Dry anaerobic digestion of lignocellulosic and protein residues

Abstract

HIGHLIGHTSAD digestion/co-digestion of wool and wheat straw were evaluated with TS contents of between 6 to 30%.Methane yield of wheat straw was highest at TS of 21% and lowest at TS of 30%.Methane yield of wool textile was highest at TS of 13% and lowest at TS of 30%.The addition of enzyme on wool and wheat straw led to improvement in methane yield at TS of 13%.Synergetic effects were observed when these substrates were co-digested. Utilisation of wheat straw and wool textile waste in dry anaerobic digestion (AD) process was investigated. Dry-AD of the individual substrates as well as co-digestion of those were evaluated using different total solid (TS) contents ranging between 6 to 30%. Additionally, the effects of the addition of nutrients and cellulose-or protein-degrading enzymes on the performance of the AD process were also investigated. Dry-AD of the wheat straw resulted in methane yields of 0.081 -0.200 Nm 3 CH4/kgVS with the lowest and highest values obtained at 30 and 21% TS, respectively. The addition of the cellulolytic enzymes could significantly increase the yield in the reactor containing 13% TS (0.231 Nm 3 CH4/kg VS). Likewise, degradation of wool textile waste was enhanced significantly at TS of 13% with the addition of the protein-degrading enzyme (0.131 Nm 3 CH4/kg VS). Furthermore, the co-digestion of these two substrates showed higher methane yields compared with the methane potentials calculated for the individual fractions at all the investigated TS contents due to synergetic effects and better nutritional balance. © 2015 BRTeam. All rights reserved. Kabir et al. / Biofuel Research Journal 8 (2015) [309][310][311][312][313][314][315][316] Please cite this article as: Kabir M.M., Taherzadeh M.J., Sárvári Horváth I. Dry anaerobic digestion of lignocellulosic and protein residues. ARTICLE INFO ABSTRACT

Modelling of the anaerobic semi-continuous co-digestion of sewage sludge and wine distillery wastewater

“…6 and 49.9% for SS and 52.7 and 56.7% for SS:WDW for OLR ≤ 3.2 (kg VS /m 3 •d).digestion system has proven to be stable under the operating conditions studied here. In Table3, VS/TS ratios are also shown, obtaining on average 61.4% ± 2.0 and 71.2 ± 1.3% for SS:WDW and SS, respectively.…”

“…However, sewage sludge (SS) organic load values undergo high variations and are often not sufficient for an economically effective operation 1 . Given that many of the anaerobic digesters installed in WWTP are oversized, the scientific community is paying close attention to simultaneous anaerobic co-digestion (ACoD) of SS and other types of waste aimed to promote the biodegradability of the feedstock and hence to enhance biogas production [6][7] . The main advantages of ACoD include: shared treatment facilities, reduced investment and operating costs, buffering of the variations in the composition of the waste over time and the diluting of toxic compounds and cytotoxic inhibitors.…”

Dry Anaerobic Digestion of Food and Paper Industry Wastes at Different Solid Contents

“…Moreover, PW has a low content of nitrogen (N), which results in a very high C/N ratio of 807. Therefore, the buffering capacity was low and as such the microorganisms needed an adaptation period to develop a diverse anaerobic microflora for a good anaerobic digestion process [46].…”

Co-Digestion of Grape Marc and Cheese Whey at High Total Solids Holds Potential for Sustained Bioenergy Generation

“…However, liquid digestions require substantial reactor sizes, large volumes of water and additional financial costs for continual sludge heating and mixing [29,30]. In contrast, SS-AD systems have proven more effective in the treatment of lignocellulosic material than their liquid-based counterparts [31][32][33]. One explanation is that the characteristic solid organic matrices of SS-AD systems, including humidity content, closely mimic the natural habitat of microorganisms for growth and metabolism [34].…”