Anaerobic treatability of high oil and grease rendering wastewater

Nakhla, George; Al-Sabawi, Mustafa; Bassi, A.; Liu, Victor

doi:10.1016/s0304-3894(03)00210-3

Cited by 40 publications

(27 citation statements)

References 14 publications

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“…Regarding the tested level of significance, averages of 2, 4 and 5 treatments do not differ, as well as averages from 2 and 6 treatments. Nakhla et al (2003) studied the effect of biosurfactant addition from cactus for anaerobic wastewater treatment with a high content of oils and greases (OG = 38, ) from an animal diet industry. The authors concluded that after 16 days of anaerobic digestion, the addition of biosurfactant in raw effluent removed SCOD from 11,200 to 7,050 mg L -1 .…”

Section: Anaerobic Biodegradation Of a Pretreated Effluentmentioning

confidence: 99%

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Use of biosurfactant surfactin produced from cassava wastewater for anaerobic treatment of effluent from a poultry slaughterhouse

Cosmann¹,

Gomes²,

Gomes³

et al. 2017

Afr. J. Biotechnol.

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The use of a biosurfactant surfactin produced by Bacillus subtilis LB5a in cassava growth medium (cassava wastewater) was evaluated to treat anaerobically, the effluent from a poultry slaughterhouse. During the effluent pretreatment, effects of surfactin concentration factors were evaluated, considering the ones which were superior and below its critical micelle concentration (CMC = 28 mg L -1 ): 6, 13, 27, 31, 48, 73 and 56 mg L -1 and temperature (25, 30, 42.5, 55 and 60°C) up to 6 h, using the rotational central composite design. During anaerobic treatment, flasks were filled with anaerobic sludge as inoculum and a pretreated effluent for 4.5 h in its different concentrations of surfactin. Reactors were connected to eudiometers under static system at 34°C. During the pretreatment phase, there was a direct ratio between temperature and surfactin concentrations according to the increase of organic matter solubilization, measured by soluble chemical oxygen demand (SCOD). These results have shown surfactin applicability produced by B. subtilis LB5a during the anaerobic treatment of effluent from a poultry slaughterhouse; as for all treatments, there was no inhibition of microbial consortium of the anaerobic sludge. SCOD removal was above 80%, while oil and greases removal was above 70%, plus a propitious specific methane yield.

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Section: Anaerobic Biodegradation Of a Pretreated Effluentmentioning

confidence: 99%

“…The use of surfactants produced by microorganisms is also evaluated by environmental sanitation area as well as for the treatment of contaminated soil and water by fats, oils and derivatives (Nitschke and Pastore, 2002;Nakhla et al, 2003;Kumar et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Use of biosurfactant surfactin produced from cassava wastewater for anaerobic treatment of effluent from a poultry slaughterhouse

Cosmann¹,

Gomes²,

Gomes³

et al. 2017

Afr. J. Biotechnol.

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“…Saharan et al [8] identified a number of potential bio-surfactants derived from microbiological and plant sources, although few have been investigated for application in anaerobic digestion. Some successful applications of bio-surfactants include use of 'BOD-balance' by Nakhla et al [11], which is a combination of bio-surfactant and enzyme used by Damasceno et al [12].…”

Section: Background and Introductionmentioning

confidence: 99%

“…Investigation of BOD-balance by Nakhla et al [11] as a pre-treatment to aid in the digestion of wastewater high in FOG yielded promising results. With a dose of 500 mg BOD-balance/L, the researchers measured no change in chemical oxygen demand (COD) solubilisation following pre-treatment, but did record a significant improvement in particulate COD (PCOD) soluble COD (SCOD) degradation.…”

Section: Background and Introductionmentioning

confidence: 99%

“…Bio-surfactant addition increased PCOD removal by 96%, and SCOD by 100%, while also increasing COD biodegradation rate coefficient of 164-238%. The authors note that the increase in PCOD removal is due to a reduction in surface tension induced by the bio-surfactant, which helps solubilize hydrophobic organics, including FOG and colloidals [11]. Unfortunately, there was little focus on methane production during the investigation by Nakhla et al [11].…”

Section: Background and Introductionmentioning

confidence: 99%

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Bovine bile as a bio-surfactant pre-treatment option for anaerobic digestion of high-fat cattle slaughterhouse waste

Harris

Schmidt

McCabe

2018

Journal of Environmental Chemical Engineering

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A B S T R A C TBovine bile was assessed as a novel bio-surfactant pre-treatment to enhance anaerobic digestion of lipid-rich dissolved air flotation (DAF) sludge using biochemical methane potential (BMP) tests. Bile was dosed at arbitrary concentrations from 0.2-6 g/L. At 0.6 g bile/L, methane yield increased by 7.08%. Doses above 2 g bile/L produced negative impacts on SMP, kinetics and digestion profile. At 6 g/L bile produced a 6% decrease in specific methane production and up to 79% additional inhibitory duration, delayed time of peak methane production by up to 74%, and slowed total digestion time by up to 65%. Reaction kinetics declined linearly with respect to bile addition, reaching half the control value at 6 g/L bile concentration. Subsequent anaerobic toxicity assays between 1 and 6 g bile/L revealed that bile has an inhibitory effect under BMP testing at these higher doses. The economic viability of using bile as a bio-surfactant was assessed. In comparison to the current use of bile as a sale product to pharmaceutical companies, the addition of 0.2 g bile/L to existing slaughterhouse waste streams could increase the value of bile to 220% of its current sale value. The promising results of bile dosed at 0.6 g/L under BMP testing warrant further investigation into long-term impact of bile pre-treatments of high-fat slaughterhouse wastewater in semi-continuous digestion experiments.

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Impacts of cell surface characteristics on population dynamics in a sequencing batch yeast reactor treating vegetable oil-containing wastewater

Hesham

Liu

et al. 2011

Appl Microbiol Biotechnol

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Ten yeast strains acquired from different sources and capable of utilizing vegetable oil or related compounds (fatty acid or oleic acid) as sole carbon sources were inoculated into a sequencing batch reactor (SBR) for the treatment of high-strength vegetable oil-containing wastewater. The SBR system stably removed >89% of chemical oxygen demand (COD) and >99% of oil when fed with wastewater containing 15 g/L COD and 10 g/L oil in average. Denaturing gradient gel electrophoresis of polymerase chain reaction-amplified 26S rRNA genes showed that among the ten yeast strains, only Candida lipolytica, Candida tropicalis, and Candida halophila were dominant in the system. To elucidate the major factors affecting the selection of yeast strains in the SBR system, the three dominant strains were compared with two non-dominant strains in terms of COD removal performance, biomass yield, cell settleability, cell flocculation ability, cell emulsification ability, and surface hydrophobicity. Results showed that hydrophobicity and emulsification ability of yeast cells were the two most important factors determining the selection of yeast strains in the treatment of high-strength oil-containing wastewater.

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Anaerobic treatability of high oil and grease rendering wastewater

Cited by 40 publications

References 14 publications

Use of biosurfactant surfactin produced from cassava wastewater for anaerobic treatment of effluent from a poultry slaughterhouse

Use of biosurfactant surfactin produced from cassava wastewater for anaerobic treatment of effluent from a poultry slaughterhouse

Bovine bile as a bio-surfactant pre-treatment option for anaerobic digestion of high-fat cattle slaughterhouse waste

Impacts of cell surface characteristics on population dynamics in a sequencing batch yeast reactor treating vegetable oil-containing wastewater

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