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Supercritical water oxidation system

Equipment

Supercritical water oxidation (abbreviated as SCWO) technology is a technology that can realize advanced oxidation treatment of a variety of organic wastes.

Supercritical water oxidation equipment
Supercritical water oxidation equipment

Supercritical water oxidation is to completely oxidize organic matter into clean H2O, CO2, N2 and other substances through oxidation. S, P, etc. are converted to high-valent salts for stability. After oxidation, heavy metals are stably stored in the ash as a solid phase.

Principle

The principle of supercritical water oxidation technology is to use supercritical water as the reaction medium to quickly convert organic matter into CO2, H2O, N2 and other harmless small molecules through a homogeneous oxidation reaction.

Supercritical water oxidation technology has achieved great success in the treatment of various wastewater and surplus sludge. Its disadvantages are harsh reaction conditions and strong corrosiveness to metals, as well as oxidation of certain chemically stable compounds. It also takes a long time.

In order to speed up the reaction, reduce the reaction time, and lower the reaction temperature, so that the advantages of supercritical water oxidation technology are more obvious, many researchers are trying to introduce catalysts into the supercritical water oxidation process.

Application

Organic wastewater treatment

The supercritical water oxidation method has unique advantages in the treatment of organic wastewater. It is currently the most widely used supercritical water oxidation technology. Applications include chemical, metallurgy, printing and dyeing, papermaking, medicine, petroleum, food and brewing industries. It can treat phenols, Methanol, nitrobenzene, urea, dioxins, PCBs, etc.;

Disposal of toxic organic waste

Supercritical water oxidation process treats most difficult-to-degrade and highly toxic organic pollutants, including phenols, benzene, nitrobenzene, aniline, halogenated hydrocarbons, polychlorinated biphenyls, polycyclic aromatic hydrocarbons, pyridine, organochlorine pesticides, and organophosphorus Pesticides, dioxins, chemical weapons BZ, nerve gas, and supercritical water oxidation technology can all be processed, with low processing cost and high efficiency;

Sludge treatment

The supercritical water oxidation method can completely remove the activated sludge produced during the biochemical treatment of sewage and clean the products;

Waste plastic treatment

Supercritical water is used as the reaction medium to degrade waste plastics to recover monomers, and the processed products are low-molecular-weight hydrocarbons. The products can also be used as fuels. It is an effective and rapid method to eliminate this type of waste;

Processing of metabolites

The supercritical water oxidation method is also a fast and efficient way to treat human metabolites. Drinkable water can be recovered from human metabolites urine and sweat. The gas products produced are also non-toxic. It is a fully enclosed system for manned space flight. The disposal of waste water at any time provides the possibility;

Recycling of metals in wastewater

The supercritical water oxidation method can recover usable metals from radioactive wastewater. The principle is to use different metal ions to separate water at different speeds and to generate oxides to achieve separation.

Technical Indicators 

NoNameParameter
1Work pressure≤40MPa
2Working temperatureRoom temperature~550℃
3Oxidation kettle volume600mL/50MPa,HC276, 550℃, 2 sets
4Preheater temperature500℃
5Mixing systemAnchor magnetic stirring, 0-1000r/min stepless speed regulation
6Oxidizer typeHydrogen peroxide, oxygen, air, etc.
7Power supplyAC380V 50Hz three-phase five-wire 12kW

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