A method for treating potato wastewater comprising the steps of pretreating a potato wastewater stream including suspended and dissolved solids with an alpha amylase enzyme to hydrolyze starch in the wastewater, ultra-filtering the enzyme-treated wastewater from step (a) to filter and remove a portion of the suspended solids in a first concentrate stream separated from the wastewater, and reverse osmosis-filtering the ultra-filtered wastewater from step (b) to remove at least about 70% of the wastewater dissolved and suspended solids in a second concentrate stream.
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