The Effects of the Most Important Phenolic Constituents of Olive Mill Wastewater on Batch Anaerobic Methanogenesis

Borja, R.; Banks, C.J.; Maestro-Durán, R.; Alba, J.

doi:10.1080/09593331708616373

Cited by 61 publications

(39 citation statements)

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“…Therefore, we recommend that current methods should consider, for a proper acclimation, a range of concentrations and longer retention times when testing the anaerobic degradation of compounds, including those previously thought to be recalcitrant. It is probable that the lack of implementation of our recommendation would lead to caffeic acid being considered as not capable of being converted into methane by Borja et al (1996). Our evaluation agrees with Moreno and Buitron (2004), who found that the use of different acclimation strategies and inocula affected the anaerobic digestion of 4-chlorophenol.…”

Section: Lag Phase and Recalcitrancesupporting

confidence: 81%

“…This was thought to be due to its lack of conversion into methane when it was used as the only carbon source with anaerobic digesting sludge (Borja et al, 1996). However, this claim was probably a result of deploying an assay of short duration preventing the acclimation of microbes to caffeic acid which is a less biodegradable substrate.…”

Section: Resultsmentioning

confidence: 97%

“…Previous experiments with caffeic acid and digesting sludge were unsuccessful (Borja et al, 1996). With pure cultures, however, the conversion of caffeic acid to methane is likely to occur, as revealed by studies on the methanogenesis of caffeic acid by ferulic acid-degrading anaerobic bacteria (Evans and Fuchs, 1988).…”

Section: Introductionmentioning

confidence: 99%

“…The experiments by Borja et al (1996) led to the assumption that caffeic acid could not be converted to methane when it was used as the only carbon source. In the study, caffeic acid inhibited 65% of the methane production associated with controls (without caffeic acid).…”

Section: Caffeic Acid Methanation and Mineralizationmentioning

confidence: 99%

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Toxicity and biodegradability of caffeic acid in anaerobic digesting sludge

Hernández

Edyvean

2018

WSA

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Caffeic acid in waste comes from a variety of industries, and its disposal is likely to increase due to emerging processes such as graphene production and use in healthcare products. The current sustainable option to treat waste caffeic acid and prevent its natural transformation in soil to greenhouse gases, is anaerobic digestion. However, little is known about the toxic and inhibitory effects of caffeic acid on biogas production as well as its ultimate anaerobic biodegradability; or about the reactiveadsorptive processes taking place with caffeic acid in sludge, metabolic intermediates, thermodynamic limitations and the effects on extracellular polymeric substances (EPS). Standard methods revealed that 80% of biogas production (EC 80 ) from a readily digestible biomass was inhibited at 389 mg caffeic acid·g -1 VSS. Up to 52% of caffeic acid was biodegraded. β-oxidation and reductive dehydroxylation were the initial activation reactions transforming caffeic acid into typical polyphenol structural units (protocatechuic acid and 4HBA). Adsorption of caffeic acid (53.3% and 28.6%) to the sludge occurred even at inhibitory concentrations. The EPS structure remained unchanged regardless of the increase in concentration of caffeic acid. Reasonable concentrations of caffeic acid could be co-digested with a similar readily digestible biomass with an expected reduction in biogas production. It is feasible to treat waste caffeic acid by anaerobic digestion and adsorption of its derivates, in order to reduce the contribution to global warming and to protect the environment.

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Section: Lag Phase and Recalcitrancesupporting

confidence: 81%

Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Caffeic Acid Methanation and Mineralizationmentioning

confidence: 99%

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Toxicity and biodegradability of caffeic acid in anaerobic digesting sludge

Hernández

Edyvean

2018

WSA

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“…The large amount of lignin derivatives of these effluents is responsible of their dark-brown colour (Calvo et al, Coulibaly et al 621 1995). The phenolic compounds of such wastewaters exert some bactericidal effects on wastewater treatment plant (WWTP) microorganisms (Borja et al, 1996;Fang and Chan, 1997;Vassilev et al, 1997;Sayadi et al, 2000). Fungal pretreatment (Table 2) of these effluents under aerobic conditions makes it possible to obtain phenol reduction (51-100%), good decolourisation (31-100%), biochemical oxygen demand (BOD) reduction up to 85.4%, and enzyme production (protease, Lacc (EC 1.10.3.2); LiP (EC 1.11.1.14), MnP (EC 1.11.1.13), amylase, etc.)…”

Section: Agroindustrial Effluentsmentioning

confidence: 99%

Utilization of fungi for biotreatment of raw wastewaters

Coulibaly¹,

Gourène²,

Agathos³

2003

Afr. J. Biotechnol.

121

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Fungal biomasses are capable of treating metal-contaminated effluents with efficiencies several orders of magnitude superior to activated carbon (F-400) or the industrial resin Dowex-50. Additionally, fungal biomasses are susceptible to engineering improvements and regeneration of their capabilities. With regard to organic pollutants, excessive nutrients and dyes, fungi can remove them from wastewaters, leading to a decrease in their toxicities. However, the detoxification rates seem to be dependent on media and culture conditions. The postreatement by anaerobic bioprocesses of effluents that have been pretreated with fungi can lead to higher biogas than the original effluents. In addition to the degradation of organic pollutants, fungi produce added-value products such as enzymes (LiP, MnP, Lacc, amylase, etc.) and single-cell protein (SCP). Most research on fungal capacities to purify polluted effluents has been performed on a laboratory scale, hence there is a need to extend such research to pilot scale and to apply it to industrial processes.

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