Samples were diluted with deionised water to ensure that the VFA results stayed within the measurable limits of concentrations of 5000 mg/l for acetic acid and 1000 mg/l for all other VFAs. All measurements were conducted in duplicate
Sampleswere diluted with deionised water to ensure that the VFA resultsstayed within the measurable limits of concentrations of5000 mg/l for acetic acid and 1000 mg/l for all other VFAs. All measurementswere conducted in duplicate