Abstract
The biodegradation and inhibition kinetics of a commercial nonylphenol ethoxylate formulation were modelled for an activated sludge system fed with a synthetic substrate and nonylphenol ethoxylate mixture. Kinetic and stoichiometric coefficients of the proposed activated sludge model were obtained by employing on-line respirometry. Experimental as well as model results confirmed that nonylphenol ethoxylate exhibited non-competitive inhibition on the hydrolysis process with a coefficient of 150. mg/L on the basis of COD and negatively influenced biomass growth through a competitive inhibition mechanism with a coefficient of 500. mg/L on the basis of COD, when the biomass was not acclimated. Upon acclimation of the activated sludge system, the inhibition concentration for non-competitive inhibition on hydrolysis was increased to 5000. mg/L, practically showing no inhibition, and the coefficient of competitive inhibition increased to 450. mg/L, corresponding to a significant decrease in the inhibitory effects of NPEO on growth.
| Original language | English |
|---|---|
| Pages (from-to) | 8058-8066 |
| Number of pages | 9 |
| Journal | Bioresource Technology |
| Volume | 101 |
| Issue number | 21 |
| DOIs | |
| Publication status | Published - Nov 2010 |
Funding
The authors acknowledge the financial support of The Scientific and Technological Research Council of Turkey (TUBITAK) under Project No. 108Y051. The authors also thank Betul Hande Gursoy and Asli Akin for their help and assistance in the acclimation and respirometric experiments, respectively.
| Funders | Funder number |
|---|---|
| TUBITAK | 108Y051 |
| Türkiye Bilimsel ve Teknolojik Araştirma Kurumu |
Keywords
- Activated sludge modelling
- Alkyl phenol ethoxylates
- Biodegradation kinetics
- Inhibition kinetics
- Nonylphenol ethoxylate
