Grab samples were collected from the ABR
influent and the effluent of each cell. Gas samples were collected
from the headspace of each cell with 2 L Cali-Bond bags, fitted with
a septum for sample withdrawal. Quarterly, 3.8 cm core samples
were collected from each cell to determine solids and grease
accumulation. Influent temperaturewas logged with a submersible
HOBO Temp Pro V2 temperature logger. pH datawas collected with
Broadly James pH ProcessProbes. TSS, COD, dissolved COD, and
BOD5 analyses were conducted according to Standard Methods
(APHA, 2005). Gas flow was measured with Cole Parmer 0 to 500
SSCM gas flow meters.