AquaCritox® is a high pressure, high temperature hydrothermal oxidation technology which allows oxidising resilient and hard-to-remove COD in a broad range of waste streams. The technology was initially designed to operate at supercritical water conditions, i. e. above 221 bar and 374 °C. In recent years, the technology has been adapted to subcritical conditions by SCFI Ltd. to comply with the needs of spent caustic treatment and other applications.

The centrepiece of the AquaCritox® technology is its tubular reactor. This design offers many benefits, including easily withstanding high pressures and temperatures, elimination of back-mixing, and therefore very short reaction times and improved safety. As oxidation agent, pure or nearly pure oxygen is used.

The oxidation reaction is exothermic; to benefit from this effect, heat recovery from the reactor effluent is used to preheat the feed flow, optimising the energy demand of the system. For high COD effluents, the energy released during oxidation may even be sufficient to allow autothermal oxidation. Due to the novel multi-stage design of the AquaCritox® tubular reactor, the injection of both oxygen and quench water can be continuously optimised and monitored giving complete control of the exothermal oxidation reaction at every stage of the process. The innovative valveless pressure control system eliminates the use of control valves, which are prone to erosion, malfunction and high maintenance demand.

Therefore, the AquaCritox® technology provides a reliable and cost-effective option for waste stream disposal.

In our facilities in Cork, Ireland, we currently operate the AquaCritox Hydrothermal Laboratory Test Rig. It is a simple format test rig, which allows adjusting many variables including pressure, temperature, residence time, and oxygen addition to achieve varying levels of oxidation. Enhanced oxidation in subcritical and supercritical conditions can be studied.

Laboratory testing may be planned as a standalone activity or as precursor to progressing to large-scale testing. The laboratory unit usually utilises small scale samples ranging from 10 – 25 L. The test rigs allow us to study the effects of pressure, temperature, residence time, and oxygen addition on oxidation efficiency.

For spent caustic treatment large-scale testing, a Demonstration unit is available.




Webinar: AquaCritox® SC "Next Generation Hydrothermal Oxidation of Resilient and Hard-to-Treat COD in Spent Caustic"
In this webinar we provide a full product presentation of our latest application. This presentation is proudly presented by our Director Business Unit AquaCritox®, Mr. Björn Otto and AquaCritox® Product Manager, Mr. Jeff Broderick.

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