Sutton oaks Care Home sewage treatment plant installation

We were requested to supply and install a sewage treatment plant to service the above care home.

To enable us to provide a treatment plant we were required to calculate the  flow and BOD loading’s generated by the care home. Based on the information provided by the client a sizing chart indicated that a 75 PE package treatment plant would be required to service the development.

A place to position the treatment plant was then required, on investigation the following problems were noted:

  1. Original foul drains were at a depth of 2.5 meters
  2. Foul water was combined with the surface water drains
  3. Food preparation on site, NO grease trap
  4. Laundry on site, volume of waste water to be included within treatment plant loading’s. 

Then to complicate the situation we found compacted sand/bedrock material at approximately 2.5/2.8 meters depth and the ground dropped away towards a wooded area and site boundary. 

SITE OPTIONS

  1. Excavate an area of 6 meters length,3 meters width 5 meters depth.
  2. Install a pumping station to uplift  the effluent into the treatment Plant.

CLIENTS REQUIREMENTS/INSTRUCTIONS

We were instructed to install a pumping station which would discharge into a 1 meter invert treatment plant which would be out of the ground on one side by 300/400mm, which would require the finished ground level uplifting and grading. The grease would be removed at source i.e kitchen and the surface water would be segregated, utilising the pumping station would reduce the requirement for excavating into the sandstone.

It was decided that a Conder CSAF 75 N20 Unit tank sewage treatment plant and V Pump 1.5m diameter  x 3m deep as inlet depth 1.9m (4875 litre capacity) pumping station would be supplied for the development.

The treatment plant/pumping station/sampling chamber were delivered to site on Friday 24th April 2015 

We attended site on Monday 27th April 2015 to start the installation and ground works.

No you’re not drunk it’s as we stated … the ground falls away. The wet well is in perfectly level and was checked by the Site Engineer, he thought we were p………. when we installed it!