Influence of oxidation coefficient on product properties in sewage sludge treatment by supercritical water

► Products in a wide range (0-2.5) of oxidation coefficient (n) were explored. ► Reaction mechanisms under different n conditions were discussed. ► Sewage sludge was disposed by the coupling approach of SWPO and SCWO. ► Corrosion properties of stainless steel 316 with n increasing were checked.