Method and installation for ozone treatment of wastewater
AssigneeXylem IP Management S.à R.L.
InventorsWiebke Rand, Hans-Joachim Anton, Manfred Hohloch
Life of this patent
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Abstract
A method and an installation for treating a main wastewater stream flowing in a closed conduit with a flow direction. The method includes the steps of: introducing a liquid into at least one pre-treatment stream; generating a gas stream containing ozone gas; introducing the gas stream into the at least one pre-treatment stream, each with a gas injector, resulting in at least one mixed-phase stream comprising ozone laden gas and liquid; passing the at least one mixed-phase stream through at least one static mixer, resulting in a predefined gas bubble size; and injecting the at least one mixed-phase stream in the main wastewater stream perpendicular to the flow direction.
Claims20
A method for treating a main wastewater stream flowing in a closed conduit with a flow direction, the method comprising the steps of:
- introducing a liquid into at least one pre-treatment stream;
- generating a gas stream containing ozone gas;
- introducing the gas stream into the at least one pre-treatment stream with a gas injector, resulting in at least one mixed-phase stream comprising ozone-laden gas and liquid;
- passing the at least one mixed-phase stream through at least one static mixer and through an injection tube arranged parallel to the flow direction of the main wastewater stream and having at its downstream end at least one injection outlet lying in one plane perpendicular to the flow direction;
- and
- injecting the mixed-phase stream in a vertically downward flowing part of the main wastewater stream perpendicular to the flow direction through the at least one injection outlet.
An installation for introducing ozone into wastewater for treatment for disinfection or oxidation purpose, said installation comprising:
- a closed conduit in which wastewater stream can be treated;
- an ozone generator configured to output ozone-rich carrier gas;
- an injector configured to mix at least one pre-treatment stream with the ozone-rich carrier gas resulting in mixed-phase stream;
- at least one injection tube arranged parallel to a flow direction of the wastewater stream, through which the mixed-phase stream can flow;
- at least one static mixer within the at least one injection tube;
- and
- at least one injection outlet lying in one plane perpendicular to the flow direction of the wastewater stream, positioned at a downstream end of the at least one injection tube, the at least one injection outlet configured to introduce the mixed-phase stream in a vertically downward flowing part of the wastewater stream as a jet oriented perpendicular to the flow direction of the wastewater stream.
Dependencies are inferred from the claim text.