Aerated Reed Beds

Predictive modelling and reed bed design and build

Location

Hampstead Norreys WwTW for Thames Water

Project Type

Design and build of an Aerated Reed Bed System for tertiary treatment using NWS predictive modelling.Completed April 2017

Need

Hampstead Norreys WwTW is a traditional filter works servicing a population of 30,000 plus industrial. Over time there has been an increase in population served and the ammonia consent has been tightened. The existing treatment works was already running at almost full capacity and so further infrastructure was required, to both deal with the change in ammonia consent and provide some flexibility in the plant operation.

Solution

Following NWS predictive modelling using Biowin, the client was satisfied that the proposal made good sense.This competence was used to upgrade the plant with an aeratedreed bed system which followed the predicted performancevery accurately. The new system comprises blowers, two aerated reed beds and electrical control system. The reed beds are simple to maintain and operate and the fully automatic control system for the blowers saves energy and gives greater efficiency.The plant is able to cope with diurnal and seasonal changes in throughput and meets the consent of 20:30:3 with ease, aspredicted by the NWS modelling.