We were engaged to submit a biological treatment option as a comparison.
Client: Rangitikei District Council
Commissioning Date: January 2011
Retrofitted floating treatment media for clean effluent all year ‘round
The Hunterville WWTP was undergoing an upgrade for the discharge of their wastewater. The Regional Council supported two options — both expensive options for such a small population and rating base to support.
Description
All parameters (BOD, TSS, TN) modelled for discharge met consent standards except DRP and E Coli. Therefore, the design includes a low-rate mechanical plant and UV treatment. The mechanical treatment is a process of flocculent (alum) and a moving sand bed filter, which binds the phosphorus. This is then discharged through a filter bed and back into the head of works. The phosphorus is bound in the filter bed.
Benefits
The retrofitted floating treatment media onto the existing asset is consistently delivering a very clean effluent quality throughout all the seasons.
The effluent quality we have now at Hunterville WWTP is possibly the cleanest of any WWTP in the country and would have the best value engineering cost wise
| Parameter | Avg (mg/L) | Max (mg/L) |
|---|---|---|
| BOD | 265 | – |
| TSS | 265 | – |
| TKN | 55 | – |
| NH4N | 45 | – |
| TP | 1- | – |
| Tmin | 8°C | 8°C |
| Tmax | 20°C | 20°C |
| Flow Data | ||
| ADWF – 2020 | 175m3/d |
< 2[/av_cell][av_cell col_style='avia-center-col']< 2[/av_cell][av_cell col_style='avia-center-col']2.1[/av_cell][/av_row]
[av_row row_style=''][av_cell col_style='avia-center-col']DRP[/av_cell][av_cell col_style='avia-center-col']2.1[/av_cell][av_cell col_style='avia-center-col']0.005[/av_cell][av_cell col_style='avia-center-col']0.01[/av_cell][/av_row]
[av_row row_style=''][av_cell col_style='avia-center-col']E Coli[/av_cell][av_cell col_style='avia-center-col']250 mpn/100ml[/av_cell][av_cell col_style='avia-center-col']< 10 mpn/100ml[/av_cell][av_cell col_style='avia-center-col']< 260 mpn/100ml[/av_cell][/av_row]
[/av_table]
[/av_one_half][/av_section]
