Effect of deflocculation on the efficiency of low-energy microwave pretreatment and anaerobic biodegradation of waste activated sludge

Ebenezer, A. Vimala; Arulazhagan, P.; Kumar, S. Adish; Yeom, Ikjun; Banu, J. Rajesh

doi:10.1016/j.apenergy.2015.01.133

Cited by 74 publications

(15 citation statements)

References 25 publications

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“…The results show that MW irradiation combined with alkali pretreatment is effective in increasing mesophilic anaerobic biodegradability of sewage sludge. Ebenezer et al [58] reported an increased COD and biopolymers release of WAS treated with Sodium citrate, a cationic binding agent, followed by microwaves pretreatment. They also concluded that the above pretreatment made the biomass more amenable for batch AD and hence higher biogas production with a methane content of 60-70% of biogas volume.…”

Section: Physico Chemicalmentioning

confidence: 99%

“…Most studies reviewed assessed the impact of pretreatment processes on the biogas yield on a laboratory scale with a few determining the net energy gain/loss obtained after pretreatment [11,28,58]. Most studies in the literature are conducted as lab scale experiments and do not represent the same output that could be achieved through large scale biogas production facilities.…”

Section: Future Challenges and Conclusionmentioning

confidence: 99%

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Biomass Pretreatment for Enhancement of Biogas Production

Tamilarasan¹,

Azariah²

2019

Anaerobic Digestion

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Biomass is a renewable energy source developed from living or recently living plant and animal materials, which can be used as fuel. The main components present in biomass are polymers such as carbohydrate, protein, cellulose, lignin and fat. Biogas is produced when the biomass is anaerobically degraded by microorganisms. The process of anaerobic digestion (AD) takes place in four steps: hydrolysis, acidogenesis, acetogenesis, and methanogenesis. The hydrolysis step is rate limiting due to the presence of complex polymers in biomass. Pretreatment is a process in which the biomass is made ready for microbial attack. This pretreatment can be physical operations such as communition, irradiation etc.; chemical treatment with alkali, acids, wet oxidation etc.; biological pretreatment, by fungi or enzymes; or a combination of these processes. During the pretreatment process, the compact structure of biomass is disrupted and exposed which.

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Section: Physico Chemicalmentioning

confidence: 99%

Section: Future Challenges and Conclusionmentioning

confidence: 99%

Biomass Pretreatment for Enhancement of Biogas Production

Tamilarasan¹,

Azariah²

2019

Anaerobic Digestion

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“…Bacterial pre-treatment can be an alternative to these methods, as it consumes less energy (Kavitha et al, 2015a). It is reported in the literature that a minimum of 20% cell disintegration is essential for economical biogas production (Ebenezer et al, 2015;Banu et al, 2019b). The limitation of bacterial pre-treatment is that it fails to achieve this landmark 20% COD solubilization in WAS.…”

Section: Introductionmentioning

confidence: 99%

Effect of Dispersion Treatment on Dairy Waste Activated Sludge to Hasten the Production of Biogas

et al. 2019

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The solubilization potential of biological pre-treatment for waste activated sludge (WAS) is limited due to the floc structure of the WAS. Extra polymeric substances (EPS) are responsible for floc formation. In this investigation, an attempt has been made to disturb the floc structure of WAS by removing EPS with a disperser. In the first stage, the disperser treatment released 242 mg/L of soluble EPS when operated at 3,000 rpm for a duration of 50 s and caused deflocculation of WAS. In the second stage, deflocculated sludge was subjected to bacterial pre-treatment to assess the effect of floc disruption. During bacterial pre-treatment, it was found that deflocculated sludge produced higher organic solubilization of 23.9% and a reduction in suspended solids of 19.1% when compared to control (10.2 and 8.7%, respectively). Biogas yields were recorded of 220 mL/g COD in deflocculated sludge and 93 mL/g COD in flocculated sludge. From the above, it is evident that deflocculation effectively enhanced bacterial pre-treatment, leading to more solubilization and biogas production.

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“…Hydrolysis is known as the rate-limiting step. And only little of organic carbons can be biodegraded unless the particulate organic matter is significantly solubilized [8, 9]. Aiming at strengthening the performance of anaerobic digestion, some efforts have been developed, such as chemical, mechanical, biological, and thermal cofermentation treatments [10–14].…”

Section: Introductionmentioning

confidence: 99%

Volatile Fatty Acids Production from Codigestion of Food Waste and Sewage Sludge Based onβ-Cyclodextrins and Alkaline Treatments

Yang

Liu

Chen

et al. 2016

Archaea

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Volatile fatty acids (VFAs) are preferred valuable resources, which can be produced from anaerobic digestion process. This study presents a novel technology using β-cyclodextrins (β-CD) pretreatment integrated alkaline method to enhance VFAs production from codigestion of food waste and sewage sludge. Experiment results showed that optimized ratio of food waste to sewage sludge was 3 : 2 because it provided adequate organic substance and seed microorganisms. Based on this optimized ratio, the integrated treatment of alkaline pH 10 and β-CD addition (0.2 g/g TS) performed the best enhancement on VFAs production, and the maximum VFAs production was 8631.7 mg/L which was 6.13, 1.38, and 1.57 times higher than that of control, initial pH 10, and 0.2 g β-CD/g TS treatment, respectively. Furthermore, the hydrolysis rate of protein and polysaccharides was greatly improved in integration treatment, which was 1.18–3.45 times higher than that of other tests. Though the VFAs production and hydrolysis of polymeric organics were highly enhanced, the primary bacterial communities with different treatments did not show substantial differences.

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Effect of deflocculation on the efficiency of low-energy microwave pretreatment and anaerobic biodegradation of waste activated sludge

Cited by 74 publications

References 25 publications

Biomass Pretreatment for Enhancement of Biogas Production

Biomass Pretreatment for Enhancement of Biogas Production

Effect of Dispersion Treatment on Dairy Waste Activated Sludge to Hasten the Production of Biogas

Volatile Fatty Acids Production from Codigestion of Food Waste and Sewage Sludge Based onβ-Cyclodextrins and Alkaline Treatments

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