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AquaCritox LP

Low Pressure
Waste TypesSpent causticOperating TemperatureUp to 160°COperating PressureUp to 5 barResidence Time1-3 hoursCOD Destruction95%+

The AquaCritox® LP is a low-pressure hydrothermal oxidation (Wet Air Oxidation) solution specifically aimed at treating purely sulphidic spent caustic streams. The multi-step hydrothermal oxidation process uses air as the oxidant and operates at pressures up to 5 barg and temperatures up to 160°C.

ParameterAquaCritox LP
Feed flow rate (Design)Up to 15 m3/hr
Feed CODUp to 30,000 mg/L
Effluent sulphide< 50 ppm
Effluent thiosulphate~ 5000 ppm
Effluent COD95% destruction*
*The remaining COD will be primarily thiosulphate and suitable for discharge to the site wastewater treatment plant.

The treated effluent from the AquaCritox® LP will contain some level of thiosulphate suitable for discharge to a downstream wastewater treatment facility. The table below indicates expected effluent quality relating to a sulphidic spent caustic stream.

Tailored solutions can be offered for waste streams with flow rates below 15 m³/h. The main OPEX consideration for this process is maintenance related to rotating equipment and control valves. Low pressure and temperature operation allows for simple process equipment with limited maintenance requirement.