Hi
Your work is very interesting, I'm just curious as to whether the effluent stream from pulp and paper mills which contain lignocellulosic biomass is being investigated as an option for an AD biorefinery?
Regards
Charlotte Wessels
Thank you for your response, can you point me in the direction of this research?
Hi
We carry out research only the cleaning of mine and open-pit mine wastewater treatment by filtration through rock dumps
According to my/our full-scale experience in pulp & paper wastewater treatment the lignin (brownish colour) is not/barely removed in high-rate AD.
Instead we adsorb and biodegrade lignin downstream on regenerated activated sludge in our advanced activated sludge process.
Bruno, thanks for your answer, I was looking for a way to remove the lignin from the AD digestate for further processing. Can you give me more info on your process?
Thanks
Hello Charlotte,
Basically it is a standard (continuous or SBR) activated sludge system (retrofit) upgraded with a contact step (selector) at the inlet/feed and a regeneration step of the settled/recycled activated sludge after clarification (RAS in continuous system). This setup boosts the adsorption capacity of the biosludge and enhances the hydrolysis of the recalcitrant compounds previously adsorbed on (and enmeshed in) the biosludge flocs. In this way we achieve ultralow residuals (COD, turbidity, SDI, ...) even compared to well designed MBR's. We develop and apply our AS+(tm) process at full scale over the last 30 years. If interested I can send you more information via email.
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