The influence of anaerobic reaction time on the fraction of denitrifying phosphate accumulating organism in BNR precesses

Abstract

This study investigated the influence of anaerobic reaction time on the fraction of denitrifying phosphate accumulating organisms (DNPAO) to total phosphate accumulating organisms (PAOs) using a series of batch experiments. The results showed that the DNPAO increased as the anaerobic reaction time increased. This implied that the PHA (polyhydroxyalkanoates) accumulating rate of DNPAO was lower than that of non‐denitrifying phosphate accumulating organisms (non‐DNPAO). Thus, the DNPAO required a longer anaerobic reaction time to reach the saturated intracellular PHA level. Furthermore, more than two hours of anaerobic hydraulic retention time is necessary when designing an enhanced DNPAO process.

Key words:

• denitrifying phosphate accumulating organisms
• PHA
• anaerobic reaction time
• hydraulic retention time
• biological nutrient removal process

Notes

Correspondence addressee