Volatile Acidtoalkalinity Ratio

The range of acceptable volatile acid-to-alkalinity ratios is 0.1-0.2. An acceptable ratio may be obtained by adjusting volatile acid concentration, alkalinity concentration, or both concentrations. Reducing or terminating feed sludge to the digester also helps to lower the volatile acid-to-alkalinity ratio. If feed sludge cannot be reduced or terminated, the use of chemicals for alkalinity adjustment is required. An unacceptable volatile acid-to-alkalinity ratio is usually the first warning of...