The growing popularity of biofiltration as a sustainable method for removing a wide array of contaminants, coupled with the recent focus on potential manganese (Mn) regulations (EPA included Mn on the CCL 4 and UCMR 4, and noted that Mn may play a role in distribution system corrosion control), has increased utility interest in the impact of biofilters on Mn removal.
Alameda County Water District (ACWD) has experienced Mn breakthrough across their biological filters below temperatures of 14°C. Typically, the biofilters remove 80-100% of the influent Mn, which historically is 100% dissolved. This project will evaluate the primary causes for reduced biological Mn removal under winter conditions by sampling across full-scale biofiltration facilities with varied source waters, temperatures, and operational strategies and conducting controlled bench-scale experiments. The research team will select optimization strategies for improving biological Mn removal under winter conditions and subsequently test those strategies at pilot-scale. Tailored Collaboration Partner: ACWD.