2017 Volume 17 Issue 7 Pages 305-311
Bio-diesel fuel, BDF, is manufactured using waste food oil in Japan, consequently leaving a glycerol waste fluid as a by-product. BDF is prevailed as ecological fuel, however, the glycerol waste fluid is considered as difficult in recycling in that it contains not only organic glycerol, unreacted methanol and waste food oil but an inorganic alkaline catalyst like KOH, contributing to high viscosity and strong alkalinity. In this research, the glycerol waste fluid was treated by dilution and neutralization to yield oil-liquid layers of which top was separated oil and bottom was a degreased glycerol solution. As the separated oil had a high heating value, it recycled as fuel oil and used for a raw material of bio-reclaimed oil which was made of reclaimed oil and waste food oil. On the other hand, as the degreased glycerol solution was rich in organic carbon while poor in nitrogen content, it recycled as a denitrification agent and used for a substitute for 50% methanol solution ordinary utilized in an excretion treatment facility. The glycerol waste liquid could be completely recycled and used for the purposes through the treatment method.
