Abstract
Abstract This study investigated the SCWO (supercritical water oxidation) treatment of wastewater sludge and degradation of p-tert-butylcatechol (TBC) under a range of operating conditions including sludge solids content (2%–12%), TBC concentration (0.1%–1%), reactor temperature (400–550 ° C), reactor pressure (18–28 MPa), oxygen excess (n=1-8) and residence time (1–30 min). Treatment performance was evaluated by measuring the chemical oxygen demand (COD) and using Fourier Transform Infrared Spectroscopy (FTIR) The best operating conditions for sludge treatment were found to be T=550 °C, P=25 MPa, n=5, and t=10 min. SCWO was very effective for sludge treatment, and over 99% COD removal could be achieved under these conditions. The addition of TBC decreased the COD removal efficiency, but still, 98% COD removal with final COD values less than 50 mg/L could be achieved.
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