Marshwood Manor Country House Hotel: Sewage & Biorock Treatment Units Case Study

Marshwood Manor was a working farm now providing a large family home, 10 B&B rooms and 5 self-catering holiday cottages all converted from the original Victorian farm, stables and diary. Set in an Area of Outstanding Natural Beauty near Bridport on the Dorset coast, the Environment Agency identified Marshwood Manor as polluting the local watercourse during routine monitoring.

Non-electrical Outstanding Natural Beauty

Marshwood was asked by the Environment Agency to make appropriate improvements to their foul drainage infrastructure to meet current EA legislation. The polluting scheme comprised combined surface and foul water drains serving two separate septic tanks with direct connections to the local watercourse. Without any secondary form of treatment, the discharge of septic effluent to a watercourse is illegal under current and historic legislation.

WCI was instructed to specify and install a suitable sewage treatment works and to liaise with the Environment Agency, Building Control and other interested parties to effect a compliant and cost effective resolution. The required scheme needed to handle total daily flows of 9.72m3 with a total population equivalent of 54 with intermittent loadings from the 5 holiday lets and B&B.

The specified scheme addressed two key requirements: Firstly, a new surface water drainage scheme was designed to separate surface water from the existing foul drains from all of the various structures at Marshwood Manor. Secondly, following liaison with the EA and an update to the existing discharge permit, a Biorock non-electrical package sewage treatment scheme was specified to provide silent, cost-effective treatment of intermittent loads to a level consistent with the required 20:30:20 treatment standard. Installation of the specified scheme was completed under Building Control with activation of all relevant warranties.

The result: Marshwood Manor is no longer polluting and has consistently met the requirements of its Discharge Permit. Surface water is discharged through independent drains direct to the watercourse and a single combined treatment works has replaced the two separate schemes previously in place. The treatment works draws little attention as it doesn’t generate any noise and costs nothing to run.

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