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Storage-based denitrification with municipal wastewater: influence of the denitrification stage duration

Microbial polyhydroxyalkenoates (PHAs) degradation is the rate limiting step for denitrification which is based on microbial carbon storage. The influence of denitrification stage duration (3, 2 and 1.5 h) on PHA degradation kinetics and denitrification efficiency during PHA-based denitrification of municipal wastewater and acetate-based synthetic wastewater was investigated. PHA degradation kinetics showed a good fit to first-order reaction, with higher rates at higher PHA concentrations. Decreasing the denitrification stage duration from 3 to 2 h resulted in an increase in biomass PHA content with the corresponding higher specific denitrification rate. Moreover, the daily denitrification rates increased by about 30% in both the acetate fed reactor and the wastewater fed reactor. Further decreasing the denitrification stage duration to 1.5 h resulted in a decrease in sludge PHA content in both reactors. The amount of filtered chemical oxygen demand removed by storage and PHA stored, remained similar regardless of the denitrification stage duration.