Treatment of potato farm wastewater with sand filtration.

Bosak, V.K., VanderZaag, A.C., Crolla, A., Kinsley, C., Chabot, D., Miller, S.S., and Gordon, R.J. (2016). "Treatment of potato farm wastewater with sand filtration.", Environmental Technology. doi : 10.1080/09593330.2015.1122095  Access to full text

Abstract

This study examined sand filtration as a component of a potato farm wastewater treatment system. Two different sand filter designs, saturated flow and unsaturated flow, were evaluated at three different loading rates: 34, 68, and 136 L m−2 d−1. Filter design had a significant effect, with unsaturated flow sand filters having significantly (p < .05) better total suspended solids (TSS) removal (89%) than saturated flow sand filters did (79%). Loading rate also had a significant (p < .05) effect, given that the lowest loading rate had higher mass removal for TSS than the higher loading rates did. Overall, all sand filters removed TSS, 5-d biochemical oxygen demand, and total phosphorus well (62–99%). Total nitrogen removal was twice as high in unsaturated flow filters (53%) than in saturated flow filters (27%), because of the recurring cycle of aerobic and anaerobic conditions during sand saturation and drying in unsaturated flow sand filters.

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