Effect of organic loading, feed-to-inoculum ratio, and pretreatment on the anaerobic digestion of tobacco stalks

Zhang, Hongyan; Wang, Ligong; Dai, Zhuangqiang; Zhang, Ruihong; Chen, Chang; Liu, Guangqing

doi:10.1016/j.biortech.2019.122474

Cited by 37 publications

(20 citation statements)

References 40 publications

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“…ISR is an important factor for the start of a balanced microbial population in anaerobic system, and an appropriate ISR is beneficial to balance the bacteria and archaea associated with the acidification and methanogenic process (Li et al, 2018;Zhang et al, 2020). A lower ISR means fewer methanogens and higher risk of VFAs inhibition, resulting in decreased biogas and methane yields (Latifi et al, 2019).…”

Section: Effects Of Zvi On the Ad Of Cow Manure Under Different Condimentioning

confidence: 99%

Effects of Adding Zero Valent Iron on the Anaerobic Digestion of Cow Manure and Lignocellulose

Men

Zheng

Zhang

et al. 2020

Front. Bioeng. Biotechnol.

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Previous studies showed that adding zero valent iron (ZVI) can increase the methane production and degradation rate of organic waste by improving the performance of anaerobic digester. However, our study firstly found that ZVI (37 µm, 10 g/L) inhibited the anaerobic digestion (AD) of cow manure and lignocellulose. ZVI significantly increased the methanogenic rate of cow manure in the first 6 days, but decreased the accumulative methane yield and volatile fatty acids yield by 10.3 and 12%, respectively. The effect of ZVI on AD of liquid biomass separated from cow manure was positive, but the effect on solid biomass was negative. These results indicated that ZVI enhanced the AD of easily biodegradable organics but inhibited the biodegradation of refractory organics (lignocellulose). By analyzing the varying effects of ZVI in diverse anaerobic systems, it was found that the effects were influenced by the characteristics of substrate and inoculum-substrate ratio. This study suggested that only proper ZVI addition can improve the AD process depending on the feeding materials.

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Section: Effects Of Zvi On the Ad Of Cow Manure Under Different Condimentioning

confidence: 99%

Effects of Adding Zero Valent Iron on the Anaerobic Digestion of Cow Manure and Lignocellulose

Men

Zheng

Zhang

et al. 2020

Front. Bioeng. Biotechnol.

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“…Song et al [24] pretreated corn straw with HCl, H 2 SO 4 and CH 3 COOH at concentrations of 1%, 2%, 3% and 4% (w/w) each and reported the highest methane yield by H 2 SO 4 and HCl at 2% concentration and CH 3 COOOH at 4% concentration. Pretreatment of tobacco stalks by Zhang et al [33] with HCl and oxalic acid (H 2 C 2 O 4 ) at 1%, 3%, 5% and 7% (w/w) concentration each revealed an increase in cumulative methane generation by 19.2% and 21% after pretreatment with 5% HCl and 7% H 2 C 2 O 4 , respectively. Pretreatment of thickened waste activated sludge with free nitrous acid (4.9-6.1 mgN/l) for 24 h enhanced methane production in a pilot-scale reactor by 37% as compared to untreated WAS [34].…”

Section: Discussionmentioning

confidence: 99%

Enhancement of biogas production from organic fraction of municipal solid waste using acid pretreatment

Dasgupta

Chandel

2020

SN Appl. Sci.

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Anaerobic digestion of organic fraction of municipal solid waste (OFMSW) is a potential and economic technique for harnessing bioenergy from Indian municipal solid waste. Pretreatment before anaerobic digestion has been known to improve biodegradability of substrate and enhance biogas production. In this study, the effectiveness of acid pretreatment in enhancing the hydrolysis of complex organic matter and ensuing biogas generation from OFMSW was studied using one strong and one weak acid. Acid pretreatment (pH 6-pH 1) of OFMSW was carried out using hydrochloric acid (HCl) and acetic acid (CH 3 COOH) for 24 h before batch anaerobic digestion assays with cow dung as inoculum. Increase in biogas yield ranged between 13.2 and 28.9% as compared to untreated OFMSW after pretreatment with HCl, whereas the same varied between 8.2 and 16% in case of CH 3 COOH pretreatment. The highest biogas yield (389.4 ml/gVS) with methane content of 68.3% was obtained after pretreatment with HCl at pH 3, whereas for CH 3 COOH, the highest yield (350.2 ml/gVS) with 67.4% methane was observed after pretreatment at pH 1. OFMSW characteristics after each pretreatment step and their variation during the course of anaerobic digestion were also studied. An economic evaluation of all pretreatment scenarios was performed; out of which, pretreatment of OFMSW with HCl at pH 4-pH 6 yielded positive results in terms of net revenue gains.

