Developments in pre-treatment methods to improve anaerobic digestion of sewage sludge

Neumann, Patricio; Pesante, S.; Venegas, M.; Vidal, Gladys

doi:10.1007/s11157-016-9396-8

Cited by 224 publications

(94 citation statements)

References 176 publications

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“…Chen et al [175] suggested combining dilute acid treatment of lignocellulose with dilute alkali to eliminates the need for acid/ base neutralization of lignocellulose biomass, which could also reduce the inhibitory effect of degradation products. The most common pretreatment combinations are physicochemical and thermochemical [176]. Sharma et al [177] compared dilute acid and alkaline pretreatment, both at temperature of 150 • C and reported the maximum yield of 38 g/L of reducing sugars at 0.8 M sodium hydroxide after 30 min of incubation time, compared to 31 g/L of reducing sugars using dilute acid.…”

Section: Combined Pretreatmentsmentioning

confidence: 99%

Insight into Pretreatment Methods of Lignocellulosic Biomass to Increase Biogas Yield: Current State, Challenges, and Opportunities

et al. 2019

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Lignocellulosic biomass is recalcitrant due to its heterogeneous structure, which is one of the major limitations for its use as a feedstock for methane production. Although different pretreatment methods are being used, intermediaries formed are known to show adverse effect on microorganisms involved in methane formation. This review, apart from highlighting the efficiency and limitations of the different pretreatment methods from engineering, chemical, and biochemical point of views, will discuss the strategies to increase the carbon recovery in the form of methane by way of amending pretreatments to lower inhibitory effects on microbial groups and by optimizing process conditions.

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Section: Combined Pretreatmentsmentioning

confidence: 99%

Insight into Pretreatment Methods of Lignocellulosic Biomass to Increase Biogas Yield: Current State, Challenges, and Opportunities

et al. 2019

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“…CST values of the reactors with the sludge samples subjected to three pre‐treatment applications decreased similar to the control reactor following anaerobic stabilization. Neumann et al also found similar results and they reported that the large amount of unsettleable micro‐particles produced after the disintegration process may adversely affect dewaterability. In their study digested pre‐treated sludge has indicated better dewaterability compared to untreated digested sludge.…”

Section: Resultsmentioning

confidence: 62%

“…Although COD solubilization as a result of ultrasound pre-treatment was observed in this study, low effect on sludge digestibility can be observed as previously reported. [43] Hence, it could be concluded that a high COD solubilization from a pre-treatment does not necessarily lead to an increase in methane yield.…”

Section: Anaerobic Digestion Studiesmentioning

confidence: 99%

Comparative Assessment of Sludge Pre‐Treatment Techniques to Enhance Sludge Dewaterability and Biogas Production

Taş

Yangin‐Gomec

Ölmez-Hancı

et al. 2017

CLEAN Soil Air Water

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Effectiveness of ultrasonication, microwave technologies, and enzyme addition prior to anaerobic digestion is investigated using sludge samples taken from the secondary settling tank of a domestic wastewater treatment plant to improve methane production, enhance dewaterability characteristics of the sludge, and to reduce excess sludge. Microwave pre‐treatment (1500 W, 10 min at 175 °C) results in better extra digester performance (compared to the control reactor) in terms of methane production (25 m3 ton−1 suspended solids (SS)) than ultrasound (no improvement) and enzyme pre‐treatment (11 m3 ton−1 SS). While methane production is not improved as a result of ultrasonication pre‐treatment (15 000 kJ kg−1 SS), a noticeable increase (19%) is observed in the case of microwave pre‐treatment. Higher compactibility values are obtained after ultrasonication and microwave application compared to the control (i.e., from 7.1 to 8.7 and 9.2%, respectively) before anaerobic digestion. Although ultrasonication and microwave application decrease the dewaterability of the raw sludge (capillary suction time (CST) from 827 to 1364 and 2290 s, respectively), similar dewaterability results are obtained at the end of the anaerobic digestion process for all pre‐treated sludge samples. An economic assessment of this study shows that pre‐treatment with microwave results in more than 10‐fold less net cost compared to the enzyme application.

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“…Biogas which is one of the renewable energy carriers can be used as a substitute for fossil fuels in electricity production or as a fuel for combustion vehicles [2]. Rising fossil fuel prices and the growing interest in renewable energy sources, justifies the attempts of intensifying biogas production from sewage sludge [3,4]. Disadvantages of anaerobic digestion of sewage sludge such as long retention time of sludge in the digester or a low degree of volatile solids (VS) removal are an additional reason for the seeking of new solutions for enhancing the efficiency of this process [3,5].…”

Section: Introductionmentioning

confidence: 99%

“…fatty wastes) and pretreatment of the feedstock prior to its introduction to the digester, methods combining both of the mentioned should also be taken into consideration [6,7]. Benefits as well as drawbacks of the techniques mentioned above are well documented in literature [3,4,6,8,9]. However, the overwhelming part of these publications relates to sewage sludge.…”

Section: Introductionmentioning

confidence: 99%

Pretreatment methods as a means of boosting methane production from sewage sludge and its mixtures with grease trap sludge

Grosser

Neczaj

2017

E3S Web Conf.

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Abstract.The main objective of this study was to determine the applicability of the selected pretreatment methods as a means of intensification of methane production from sewage sludge as well as its mixtures with grease trap sludge. The addition of the fat rich material to the digester treating sewage sludge resulted in an increased methane yield as well as volatile solids (VS) removal of up to 36% (from 134.75 mL/g VS to 182.84 mL/g VS). Furthermore, thermochemical pretreatment of the co-digestion mixture resulted in an approximately 76% higher methane yield as compared to the untreated sewage sludge. The energy balance showed that, for both materials ultrasonic pretreatment and thermochemical pretreatment has an energy self-sufficiency. All of the tested models fit the experimental data with coefficients of determination higher than 0.96.

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Developments in pre-treatment methods to improve anaerobic digestion of sewage sludge

Cited by 224 publications

References 176 publications

Insight into Pretreatment Methods of Lignocellulosic Biomass to Increase Biogas Yield: Current State, Challenges, and Opportunities

Insight into Pretreatment Methods of Lignocellulosic Biomass to Increase Biogas Yield: Current State, Challenges, and Opportunities

Comparative Assessment of Sludge Pre‐Treatment Techniques to Enhance Sludge Dewaterability and Biogas Production

Pretreatment methods as a means of boosting methane production from sewage sludge and its mixtures with grease trap sludge

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