Biodiesel Production from Waste Cooking Oil

Guerrero, Ana Helena Puerto; Guerrero-Romero, Andrés; Sierra, Fabio E.

doi:10.5772/25313

Cited by 26 publications

(20 citation statements)

References 5 publications

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“…The final disposal of WCO is a heavy burden due its high volume, and the incorrect discharge into sewers or drains cause blockages and odor or vermin problems. WCO have compounds that linger in the environment for many years, increase the organic load on water sources and form a thin layer over water surface that reduces the dissolved oxygen concentration required for subaquatic species, changing the ecosystem (Guerrero, Guerrero-Romero, & Sierra, 2011). These lipids-rich wastes can hamper the wastewater treatment due to the adsorption of long chain fatty acids (LCFA) onto the biomass (which causes sludge flotation and mass transfer problems), foam formation (resulting from the accumulation of nondegraded LCFA), and inhibition of anaerobic microbial communities (as a result of an increase of LCFA) (Alves et al, 2009;Appels et al, 2011).…”

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confidence: 99%

Microbial valorization of waste cooking oils for valuable compounds production – a review

Lopes

Miranda

Belo

2019

Critical Reviews in Environmental Science and Technology

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Waste cooking oils (WCO) are vegetable oils discarded after food frying and great amounts are produced worldwide. Its management is a challenge, due to the environmental risk of illegally disposal into rivers and landfills. The main approaches for WCO valorization included their incorporation as component of animal feed and biodiesel manufacturing. Yet, the development of new feasible approaches is attractive from an economic and ecological standpoint. Due to their composition in triglycerides, untreated WCO can be used as feedstock for microbial growth (several species are able to use them as carbon source) and production of added-value compounds. In this way, microbial valorization of WCO is a sustainable biotechnological approach to upgrade a waste into a renewable feedstock for bio-based industry, favoring the circular economy concept. The objective of this review is to highlight the potential use of WCO in bioprocesses as an alternative to other physicochemical treatments. Firstly, an introduction to WCO problematic is presented, describing most common applications used currently. Then, an extensive review on the use of WCO by microorganisms is shown, focusing on bacterial and fungi species and its exploitation for bioprocesses development to produce metabolites of industrial interest, such as biopolymers, biosurfactants, lipases and microbial lipids. KEYWORDS Added-value compounds; microbial conversion; waste cooking oils 1. Waste cooking oils: General overview Waste cooking oils (WCO) are generated from vegetable oils (coconut, sunflower, soybean, palm tree, cottonseed, rapeseed, olive, etc.) employed to fry foods in household and HORECA (Hotels, Restaurants and Catering) segments and are no longer suitable for human consumption. Specifically, in HORECA sector, fast food restaurants (particularly those of chicken and

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confidence: 99%

Microbial valorization of waste cooking oils for valuable compounds production – a review

Lopes

Miranda

Belo

2019

Critical Reviews in Environmental Science and Technology

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“…The effect starts when the WCO solidifies and accumulates inside the drainage system to deny the sewage from flowing freely to the wastewater treatment plant or sewage chamber. Once sewage is blocked, it causes sewer backups and overflows into surrounding environment, which could result in potential environmental health hazards and an extra costs being required for clean-up efforts [5,12,13].…”

Section: Introductionmentioning

confidence: 99%

Households’ Awareness, Attitudes and Practices Regarding Waste Cooking Oil Recycling in Petaling, Malaysia

Kabir¹,

Yacob²,

Radam³

2014

IOSRJESTFT

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“…When wastes are not correctly disposed, it can have serious environmental consequences. The disposal of a liter of AVU through the domestic or industrial sewerage can contaminate a volume higher than 50,000 liters of water (Guerrero et al, 2011), also producing energy losses and low yields in wastewater treatment plants. This makes it necessary to implement policies for AVU collection, which can be treated or used as raw material in the production of alternative energies, such as biodiesel.…”

Section: Arenas Et Almentioning

confidence: 99%

Production of biodiesel by esterification and transesterification from waste cooking oils

et al. 2020

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Large quantities of used vegetable oils (AVUs) are generated annually, as a result of food preparation, which can cause contamination of waters and soils, if they are not disposed of properly, but in turn have great potential in the production of biodiesel. In this work, the AVU collected from fast food establishments were subjected to an esterification pretreatment, varying the reaction conditions, molar ratio, catalyst concentration and time, to decrease the content of free fatty acids generated in the frying processes; after an alkaline transesterification. The initial acidity of the AVUs (10,08 ± 0,22 %) was found to drop below 1 % during esterification at 60 °C and 100 rpm, with RMAVU:MeOH of 1: 7 and HCl concentration of 0.3 % v/v, with a conversion of free fatty acids (FFA) to methyl esters of 94.48 and 98.61 % for reaction times of 4 and 6 hours, respectively. The previously esterified AVUs were subjected to a transesterification process with KOH as a catalyst in the presence of methanol, at 60 °C and 100 rpm, finding that the biodiesel produced was a mixture composed of the methyl esters of linoleic acids (57 %), palmitic (14 %), oleic (22 %), stearic (4 %) and elaidic (3 %). The highest concentration of methyl esters (93,797 ± 0.685 g.L-1) was obtained when using the esterified AVU during 6 hours of reaction. FTIR spectra confirmed the conversion of fatty acids to methyl esters, so this product could be used as a biofuel.

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Biodiesel Production from Waste Cooking Oil

Cited by 26 publications

References 5 publications

Microbial valorization of waste cooking oils for valuable compounds production – a review

Microbial valorization of waste cooking oils for valuable compounds production – a review

Households’ Awareness, Attitudes and Practices Regarding Waste Cooking Oil Recycling in Petaling, Malaysia

Production of biodiesel by esterification and transesterification from waste cooking oils

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