Thanet Earth is a new state of the art large greenhouse development comprising over 50 Ha of greenhouses growing a range of salad crops. The site is more than one mile from one end to the other, 30MW of CHP power plants feed electricity into the national grid. Salads are grown in Rockwool medium with nutrients and other inputs carefully controlled to maximise production.
BHA was commissioned by FRESCA/Thanet Earth Ltd to design the site water management system, and to manage the diversion of two large diameter water mains, and a 2.5 km wastewater pumping main. The irrigation water demand is over 400 000 m3 of water per year with this being provided from a ombination of rainwater harvesting, borehole supplies, and mains water. The scheme has involved extensive negotiations with Southern Water to procure adequate water can be supplied to the site and ensure security of supply.
The challenge was to maximise use of water resources by harvesting rainwater from the greenhouse roofs to satisfy supermarket requirements for sustainability. BHA are currently involved in further work in this respect to treat CHP condensate to enable some of this water to be recovered for plant irrigation hence further enhancing the project sustainability credentials.
BHA have been responsible for the design of an extensive on site water distribution covering irrigation supplies, potable water, borehole supplies and wastewater involving over 30km of pipework and nine pumping stations, greenhouses and packhouse via a series of offline pumping stations and shared rising mains to a terminal pumping station. The terminal pumping station has over 60m3 of storage capacity and pumps wastewaters 2.5 km to the nearest point of connection to the public sewer.
BHA and the project team were involved in extensive discussions with landowners and Southern Water to agree the point of connection, and the pumping Main route and easements across private land.
The wastewater system gathers domestic wastewaters and trade effluent from the greenhouses and packhouse via a series of offWline pumping stations and shared rising mains to a terminal pumping station. The terminal pumping station has over 60m3 of storage capacity and pumps wastewater 2.5 km to the nearest point of connection to the public sewer.