Anaerobic co-digestion of the marine microalga Nannochloropsis salina with energy crops

Batch anaerobic co-digestion of waste activated sludge and microalgae (Chlorella sorokiniana) at mesophilic temperature

“…A decrease in the kinetic constant from 0.36 ± 0.01 to 0.27 ± 0.01 days was achieved. [15] In the same way, these kinetic constant values were also much higher than that reported recently for the anaerobic co-digestion of WAS with lipid-spent Botryococcus braunii (at 75%/25% and 50%/50%: 0.071±0.006 and 0.097±0.007 days -1 , respectively).…”

“…[6] A possible explanation for the synergetic effect of co-digesting WAS with microalgae when algal fraction is at low concentrations in the mixture is the enhanced alkalinity that the microalgae bring to the co-digestion, which showed a better process stability and enhanced methane yield by microalgae addition. [15] In addition to that, when the percentage of microalgae is high (50% and 75%) the methane yields decreased, 7 which can be attributed to the hemicellulosic cell wall of this microalga, which present a high resistance to anaerobic bacterial degradation. [5] It has been also recently reported that the anaerobic co-digestion of Chlorella sp.…”

Anaerobic Co-digestion of the Energy Crop Sida hermaphrodita and Microalgae Biomass for Enhanced Biogas Production

“…and Scenedesmus sp. The positive synergy effects observed in co-digestion due to the balancing of parameters in the co-substrate mixture may offer a potential for higher methane yields (Mata-Alvarez et al 2000;Schwede et al 2013). In our study, co-digestion of energy crop Sida with microalgae biomass improved biogas and methane production.…”

“…600 mL biogas/g VS). Microalgae biomass addition to corn silage with a ratio of 1/6 increased biogas yield by about 9% to 660 m 3 /kg VS compared to the monodigested crop feedstock (Schwede et al 2013). However, there are no published data on co-digestion of Sida (Sida hermaphrodita) energy crop with microalgae biomass.…”

“…However, energy crop production on arable lands competes with global food and feed supply (Schwede et al 2013;Jankowski et al 2016). Consequently, there is a need for searching the non-food plant species to rebalance the support of bioenergy and biofuels versus food feedstock use.…”