||Charis at Work.....Anaerobic
digestion is a series of processes in which micro-organisms break down
biodegradable material in the absence of oxygen. One major application is in
the treatment of waste water but it is increasingly finding use in other fields
where the breakdown of almost any organic material can be processed with
anaerobic digestion. This includes biodegradable waste such as paper, grass
clippings, leftover food, sewage and animal waste. The biogas produced by the
process can be harnessed to power generating and heating plants, while the
liquid and solid residue can be used to replace chemical fertilisers. The major
benefits of anaerobic digestion includes the reduction of material sent to
landfill sites, and the reduction of ozone-layer damaging methane escaping to
The digestion process creates foam which needs to be
controlled. By using a Charis Foam Control
System a considerable saving in antifoam costs can be made as the
system continuosly monitors the level of foam within the digester and adds
antifoam only when required. Additionally if the level of foam is kept to a
minumum a greater level of through-put is possible. Our work in this field with
companies such as Southern Water, Thames Water and Anglian Water has proved
that we are able to reliably meet both of these criteria.
This diagram shows a typical Charis Foam Control System for a
foam sensor is inserted through the digester roof through an isolating valve.
The adjustable fitting allows the sensor to be moved to the correct depth to
suit the process. By using the isolating ball valve it also allows for the
removal of the sensor for maintenance.
As anaerobic digesters are classed as hazardous areas the sensor
is connected to the foam and liquid controller via a Zener barrier. The
controller is in turn connected to the client's own process controller or an
|Anaerobic digestion is a
very dirty process causing much fouling of the foam probe. In some systems this
would cause the system to stop working but thanks the Charis's unique IMA®Sensing technology the Charis
system will continue to work even under the severest fouling conditions.
Charis Technology products are designed
to provide a cost effective solution to foam control in an environmentally
friendly manner. Charis Technology is a member of ADBA, the trade
association for the Anaerobic Digestion and Biogas industries.
If you feel that Charis Technology
could help you control your foam problems in a cost effective and reliable
manner please contact
Technology - Striving for excellence