Abstract
The response of free nitrous acid (FNA)-adapted poly-phosphate accumulating organisms (PAOs) to FNA inhibition under aerobic and anoxic conditions was studied. Anoxic P-uptake was 1-6 times more sensitive to the inhibition compared to aerobic P-uptake. The aerobic nitrite reduction rate increased with FNA concentration, accompanied by an equivalent decrease in the oxygen uptake rate, suggesting under high FNA concentration conditions, electrons were channeled to nitrite reduction from oxygen reduction. In contrast, the nitrite reduction rate decreased with increased FNA concentration under anoxic conditions. Anaerobic metabolism of PAO under both anoxic and aerobic conditions was observed at high FNA concentrations. Growth of PAOs decreased sharply with FNA concentration and stopped completely at FNA concentration of 10μgHNO 2-N/L. This study, for the first time, investigated the function of nitrite/FNA in an aerobic denitrifying phosphate removal process by evaluating electron as well as energy balances, and provides explanation for FNA inhibition mechanisms.
| Original language | English |
|---|---|
| Pages (from-to) | 340-347 |
| Number of pages | 8 |
| Journal | Bioresource Technology |
| Volume | 116 |
| DOIs | |
| Publication status | Published - Jul 2012 |
| Externally published | Yes |
ASJC Scopus Subject Areas
- Bioengineering
- Environmental Engineering
- Renewable Energy, Sustainability and the Environment
- Waste Management and Disposal
Keywords
- Aerobic denitrification
- Detoxification
- Free nitrous acid (FNA)
- Phosphate uptake
- Poly-phosphate accumulating organism (PAO)
