Novel installation for the recovery of the agricultural water from the digestate - description of the proposed industrial process

摘要

Currently, the reclamation and re-use of water is much smaller than its potential, although more energy is needed to obtain and transport fresh water and this solution has more serious environmental impact. Agricultural irrigation is, by far, the largest application of reclaimed water worldwide, so proposed experiments may result in the production of water that can be used, among others, for crop irrigation. This paper describes a novel installation for the recovery of the agricultural water from the digestate, along with the results of initial experiments. Study indicates that approximately 920 liters of water can be recovered from one ton of the digestate, due to enhancement of the mechanical dewatering, by the process of hydrothermal carbonization. Dewatered hydrochars had lower heating value of almost 10 MJ/kg, indicating possibility of using it as a fuel for the process.