Hi all, We had to face such a problem and we have positively dealt with in managing a "buffer reaction" (week acid / week base) producing acetates The more efficient and cost effective reactor agent was acetic acid This shall be done with proper doses at the acidogenic stage. Regards
e.venture Ltd Jean-luc Sallustro Managing Partner 42, Quartier du Baobab, Labourdonnais, Mapou, Ile Maurice Tel (230)266 94 94 Mob (230) 250 83 36 On 08/31/2012 06:03 PM, Alexander Eaton wrote: > Dear List, > > Yesterday I was visiting a handful of "problem" digesters to help get them > back on track. The issues is almost always acidity due to overloading > (either stemming from too much waste, not enough water, or dropping > temperatures), and a big dilution, some bicarbonate, and a new "seeding" > from another nearby system is almost always the fix. > > However, yesterday I went to a system that had a pH of 7.2 (in the range of > OK), but was producing almost no gas. I checked everything before I > decided to check the pH of the irrigation water from a deep well they used > with the waste. It had a pH of 8.6. That was the most alkaline reading I > had seen in input water, which must indicate it is highly mineralized. > This pH seems out of a healthy range for AD, but there is no other water > source. So, two questions: > 1. Please confirm that input water with such high alkalinity could be > inhibiting the AD process, and; > 2. What could be done to cost effectively (eg no cost) lower the > alkalinity, or at least the impact on the AD process. > > I had them start using less water, arriving at the lowest possible dilution > levels for the cow manure, hoping that less water would mean less > inhibition of the process. Thought? > > Best > > > > _______________________________________________ > Digestion mailing list > > to Send a Message to the list, use the email address > [email protected] > > to UNSUBSCRIBE or Change your List Settings use the web page > http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org > > for more information about digestion, see > Beginner's Guide to Biogas > http://www.adelaide.edu.au/biogas/ > and the Biogas Wiki http://biogas.wikispaces.com/ >
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_______________________________________________ Digestion mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org for more information about digestion, see Beginner's Guide to Biogas http://www.adelaide.edu.au/biogas/ and the Biogas Wiki http://biogas.wikispaces.com/
