choice of (PACL, recycled sludge, PACL plus recycled sludge) for turbidity removal, an examination was done at different sludge volume (from 5 to 45ml/L) and different turbidities (from 11to 98 NTU). At the end of any jar test, with the counting of samples, s remained turbidity and coliform the efficiency of this factors elimination was determined by covariance and Duncan analysis (Pvalue< %1). Results showed that the maximum turbidity and coliform removal efficiency were recovered to 97.12% and 91.35% respectively, that was obtained at 10ppm PACL plus 10ml/L recycled sludge, but optimum dose was Pertinent to 8ppm PACL plus 10ml/L recycled sludge with PH 7.5 that of efficiencies, resulted 96.81% and 91.23%, also do not significant difference between this two doses. By using the optimal dose of recycled settled sludge in this treatment plant, %20 reduction of PACL consumption was obtained equivalent to 192.3 kg per day as parsimony that is remarkable.
