Pretreatment of lignocellulosic biomass from animal manure as a means of enhancing biogas production

Nasir, Ismail Muhammad; Ghazi, Tinia Idaty Mohd

doi:10.1002/elsc.201500019

Cited by 32 publications

(15 citation statements)

References 53 publications

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“…Previously, several studies have shown that NaOH pretreatment was effective and improved the methane yields of lignocellulosic biomass and livestock manures. For instance, NaOH pretreatment improved the methane yields of wheat straw from 39 to 112% 48 and by 46 and 26% for poultry and cattle manure, respectively 24 . Similarly, Liu et al 45 .…”

Section: Resultsmentioning

confidence: 90%

“…The improved methane yields after an alkaline pretreatment is due to the delignification of the lignocellulosic biomass and solubilization of organic matter. Previous studies have shown that during NaOH pretreatment the accessibility of holocellulose is increased and is closely related to delignification 24 . The removal of lignin will lead to considerable change in the microstructure of the cell wall and thereby increase the accessibility of cellulose and hemicelluloses to anaerobic microorganisms and so their biodegradability 23,49 …”

Section: Resultsmentioning

confidence: 99%

“…Despite promising results, thermo‐alkaline pretreatments are not currently implemented at full‐scale anaerobic digestion plants due to high operational costs, excessive salt discharge in the process water, and the generation of potential inhibitors such as polyphenols 23,24 . Indeed, recent studies have demonstrated that a polyphenol concentration of up to 1 g L −1 can inhibit methane production resulting in microbial community shift 25 .…”

Section: Introductionmentioning

confidence: 99%

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Reduction of the environmental footprint of thermo‐alkali pretreatment by reusing black liquor during anaerobic digestion of lignocellulosic biomasses

Peyrelasse

Kaparaju

Lallement³

et al. 2021

Biofuels Bioprod Bioref

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In this study, the effect of thermo‐alkaline pretreatment and recycling of the liquid fraction (black liquor) for successive pretreatment steps on chemical composition and methane yields from horse manure was investigated. At first, horse manure was subjected to alkaline pretreatment at 70 °C for 1 h (8.6 g NaOH/100 g total solids). Pretreated biomass was then separated into solid and liquid fractions (black liquor). In the subsequent stages, black liquor was mixed with 20% (v/v) of fresh NaOH and was reused to pretreat subsequent batches of horse manure (cycles 1–4). Chemical analyses showed that thermo‐alkaline pretreatment was effective in the delignification and solubilization of organic matter and thereby increased the holocellulose (cellulose and hemicelluloses) content in the solid fraction of horse manure. On comparison with untreated horse manure methane yields (225 ± 1 L CH4 kg−1 VSadded), thermo‐alkaline pretreatment improved the methane yields of horse manure by 39% (313 ± 16 L CH4 kg−1 VSadded). However, the effectiveness of black liquor recycling on methane production decreased (from 39 to 12%) with an increase in the number of recycling steps (from 1 to 4). Nevertheless, recycling of black liquor reduced the consumption of NaOH (40%) and water use (60%). Thus, thermo‐alkaline pretreatment with liquor recycling was found to be an effective pretreatment with an economic gain of 2.4 to 10.4 compared to pretreatment without recycling. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd

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Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reduction of the environmental footprint of thermo‐alkali pretreatment by reusing black liquor during anaerobic digestion of lignocellulosic biomasses

Peyrelasse

Kaparaju

Lallement³

et al. 2021

Biofuels Bioprod Bioref

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“…), and c surface area of each char. The yield and surface area are based on a single measurement, whereas the pH was obtained from triplicate measurements while manures consist of partially digested lignocellulose, nitrogen, phosphorus, and alkali metals (Muhammad Nasir and Mohd Ghazi 2015;Shen et al 2015). Thus, the chemical composition of the precursors is likely to contain a mixture of organic, inorganic, and lignocellulosic components.…”

Section: Characterization Of the Surface Functionalitiesmentioning

confidence: 99%

The impact of hydrothermal carbonization on the surface functionalities of wet waste materials for water treatment applications

