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Supercritical water oxidation needs to be carried out at high temperature and high pressure, so the one-time investment and operating costs of the equipment are relatively large
.
Foreign studies have shown that in order to obtain a high temperature of 500～600℃, the theoretical calorific value of wastewater should be >3400kJ/kg, that is, if the COD value of wastewater reaches more than 30000mg/L, the reaction can proceed automatically without external heat supply, which can greatly Reduce the operating cost of the SCWO process
Since there is no industrial-scale supercritical water oxidation equipment in China so far, there may be large deviations in the estimation of the funds for supercritical water oxidation technology
.
Of course, the total estimated cost of degrading 1 ton of wastewater with a 10% organic content is less than US$300
Although supercritical water oxidation technology still has some of the above-mentioned problems to be solved, due to its outstanding advantages, more and more attention has been paid to the treatment of hazardous waste.
It is a new type of treatment with broad development and application prospects.
Technology
.
At present, the use of SCWO to treat various waste water and activated sludge has been successful, and industrialized devices have appeared abroad
