Study of integrated treatment of used bleaching earth cake from lubricant oil recycling process

Abstract

"Used Bleaching Earth Cake (UBEC)" is the bleaching earth which has been used and filter pressed from the lubricant oil recycling industry. Comprehensive treatment required to treat UBEC as hazardous waste. This research tested the physical and chemical characteristics of UBEC to acknowledge its potential as engine fuel, and then UBEC was combusted in rotary kiln as refuse derived fuel (RDF). The bottom ash from the combustion process was used as fine aggregate replacement in concrete K350 production, compressive strength and Toxicity Characteristic Leaching Procedure (TCLP) was analyzed. UBEC consists of bleaching earth material (Monmorillonite 53.3% and Klinoptilolith 40%), oil residue, and impurities (heavy metals, carbon residue, etc.). Its calorific value ranges from 3000 to 5000 calories and meet the standards for being used as RDF. The average compressive strength result by replacing fine aggregate with 0%, 5%, 10%, 15% and 20% of its ashes were 31.88 MPa, 34.15 MPa, 38.45 MPa, 37.66 MPa, and 36.69 MPa, respectively. The highest compressive strength was at 10% of replacement. TCLP results still meet the standard. Overall, UBEC can be use as RDF and its bottom ash can be safely use as replacement for fine aggregates in concrete K350 production.