1. Located in Exmoor National Park, with nearby bathing beach 3800 population equivalent (summer) 1900 m 3 /d flow to full treatment Sewage feed started 12th February 1998 Porlock Sewage Treatment Plant Site data

2. Principle of Operation Screened crude sewage Treated & disinfected effluent Air in Waste Sludge (to further treatment) In Out

3. Membrane Filtration Air Bacteria Virus Solids Treated effluent Membrane

4. Porlock Treatment Building Tidal Storage Blowers Permeate Pumps Aeration Tanks 1 - 4 Anoxic recycle Tank 1. 2. 3. 4. Membrane Units Final Effluent out Crude Effluent inlet Fine Screens 3 mm Washing Tank

5. Porlock Aeration Tank MLSS Feb 98 - Sept 99

6. Porlock BOD Removal Feb 98 - Jan 00

7. Porlock NH 3/4 Removal Aug 98 - Apr 99 No ammonia consent No dissolved oxygen control

8. Porlock Faecal Coliforms Feb 98 - Jan 00 Sampling contamination identified Intensive sampling periods

9. Porlock Faecal Coliphage Virus Feb 98 - Jan 00 Change of test procedure

10. Porlock Final Effluent Turbidity Feb - June 1998 Turbidity meter set up incorrectly - readings higher than actual

11. Porlock STW- Compliance Results June 1998 – November 1999 Kubota Submerged Membrane Process