Pretreatment Methods of Organic Wastes for Biogas Production

Salihu, Aliyu; Alam, Md. Zahangir

doi:10.3923/jas.2016.124.137

Cited by 51 publications

(20 citation statements)

References 94 publications

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“…In relation to the fermentation of untreated sludge, no significant increase in methane content in biogas generated from sludge modified with ultrasonic field was noted. This theory was confirmed by research carried out by other scientists [30,31]. Total biogas production amounted to 30.14 L, and biogas yield 0.645 L g VSS −1 .…”

Section: Methane Fermentation Of Excess Sludge Disintegrated By An Ulsupporting

confidence: 70%

Biogas Generation from Sonicated Excess Sludge

Zawieja

Włodarczyk

Kowalczyk

2019

Water

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The article presents an analysis of the possibilities of biogas production in the process of methane fermentation of sonicated excess sludge. The greater the percentage of methane in biogas, the higher its calorific value. In order to increase the intensity of biogas production containing approximately 70% of methane, sewage sludge is disintegrated. In particular, excess sludge formed as a result of advanced wastewater treatment by the activated sludge method shows low biodegradability. The study aim was to examine the effect of the ultrasonic field disintegration of excess sludge on biogas production. As a result of subjecting the sludge to disintegration by ultrasonic field, there was an increase in the digestion degree of sewage sludge. In the methane fermentation process of modified sludge, an increase of the biogas yield was noted, which confirmed the supportive action of ultrasonic field on the excess sludge biodegradation. In the case of disintegration of excess sludge by ultrasonic field, for the ultrasonic field intensity value of 4.3 W cm−2 and a sonication time equal to 300 s, the highest values of soluble chemical oxygen demand (SCOD), total organic carbon (TOC), and volatile fatty acids (VFAs) concentrations were obtained. In the process of conventional methane fermentation, biogas yield value was 0.303 L g VSS−1, while in the process of methane fermentation of sonicated excess sludge, the value 0.645 L g VSS−1.

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Section: Methane Fermentation Of Excess Sludge Disintegrated By An Ulsupporting

confidence: 70%

Biogas Generation from Sonicated Excess Sludge

Zawieja

Włodarczyk

Kowalczyk

2019

Water

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“…This method depends mainly on breakdown or destruction of organic compounds using acids, alkalis, and oxidants, and its efficiency is highly affected by the substrate characteristics [61]. Importantly, this type of pretreatment is less recommended for easily biodegradable substrates, as it can be associated with accumulation of VFAs, which ultimately leads to inhibition of the methanogenesis step [57].…”

Section: Chemical Pretreatmentmentioning

confidence: 99%

“…During acid pretreatment, hemicellulose is hydrolyzed into monosaccharides, while the lignin condensates and precipitates [55,61,62]. The process is effective for substrates with high lignocellulosic content as it breaks down the lignin, and also because the hydrolytic microbes are capable of acclimating to acidic conditions [61]. Strong acidic pretreatment may result in the production of inhibitory by-products, such as furfural and hydroxymethylfurfural (HMF) [62][63][64].…”

Section: Chemical Pretreatmentmentioning

confidence: 99%

A Review on Anaerobic Digestion of Lignocellulosic Wastes: Pretreatments and Operational Conditions

Sayara

Sánchez

2019

Applied Sciences

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Anaerobic digestion (AD) has become extremely popular in the last years to treat and valorize organic wastes both at laboratory and industrial scales, for a wide range of highly produced organic wastes: municipal wastes, wastewater sludge, manure, agrowastes, food industry residuals, etc. Although the principles of AD are well known, it is very important to highlight that knowing the biochemical composition of waste is crucial in order to know its anaerobic biodegradability, which makes an AD process economically feasible. In this paper, we review the main principles of AD, moving to the specific features of lignocellulosic wastes, especially regarding the pretreatments that can enhance the biogas production of such wastes. The main point to consider is that lignocellulosic wastes are present in any organic wastes, and sometimes are the major fraction. Therefore, improving their AD could cause a boost in the development in this technology. The conclusions are that there is no unique strategy to improve the anaerobic biodegradability of lignocellulosic wastes, but pretreatments and codigestion both have an important role on this issue.

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“…Tian et al [26] reported that using an individual ultrasonic pretreatment method resulted in an increase of 20.7% biodegradability in sewage sludge. Salihu and Alam [27] illustrated the optimal doses of ozone as 0.05 to 0.5 g O 3 /g TS for sludge (organic wastes) solubilization. Ozone doses from 0.06 to 0.16 g O 3 /g TS were examined by Chu et al [23], applying a microbubble ozonation process that improved sludge solubilization efficiency by 15-30%.…”

Section: Cod and Biopolymers Solubilisationmentioning

confidence: 99%

“…Moreover, complete mineralization occurred when the ozone doses applied were too high [28], resulting in loss of methane production. Thus, this study used the ozone dose based on the concentration range of Salihu and Alam [27].…”

Section: Cod and Biopolymers Solubilisationmentioning

confidence: 99%

Effect of Assisted Ultrasonication and Ozone Pretreatments on Sludge Characteristics and Yield of Biogas Production

Anh

et al. 2019

Processes

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The effects of ultrasonic and ozonation pretreatments on organic solubilization, anaerobic biodegradability, and biogas production were elucidated in this study. Two pretreatment methods for batch anaerobic digestion for biogas recovery with the same material and experimental conditions were the focus for comparison. Anaerobic digestion experiments were conducted at ambient temperature with the solid retention time set to 25 days. The obtained results indicated that the soluble chemical oxygen demand increased from 0.344 without pretreatment to 1.023 and 1.228 g/L with ultrasound and ozone pretreatments, respectively, whereas the yields of biogas production in the 25 days increased by 32.3 and 52.9% via ultrasonic irradiation and ozonation relative to the control case, respectively. The biodegradability of the organic compounds of the samples for the cases of ultrasound, ozone pretreatments, and control achieved 55.9, 64.31, and 39.18%, respectively, in terms of chemical oxygen demand (COD) removal efficiencies. The physicochemical characteristics of sludge flocs were investigated via scanning with particle sizes, which were obviously affected by pretreatments of sonication and ozonation, resulting in finer particles than in the control case.

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Pretreatment Methods of Organic Wastes for Biogas Production

Cited by 51 publications

References 94 publications

Biogas Generation from Sonicated Excess Sludge

Biogas Generation from Sonicated Excess Sludge

A Review on Anaerobic Digestion of Lignocellulosic Wastes: Pretreatments and Operational Conditions

Effect of Assisted Ultrasonication and Ozone Pretreatments on Sludge Characteristics and Yield of Biogas Production

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