Perancangan Unit Instalasi Pengolahan Air Minum Kampus Institut Teknologi Sepuluh Nopember

Abstract

According to its masterplan, ITS with the total academicians of nearly 25,000 people, have the water demands of 17 L/s, while the rainfall intensity around this university which have total area of 187 ha is 2,065 mm per year. Therefore, ITS have the potential to utilize rainfall in order to supply it’s own water demand. In order to meet the water demand independently and reduce the water demand budgets, therefore the design of water treatment plant in ITS is needed. There are two aspect that will be reviewed in this design, which are technical and financial aspect. In the preliminary research, raw water that comes from rainwater runoff has water quality of 2. The water treatment plant planned to be built in the location with total area 1,927 m2 in Jalan Teknik Mesin ITS and there are 3 water treatment unit will be established in that place. While the location of reservoir has total area of 4.458 m2 and has depth around 4-5 m, where it is located at 442 m from the water treatment plant. Utilization of reservoir only 50% from it’s capacity. The reason of this matter is because reservoir also utilize as the entertainment area and supporting facility for ITS student’s activity. The construction of ITS water treatment plant will be done in 3 steps. The first step has water capacity of 6.5 L/s. Water treatment plant in ITS consist of intake, coagulation, flocculation, sedimentation, filtration, disinfection, reservoir and pump house. Based on financial calculation, construction of ITS water treatment plant is Rp1,736,606,095 pond and O&M cost is Rp 1,976/m3. This financial calculation show that this design is cheaper compare to water supply cost of PDAM Surabaya, therefore it can reduce the cost of water supply in this campus. Unfortunately, utilization of pond and drainage that function as the reservoir of rainwater runoff iv that can be used as the raw water, in the existing condition not able to provide ITS water demand. Therefore, there is a need to have more review regarding drainage system and water pond in ITS.