Pemanfaatan Limbah Spent Catalyst dari Residue Catalitic Cracking (RCC) Unit 15 Pertamina IP VI Balongan sebagai Filler pada Paving Blok

Abstract

Spent catalyst at Pertamina UP VI Balongan from RCC 15 belongs to the hazardous waste, therefore it needs special handle. The objective of this research is to find out the immobilization level of metals in the paving blocks which is added by spent catalyst and other aditive substances which are helpful in the chain process. Beside that, it can be know the pressure strength and water absorbance capacity of the paving blocks. The method use is spent catalyst waste solidification. In this solidification process, uses various concentration, i.e. 0%, 16%, 23%, and 28%, then shaped it in 20x10x8 cm. The paving blocks are restored in 28 days. Then doing the pressure strength, water absorbance test, leachate test with the TCLP method and the production value. From the pressure strength, it is resulted the lowest pressure capacity i.e. 231.165 kg/cm², which is chategorized as the B pressure capacity, which is used for the parking lot with the minimum value 170 kg/cm²; the highest of water absorbance is 15.18% in the 28% waste addition; while the leachate test are 0.239 mg/l Cr, 0.586 mg/l Zn, 0.679 mg/l Pb, 0.149 mg/l Cu and 1.21 mg/l Ni. Those results are still under the TCLP standard, which are 5 mg/l Cr, 50 mg/l Zn, 5 mg/l Pb, 10 mg/l Cu, and 11 mg/l Ni. For the production value, the mean price for the paving blocks is Rp. 18.000/m² in the 18% waste addition. It is cheaper than the market price, i.e. Rp.28.000/m². As result the spent catalyst waste from the UP IV Balongan is proper from the technique, environmental health, and economic aspect.