PENGARUH VARIASI KONSENTRASI ADSORBEN BIJI TREMBESI TERHADAP PENURUNAN KADAR LOGAM KROMIUM (CR) TOTAL PADA LIMBAH INDUSTRI SASIRANGAN

The production process of sasirangan fabric produced liquid waste from dyeing and coloring process. One of the pollutant that contained in liquid waste was chrom metal. Reduction of Cr metal from sasirangan industrial liquid waste used tamarind (trembesi) seeds as the adsorbent. The purpose of this research was to know the effect of adsorbent concentration 1; 2; 3 and 4 % w/v to reduction of Cr metal in sasirangan industry. Variation of adsorbent concentration that used 1 g/100 ml, 2 g/100 ml, 3 g/100 ml and 4 g/100 ml Sasirangan liquid waste by stirring for 30 minutes in 100 rpm at 55oC and the size of adsorbent was 250 micron. The pyrolisis process had setting at 450oC temperatures for 5 hours operation. Adsorbent was activated by HCl 0.1N for 24 hours. Chrom metal residu which contained in sasirangan waste was analyzed using ICP (inductively coupled plasma). This analysis aims to determine residual chrom metal concentration in sasirangan industries after adsorption process. The greater adsorbent was added at adsorption process, the less residual chrom metal concentration which contained in sasirngan waste. The results of this research showed that adsorbent can decrease Cr metal up to 80.65%. The initial concentration of Cr metal in sasirangan waste was 2 ppm and the decreasing of Cr metal maximum remaining was 0.347 ppm at 2 g adsorbent.