The enhancement of anaerobic biodegradability of waste activated sludge by surfactant mediated biological pretreatment

Kavitha, S.; Jayashree, C.; Kumar, S. Adish; Yeom, Ikjun; Banu, J. Rajesh

doi:10.1016/j.biortech.2014.01.118

Cited by 181 publications

(69 citation statements)

References 24 publications

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“…Following the thermal and alkaline-thermal pretreatments, the soluble protein concentration increased from days 0 to 3 of anaerobic digestion, did not show any obvious variation between days 3 to 6, and then quickly decreased at later anaerobic digestion stages. A similar pattern was observed in a previous study (Kavitha et al 2014). The soluble protein concentration in the alkaline-thermal pretreatment was highest (969.62 mg·kg -1 ) on day 6 of anaerobic digestion.…”

Section: Changes In Soluble Proteins and Carbohydrates During Anaerobsupporting

confidence: 89%

Influence of Alkaline-Thermal Pretreatment on High-Solids Anaerobic Digestion of Dewatered Activated Sludge

Guo¹,

Du²,

Ji³

et al. 2016

BioResources

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The influence of alkaline (23.77 mg NaOH/g total solid), thermal (134.95 °C), and combined alkaline-thermal pretreatment on parameters of dewatered activated sludge (DAS) during high-solids anaerobic digestion was investigated. Soluble chemical oxygen demand (SCOD), soluble proteins, and VFAs (volatile fatty acids) concentrations were significantly higher (by two-fold) in pretreated DAS samples than in the control. During subsequent anaerobic digestion, the concentrations first increased and then decreased. Total chemical oxygen demand (TCOD) decreased by 28.40% to 40.92%, and ammonia nitrogen accumulated during anaerobic digestion. For the alkaline, thermal, and alkalinethermal pretreatments, daily methane yield significantly increased in midanaerobic digestion and cumulative methane yield (CMY) increased by 9.92, 35.25, and 52.95%, respectively, relative to the control. There were clear synergistic effects of alkaline-thermal pretreatment, resulting in a 17.20% increase in CMY compared with the sum of the separate alkaline and thermal pretreatments. Therefore, alkaline-thermal pretreatment was helpful for high-solids anaerobic digestion of DAS and was an effective pretreatment method. Gompertz model fitting to the CMY curve produced determination coefficients (R 2 ) greater than 0.9931 for all pretreatments, which was better than for a first-order kinetic model fitting curve.

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Section: Changes In Soluble Proteins and Carbohydrates During Anaerobsupporting

confidence: 89%

Influence of Alkaline-Thermal Pretreatment on High-Solids Anaerobic Digestion of Dewatered Activated Sludge

Guo¹,

Du²,

Ji³

et al. 2016

BioResources

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“…A bacterial pretreatment by two inoculated strains results in better SS reduction and COD solubilization. Further scrutinizing the BMP assay for the evaluation of pretreatment, the biogas production potential was found to be 0.467 L/ (g VS) by using modified Gompertz equation (Kavitha et al 2014b). …”

Section: Reaction Mechanism Of Biological Treatmentmentioning

confidence: 99%

Various Sludge Pretreatments: Their Impact on Biogas Generation

Banu

Kavitha

2017

Waste Biomass Management – A Holistic Approach

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Biogas produced through anaerobic degradation of waste activated sludge (WAS) in wastewater treatment plants has gained much more attention as it is a renewable energy resource. An apparent advantage of anaerobic digestion is the generation of biogas that presents a renewable substitute for utilization of fossil fuels. It was observed that pretreatment has to be done prior to anaerobic degradation (AD) to enhance the biogas generation. This review deals with various pretreatments-chemical, physical, mechanical, combinative, phase-separated pretreatment, their mode of action, advantages and their impact on biogas generation. An extensive review of these pretreatment techniques could plausibly aid in increasing the biogas production and thus rises the sustainable energy generation.

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“…The efficiency of the hydrolysis step of WAS AD is strongly influenced by the presence of EPS and in order to overcome this rate restricting step (that is enforced by EPS complexes), pre-treatment techniques are applied to enhance its digesting capability [146] and make the substrate more amenable for AD. In theory, the application of pre-treatment disrupts the sludge flocs, disintegrates the bacterial cell walls and transfers the EPS, intracellular organic matter and divalent cations into the liquid phase of the WAS; thus enhancing sludge biodegradability [147] and ultimately reduces hydraulic retention time (the amount of time the feedstock spends inside the digester) [148]. Microwave heating has been successfully applied to pre-treat biomass or sludge for subsequent AD.…”

Section: Mw Pre-treatment For Biogas Production Via Anaerobic Digestionmentioning

confidence: 99%

The application of microwave heating in bioenergy: A review on the microwave pre-treatment and upgrading technologies for biomass

Kostas

Beneroso

Robinson

2017

Renewable and Sustainable Energy Reviews

242

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Bioenergy, derived from biomass and/or biological (or biomass-derived) waste residues, has been acknowledged as a sustainable and clean burning source of renewable energy with the potential to reduce our reliance on fossil fuels (such as oil and natural gas). However, many bioenergy processes require some form of pre-treatment and/or upgrading procedure for biomass to generate a modified residue with more suitable properties and render it more compatible with the specific energy conversion route chosen. Many of these pre-treatments (or upgrading procedures) involve some form of substantive heating of the biomass to achieve this modification. Microwave (MW) heating has attracted much attention in recent years due to the advantages associated with dielectric heating effects. These advantages include rapid and efficient heating in a controlled environment, increasing processing rates and substantially shortening reaction times by up to 80%. However, despite this interest, the growth of industrial MW heating applications for bioenergy production has been hindered by a lack of understanding of the fundamentals of the MW heating mechanism when applied to biomass and waste residues. This article presents a review of the current scientific literature associated with the application of microwave heating for both the pre-treatment and upgrading of various biomass feedstocks across different bioenergy conversion pathways including thermal and biochemical processes. The fundamentals behind microwave heating will be explained, as well as discussion of the imperative areas which require further research and development to bridge the gap between fundamental science in the laboratory and the successful application of this technology at a commercial scale.

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The enhancement of anaerobic biodegradability of waste activated sludge by surfactant mediated biological pretreatment

Cited by 181 publications

References 24 publications

Influence of Alkaline-Thermal Pretreatment on High-Solids Anaerobic Digestion of Dewatered Activated Sludge

Influence of Alkaline-Thermal Pretreatment on High-Solids Anaerobic Digestion of Dewatered Activated Sludge

Various Sludge Pretreatments: Their Impact on Biogas Generation

The application of microwave heating in bioenergy: A review on the microwave pre-treatment and upgrading technologies for biomass

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