Thank you for clarifying, this makes more sense. I agree with John that you shouldn't have to worry about the chlorine, because the small residuals affect on the digester sludge will be negligible. I too have not heard of any studies into the effect polymer has on biogas production. Here in the US, we often thicken sludge prior to anaerobic digestion to increase the solids throughput capacity of the digesters. The thickening processes include polymers. Like I said above, I haven't heard of any studies on the effect polymer has on anaerobic degradation, but I would venture to say that there isn't a large enough effect for anyone to take notice and decide to run some pilots. If you do run any tests, I'd be interested in seeing the results.  Sounds like you may be thinking of a dry anaerobic digestion technology for the biogas facility if you will be feeding dewatered sludge. If the sludge isn't hydrolysed prior to a liquid anaerobic digester, the solids feed would be capped around 5-7%, due to pumping and mixing limitations. I'd guess you currently dewater sludge to 15-30% solids.  Sounds like a cool project, where is the project located in South Africa?

Published March 15, 2017 16:51 by Thomas Nangle