Bioethanol production from mixed food waste by an effective enzymatic pretreatment

Kıran, Esra Uçkun; Liu, Yu

doi:10.1016/j.fuel.2015.06.101

Cited by 119 publications

(22 citation statements)

References 34 publications

(26 reference statements)

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“…FW is a suitable organic waste for recycling into renewable energy by bioengineering [4]. However, improper disposal practices of FW can result in a various environmental problems, such as toxicity to aquatic life, polluting surface and ground waters, and changes in soil quality [5,6]. Anaerobic digestion (AD) has been proposed as a relatively cost-effective technology for FW treatment and renewable energy generation [7].…”

Section: Introductionmentioning

confidence: 99%

Chemically Enhanced Primary Sludge as an Anaerobic Co-Digestion Additive for Biogas Production from Food Waste

Kang¹,

Liu²

2019

Processes

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In order to overcome process instability and buffer deficiency in the anaerobic digestion of mono food waste (FW), chemically enhanced primary sludge (CEPS) was selected as a co-substrate for FW treatment. In this study, batch tests were conducted to study the effects of CEPS/FW ratios on anaerobic co-digestion (coAD) performances. Both soluble chemical oxygen demand (SCOD) and protease activity were decreased, with the CEPS/FW mass ratio increasing from 0:5 to 5:0. However, it was also found that the accumulation of volatile fatty acids (VFAs) was eliminated by increasing the CEPS/FW ratio, and that corresponding VFAs concentrations decreased from 13,872.97 to 1789.98 mg chemical oxygen demand per L (mg COD/L). In addition, the maximum value of cumulative biogas yield (446.39 mL per g volatile solids removal (mL/g VSs removal )) was observed at a CEPS/FW ratio of 4:1, and that the tendency of coenzyme F420 activity was similar to biogas production. The mechanism analysis indicated that Fe-based CEPS relived the VFAs accumulation caused by FW, and Fe(III) induced by Fe-based CEPS enhanced the activity of F420. Therefore, the addition of Fe-based CEPS provided an alternative method for FW treatment.Chemically enhanced primary sedimentation (CEPS) is produced during the chemically enhanced primary treatment process of wastewater treatment plants (WWTPs) using an Fe/Al-based coagulant addition that contains a large amount of polymeric sludge rich in Fe/Al. As described by Lin [14], ferric chloride (FeCl 3 ) (10-12 mg Fe/L of dosage) was used to enhance the primary wastewater treatment of the Stonecutters Island Sewage Treatment Works in Hong Kong, and a large number of Fe-based CEPS sludge was produced. Fe is an essential trace metal for anaerobic microorganisms that participates in the synthesis of some important metalloenzymes in methanogenesis [15]. It has been demonstrated that addition of ferric chloride could disinhibit excessive volatile fatty acids [16] and enhance biogas production by enriching Coprothermobacter for protein fermentation and Methanosarcina for methanogenesis from the perspective of microorganisms [17]. It has been proposed that the introduction of FeCl 3 might contribute to a reduction of VFAs content and protect methanogenesis from the accumulation of volatile acids. Thus, the effects of Fe-based CEPS on VFAs reduction and methanogenesis during the coAD of FW need to be studied deeply.This study intends to explore coAD performance of FW and Fe-based CEPS from the perspective of organic matter degradation, while simultaneously investigating the relationship between biogas production and Fe-based CEPS content under mesophilic digestion. Different mixing ratios of the CEPS and FW were conducted to study the typical substances involved in the coAD process, including organic substrate solubilization, VFAs variation, and biogas production. Meanwhile, representative enzyme activities associated with AD were monitored to analyze process stability of biogas production. Materials and Methods Substrat...

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Section: Introductionmentioning

confidence: 99%

Chemically Enhanced Primary Sludge as an Anaerobic Co-Digestion Additive for Biogas Production from Food Waste

Kang¹,

Liu²

2019

Processes

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“…Nowadays, most of the FW is disposed in landfills or incinerated, practices associated with different issues, such as rising costs of waste disposal, lack of space, leaching, public environmental concern and emission of toxic and greenhouse effect gases (Curry and Pillay, 2012; Uçkun Kiran and Liu, 2015). Therefore, it is necessary to develop and optimize technologies that allow a proper treatment of this biowaste.…”

Section: Introductionmentioning

confidence: 99%

Dry anaerobic digestion of food waste and cardboard at different substrate loads, solid contents and co-digestion proportions

Capson-Tojo

Trably

Rouez

et al. 2017

Bioresource Technology

104

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The increasing food waste production calls for developing efficient technologies for its treatment. Anaerobic processes provide an effective waste valorization. The influence of the initial substrate load on the performance of batch dry anaerobic co-digestion reactors treating food waste and cardboard was investigated. The load was varied by modifying the substrate to inoculum ratio (S/X), the total solids content and the co-digestion proportions. The results showed that the S/X was a crucial parameter. Within the tested values (0.25, 1 and 4gVS·gVS), only the reactors working at 0.25 produced methane. Methanosarcina was the main archaea, indicating its importance for efficient methanogenesis. Acidogenic fermentation was predominant at higher S/X, producing hydrogen and other metabolites. Higher substrate conversions (≤48%) and hydrogen yields (≤62mL·gVS) were achieved at low loads. This study suggests that different value-added compounds can be produced in dry conditions, with the initial substrate load as easy-to-control operational parameter.

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“…Saccharomyces cerevisiae yeast has been extensively reported as a responsible organism for the bioconversion of solid wastes (apple pomace, grape pomace, sugar beet pomace, potato peel, sweet sorghum stalks, sugarcane bagasse, food waste, etc.) into bioethanol production under SSF [54,[179][180][181][182][183]. Du et al [181] confirmed the feasibility of scaling up the bioconversion of sweet sorghum stalks by S. cerevisiae from 500 mL to a 127 m 3 rotary drum fermenter and subsequently in a 550 m 3 rotary drum fermenter with 88% of relative theoretical ethanol yield in less than 20 h. Anjani et al [180] presented an interesting integrated bioconversion of potato peel by SSF for the production of bioethanol and manure by employing yeast and fungi (Aspergillus niger, A. variabilis and S. cerevisiae) in an effort to achieve zero waste generation.…”

Section: Bioethanol Productionmentioning

confidence: 99%

Solid-State Fermentation as a Novel Paradigm for Organic Waste Valorization: A Review

et al. 2017

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Abstract:The abundance of organic solid waste throughout the world has become a common issue that needs complete management at every level. Also, the scarcity of fuel and the competition between food and substance as an alternative to a petroleum-based product has become a major problem that needs to be properly handled. An urge to find renewable substances for sustainable development results in a strategy to valorize organic solid waste using solid state fermentation (SSF) and to manage the issue of solid wastes in a green approach. This paper reviews management of solid wastes using SSF, with regard to its current application, advantages and challenges, downstream processing in SSF, economic viewpoint, and future perspectives.

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Bioethanol production from mixed food waste by an effective enzymatic pretreatment

Cited by 119 publications

References 34 publications

Chemically Enhanced Primary Sludge as an Anaerobic Co-Digestion Additive for Biogas Production from Food Waste

Chemically Enhanced Primary Sludge as an Anaerobic Co-Digestion Additive for Biogas Production from Food Waste

Dry anaerobic digestion of food waste and cardboard at different substrate loads, solid contents and co-digestion proportions

Solid-State Fermentation as a Novel Paradigm for Organic Waste Valorization: A Review

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