Oxidation-filtration technology for water treatment system at Moosehead breweries Ltd.

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The presence of iron has long been a serious problem in public water supplies. As an inorganic contaminant present in brewery feedwater streams, concentrations reduced to as low as drinking water quality guidelines can still be undesirable. For beer manufacturing, iron concentrations of less than 0.1 mg/ L are recommended to avoid adverse brewing conditions. The existence of iron concentrations above this target can lead to operational problems with downstream process equipment and lead to dark colours and sharp tastes in the final product. To remove soluble iron, it is generally accepted that an oxidation process followed by a suspended solids removal process (e.g., filtration) is effective. The overall objective of this 6-month research project will be to investigate oxidation-low pressure membrane filtration technology for low-level iron removal. Dalhousie University in Halifax, NS partnered with Moosehead Breweries Ltd. in Saint John, NB will conduct bench-scale testing to investigate an oxidation-ultrafiltration (UF) treatment train for the removal of iron to concentrations below the maximum acceptable concentration (MAC) of 0.3 mg/ L set forth by the Canadian Drinking Water Quality Guidelines. There are several published studies that outline design guidelines for the removal of iron from groundwater sources required to achieve regulatory potable water quality levels. However, there is a paucity of information in literature on capabilities of oxidation-UF to achieve iron concentrations lower than potable water standards in terms of the optimum oxidant type, dose and hydraulic retention time requirements and membrane fouling abatement strategies. Several oxidation approaches will be evaluated (aeration, chlorine and potassium permanganate) in conjunction with UF treatment and examined in terms of iron removal capabilities under variable contact time and resultant finished water quality. Overall, this study will focus on developing new design guidelines with advanced water treatment technologies for achieving high quality water targets for the food and beverage manufacturing sector.