Anaerobic digestion of lipid-rich swine slaughterhouse waste: Methane production performance, long-chain fatty acids profile and predominant microorganisms

Zhang, Ning; Zhang, Han; Li, Wanwu; Zhang, Ruihong; Liu, Guangqing; Chen, Chang

doi:10.1016/j.biortech.2018.08.001

Cited by 73 publications

(26 citation statements)

References 41 publications

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“…The predominant microorganisms found to degrade long-chain fatty acids in rich swine slaughterhouse waste were Clostridium, Syntrophomonas and Methanospirillum. The reported long-chain fatty acids in this animal origin waste were similar to the ones contained in oils used in our study [43]. The literature mentioned Clostridium bryantii as bacteria capable of degrading the fatty acids with eleven carbon atoms and less.…”

Section: Soap Degradation Processessupporting

confidence: 81%

Physicochemical Characterization of Home-Made Soap from Waste-Used Frying Oils

et al. 2020

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The study aimed to describe the utilization of waste frying oils, originated mainly from households, in home-made soap production and to emphasize the advantages of soap biodegradation in comparison to biological treatment of oils. The physicochemical analyses of soaps were used to check the differences between the samples made of fresh and fried oils. Significant (p < 0.05) difference between the soaps made of fresh/fried olive oil pair was obtained, while the rapeseed sample pair did not differ significantly (p < 0.05). Malondialdehyde (MDA) exhibited notable differences with an increase from 1.94 μg/g to 2.33 μg/g for olive oil fresh/fried pair and from 3.43 μg/g to 4.10 μg/g for rapeseed–palm oil fresh/fried pair. The studies addressing the soap biodegradation process revealed that soaps are degrading up to four times faster than oils in waste processing plants. Literature data showed the syntrophic ways of soap degradation and degradation solely done by sulfate-reducing bacteria. Obtained results, same as literature data, indicated that soaps produced from fried plant oils represent acceptable products from the economic and environmental point of view. Soap production can be considered one of the possible ways toward reduction of waste oil disposal.

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Section: Soap Degradation Processessupporting

confidence: 81%

Physicochemical Characterization of Home-Made Soap from Waste-Used Frying Oils

et al. 2020

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“…The proteins in the fermentation liquid samples were conducted using the Lowry method [23]. Lipids were measured in the form of fatty acid methyl esters using a gas chromatograph (Agilent 6890 N, Palo Alto, CA, USA), as described in the literature [24].…”

Section: Methodsmentioning

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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“…UASB reactors are considered a low-cost and efficient high-rate anaerobic treatment system, which is due to the retention of high concentrations of biomass, the upward flow of the wastewater (no agitation needed), the ability to resist to low concentrations of oxygen without compromise the microbial metabolic activities, and the possibility of producing biogas (CHIPASA;MĘDRZYCKA, 2006;LETTINGA, 1995;STRONACH;RUDD;LESTER, 1986). Although UASB reactors have shown great performances in the treatment of high organic load wastewaters, some problems were reported when treating lipid-rich wastewater, such as flotation of the biomass granules due to fat, oil and/or grease adsorption (CHIPASA;MĘDRZYCKA, 2006;RINZEMA;ALPHENAAR;LETTINGA, 2007) and inhibitory effects of the long-chain fatty acids on the anaerobic microorganisms (KOSTER;CRAMER, 1987;LALMAN;BAGLEY, 2001;NING et al, 2018). These problems can be solved by applying a pre-treatment of the wastewater to remove free and suspended lipids and by using lipid-tolerant microorganisms (DAMASCENO et al, 2018;DEL NERY et al, 2007).…”

Section: Conventional Treatments Of Oily Food Wastementioning

confidence: 99%

Valorization and Treatment of Oily Wastewaters From Agro-Industries Using Lipases: An Overview

Mulinari¹,

Júnior²,

Oliveira³

et al. 2020

Ciência, Tecnologia E Inovação: Do Campo À Mesa

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Oily wastewater from agro-industries can cause severe environmental and public health damages if unproperly treated. The conventional methods have several limitations for the treatment of oily wastewaters since the oil fraction can cause pipe clogging and biomass washout during the biological step. Based on this, the use of lipases can increase the oil removal efficiency of the treatments, minimizing operational problems, and improving the performance of the biological process. Lipases can also be used for the valorization of the oily wastewaters, transforming these waste streams into valuable compounds, such as biodiesel, lubricants, antioxidant agents, etc. The use of wastes for the production of value-added compounds follows the circular economy approach, minimizing the generation of residues and potential environmental liabilities. Thus, this study aims to give a general overview of the main topics related to the treatment and valorization of oily wastewaters using lipases. The main characteristics of oily wastewaters from agro-industries are addressed, as well as the most used conventional techniques for their treatment. Some relevant information about the enzyme lipase is also discussed to give the reader a background about how these enzymes can be applied for the treatment and transformation of oily wastes.

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Anaerobic digestion of lipid-rich swine slaughterhouse waste: Methane production performance, long-chain fatty acids profile and predominant microorganisms

Cited by 73 publications

References 41 publications

Physicochemical Characterization of Home-Made Soap from Waste-Used Frying Oils

Physicochemical Characterization of Home-Made Soap from Waste-Used Frying Oils

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

Valorization and Treatment of Oily Wastewaters From Agro-Industries Using Lipases: An Overview

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