SUPERCRITICAL WATER OXIDATION OF INDUSTRIAL WASTE WATER FROM PILOT TO DEMONSTRATION PLANT

摘要

Supercritical water oxidation (SCWO) has demonstrated to be a powerful technology for the treatment of wastewater containing organic matter. The commercial development of this technology goes mainly through engineering considerations. Previous results of the research group provide the pilot plant operating conditions used in the design of the reactor and energetic studies. These operating conditions are reaction temperature of 650℃, pressure of about 25 MPa, and the stechiometric proportion of oxygen, independently of the nature of the waste. The good results obtained with the operation have allowed the construction of a demonstration plant in the site of the waste - treatment company CETRANSA in Santovenia de Pisuerga (Valladolid). This plant has a treatment capacity of 200 kg/h. it uses pure oxygen as oxidant, and operates at 650℃ and 25 MPa. A new cooled wall reactor has been designed from the scale-up of the pilot reactor. Solids are separated before going into the reactor by precipitation in a settle device. In this paper, the scale -up studies from the pilot to the demonstration plant are presented.