Citation
Lim P.L., . and Yam W.C., . and Lim P.E., . (2003) Effect of Copper II and Cadmium II on the nitrification process in sequencing batch reactor. [Proceedings Paper]
Abstract
The objective of this study is to investigate the respective effect of CuII and CdII on the nitrification process under sequnecing batch reactor SBR operation. Three SBR reactors treating synthetic wastewater only and wastewater containing 5 mg/ Cu II and 15 mg/ Cd II respectively were operated with FILL NITRIFICATION DENITRIFICATION SETTLE DRAW and IDLE periods in the ratio of 4:9:3:1:1:6 for a cycle time of 24 h. The performance of the reactors was evaluated by monitoring the concentration profiles of COD ammoniacal nitrogen AN nitrite nitrogen NO2-N and nitrate nitrogen NO3-N during the NITRIFICATION and DENITRIFICATION periods. The results show that the reactors with Cu II and CdII addition respectively required longer period to achieve maximum COD removal compared to the reactor without metal addition. The percentages of AN nitrified to NO2-N and NO3-N were 21 and 1 respectively in the presence of Cu II and 17 and 1 respectively in the presence of Cd II. In contrast the corresponding percentages without metal addition were 0.4 and 39 respectively. This indicates that both CuII and CdII exerted an inhibitory effect on the activity of Nitrobacter bacteria during nitrification process. The kinetics of the nitrification process was modelled using a simple consecutive reactions mechanism.
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Abstract
The objective of this study is to investigate the respective effect of CuII and CdII on the nitrification process under sequnecing batch reactor SBR operation. Three SBR reactors treating synthetic wastewater only and wastewater containing 5 mg/ Cu II and 15 mg/ Cd II respectively were operated with FILL NITRIFICATION DENITRIFICATION SETTLE DRAW and IDLE periods in the ratio of 4:9:3:1:1:6 for a cycle time of 24 h. The performance of the reactors was evaluated by monitoring the concentration profiles of COD ammoniacal nitrogen AN nitrite nitrogen NO2-N and nitrate nitrogen NO3-N during the NITRIFICATION and DENITRIFICATION periods. The results show that the reactors with Cu II and CdII addition respectively required longer period to achieve maximum COD removal compared to the reactor without metal addition. The percentages of AN nitrified to NO2-N and NO3-N were 21 and 1 respectively in the presence of Cu II and 17 and 1 respectively in the presence of Cd II. In contrast the corresponding percentages without metal addition were 0.4 and 39 respectively. This indicates that both CuII and CdII exerted an inhibitory effect on the activity of Nitrobacter bacteria during nitrification process. The kinetics of the nitrification process was modelled using a simple consecutive reactions mechanism.
Additional Metadata
| Item Type: | Proceedings Paper |
|---|---|
| AGROVOC Term: | BIOREACTORS |
| AGROVOC Term: | NITRIFICATION |
| AGROVOC Term: | DENITRIFICATION |
| AGROVOC Term: | COPPER |
| AGROVOC Term: | CADMIUM |
| AGROVOC Term: | HEAVY METALS |
| AGROVOC Term: | WASTEWATER |
| AGROVOC Term: | WASTEWATER TREATMENT |
| AGROVOC Term: | NITRITES |
| AGROVOC Term: | NITRATES |
| Geographical Term: | MALAYSIA |
| Depositing User: | Ms. Norfaezah Khomsan |
| Last Modified: | 24 Apr 2025 05:27 |
| URI: | http://webagris.upm.edu.my/id/eprint/16227 |
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