Your browser is no longer supported

For the best possible experience using our website we recommend you upgrade to a newer version or another browser.

Your browser appears to have cookies disabled. For the best experience of MRW, please enable cookies in your browser

We'll assume we have your consent to use cookies, so you won't need to log in each time you visit our site.
Learn more

AD autoclave at the double

Autoclave designer and manufac­turer AeroThermal Group has claimed that the throughput of anaerobic digestion (AD) plants could double with use of an auto­clave.

Its research finds that pre-treat­ing food waste with the technol­ogy – which subjects it to stream and pressure – can boost through­put while reducing ammonia con­centrations.

The company, which has been running trials for 18 months, found that digester performance was maximised when the autoclave operated at 140°C and the digesters were run at an organic loading rate of more than 5kgVS/cu m/day.

Stable operations have been achieved at a loading rate as high as 10kgVS/cu m/day with food waste autoclaved at 140°C, while un-autoclaved feedstock digesters entirely failed at a loading rate of 5kg VS/cu m/day.

AeroThermal said the increases in digester performance can be attributed to the denaturing of protein during autoclaving pre-treatment, which has the effect of reducing the quantity of ammonia generated.

The company believes that AD plant operators could potentially double revenues for only a mar­ginal increase in operating costs since the autoclave uses waste heat from the combined heat and power process.

Have your say

You must sign in to make a comment

Please remember that the submission of any material is governed by our Terms and Conditions and by submitting material you confirm your agreement to these Terms and Conditions. Links may be included in your comments but HTML is not permitted.