An automated tool that allows operators to maximize biogas output and reduce incidents of overfeeding and system collapse.
Bacteria in anaerobic digesters require a pH-value in the range of about 6.5 to 8 to efficiently produce biogas. Stabilization of the pH-value within this range is predominantly obtained by the release of large amounts of bicarbonate from the anaerobic decomposition of organic wastes.
Process interruptions such as overfeeding often result in increased concentrations of volatile fatty acids (VFA) and to decreasing amounts of bicarbonate as these acids consume the bicarbonate and in extreme cases, even leading to biological collapse and plant failure.
Monitoring the bicarbonate values in the digester is a reliable and accurate tool for determining feeding rates.