Skip to main content

Table 3 Parameters and analytical methods for the evaluation of the digestate

From: Anaerobic digestion of mixed silage of waterweed biomass and wheat straw in a long-term semi-continuous biogas production process

Parameter Sample pre-treatment Analytical methods
TS None DIN 12880
VS None DIN 12879
VFA/TAC Sieved Titration method according to Lili et al. [13], Burete Digital BRAND, Microprocessor pH-Meter pH 95 (WTW, Weilheim, Germany)
NH4-N Filtered DIN 38406 E5. Spektroquant® test kit (measuring range 0.01–3 mg L−1 NH4-N, Merck, Germany), photometric measurement with MultiLab P5 (WTW, Weilheim, Germany)
Acetate, propionate, butyrate Filtered HPLC (Shimadzu, Japan); detector: RID-10A; column: VA 300/7.8 Nucleogel Ion 300 OA; eluent 0.05 M H2SO4
Water-soluble elements Filtered Inductively coupled plasma atomic emission spectrometry ICP-AES (Spectroflame, Spectro Int., Kleve, Germany)