Enhancement of anaerobic digestion of microcrystalline cellulose (MCC) using natural micronutrient sources

Abstract

-The effect of adding four minerals as micronutrient sources to stimulate the anaerobic process of microcrystalline cellulose (MCC) was investigated. Three mineral doses (5, 10 and 15 mg/L) were evaluated and the response to trace metal addition was monitored by the methane yield (Y CH4 ) and specific methanogenic activity (SMA). A clear stimulation of the Y CH4 and SMA on MCC due to the presence of minerals with a high content of trace elements was observed, respectively: the Y CH4 and SMA of the sludge with 5 mg/L of high-Fe-Mg mineral increased to 397 NmLCH 4 /gVS substrate and 0.267 gCOD NmLCH4 /gVS inoculum /d compared to 303 NmLCH 4 /gVS substrate and 0.205 gCOD NmLCH4 /gVS inoculum/ d in a medium without adding mineral. An increase in the doses of high-Ca mineral highly decreased methane production and process stability, due to a possible inhibition of the anaerobic digestion by calcium ions.

High-rate anaerobic co-digestion of kraft mill fibre sludge and activated sludge by CSTRs with sludge recirculation

“…There are several reports on the antagonistic relationship between cations, for example between Na + and Mg 2+ (Ahring et al, 1991) , Na + to Mg 2+ or Ca 2+ (McCarty and McKinney, 1961), or the antagonistic effects of combinations of cations (Kugelman and McCarty, 1965). In a study by Suárez et al (2014), microcrystalline cellulose was digested in the presence of four different mineral mixtures. The mineral mixture with a high Ca content and a high Ca:Mg ratio showed a reduced methane production, while the mineral mixture with a high Ca content but lower Ca:Mg ratio improved the methane production.…”

Bioavailability and dosing strategies of mineral in anaerobic mono‐digestion of maize straw

“…Others research on trace elements supplementation in mono-digestion of straw and silage with the goal to enhance the performance and stability of the process [2,3,5]. However, in recent studies, the trace metals supply from natural mineral has demonstrated to have a similar effect during the biodegradation of microcrystalline cellulose (synthetic model substrate) and maize straw in batch and semi-continuous experiments, respectively [10,11]. The previous data resulted from addition of trace metals in form of salts.…”

“…The previous data resulted from addition of trace metals in form of salts. However, in recent studies, the trace metals supply from natural mineral has demonstrated to have a similar effect during the biodegradation of microcrystalline cellulose (synthetic model substrate) and maize straw in batch and semi-continuous experiments, respectively [10,11]. From their findings, the highest methane yield of 397 and 257 mL CH 4 g −1 VS, were obtained in the AD of microcrystalline cellulose and maize straw, respectively, with mineral addition, which was 31% higher than that the substrates without mineral supply.…”

Biogas Production Potential in Anaerobic Digestion of Swine Manure With Different Solid Fraction Concentrations and Temperatures

“…2017 stages is the anaerobic biodigestion (HALMEMAN et al, 2014;. It is a process decomposition of organic matter by different groups of microorganisms in the absence of free molecular oxygen which results in two main sub-products: biogas and biofertilizer (KLEINSTEUBER 2014;SILVA et al, 2013;SUÁREZ et al, 2014). The first may be used as biofuel in the generation of electric and / thermal power and the second in the organic fertilization of the soil, thereby generating value-added products (GALBIATTI et al, 2010;RODRIGUEZ-VERDE et al, 2014).…”