Papermaking Waste Treatment by Supercritical Water Oxidation

Abstract

Supercritical water (over 374 centigrade and 22 MPa) has so high solubility for oraganic and oxgen that they are consist in homogeneous phase, So it is very easy to oxidize oragnic compounds. Furthermore, in supercritical water both hydrolysis and pyrolysis are occurred, so SCWO (super critical water oxidation) process has high decomposition ability for organic compounds.
We have already operated the SCWO pilot-scale plant which has the capacity of up to 2 ton/day since 1995. Using this plant, we have demonstrated to decompose various chemicals safely and completely. In this report, it is also demonstrated that papermaking wastes were completely decomposed by SCWO.