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Partial denitrification/anammox (PdNA) is an emerging treatment process that can act as a supplement to, or in place of partial nitritation anammox for implementation in mainstream wastewater. A pilot scale PdNA moving bed biofilm reactor (MBBR) was operated at 20 °C. Glycerol, acetate, and methanol were evaluated as external carbon sources. Average PdN efficiency was 88% ± 13 with glycerol, 86% ± 10 with acetate, and 66% ± 11 with methanol. Contrary to previous reports, methanol was not inhibitory to anammox activity. The COD added per TIN removed was 2.41 ± 0.98, 2.02 ± 0.71, and 1.73 ± 0.81 g COD g N−1 for glycerol, acetate, and methanol respectively. During the methanol phase influent nitrite decreased the COD requirement, demonstrating that the polishing MBBR supports both two-stage PNA and single stage PdNA simultaneously. When only considering the PdNA route, methanol still had a …