A Mass Balance-Based Method for the Anaerobic Digestion of Rice Straw

Current rice straw disposal practices have serious repercussions on the environment and, in addition, do not consider its energy potential. On contrary, anaerobic digestion of makes it possible to produce renewable and reintroduce into soil nutrients present digestate, at same time, reducing greenhouse gas emissions from paddies. For different geographical origin, by applying a mass balance method digester, minimum requirements terms conditioners (nitrogen, phosphorus potassium) water, which allow obtaining maximum production methane, were calculated. The results obtained show that after first 30 days (hydraulic retention time) for each ton digested, daily water consumption varies considerably one country another, value 1.5 m3/d 4.3 m3/d. After addition nitrogen is only required optimal Indian straw. low presence these elements requires an 3 kg/d urea superphosphate compensate lack phosphorus, respectively. In all examined cases, concentration potassium, even if higher than value, does reach levels can significantly affect methane production.