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Spent Caustic Treatment - AquaCritox® SC
AquaCritox® SC is a modern hydrothermal oxidation process optimised for spent caustic treatment. The AquaCritox® tubular reactor operates at up to 165 bar and 300 °C ensuring efficient and thorough oxidation of even hard-to-remove COD. The use of oxygen rather than air as the oxidant significantly increases the oxygen transfer rate, thereby achieving increased reaction rates and short retention times far below current industry standards. The valveless pressure release system offers increased reliability and longevity. Combining all benefits, AquaCritox® SC addresses the shortcomings of traditional bubble column based wet air oxidation systems.
Spent caustic is a noxious and toxic waste product generated by the oil and gas industry. The main oxidable compounds (COD) found in spent caustic include sulphides, mercaptans, phenols, cresylic salts and naphthenic salts.
High-temperature oxidation allows the far-reaching destruction of resilient COD. The AquaCritox® SC process therefore destroys all odour and toxicity precursors by oxidation, thus allowing treated spent caustic disposal through a conventional biological treatment plant or to the sewer.
Please contact us: aquacritox@he-water.com
For large scale testing, a mobile AquaCritox® SC demonstration unit is available. The feed capacity of the plant is 80 l/h and the system is designed to treat feed streams with up to 50 g/l COD. It is equipped with gas generation for oxygen supply and can be easily deployed on site. The unit consists of one 40 ft and two 20 ft containers which will be delivered to site on flatbed trailers.
The plant is operated from a control room which is integrated in one of the containers. The system works fully automated. Many parameters therefore are continuously monitored and logged. To ensure safe operation at any time, effective safety procedures have been implemented and tested.
AquaCritox® H is a modified AquaCritox® SC technology, carefully designed for the treatment of small flows of sulphidic spent caustic and other liquid waste streams. The process treats 400 l/h with chemical oxygen demand up to 30 g/l at 140 °C and 4 bar. As oxidizing agent, hydrogen peroxide is used which results in the production of almost no off-gas. In all cases hydrogen peroxide decomposes to water with no harmful by-products.
The AquaCritox® tubular reactor allows reliable control while eliminating back mixing and allowing shorter retention times. Locating the reactor within a pressurised jacket also provides secondary containment of the hot caustic process stream which increases overall safety.
The AquaCritox® H system is supplied factory tested, preassembled as a skid-mounted unit or containerised in a standard 20 ft shipping container ensuring optimised on-site installation and commissioning periods.
Our References
High-End UPW Plant for the Semi-Conductor Industry
Austria, 2020
The task was to implement a high-end ultrapure water plant for the treatment of well water for a well-known semiconductor manufacturer in Central Europe.
Offshore High Pressure High Performance Produced Water Treatment Package
Malaysia, 2014
A high-pressure high-efficiency produced water treatment system of Petronas an Sapura Energy designed to meet strict overboard discharge limits while accommodating onerous space and weight constraints imposed by offshore design requirements.
Award-Winner: AS Estonian Cell
Estonia, 2020
In 2020, AS Estonian Cell was declared the winner of the competition ”Environmentally Friendly Company of the Year in Estonia“. With H+E components Estonian Cell came a significant step closer to its goal of becoming the best producer of pulp in the world.