Review on pretreatment techniques to improve anaerobic digestion of sewage sludge

Nguyễn, Văn Khánh; Chaudhary, Dhiraj Kumar; Dahal, Ram Hari; Trinh, Ngoc Hoang; Kim, Jaisoo; Chang, Soon Woong; Hong, Yongseok; La, Duong Duc; Nguyen, Xuan Cuong; Ngo, Huu Hao; Chung, Woo Jin; Nguyen, Dinh Duc

doi:10.1016/j.fuel.2020.119105

Cited by 265 publications

(105 citation statements)

References 174 publications

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“…As sludge treatment gains more attention, the increase of volatile solids loading rate inside anaerobic digesters in MWWTPs remains a critical issue. To this regard, besides pretreatment of mixed sludge to enhance biodegradability, dewaterability, and biogas production [11], a separate pretreatment of each sludge fraction has been proposed as a promising approach [12]. It is based on the direct feed of anaerobic digestor with primary sludge and the subsequent feed with secondary sludge after dynamic thickening that results in increased concentration of biomass and overall enhanced digester performance [12,13].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Mesophilic Anaerobic Digestion of Primary Sewage Sludge

Sakaveli

Petala

Tsiridis

et al. 2021

Water

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Processing of the produced primary and secondary sludge during sewage treatment is demanding and requires considerable resources. Most common practices suggest the cotreatment of primary and secondary sludge starting with thickening and anaerobic digestion. The aim of this study is to investigate the anaerobic digestion of the primary sludge only and estimate its impact on sludge treatment and energy recovery. Within this context, the performance of the anaerobic digestion of primary sludge is explored and focused on practices to further enhance the methane production by using additives, e.g., a cationic polyelectrolyte and attapulgite. The results showed that the overall yield in methane production during anaerobic digestion of primary sludge alone was higher than that obtained by the anaerobic digestion of mixed primary and secondary sludge (up to 40%), while the addition of both organic polyelectrolyte and attapulgite enhanced further the production of methane (up to 170%). Attapulgite increased the hydrolysis rate of biosolids and produced relatively stabilized digestate, though of lower dewaterability. Moreover, the results suggest that single digestion of primary sludge may accomplish higher methane production capacities at lower digestors’ volume increasing their overall efficiency and productivity, while the produced digestates are of adequate quality for further utilization mainly in agricultural or energy sectors.

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Section: Introductionmentioning

confidence: 99%

Enhanced Mesophilic Anaerobic Digestion of Primary Sewage Sludge

Sakaveli

Petala

Tsiridis

et al. 2021

Water

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“…Other commercially available pre-treatment techniques are ultrasonication (Hielscher Ultrasonics GmbH, Teltow, Germany) [160], electrokinetic disintegration (BioCrack from Vogelsang GmbH, Essen, Germany) [161], and high-pressure homogenization such as the Crown™ Disintegration System by Evoqua Water Technologies (Pittsburgh, PA, USA) [162]. There are several other chemical, mechanical, and biological processes subject to extensive research, which have been reviewed by Wang et al [163], Zhen et al [164], Wacławek et al [165], and Nguyen et al [166], showing successful results regarding improvement in biogas yields.…”

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confidence: 99%

Biogas Production from Organic Wastes: Integrating Concepts of Circular Economy

Ellacuriaga

García-Cascallana

Gómez

2021

Fuels

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Anaerobic digestion is traditionally used for treating organic materials. This allows the valorization of biogas and recycling of nutrients thanks to the land application of digestates. However, although this technology offers a multitude of advantages, it is still far from playing a relevant role in the energy market and from having significant participation in decarbonizing the economy. Biogas can be submitted to upgrading processes to reach methane content close to that of natural gas and therefore be compatible with many of its industrial applications. However, the high installation and operating costs of these treatment plants are the main constraints for the application of this technology in many countries. There is an urgent need of increasing reactor productivity, biogas yields, and operating at greater throughput without compromising digestion stability. Working at organic solid contents greater than 20% and enhancing hydrolysis and biogas yields to allow retention times to be around 15 days would lead to a significant decrease in reactor volume and therefore in initial capital investments. Anaerobic digestion should be considered as one of the key components in a new economy model characterized by an increase in the degree of circularity. The present manuscript reviews the digestion process analyzing the main parameters associated with digestion performance. The novelty of this manuscript is based on the link established between operating reactor conditions, optimizing treatment capacity, and reducing operating costs that would lead to unlocking the potential of biogas to promote bioenergy production, sustainable agronomic practices, and the integration of this technology into the energy grid.

