|
|
|
| Improvement of bioavailability of cobalt and iron by yeast extract in anaerobic system |
|
|
|
|
Abstract The improvement of yeast extract on solubility and bioavailability of Co, Fe in mesophilic and psychrophilic anaerobic system were studied. The results indicated that the dosing of yeast extract could significantly increase the solute concentration of Co and Fe in pure water and water with different organic matters, as well as improve their bioavailability in psychrophilic anaerobic system. The dissolved concentration of Co and Fe, especially Fe, increased obviously after yeast extract dosing in water at both 15℃ and 35℃. Wastewater such as brewery wastewater which contains yeast extract contributed to this promotion as well. COD removal efficiency decreased from 91.6% to 58% after removing of yeast extract, Co and Fe in the anaerobic system operated at 15℃. It increased slightly after dosing Co and Fe again, while a remarkable increase (31.6%) appeared when yeast extract was dosed simultaneously, and so does the methane production rate. It is proved that a simultaneous dosing of Co and Fe with yeast extract could improve the performance of psychrophilic anaerobic treatment system.
|
|
Received: 20 July 2009
|
|
|
|
|
|
|
