||Charis at Work.....Municipal Waste
Municipal waste water in the UK is often treated
by using Anaerobic Bio-digesters, which are essentially very large fermenters,
to reduce the volume and mass of the inflow. As methane is produced as part of
the process the digesters are classed as hazardous areas and require equipment
to ATEX (Explosive Atmospheres) specification. The organism used in the
digesters is, in some cases, prone to generate foam, which can cause problems
including 'foam-overs' which require a lot of work and expense to clear up.
Working with various Water Authorities in the UK, Charis Technology has
developed a Foam Control system consisting of an adjustable foam sensor which
enters the digester vessel through a special fitting with an isolating valve.
The sensor is connected to a Charis Foam Controller via a zener barrier, and
the Controller is interfaced into the client's own system. The benefits in
savings in antifoam, increased efficiency of the process and saving of staff
time has been significant.To see a short Powerpoint presentation showing basic
foam control in a digester click here (opens in new window). For further details see
our application section on Anaerobic
Another area where
Charis Foam Control Systems have found use is in the centrifuge process for
removing liquid from the residual solids in waste water processes. The action
of the centrifuge pump creates foam which again can be effectively controlled
using Charis foam technology.
Charis Foam Tendency Analyser has the
ability to predict the formation of foam by continually sampling a process. It
is particularly useful in areas where space is limited or regular access is
difficult. Once the production of foam is predicted the FTA can inject antifoam
using its own integral pump, or it can signal the client's process controller
to add antifoam.
If you feel that Charis Technology could help you
control your foam problems in a cost effective and reliable manner please
- Striving for excellence