Abstract
This study investigated relative magnitude of hydrolysis and ammonification by separate analysis of ammonia release and nitrification mechanisms. A peptone mixture was used as substrate in two parallel experiments seeded with nitrifying biomass conducted with and without nitrification inhibitor. Results were evaluated by means of model analysis of the ammonia and the oxygen uptake rate (OUR) profiles. A dual hydrolysis mechanism with maximum rate coefficients of 6.3 and 0.5/day characterized the peptone mixture and a kinetic balance was established for the ammonia release mechanism with a corresponding ammonification rate of 0.08m 3/g CODday. The experiments also showed a low soluble ammonia nitrogen generation that was rapidly depleted, confirming the existence of ammonification. These rate coefficients were verified using model calibration of the OUR profile related to simultaneous carbon removal and nitrification. Results indicated that ammonification would not be rate limiting for wastewaters such as domestic sewage, with lower hydrolysis kinetics.
| Original language | English |
|---|---|
| Pages (from-to) | 117-125 |
| Number of pages | 9 |
| Journal | Bioresource Technology |
| Volume | 114 |
| DOIs | |
| Publication status | Published - Jun 2012 |
Funding
This study was conducted as a part of the project “Evaluation of the Biodegradation Characteristics and Toxicity/Inhibition Effects of Xenobiotics on Nitrification Systems” and supported by the Joint Doctoral Degree Program of Turkish Academy of Sciences and the Scientific Research Fund of Istanbul Technical University .
| Funders | Funder number |
|---|---|
| Türkiye Bilimler Akademisi | |
| Istanbul Teknik Üniversitesi |
Keywords
- Ammonification
- Hydrolysis
- Modeling
- Nitrification
- Respirometry
