Current advances and future outlook on pretreatment techniques to enhance biosolids disintegration and anaerobic digestion: A critical review

Uthirakrishnan, Ushani; Sharmila, V. Godvin; Merrylin, J.; Kumar, S. Adish; Dharmadhas, Jeba Sweetly; Varjani, Sunita; Banu, J. Rajesh

doi:10.1016/j.chemosphere.2021.132553

Cited by 46 publications

(9 citation statements)

References 156 publications

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“…The energy expended cost is one of the factors which is necessary to determine the beneficialness of the pretreatment process, and it almost accounts for about 62% of the capital cost (Sharmila et al, 2020a). In the wastewater treatment plant, biosolids management accounts for 50% of the operating cost, and the economic feasibility of the pretreatment method is marginally associated with bioenergy generation and solids reduction (Uthirakrishnan et al, 2022). The addition of the pretreatment process to the traditional anaerobic digester adds on operational expenditures, whereas in microalgal biomass, the effective bioenergy generation hinges on the cost incurred for cultivation, harvesting, conversion to energy operation of the digester and product purification, product price, and overhead charges.…”

Section: Cost Analysismentioning

confidence: 99%

Indexing energy and cost of the pretreatment for economically efficient bioenergy generation

Preethi

Gunasekaran

2023

Front. Energy Res.

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The growing necessity for energy worldwide has led to the hunt for an interminable solution in the form of sustainable energy generation. To accomplish sustainability, these problems can be resolved using renewable waste biomass, which is readily accessible and low priced. Moreover, the ecological issue due to the disposal of this waste biomass into the environment is also counteracted by the use of this biomass for energy generation along with the substantial solid reduction for disposal. The presence of complex biopolymers in biomass, which hasten the hydrolysis step during energy generation, was enhanced by the application of a pretreatment method. The efficiency of the pretreatment methods was enhanced by maintaining the cost and energy usage since the commercialization of this method is largely limited. The major economic drivers are based on solid concentration and, thus, lead to higher capital costs. This study reveals the wide assortment of current progression in pretreatment techniques for treating waste biomass with special focus on combined and phase-separated pretreatment. Additionally, it converses the advantages and limitations of pretreatment methods. This pivotal investigation brings about the cost- and energy-effective conversion solution that paves the way for a sustainable energy system.

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Section: Cost Analysismentioning

confidence: 99%

Indexing energy and cost of the pretreatment for economically efficient bioenergy generation

Preethi

Gunasekaran

2023

Front. Energy Res.

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“…However, recent trends have shown that rather than discarding the biosolids, the waste hierarchy is needed. According to Uthirakrishnan et al [ 9 ], the three R’s of waste consist of Reduce, Reuse, and Recycle which is a useful approach to make biosolids disposal safer by the anaerobic digestion process. Based on the procedures—reduction of biosolid volume, development of reusable byproducts—biogas (a renewable energy source), electricity, and reuse of leftover compost (used as fertilizer)—according to our opinion, the three R’s approach is suitable to apply to improving waste biomass disposal through biological developments that focus on the transformation of waste resources into value-added products.…”

Section: Recent Trendsmentioning

confidence: 99%

Enzymatic Treatments for Biosolids: An Outlook and Recent Trends

Quintero-García

Pérez-Soler

Amezcua‐Allieri

2023

IJERPH

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Wastewaters are nutrient-rich organic materials containing significant concentrations of different nutrients, dissolved and particulate matter, microorganisms, solids, heavy metals, and organic pollutants, including aromatic xenobiotics. This variety makes wastewater treatment a technological challenge. As a result of wastewater treatment, biosolids are generated. Biosolids, commonly called sewage sludge, result from treating and processing wastewater residuals. Increased biosolids, or activated sludge, from wastewater treatment is a major environmental and social problem. Therefore, sustainable and energy-efficient wastewater treatment systems must address the water crisis and environmental deterioration. Although research on wastewater has received increasing attention worldwide, the significance of biosolids treatments and valorization is still poorly understood in terms of obtaining value-added products. Hence, in this review, we established some leading technologies (physical, chemical, and biological) for biosolids pretreatment. Later, the research focuses on natural treatment by fungal enzymes to end with lignocellulosic materials and xenobiotic compounds (polyaromatic hydrocarbons) as a carbon source to obtain biobased chemicals. Finally, this review discussed some recent trends and promising renewable resources within the biorefinery approach for bio-waste conversion to value-added by-products.

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“…[ [100][101][102][103][104]72] Bio-polymers can be also applied for soli to promote its water retention properties, particular in semi-arid environments.…”

Section: Excess Granular Sludge and Circular Economymentioning

confidence: 99%

“…In addition to the granules' characteristics, the applied shear force is also a critical factor that should be considered when designing the dewatering stage of AGS. Uthirakrishnan et al [72] highlighted that conventional dewatering centrifugation might negatively impact the dewaterability of AGS. Zhang et al [70] found that the AGS exhibited a low dewaterability as a result of granules disintegration when a high shear force has been applied.…”

Section: Dewaterability Of Excess Granular Sludgementioning

confidence: 99%

Aerobic Granular Sludge: Perspectives for Excess Sludge Management and Resource Recovery

Dababat,

Enaime,

Wichern

et al. 2023

Chemie Ingenieur Technik

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Aerobic granular sludge (AGS) technology is gaining increasing interest globally. However, several aspects are still challenging its installation, as the integration into existing municipal wastewater treatment plants. The operation of AGS units in continuous flow mode could facilitate that integration; yet has only been experienced at lab and pilot scales. Further, handling of excess granular sludge constitutes a prominent challenge. Even that, adopting effective strategies for its management holds promising contributions to the circular economy by fostering the reuse and recovery of valuable resources. The recovery of phosphorus and alginate‐like polymers holds significant commercial potential worldwide, with broad applications in agriculture, food, pharmaceuticals, and biotechnology.

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Current advances and future outlook on pretreatment techniques to enhance biosolids disintegration and anaerobic digestion: A critical review

Cited by 46 publications

References 156 publications

Indexing energy and cost of the pretreatment for economically efficient bioenergy generation

Indexing energy and cost of the pretreatment for economically efficient bioenergy generation

Enzymatic Treatments for Biosolids: An Outlook and Recent Trends

Aerobic Granular Sludge: Perspectives for Excess Sludge Management and Resource Recovery

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