Aerated rock filter as a polishing unit for total nitrogen & phosphorus removal from domestic wastewater part 1
Nitrogen removal from wastewater often requires a highly cost of chemical treatment to prevent over loading of nutrient in effluent discharge to the surface water body. Therefore, in this study a pilot-scale vertical aerated rock filter (VARF) was principally design to remove total nitrogen fiom dom...
Saved in:
| Main Author: | |
|---|---|
| Format: | Thesis |
| Published: |
2012
|
| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/5582/ http://eprints.uthm.edu.my/5582/1/0838.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Nitrogen removal from wastewater often requires a highly cost of chemical treatment
to prevent over loading of nutrient in effluent discharge to the surface water body.
Therefore, in this study a pilot-scale vertical aerated rock filter (VARF) was
principally design to remove total nitrogen fiom domestic wastewater. The influence
of aeration flow rate at different filters depth has been studied. Wastewater from
UTHM wastewater treatment plant has been collected to operate the VARF in the
FKAAS Environmental Laboratory. Throughout the experimental period, the VARF
influent and effluent samples have been sampling and analyzed for total nitrogen,
ammoniacal nitrogen (AN), BOD5, COD, TSS, turbidity, DO and pH for to monitor
the filter effectiveness. From this study, it was indicated that most of ammoniacal
nitrogen were converted to nitrate-nitrogen in the highly aerated VARF system.
However, the rate was influenced by the airflow aeration rate. More than 90% of AN
were converted to NO3-N in the system at the filter depth of 0.75m and 1.0 m.
Results fiom this study shows that at the filter depth 0.75m and air flow rate of 10
Llmin has efficiently remove 50.4%, 51.9%, 74.7%, 99.2%, 96.2%, and 97.1% of
COD, BOD5, total nitrogen, ammoniacal nitrogen, TSS, and turbidity respectively
compared to the air flow rate of 20 Llmin at the same filter depth which is remove
42%, 72.1%, 54%, 95.1%, 92.4%, and 83.5% of COD, BOD5, total nitrogen,
ammoniacal nitrogen, TSS, and turbidity respectively. For pH and DO profiles, the
effluent values was found to be higher at the air flow rate of 10 Llmin, which is
range between 8.4 t0~~9a.5nd 7.6, 8.3 and 8.5 mg/L respectively. Meanwhile at air
flow rate of 20 Llmin is about 8.2 to 8.4 and 7.3, 8.1 and 7.0 mg/L respectively. By
complying with Malaysian Environment Quality (sewage) Regulations 2009, the
sample treated for all parameters are within permissible limit of standard B. |
|---|