The Establish Of Unit For TOC Measurement Based On Supercritical Water Oxidation And Its Prelininary Experiment

Based on the advantage of supercritical water oxidation (SCWO) bywhich various kinds of organic pollutants can be oxidized quickly andthoroughly, the measuring experiments of total organic carbon (TOC) ofwastewater are carried out. A unit which is consisted of low pressuregradient mixer, constant pressure pump, supercritical reactor, temperature-pressure-controlled system, gas-liquid separator and NDIR(Non-DispersiveInfra-Red) detector is designed and established to measure TOC ofwastewater. Potassium hydrogen phthalate and phenol are selected as themodel organic pollutant and is degradated by SCWO at pressure24.0MPa,temperature from380to440℃and oxidation coefficient from1.0to20.0.The results demonstrate that it is feasible and repeatable to measure theTOC of wastewater by SCWO. Meanwhile，the effects of temperature andoxidation coefficient on the result of TOC measuring are studied viapreliminary experiment. The results show that the percent conversion ofTOC first increased and then tends to be steady with the temperature or oxidation coefficient increases. We can also come with that the degradationrate higher with the temperature or oxidation coefficient higher, When m≥6.0and T≥440℃, the rate of oxidative degradation of organic pollutantalmost be degradated completely.At the same time, the mixed solution of glucose and phenol is selectedas an object, whose TOC is measured both by SCWO-NDIR and normalinstruments (high-temperature catalytic combustion method). Results showthat the linear regressions of the two methods are good, which proves thatthe method of using SCWO-NDIR to measure TOC is available.