Judul: Evaluasi dan Desain Peningkatan Kapasitas Instalasi Pengolahan Air Minum di PT. Krakatau Tirta Industri
Abstrak: PT. Krakatau Tirta Industri (PT KTI) has a rule as supplier of Cilegon Municipality’s water needs. Considering the demand for water supply continues to grow, PT. KTI intends to increase its capacity up to 2500 liters/sec. This study aims to evaluate current condition of water treatment plant of PT. KTI, and to review the increasing of installation capacity by process and design aspects. The study is conducted in two stages, namely collecting primary and secondary data and analyzing process and design calculations. Water treatment plant at PT. KTI are bar screen, sand trap, coagulation, flocculation, sedimentation, filtration, and disinfection. Bar screen unit was designed with 40 pieces bar and width of 6 mm. Sand trap unit has minimum height of 4.30 m. Three pumps must have an efficiency of 90%. If the efficiency doesn’t reach that value, then the addition of at least one pump unit is needed. Coagulation unit design is carried out by hydraulic jump and mechanical mixing. Flocculation unit design is done by changing the impeller rotation to 32 rpm. On sedimentation units, plate settlers as much as 891 pieces is designed with inter-plate distance of 0.05 m and height of 1 m. Conclusions of this study are almost all units have parameters that don’t meet the design criteria, and design takes on the unit bar screen, and accelator.
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Judul: Evalusi Pemberian Dosis Koagulan Aluminium Sulfat Cair dan Bubuk Pada Sistem Dosing Koagulan di Instalasi Pengolahan Air Minum PT. Krakatau Tirta Industri
Abstrak: Surface water before being used for particular purposes must be processed first in order to be viable consumed. One of the worth attempts is by building a water treatment such as the installation of Water Treatment Plant that been practiced by PT. Krakatau Tirta Industri, Cilegon. One of the processes is coagulation using aluminium sulfate powder and liquid as the coagulant. This research purpose is to find the optimum dose of aluminium sulfate (liquid) at PT. KTI by comparing the quality and the production cost. The methods including several stages such as preparation phase, data collection, data processing and analysis and presentation of results. The optimum dose for powder using is 60 ppm and for liquid is 100 ppm. The production cost of aluminium sulfate (liquid) using wet alumina is Rp 6.491.838,36 and the cost of goods is Rp 1.131,17/ kg and for dry alumina the production cost is Rp 8.829.278,36 and the cost of goods is Rp 1.538,46/ kg the cost are cheaper than the aluminium sulfate powder cost of goods Rp 1.760/ kg. As resulted from the sensitivity test, the most sensitive variable from the cost of goods is sulfate acid for wet alumina and dry alumina for aluminium sulfate that using dry alumina as the raw material.
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Judul: Ornithonyssus Bursa (Berlese, 1888) Famili Macronyssidae yang Menyerang Unggas Dan Penaggulangannnya
Abstrak: Ornithonyssus bursa adalah tungau penghisap darah pada unggas di daerah tropis dan subtropis. Tungau ini relatif kecil, dengan panjang tubuh antara 700-1000 mikron dan lebarnya 250-490 mikron. Tubuhnya bulat berwarna coklat kekuningan sebelum menghisap darh dan berwarna merah setelah menghisap darah dari induk semangnya.
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