Regarding the subject, I haven't done any research on it. I believe there is someone with the same name and surname.

Besides chemical dosing, the pH of a small-scale biodigester could be automated naturally and mechanically. Co-digestion with pH-stabilising materials, such as crop residues, wood ash, and crushed eggshells, can offset acidity. Recycling digested faecal slurry (effluent) back into the inlet is another source of natural buffering and seeding of active bacteria. Slow-release buffers, such as crushed limestone or dolomite, are also helpful. A cost-effective pH sensor read by a microcontroller (e.g. Arduino) can be used to prompt actions such as stirring to pause feeding or to add natural buffer substances. Regular feeding schedules help avoid excess acid accumulation in the stomach. Taken together, these approaches generate an environmentally robust matrix and minimise the chemical demand over the lifetime of the biodigester.