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US 12,570,559 B2Granted
Methods and systems for treating phosphogypsum-containing water
AssigneeEvoqua Water Technologies LLC
InventorsWenxin Du, Hao Dang, Justin Wayne Higgs
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Abstract
Methods for processing pretreated phosphogypsum wastewater are disclosed. Precipitation of select constituents may be promoted to control a hardness level of the pretreated wastewater. Ammonia may then be removed from the process stream via reverse osmosis. A membrane contactor and/or polishing unit(s) may optionally be used. Related systems are also disclosed.
Claims16
A method of treating phosphogypsum-containing water, comprising:
- promoting precipitation of at least one target hardness species selected from one or both of a calcium species or a magnesium species from a pretreated supernatant to produce a process stream having a predetermined hardness level of about 100 ppm or less;
- removing non-ionized ammonia from the process stream having the predetermined hardness level using a gas transfer membrane contactor to produce treated water meeting at least one predetermined discharge requirement selected from a conductivity limit or a level of ammonia, fluoride, or phosphorous;
- and
- discharging the treated water.
1 more element
Dependencies are inferred from the claim text.