Client: Manawatu District Council
Commissioning Date: June 2013
Population Equivalent: 150
Flow Rate: 35m3/day (average dry-weather flow)
How Floating Treatment Media helped the Kimbolton wastewater treatment plant meet compliance
Prior to our envolvement, the Kimbolton wastewater treatment plant was operating with fine bubble aeration in conjunction with a thin geotextile curtain submerged in the pond. Cold winter temperatures caused nitrifiers to slow down below optimum performance levels. As a result, the ponds failed to reach compliance for ammonia levels
Description
The Pond had sufficient oxygenation via the original fine bubble aeration. However, the activity of nitrifiers was reduced to non-compliance levels due to low winter temperatures. The addition of Floating Treatment Media fibrous plant roots above the fine bubble aeration provided the fixed biofilm habitat and enormous surface area for the essential microbiological communities to thrive, including those suitable for nitrifying.
Benefits
The retrofitted Floating Treatment Media onto the existing asset is consistently delivering a very clean effluent quality throughout all the seasons.
| Parameter | Avg (mg/L) | Max (mg/L) |
|---|---|---|
| BOD | 95 | – |
| TSS | 75 | – |
| TKN | 55 | – |
| NH4N | 54 | – |
| TP | 12 | – |
| pH | 7.5 | – |
| Tmin | 8°C | 8°C |
| Tmax | 20°C | 20°C |
| Flow Data | ||
| ADWF – 2020 | 35m3/d |
| Parameter (mg/L) | Avg (mg/L) | Consent Limits |
|---|---|---|
| BOD | 2.5 | 20 |
| TSS | 14.5 | 40 |
| TKN | – | – |
| NH4N | 0.5 | 1 |
| DRP | 5.5 | 2 |
| E Coli | 152 mpn/100ml | 200 mpn/100ml |
