Anaerobic biodegradation of spent sulphite liquor in a UASB reactor

Jantsch, Tor Gunnar; Angelidaki, Irini; Schmidt, Jens Ejbye; Hvidsten, B.E. Braña de; Ahring, Birgitte Kiær

doi:10.1016/s0960-8524(02)00021-4

Cited by 28 publications

(17 citation statements)

References 16 publications

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“…16 To reduce make-up water requirements, plant waste water is screened to remove large particles, and then delivered to a sequence of anaerobic and aerobic digesters to digest organic material contained in the waste water. Anaerobic diges- 45,46,47 though at lower rates (e.g., 28-58% 47 ) than assumed here.…”

Section: Energy Recovery and Waste-water Treatmentmentioning

confidence: 72%

Coproduction of ethanol and power from switchgrass

Laser

Jin²,

Jayawardhana³

et al. 2009

Biofuels Bioprod Bioref

108

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Three process designs for producing ethanol and electricity from switchgrass are evaluated: a basecase technology scenario involving dilute acid pre-treatment and simultaneous saccharifi cation and fermentation, and two mature technology scenarios incorporating ammonia fi ber expansion pre-treatment and consolidated bioprocessing -one with conventional Rankine power coproduction, and one coproducing power via a gas turbine combined cycle. Material and energy balances -resulting from detailed Aspen Plus models -are reported and used to estimate processing costs and perform discounted cash fl ow analysis to assess plant profi tability. The mature technology -designs signifi cantly improve both process effi ciency and cost relative to base-case cellulosic ethanol technology, with the resulting fossil fuel displacement being decidedly positive and production costs competitive with gasoline, even at relatively low prices.

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Section: Energy Recovery and Waste-water Treatmentmentioning

confidence: 72%

Coproduction of ethanol and power from switchgrass

Laser

Jin²,

Jayawardhana³

et al. 2009

Biofuels Bioprod Bioref

108

View full text Add to dashboard Cite

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“…AD total had a maximum of 36% on day 71, which corresponded to the maximum value of SCOA concentration obtained. The reason for the relatively low AD total could be explained by the majority of the COD present in the feed being constituted by phenolic compounds, LS, and other recalcitrant compounds, which are more difficult to biodegrade than sugars by the microbial population [38].…”

Section: Acidification Degreementioning

confidence: 99%

Valorization of a Pulp Industry By-Product through the Production of Short-Chain Organic Acids

et al. 2017

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Abstract:In this work, hardwood sulfite spent liquor (HSSL)-a by-product from a pulp and paper industry-was used as substrate to produce short-chain organic acids (SCOAs) through acidogenic fermentation. SCOAs have a broad range of applications, including the production of biopolymers, bioenergy, and biological removal of nutrients from wastewaters. A continuous stirred tank reactor (CSTR) configuration was chosen to impose selective pressure conditions. The CSTR was operated for 88 days at 30 • C, without pH control, and 1.76 days of hydraulic and sludge retention times were imposed. The culture required 46 days to adapt to the conditions imposed, reaching a pseudo-steady state after this period. The maximum concentration of SCOAs produced occurred on day 71-7.0 g carbon oxygen demand (COD)/L that corresponded to a degree of acidification of 36%. Acetate, propionate, butyrate, valerate, and lactate were the SCOAs produced throughout the 88 days, with an average proportion of 59:17:19:1.0:4.0%, respectively.

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“…It contains hemicellulose-derived sugars at a typical concentration of 3-4%, sugar degradation products (such as furfural and HMF), weak acids (primarily acetic acid), lignosulfonates, and assorted salts (Helle et al, 2004;Smith et al, 1997). Consequently, SSL, a low-cost feedstock similar to other lignocellulosic hydrolysates in chemical profile, is widely considered and utilized as a substrate for the production of bioethanol (Helle et al, 2004;Jantsch et al, 2002;Taherzadeh et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Tolerance and adaptation of ethanologenic yeasts to lignocellulosic inhibitory compounds

Keating

Panganiban

Mansfield

2006

Biotech & Bioengineering

174

121

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Synthetic mixtures of predominant lignocellulosic hexose sugars were supplemented with separate aliquots of three inhibitory compounds (furfural, hydroxymethylfurfural (HMF), and acetic acid) in a series of concentrations and fermented by the spent sulfite liquor (SSL)-adapted yeast strain Tembec T1 and the natural isolate Saccharomyces cerevisiae (S. cerevisiae) Y-1528 to compare tolerance and assess fermentative efficacy. The performance of Y-1528 exceeded that of Tembec T1 by a significant margin, with faster hexose sugar consumption, higher ethanol productivity, and in the case of furfural and HMF, faster inhibitor consumption. Nevertheless, furfural had a dose-proportionate effect on sugar consumption rate and ethanol productivity in both strains, but did not substantially affect ethanol yield. HMF had a similar effect on sugar consumption rate and ethanol productivity, and also lowered ethanol yield. Surprisingly, acetic acid had the least impact on sugar consumption rate and ethanol productivity, and stimulated ethanol yield at moderate concentrations. Sequential iterations of softwood (SW) and hardwood (HW) SSL were subsequently inoculated with the two yeast strains in order to compare adaptation to, and performance in lignocellulosic substrates in a cell recycle batch fermentation (CRBF) regime. Both strains were severely affected by the HW SSL, which was attributed to specific syringyl lignin-derived degradation products and synergistic interactions between inhibitors. Though ethanologenic capacity was preserved, a net loss of performance was evident from both strains, indicating the absence of adaptation to the substrates, regardless of the sequence in which the SSL types were employed.

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Anaerobic biodegradation of spent sulphite liquor in a UASB reactor

Cited by 28 publications

References 16 publications

Coproduction of ethanol and power from switchgrass

Coproduction of ethanol and power from switchgrass

Valorization of a Pulp Industry By-Product through the Production of Short-Chain Organic Acids

Tolerance and adaptation of ethanologenic yeasts to lignocellulosic inhibitory compounds

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