Sam, we did a comparison on ...

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Sam, we did a comparison on mesophilic, TPAD, thermophilic operating  conditions on a live plant in Scotland. We ran a trials to identify the benefits with regard to biogas production, and log reduction of E-coli. If the drive is to increase gas production, we did not see a significant difference, especially when you consider the additional energy required to maintain >50 Degrees C. However if the driver is sludge stabilization and greater reduction of E-coli the in higher temp allowed us to meet our land application requirements. We had no issues with foaming of the digester when ramping up or reducing the temperatures. The main downside with TPAD in my view is exactly why you are asking the question, it is not as established and understood process, thus a certain amount of scepticism of it. I would stick with either meso or thermo as your conditions dictate to keep it simple.

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Hi Paul ,Thanks for the answer. I myself involved in one of the TPAD commissioning project these days and system is working well so far and reduce risk of foaming with more VSD reduction is something we expect also with less HRT requirement compared with Meso. It would be difficult to stop being sceptical about this process unless it is proven in many installations. 

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