| Scheme Drivers |
Bathing Water Compliance
Urban Wastewater Treatment Compliance
Shellfish Directives
Possible Future 'N' Removal |
| Strategic Review -2003 |
Stage 1 - Detail level of improvements required |
Stage 2 - Identify
- Process options
- WTW locations / Pipeline options
- Effluent Discharge Routes |
| Stage 3 - Assess Options in the light of planning and
environmental policies
47 options - shortlist of 4 options |
| Stage 4 - Identify option which best meets policies, operational
requirement and deliverability objectives |
| Short Listed Options |
1. WTW with Marine Discharge at Foreness
Point |
| 2. WTW at Half Mile Ride (urban fringe)
with Marine Discharge at Foreness Point |
| 3. WTW at Weatherlees Hill with Marine
Discharge at Foreness Point (View Option 3) |
| 4. WTW at Weatherlees Hill with Discharge
to River Stour |
| Key Stakeholders |
Kent County Council |
| Environment Agency |
| OFWAT |
| Thanet District Council |
| English Nature |
| DEFRA |
| Local residents, businesses, other
organisations and their political representatives |
Key Scheme Elements
- Broadstairs |
Refurbishment of existing plant and new
pumping plant at Broadstairs headworks to transfer 3xdwf to Margate. |
| Refurbishment of Broadstairs storm
outfalls. |
| Construction of 500mm dia. transfer
pipeline from Broadstairs to Foreness Point. (Trenchless techniques
through North Foreland Golf Course ). |
Key Scheme Elements
- Margate |
Replacement of existing preliminary
treatment plant (6mm screening of all flows). |
| New pumps to transfer 3xdwf to Weatherlees
site for full treatment. |
| New 3800 m3 storm tank within existing
structure - all stored flows returned for full treatment. |
| New 0.6km storm outfall constructed in
tunnel under the foreshore. Designed to operate < 2 times per bathing
season. |
| Extension of above ground building to
accommodate modifications. |
Key Scheme Elements
- Pipelines |
Twin 800mm dia. Pipelines between Foreness
Point and Weatherlees site. Approx length 12km. Flow transfer to
Weatherlees and return effluent to Foreness Point. |
| Route chosen to minimise both the
environmental impact and construction time. |
| Open cut construction across open and
agricultural land. Tunnel through the Cliftonville, Northdown, Westwood
& Manston Airport to minimise disruption. |
| Special protection measures through
groundwater 'Source Protection Zones'. |
Key Scheme Elements
- Weatherless |
Construction of new WTW adjacent to (but
independent from) the existing WTW serving Ramsgate, Sandwich and Deal. |
| Grit / grease removal. Compact Primary
Treatment. Conventional Secondary Treatment. UV disinfection. |
| Full odour control system. |
| Sludge thickening and dewatering, for
removal as cake to a regional sludge treatment centre. |
| Why not discharge to the Stour? |
The River Stour flows through a number of
nationally and internationally important nature conservation sites
including Pegwell Bay. |
| The effect of an additional 70 million
litres per day could adversely affect the constrained river environment |
| Adverse water quality impacts due to low
dilution (6:1) in the Stour which already carries a heavy effluent load. |
| Discharge to sea via the existing long sea
outfall will achieve high initial natural dilution (50: 1) and good
dispersion. |
| Consequences of treatment process failures
will have greater adverse impact in a highly sensitive river
environment. |
| The River Stour option was considered
potentially more damaging environmentally. |
| Re-cycling of Treated
Wastewater |
Current supply-demand balance shows no
requirement for a new strategic water resource within Thanet until 2015
at the very earliest. |
| Current proposals do not prevent treated
wastewater from being used directly or indirectly for future water
supply in the future, if it becomes publicly acceptable and cost
effective. |
| Flooding implications if water sources are
already full. |
| Continuous process -cannot switch off
wastewater treatment works. |
| What Happens Next? |
Submit Planning Application -July 2004 |
| Local Consultation -Through 2004 |
| Construction Tender Period -Sep to Dec 2004 |
| Planning Consent -Dec 2004 |
| Discharge Consent -Dec 2004 |
| Construction -2005 -2007 |
| Compliance -Late 2007 |
