PENURUNAN KANDUNGAN PHOSPHAT PADA LIMBAH CAIR INDUSTRI PENCUCIAN PAKAIAN (LAUNDRY) MENGGUNAKAN KARBON AKTIF DARI SAMPAH PLASTIK DENGAN METODE BATCH DAN KONTINYU (Studi Kasus : Limbah Cair Industri Laundry Lumintu Tembalang, Semarang)

Abstract

Abstract Increasing the number of laundry industry influences on the increasing of detergent utilizzation. The dominant substance contained in the detergent is Natrium Tripolyphosphat, a builder and surfactant. Therefore the waste contains Phosphate. Most of the laundry industry throw their waste without treatment first. The waste would cause Eutrofication where the water body became rich of dissolved nutrient, descending of the dissolved oxygen and capability of water body assist power to water biota. Lumintu is one of the laundry industries which located in Tembalang district. According to the result of pre-experiment, industrial waste water containes 10,21 mg/l phosphate. This value exceeds standard quality of Perda Prov. Jateng no. 10 year 2004 about maximum value for total of phosphate is 2 mg/l. One of wastewater treatment method is adsorption using the active carbon from plastic rubbish kind of Polyethylene. This reseach purposes to know the capability of active carbon from plastic rubbish in reducing phosphate content with batch and column operation. The batch operation use 1,2 and 3 gram variation weight active carbon from plastic rubbish for 30 - 60 mesh and 100 - 200 mesh variation media size. The batch operation has 45,45 % from the highest phosphate efficiency lowering on the 3 gram. Otherwise, column operation need 1 inch column diameter with 50 ml/minute and 100 ml/minute debit variation. Continue trial had 54,75 % from the highest phosphate efficiency lowering on the 50 ml/minute. Constant value speed (k1) is 0,0108 ml/mg.s with capacity of adsorption (qo) 0,677 mg/g. Keyword : wastewater of laundry industry, phosphate, adsorption,active carbon from plastic rubbish