Resumen
Due to increase in the amount of food waste, the proper method to dispose food waste has become a concern. The common methods are landfill, incineration and anaerobic digestion. Landfill and incineration has low demand because of high cost and not environmental friendly. Taking the circumstances into consideration, a traditional way to treat the food waste has increasing attention because of its advantages such as reducing waste pollution and producing clean energy. However, the constrain is the rate-limiting which is hydrolysis of fats, oil and grease. In this work, Lipase Candida Antarctica (Lipase CALB L) was used to facilitate the anaerobic digestion of food waste for 40 days. Physiochemical analysis includes pH and electrical conductivity test, moisture content, total organic carbon (TOC) and organic matter loss was done by using digestate of food waste and food waste with lipase. Germination index test was done to determine the phytotoxicity of the digestate. Application of Lipase CALB L increases the organic matter degradation by 18.86% and supported with high decrease of pH from 5.14 to 3.98 at day 10. However, there is no changes in the final pH for digestate with and without lipase is 4.06. Increase in degradation of food waste results in increase in nutrient content of digestate which decreases electrical conductivity from 6.26 mS/cm to 3.05 mS/cm. Increase in moisture content from 77.37% to 86.00% for digestate of food waste and lipase, facilitates degradation of food waste due to increase in population of microorganisms. The Total Organic Carbon is fluctuating throughout the digestion process. The phytotoxicity of food waste digestate is 5.08% and 30.37% for digestate of food waste and lipase. From this study, anaerobic digestion of food waste with lipase is more efficient however the final digestate is still toxic and not suitable for soil and land application.