Abstract
AbstractNitrate generated in situ due to nitrification in an aerobic digester was utilized through endogenous nitrate respiration (ENR). This was done by alternating aerobic/anoxic (A/A) cycles. The destruction of volatile suspended solids (VSS) in the A/A system was the same as compared to a controlled‐aerobic digester. Approximately 33% of total nitrogen was removed in the A/A system of which 27% was due to ENR during anoxic cycles.During each anoxic cycle, nitrate reduction was found to be a zero order reaction with respect to nitrate. The specific ENR rates decreased significantly with digestion time due to changes in VSS. Both pH and alkalinity increased during anoxic cycles resulting in enhanced VSS decay and complete nitrification under subsequent aerobic conditions.The energy savings associated with the A/A system and the use of the specific ENR rates are discussed.
Published Version
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