Fig. S.2 & Fig. S.3 Valorization of agrowaste digestate via addition of wood ash, acidification, and nitrification|农业废弃物处理数据集|环境科学数据集

(a) pH of the 17.17 ± 2.56 mL WS extract and masses of the (b) WS and (c) WI fractions during the 144-h incubation of the destructive samples of HCl-WFA+PVWD, HCl-WFA+HCl-PVWD, PVWD, and HCl-PVWD (n = 4). The hydrolytic and dehydration effects of the acidification could be seen in the mass of WS and WI fractions of the blend. In this way, the acidified digestate (HCl-PVWD) had more WS fraction than the PVWD alone (https://doi.org/10.1016/j.eti.2022.102632). On the other hand, a greater drop in the amount of WI material recovered could be seen in the blend HCl-WFA+HCl-PVWD, which was more severely acidified than the blend HCl-WFA+PVWD. According to the two-way ANOVA test (p < 0.05), even for the blends HCl-WFA+HCl-PVWD and HCl-PVWD there was significant difference in terms of pH. The best combinations of the PVWD with the hydrochloric acid and the wood fly ash (WFA) were tested (https://doi.org/10.1016/j.eti.2022.102632), with the doses 20 mol H+-HCl/kg WFA and 0.20 mol H+-HCl/kg PVWD. The isolation of the WS and WI fractions was done via 5-minute centrifugation at 4,000 rpm, and subsequent 3-µm filtration of the supernatant. Before measuring the weight of the total WI material, both the pellet that remained in the tube and the filter cake were dried at 70 ºC until reaching constant weight. The measurement of WS extract pH was performed with a Mettler Toledo® Seven CompactTM S220 pH/Ion meter.Description