JOINT COST ALLOCATION OF CHEESE-MAKING WASTES BIOCONVERSIONS INTO ETHANOL AND ORGANIC LIQUID FERTILIZER

Roostita Lobo Balia, Sunardi Sunardi, Gemilang Lara Utama, Martha Fani Cahyandito, Tubagus Benito Ahmad Kurnani

Abstract: Aims of this study was to determine the joint cost allocation in bioconversion of cheese-making wastes into ethanol and organic liquid fertilizer. Whey from cheese-making wastes, combined with napa cabbage wastes, has shown great potential for bioconversion into ethanol and organic liquid fertilizer as way to reduce the pollution load. Semi pilot scale experiment was done to fermented cheese whey and napa cabbage wastes, using the consortium of Candida lambica and Prototecha zopfii with the addition of 10% molasses at low temperature (17-21°C) for 72 hours in semi-anaerobic condition and resulting ethanol up to 11.06%. Economic feasibility was determined by calculating the joint cost allocation with the approach of market price method and the break even point (BEP). The results showed that bioconversion of cheese whey and napa cabbage waste savеs waste disposal costs, the fi nancial benefi ts increases to US$ 3 816.96 per month, reduces variable cost of the main product to 14.73% and attains the breakeven point in 3.53 months.

Keywords: cheese whey; cost analysis; ethanol; joint; liquid fertilizer; organic

Date published: 2018-01-15