Pasteurisation of Sewage Sludge
The use of Submerged Combustion (S.C) Technology to carry out the pasteurisation of sewage sludge is not a new idea.
This method was tried and proven to work very effectively during the 1980?s and early 1990?s. Using the basic principals associated with the early units, Thorpe Engineering Consultants (TEC) has redesigned the mechanical, process and control aspects of the system to create a reliable low maintenance unit with exceptional fuel economy and low whole life costs.
Benefits
- S.C heats, pasteurises & conditions sewage sludge
- Can be installed pre-digester or post-digester
- If installed pre-digester the increased sludge conditioning promotes a more rapid rate of digestion giving reduced digester residence time thus effectively increasing digester capacity
- Operates primarily on Biogas with Natural gas or LPG as a supplementary fuel in case of low biogas level
- Easily retrofitted
- Significant Whole Life Cost savings over other pasteurisation methods
- Easy to operate
- Low operating and maintenance costs
- Heating efficiency - ~ 80% at 70°C
- MAD can be achieved in less than 13 days
- Strips out H2S, VOC?s and Ammonia
- Destroys Nocardia bacteria which causes digester foaming
- Produces a final quality sludge to meet USEPA class A standards
A pasteurisation system and steel digester on a small sewage works