Hulland Ward Waste Water Treatment Works is owned and operated by Severn Trent Water, serving a population of approximately 900 people. The system was originally constructed in the 1960s comprising a conventional biological filtration system in the form of a primary settlement tank, trickling filter and humus tanks. The ageing infrastructure became unsustainable, demanding increasing energy consumption and OPEX to maintain compliance with regulatory discharge limits. Severn Trent Water required a new low cost, low energy and low carbon solution to replace the de-commissioned works, that could operate in a rural setting treating flows of 492 m3 d-1 and meet final effluent discharge concentrations of 30 mg L-1 BOD5, 50 mg L-1 suspended solids and 15 mg L-1 ammonia.