Filter Performance Evaluation of Karangpilang III Drinking Water Treatment Plant PDAM Surya Sembada Surabaya Bowo Djoko Marsono (a*), Aliza Camellia (a)
a*) Departement of Environmental Engineering, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia
bowodjok[at]enviro.its.ac.id
Abstract
Due to uprating, decreasing quality of effluent filter and unstable backwash frequency on its unit filter per day result in the volatility of Karangpilang III water production quantity and quality. Two evaluations were conducted to determine the performance of the unit filter and its backwash process. Parameter used in the evaluation is turbidity. The first evaluation showed that (1) the turbidity of all unit has complied to the national regulation. However, five units were found to not comply the criteria from PDAM- (2) the ratio of backwash volume and water production indicated that the performance of filter number 5-10 were normal with percentage between 3-7%- (3) only five units have fulfilled UFRV criteria being within the range of 300-500 m3/m2. Further assessment on filter number 2 and 10 were conducted using filter coring method. The loss of media, unstratified media, cracking, and air binging were seen on filter number 2 and 10. Based on the post-backwash turbidity value profile, removal and effluent turbidity of filter number 2 were found to be better than filter number 10. Floc retention filter profile of filter number 10 showed different conditions in each sampling depth from 3 sampling points.
