Study on Processing of Animal Waste of Cattle Dung and Vegetable Waste of Brassica rapa in Continuous Anaerobic Digester

Abstract

The purpose of this study was to understand the effect of addition vegetable waste interspersed into continuous anaerobic digestions that are normally operated with a substrate from cattle dung. The vegetable waste that was studied in this case is napa-cabbage (Brassica rapa ). An anaerobic digester with a capacity of 200 liters was prepared for this study. In this study, the digester was operated with an input of 5 liters of a mixture of cattle dung and water (50%:50%) interspersed in 1 day with an input of 5 liters of a mixture of Brassica rapa waste and water (50%:50%). The methane content In the system with the addition of Brassica rapa is in the range of 9%-52%. The CO₂ content is in the range 15%-50%. The averages of pH  is found 7.3 and average temperature inside the digester is 32.1^oC.