Effect of Pretreatments on the Semicontinuous Anaerobic Digestion of Sunflower Heads

Polat, Hakan; Selçuk, Nevín; Soyupak, Selçuk

doi:10.1080/00908319208908735

Cited by 4 publications

(7 citation statements)

References 2 publications

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“…However, when compared to the yields they obtained at a dose of 5 NaOH 100 g −1 TS, the yields were 20% higher (0.249 L biogas g −1 vs. and 0.154 L CH 4 g −1 VS). It should be noted, that the solid concentration of the feeding slurry in Polat et al [19] was lower (2%) than in this work (4.6%). Although the NaOH dose was a little higher (5 NaOH 100 g −1 TS) than the dose used in CSTR2 (4 NaOH 100 g −1 TS), the feeding in Polat et al [19] contained less TS which may have induced a lower concentration of inhibitors.…”

Section: Sunflower Residues Collection and Pretreatmentcontrasting

confidence: 69%

“…It should be noted, that the solid concentration of the feeding slurry in Polat et al [19] was lower (2%) than in this work (4.6%). Although the NaOH dose was a little higher (5 NaOH 100 g −1 TS) than the dose used in CSTR2 (4 NaOH 100 g −1 TS), the feeding in Polat et al [19] contained less TS which may have induced a lower concentration of inhibitors. Moreover, the pretreatment in Polat et al [19] was conducted at even milder conditions with respect to temperature.…”

Section: Sunflower Residues Collection and Pretreatmentcontrasting

confidence: 69%

“…The residues were separated into stalks and heads after seed removal. The heads and In another work, Polat et al [19] studied the methane production of a lab-scale fermenters fed with a slurry (2% TS w/v) of alkali-pretreated sunflower heads (2 and 5 g NaOH 100 g −1 TS, 24 h, ambient temperature) at various HRTs (8−15 d) at thermophilic conditions. They found a positive effect of the alkaline pretreatment.…”

Section: Sunflower Residues Collection and Pretreatmentmentioning

confidence: 99%

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Biogas Production from Sunflower Head and Stalk Residues: Effect of Alkaline Pretreatment

et al. 2019

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Sunflower residues are considered a prominent renewable source for biogas production during anaerobic digestion (AD). However; the recalcitrant structure of this lignocellulosic substrate requires a pretreatment step for efficient biomass transformation and increased bioenergy output. The aim of the present study was to assess the effect of alkaline pretreatment of various parts of the sunflower residues (e.g., heads and stalks) on their methane yield. Experimental data showed that pretreatment at mild conditions (55 °C; 24 h; 4 g NaOH 100 g−1 total solids) caused an increase in the biochemical methane potential (BMP) of both heads and stalks of the sunflower residues as determined in batch tests. The highest methane production (268.35 ± 0.11 mL CH4 g−1 volatile solids) was achieved from the pretreated sunflower head residues. Thereafter; the effect of alkaline pretreatment of sunflower head residues was assessed in continuous mode; using continuous stirred-tank reactors (CSTRs) under two operational phases. During the first phase; the CSTRs were fed with the liquid fraction produced from the pretreatment of sunflower heads. During the second phase; the CSTRs were fed with the whole slurry resulting from the pretreatment of sunflower heads (i.e., both liquid and solid fractions). In both operating phases; it was observed that the alkaline pretreatment of the sunflower head residues had a negligible (phase I) or even a negative effect on biogas production; which was contradictory to the results of the BMP tests. It seems that; during alkaline pretreatment; this part of the sunflower residues (heads) may release inhibitory compounds; which induce a negative effect on biogas production in the long term (e.g., during continuously run digesters such as CSTR) but not in the short-term (e.g., batch tests) where the effect of the inoculum may not permit the inhibition to be established.

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Section: Sunflower Residues Collection and Pretreatmentcontrasting

confidence: 69%

Section: Sunflower Residues Collection and Pretreatmentcontrasting

confidence: 69%

Section: Sunflower Residues Collection and Pretreatmentmentioning

confidence: 99%

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Biogas Production from Sunflower Head and Stalk Residues: Effect of Alkaline Pretreatment

et al. 2019

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“…The effect of HRT on the steady-state methane production rate was significant in pretreated slurries, and the measured steady-state rates were in good agreement with the predictions of the related kinetic model. The same process system was employed for the digestion of sunflower heads, the most readily available crop residue with high volumes of production (Polat et al, 1992(Polat et al, , 1993. The methane content of the gas increased with increasing reten-tion time, although both gas production and methane production rates decreased.…”

Section: Alternative Energy Sourcesmentioning

confidence: 99%

Biotechnological Developments in Turkey

Özcengiz

1996

Critical Reviews in Biotechnology

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Turkey is a country not usually associated with industrial biotechnology. However, when current research potential in universities and other R & D centers and particularly contributions made to the international literature since the mid-1980s are taken into account, high-quality international-level work is now commonplace, especially in areas such as industrial microbiology, enzyme technology, biomaterials and biological wastewater treatment. Work in plant biotechnology is at a relatively early stage, but is expected to become a rapidly developing force in the near future. The present article documents current potential in Turkey, based on significant publications produced during the last 8 years.

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“…Methane concentrations in the biogas exceeded 80% for the entire test period. Polat et al (1992Polat et al ( , 1993 studied biogas production in a series of laboratory scale anaerobic digestion experiments on waste sunflower heads. The study involved varying hydraulic retention times and alkali pretreatment dosages.…”

mentioning

confidence: 99%