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“…The theoretical maximum methane yield (MMY) of VR was determined in accordance with Equations ) and (), while the measurement of daily biogas yield and biodegradability ( B d ) was described by Equations ) and (), respectively 16 . In these equations, Δ P corresponds to the pressure difference (kPa) of the digester with and without the emission of biogas into water and V head is defined as the headspace volume of the digester (L).…”

Section: Methodsmentioning

confidence: 99%

“…The examination of pressure was done utilizing a 3151 WAL BMP‐test system pressure gauge (WAL Mess‐und Regelsysteme GmbH, Germany). The analysis on the methane concentration in biogas was done using a 7890B gas chromatograph (Agilent) 16

\begin{matrix} lefttrue \\ {normalC}_{n} {normalH}_{a} {normalO}_{b} {normalN}_{c} + (n - 0.25 a - 0.5 b + 0.75 c) {normalH}_{2} O \\ \to (0.5 n + 0.125 a - 0.25 b - 0.375 c) {CH}_{4} \\ + (0.5 n - 0.125 a + 0.25 b + 0.375 c) {CO}_{2} + c {NH}_{3} \end{matrix}

MMY = \frac{22.4 \times 1000 \times ((), 0.5 n + 0.125 a - 0.25 b - 0.375 c)}{12 n + a + 16 b + 14 c} \times ((), 1 - lignin %)

V_{biogas} = \frac{normalΔ P \times V_{head} \times C}{RT}

B_{d} = \frac{total SMY}{MMY} \times 100 %

…”

Section: Methodsmentioning

confidence: 99%

Comparison of methane production performance of vinegar residue under liquid‐ and solid‐state conditions

Song

Feng

Wang

et al. 2020

Env Prog and Sustain Energy

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Vinegar residue (VR), a major by‐product in the vinegar brewing process, is generated at least three million tons annually in China. Currently major part of the disposal of VR is fulfilled by landfill and incineration, however, serious environment pollution along with such processes is a challenging issue. Anaerobic digestion (AD) can provide benefits of environment and renewable methane generation, which seems to be a reasonable alternative to traditional treatment. Noticeably, total solids (TS) is an important influential parameter to AD performance. Therefore, VR was evaluated for methane production and associated kinetic characteristics during the liquid‐state AD (LS‐AD) and solid‐state AD (SS‐AD) in this study. The results indicated that the highest specific methane yield of 194.8 mL gVS−1 and volumetric methane yield of 9.4 Lmethane Lreactor volume−1 were achieved in LS‐AD (TS = 10%) and SS‐AD (TS = 20%), respectively. The kinetic analysis showed a higher specific methane production rate for LS‐AD than SS‐AD, while volumetric methane production rate presented a reverse trend. This study provides useful guidance for the sustainable utilization of VR while contributes to environmental protection and alleviates the dependence on fossil fuels.

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Effect of organic loading, feed-to-inoculum ratio, and pretreatment on the anaerobic digestion of tobacco stalks

Cited by 37 publications

References 40 publications

Effects of Adding Zero Valent Iron on the Anaerobic Digestion of Cow Manure and Lignocellulose

Effects of Adding Zero Valent Iron on the Anaerobic Digestion of Cow Manure and Lignocellulose

Enhancement of biogas production from organic fraction of municipal solid waste using acid pretreatment

Comparison of methane production performance of vinegar residue under liquid‐ and solid‐state conditions

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