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“…Aerobic treatments involve the treatment of sludge with air in the presence of aerobic or facultative anaerobic microbes before anaerobic digestion [9]. Oxygen is injected into the treatment system, which accelerates the hydrolysis rate of the organics by enhancing the activity of the micro-organisms [28]. Aerobic treatment prior to anaerobic digestion improves the hydrolysis stage, the sludge solubilization, accelerates hydrolytic activities, increases the methane yield by 20-50%, and decreases VS by 21-64% [28].…”

Section: Aerobic Treatmentmentioning

confidence: 99%

“…Oxygen is injected into the treatment system, which accelerates the hydrolysis rate of the organics by enhancing the activity of the micro-organisms [28]. Aerobic treatment prior to anaerobic digestion improves the hydrolysis stage, the sludge solubilization, accelerates hydrolytic activities, increases the methane yield by 20-50%, and decreases VS by 21-64% [28]. This suggests that aerobic pre-treatment does not decrease the methanogenic activity of methanogens within the anaerobic digester and can be a great addition to a multi-stage system [28].…”

Section: Aerobic Treatmentmentioning

confidence: 99%

“…Aerobic treatment prior to anaerobic digestion improves the hydrolysis stage, the sludge solubilization, accelerates hydrolytic activities, increases the methane yield by 20-50%, and decreases VS by 21-64% [28]. This suggests that aerobic pre-treatment does not decrease the methanogenic activity of methanogens within the anaerobic digester and can be a great addition to a multi-stage system [28]. Besides being used in the pre-treatment stages, aerobic processes can be employed after anaerobic digestion to enhance nutrient removal.…”

Section: Aerobic Treatmentmentioning

confidence: 99%

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Multi-Integrated Systems for Treatment of Abattoir Wastewater: A Review

Gutu

Basitere

Harding

et al. 2021

Water

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Biological wastewater treatment processes such as activated sludge and anaerobic digestion remain the most favorable when compared to processes such as chemical precipitation and ion exchange due to their cost-effectiveness, eco-friendliness, ease of operation, and low maintenance. Since Abattoir Wastewater (AWW) is characterized as having high organic content, anaerobic digestion is slow and inadequate for complete removal of all nutrients and organic matter when required to produce a high-quality effluent that satisfies discharge standards. Multi-integrated systems can be designed in which additional stages are added before the anaerobic digester (pre-treatment), as well as after the digester (post-treatment) for nutrient recovery and pathogen removal. This can aid the water treatment plant effluent to meet the discharge regulations imposed by the legislator and allow the possibility for reuse on-site. This review aims to provide information on the principles of anaerobic digestion, aeration pre-treatment technology using enzymes and a hybrid membrane bioreactor, describing their various roles in AWW treatment. Simultaneous nitrification and denitrification are essential to add after anaerobic digestion for nutrient recovery utilizing a single step process. Nutrient recovery has become more favorable than nutrient removal in wastewater treatment because it consumes less energy, making the process cost-effective. In addition, recovered nutrients can be used to make nutrient-based fertilizers, reducing the effects of eutrophication and land degradation. The downflow expanded granular bed reactor is also compared to other high-rate anaerobic reactors, such as the up-flow anaerobic sludge blanket (UASB) and the expanded granular sludge bed reactor (EGSB).

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Review on pretreatment techniques to improve anaerobic digestion of sewage sludge

Cited by 265 publications

References 174 publications

Enhanced Mesophilic Anaerobic Digestion of Primary Sewage Sludge

Enhanced Mesophilic Anaerobic Digestion of Primary Sewage Sludge

Biogas Production from Organic Wastes: Integrating Concepts of Circular Economy

Multi-Integrated Systems for Treatment of Abattoir Wastewater: A Review

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