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Aerobic Sludge Digestion (ASD) can be used to reduce waste sludge biosolids, in both secondary and primary sludges. Oxy-Dep SD, an ASD process enhanced by the use of high purity oxygen, allows the following:

 
partial disinfection and pathogen kill by operation at thermophilic temperatures (45 - 65°C)
   
the production of a stable sludge with excellent dewatering properties
   
much reduced digester retention times (and so smaller digester volumes) compared with conventional aerated ASD or anaerobic digestion
   
good process control to reduce odours, VOCs and foam.
   
The process is used widely in municipal and industrial sludge applications.
 
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