Lustleigh WWTW

The Problem

Set in the heart of Dartmoor National Park, the picturesque village of Lustleigh - often called the prettiest in Dartmoor - presented a not-so-pretty operational challenge.

South West Water Ltd identified that ammonia levels at the site were no longer meeting required discharge standards. But improving treatment performance wasn’t the only hurdle.

Access to the site was severely restricted:

  • A narrow 2.5-metre-wide railway bridge blocked standard equipment delivery
  • Height constraints ruled out conventional plant transport
  • The rural, sensitive setting limited installation options

So the challenge wasn’t just what to install - it was how to get it there at all.

The Solution

Building on successful trials at Cullompton, SWW partnered with Advanced Solutions and Technologies Ltd to implement a Moving Bed Bio-Reactor (MBBR) system.

But this wasn’t a standard install.

To overcome the access constraints, AS&Tech engineered a modular, two-cell MBBR system:

  • Each unit sized at 1.5m x 1.5m x 3.3m, small enough for restricted access
  • Delivered individually by trailer and assembled on-site
  • Mounted on a prefabricated steel base to ensure precise alignment of pipework and air connections

The upgraded treatment process now includes:

  • 6mm rotary screening
  • Primary settlement tanks
  • MBBR biological treatment
  • Final polishing via a Copa brush clarifier

All supported by a compact GRP kiosk housing blowers and control systems.

The Result

Despite the logistical constraints, the outcome has been clear:

  • Ammonia levels successfully reduced, achieving discharge compliance
  • A reliable, efficient biological process now underpins the site
  • Installation delivered without compromising the surrounding environment

What could have been a major barrier - limited access - became a driver for smarter, more flexible engineering.

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