Niinipuu

Latham

Boily

et al. 2020

Environ Sci Pollut Res

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Hydrothermal carbonization (HTC) is an energy-efficient thermochemical process for converting wet waste products into value added materials for water treatment. Understanding how HTC influences the physicochemical properties of the resultant materials is critical in optimizing the process for water treatment, where surface functionality and surface area play a major role. In this study, we have examined the HTC of four wet waste streams, sewage sludge, biosludge, fiber sludge, and horse manure at three different temperatures (180°C, 220°C, and 260°C). The physicochemical properties of these materials were examined via FTIR, SEM and BET with their adsorption capacity were assessed using methylene blue. The yield of solid material after hydrothermal carbonization (hydrochar) decreased with increasing temperature for all samples, with the largest impact on horse manure and fiber sludge. These materials also lost the highest degree of oxygen, while HTC had minimal impact on biosludge and sewage sludge. The differences here were due to the varying compositions of each waste material, FTIR identified resonances related to cellulose in horse manure and fiber sludge, which were not detected in biosludge and sewage sludge. Adsorption capacities varied between 9.0 and 68 mg g −1 with biosludge HTC at 220°C adsorbing the highest amount. Adsorption also dropped drastically at the highest temperature (260°C), indicating a correlation between adsorption capacity and HTC conditions. This was attributed to the loss of oxygen functional groups, which can contribute to adsorption. These results suggest that adsorption properties can be tailored both by selection of HTC temperature and feedstock.

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“…Typically, only 60% of the cellulose content of manure is converted to methane, while the rest leaves the digester because it is inaccessible to the microorganisms since it is protected by lignin. Therefore, the methane yield is also low compared to other feedstocks [19].…”

Section: Introductionmentioning

confidence: 98%

Chemical Methods for Hydrolyzing Dairy Manure Fiber: A Concise Review

2021

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This paper reviews the chemical hydrolysis processes of dairy manure fiber to make its sugar accessible to microorganisms during anaerobic digestion and identifies obstacles and opportunities. Researchers, so far, investigated acid, alkali, sulfite, and advanced oxidation processes (such as hydrogen peroxide assisted by microwave/ultrasound irradiation, conventional boiling, and wet oxidation), or their combinations. Generally, dilute acid (3–10%) is less effective than concentrated acid (12.5–75%), which decrystallizes the cellulose. Excessive alkaline may produce difficult-to-degrade oxycellulose. Therefore, multi-step acid hydrolysis (without alkaline) is preferred. Such processes yielded 84% and 80% manure-to-glucose and -xylose conversion, respectively. Acid pretreatment increases lignin concentration in the treated manure and hinders subsequent enzymatic processes but is compatible with fungal cellulolytic enzymes which favor low pH. Manure high alkalinity affects dilute acid pretreatment and lowers glucose yield. Accordingly, the ratio of manure to the chemical agent and its initial concentration, reaction temperature and duration, and manure fineness need optimization because they affect the hydrolysis rate. Optimizing these factors or combining processes should balance removing hemicellulose and/or lignin and increasing cellulose concentrations while not hindering any subsequent process. The reviewed methods are neither economical nor integratable with the on-farm anaerobic digestion. Economic analysis and energy balance should be monolithic components of the research. More research is required to assess the effects of nitrogen content on these processes, optimize it, and determine if another pretreatment is necessary.

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Pretreatment of lignocellulosic biomass from animal manure as a means of enhancing biogas production

Cited by 32 publications

References 53 publications

Reduction of the environmental footprint of thermo‐alkali pretreatment by reusing black liquor during anaerobic digestion of lignocellulosic biomasses

Reduction of the environmental footprint of thermo‐alkali pretreatment by reusing black liquor during anaerobic digestion of lignocellulosic biomasses

The impact of hydrothermal carbonization on the surface functionalities of wet waste materials for water treatment applications

Chemical Methods for Hydrolyzing Dairy Manure Fiber: A Concise Review

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