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In a power supply (PLTU) located in West Sumatera Barat, water is massively utilized for boiler feed, chiller fire fighters, service water, and drinking water. This need is supplied by a river nearby as the only source. This raw water is subject to a pre-treatment unit to remove the contaminants.This research was aimed to design a raw water pre treatment unit for utility in the power supply and to compare with the existing and operating treatment unit. The feed flow rate is 1,160 m3/hour. The design objective was to remove TSS pathogenic bacteria, and turbidity using coagulation, flocculation, sedimentation, disinfectant, and ultra filtration membrane. Static miter was used with pipe diameter I6 in. Flocculator has tubular size of (2x2) m3 with t00 m length. Clarifier was a horizontal flow type with surface of (40x20) m2 and depth 5,8 m. This clarifier has surface loading flow rate of 35 m3/m2 .d weir loading 250 m?/m.a' with weir length of 111,4 m. Ultra-filtration membrane treats only 30% of feed water (50 lmh flux) and need surface area of 13,290 m2. From the comparison we found that we do not the screening. Furthermore, we should modify the flocculator and clarifier, and replace the sand filtration unit with ulrraqiltration membrane. |
