Balhall WwTW

Constructed Wetlands: Groundwater Treatment Plants (GWT)

Created at: 25 Aug 2016

Description

Needs<br>The wastewater treatment works at Balhall is operated by Scottish Water and serves a small hamlet and farm in Angus near Brechin. The site originally comprised a septic tank which discharged into a local stream. Subsequently a passive vertical flow reed bed system was installed post septic tank but this struggled to but achieve the tight ammonia consent of 5mg/l. <br><br>Solution<br>The existing treatment wetland comprised a two reed bed system operating in parallel. ARM Ltd were keen to maximise the use of this existing asset. Because of the stringent ammonia consent and the need for a process guarantee an aerated (FBATM), two stage saturated vertical downflow system operating in series was proposed. This was constructed by conversion of one of the existing reed beds on site, creating two beds of 171m2 and 25m2 with a pumping chamber in between. ARM Ltd also installed a new septic tank specifically sized to handle the higher flows associated with roof water catchment and avoid the scouring of solids. Duty standby blowers were installed with a control panel allowing timer controlled operation of the aeration system.

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