Inhibition of Catalyst Poisoning in Supercritical Water Gasification of Sewage Sludge: Technical Study on Reactor Design

摘要

A lab-scale batch reactor with two compartments, so called two-bed reactor, was introduced tothe supercritical water gasification of sewage sludge. With Ni catalyst presence, the reactor was capableof suppressing deposition of byproducts and residuals on catalyst surface attaining higher gasificationefficiencies. Moreover, acceleration of hydrogen gas production was achieved when K_2CO_3 was loadedwith the presence of Ni catalyst. Further studies have revealed that K_2CO_3 loading location influencedthe gasification behavior dramatically. Besides Ni catalyst, RuO_2 and Ru catalyst were also employedusing the reactor. In prospect of future application, discussion on heavy metal concentration in theeffluent is made as well.