PEMANFAATAN CAMPURAN ARANG AKTIF KAYU Muntingia calabura L. DAN BAKTERI Escherichia coli PADA PENGOLAHAN LIMBAH KROMIUM INDUSTRI ELEKTROPLATING
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Abstract
The presence of heavy metal chromium wasted from electroplating industry could harm human health, such as
posing cancer and kidney failure. In order to overcome this problem, the effluent treatment was carried out by means of
adsorption of chromium using wood activated charcoal. This paper aims to study the benefits of Muntingia calabura
wood activated charcoal, especially seeking its optimal conditions for adsorption test and the ability of Escherichia coli
bacteria to turn out chromium (VI) biodegradation into chromium (III) on chromium waste of electroplating industry.
Wooden charcoal was produced after heating wood at 500°C for an hour and it was activated using hot water vapor at
800°C for 70 minutes and pressure 120 mBar. The adsorption test was conducted in variation of 20−100 mg/L of
adsorbate initial concentration, contact time 45−105 minutes, and stirring speed of 100−300 rpm. Biodegradation
test was conducted using Escherichia coli bacteria which was incubated in nutrient broth containing of adsorption
waste. Results showed that the optimal conditions of the adsorption test was recorded at the initial concentration of
70 mg/L, 150 rpm stirring speed, 75 minutes contact time, and 86.7% adsorption effectivity. The biodegradation
effectivity for turning chromium (VI) into chromium (III) was recorded at 98.6%.
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