Holiday Inn Hotel, Hampshire
Plant Equipment: Ocean Professional MBR 500
- Daily flow (m3/day): 76.0
- BOD load (kg/day): 36.12
- Ammonia load (kg/day): 3.25
- Effluent target: 5mg/l NH4-N
The Site
When Holiday Inn decided to build a new hotel on the edge of the South Downs at Winchester, quality and the environment were top of their agenda. The hotel has 141 rooms, conference facilities and a restaurant that has recently been awarded an AA Rosette for high quality food. The hotel was constructed over a chalk drinking water aquifer, which led to the Environment Agency specifying tight ammonia consent. With this criteria to meet EnSo put forward the Ocean Professional Membrane Bio-Reactor (MBR)
EnSo International, together with Morgan Ashurst, successfully completed the installation and commissioning of the new wastewater treatment plant. The system has been operational since February 2010 and the results from the final effluent samples are consistently below the required consent limits.
Plant & Equipment
There were a number of space constraints on site and we were asked to design a system that could be installed with a 2.4m deep inlet invert with location below the coach-parking area, which would also help the aesthetics of the hotel. To aid efficient sampling with minimum disruption to the car park, ports were cast into the tank to allow monitoring from ground level without having to lift any covers. This state of the art system can treat sewage from 500pe but with a footprint of only 10m x 7m. As with all MBRs, this is a high rate process therefore more time is required to operate and maintain the system. EnSo have been employed by the hotel to carry out all of the servicing and maintenance on the MBR.
Process Description
As there is a large restaurant on site a Waste Disposal Tank and Grease Trap were supplied to capture FOGs (fats, oils and grease) and putrescibles from the kitchen. A three stage primary settlement tank efficiently captures gross solids and is followed by a pre-aeration tank. A separate MBR tank allows fully treated effluent to be drawn through the membranes prior to discharging to the soakaway located below the car park.
