Biosorption with autochthonous and allochthonous fungal biomasses for bioremediation and detoxification of landfill leachate

Tigini, Valeria; Varese, Giovanna Cristina

doi:10.1007/s12665-018-7519-y

Cited by 4 publications

(2 citation statements)

References 28 publications

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“…The results demonstrated that leachate addition caused a significant decrease in biological activity of the allochthonous biomass, probably due to a partial inhibition of some bacterial strains. They confirmed SOUR max SOUR Inhibition rate that the autochthonous biomass was characterized by a higher biological activity in the presence of leachate because it did not suffer inhibitory effects of toxic compounds [26]. In contrast, the significant decrease of the respiration rate of the allochthonous biomass in presence of leachate, accounted for the lower amount of active fraction observed in R2.…”

Section: Metabolic Activity Of the Autochthonous And Allochthonous Bisupporting

confidence: 62%

Assessment of landfill leachate biodegradability and treatability by means of allochthonous and autochthonous biomasses

et al. 2020

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The biodegradability and treatability of a young (3 years old) municipal landfill leachate was evaluated by means of chemical oxygen demand (COD) fractionation tests, based on respirometric techniques. The tests were performed using two different biomasses: one cultivated from the raw leachate (autochthonous biomass) and the other collected from a conventional municipal wastewater treatment plant after its acclimation to leachate (allochthonous biomass). The long term performances of the two biomasses were also studied. The results demonstrated that the amount of biodegradable COD in the leachate was strictly dependent on the biomass that was used to perform the fractionation tests. Using the autochthonous biomass, the amount of biodegradable organic substrate resulted in approximately 75% of the total COD, whereas it was close to 40% in the case of the allochthonous biomass, indicating the capacity of the autochthonous biomass to degrade a higher amount of organic compounds present in the leachate. The autochthonous biomass was characterized by higher biological activity and heterotrophic active fraction (14% vs 7%), whereas the activity of the allochthonous biomass was significantly affected by inhibitory compounds in the leachate, resulting in a lower respiration rate (SOUR = 13 mg O2 gVSS-1 h-1 vs 37 mg O2 gVSS-1 h-1). The long-term performance of the autochthonous and allochthonous biomasses indicated that the former was more suitable for the treatment of raw landfill leachate, ensuring higher removal performance towards the organic pollutants.

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Section: Metabolic Activity Of the Autochthonous And Allochthonous Bisupporting

confidence: 62%

Assessment of landfill leachate biodegradability and treatability by means of allochthonous and autochthonous biomasses

et al. 2020

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“…In particular, it can be dealt with by two strategies. First, the biodegradation capability of autochthonous fungal strains could be explored, since they are already adapted to this toxic environment and to competition with autochthonous bacteria [ 3 , 14 , 19 ]. Otherwise, allochthonous fungal strains coming from well-characterized collections of microorganisms could be used.…”

Section: Introductionmentioning

confidence: 99%

Bioremediation of Landfill Leachate with Fungi: Autochthonous vs. Allochthonous Strains

Spina

Tigini

Romagnolo

et al. 2018

Life

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Autochthonous fungi from contaminated wastewater are potential successful agents bioremediation thanks to their adaptation to pollutant toxicity and to competition with other microorganisms present in wastewater treatment plant. Biological treatment by means of selected fungal strains could be a potential tool to integrate the leachate depuration process, thanks to their fungal extracellular enzymes with non-selective catalytical activity. In the present work, the treatability of two real samples (a crude landfill leachate and the effluent coming from a traditional wastewater treatment plant) was investigated in decolorization experiments with fungal biomasses. Five autochthonous fungi, Penicillium brevicompactum MUT 793, Pseudallescheria boydii MUT 721, P. boydii MUT 1269, Phanerochaete sanguinea MUT 1284, and Flammulina velutipes MUT 1275, were selected in a previous miniaturized decolorization screening. Their effectiveness in terms of decolorization, enzymatic activity (laccases and peroxidases), biomass growth and ecotoxicity removal was compared with that of five allochthonous fungal strains, Pleurotus ostreatus MUT 2976, Porostereum spadiceum MUT 1585, Trametes pubescens MUT 2400, Bjerkandera adusta MUT 3060 and B. adusta MUT 2295, selected for their well known capability to degrade recalcitrant pollutants. Moreover, the effect of biomass immobilization on polyurethane foam (PUF) cube was assessed. The best decolorization (60%) was achieved by P. spadiceum MUT 1585, P. boydii MUT 721 and MUT 1269. In the first case, the DP was achieved gradually, suggesting a biodegradation process with the involvement of peroxidases. On the contrary, the two autochthonous fungi seem to bioremediate the effluent mainly by biosorption, with the abatement of the toxicity (up to 100%). The biomass immobilization enhanced enzymatic activity, but not the DP. Moreover, it limited the biomass growth for the fast growing fungi, MUT 721 and MUT 1269. In conclusion, robust and versatile strains coming from well-characterized collections of microorganisms can obtain excellent results comparing and even exceeding the bioremediation yields of strains already adapted to pollutants.

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Biotransformation of industrial tannins by filamentous fungi

Prigione

Spina

Tigini

et al. 2018

Appl Microbiol Biotechnol

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Tannins are secondary metabolites widely distributed in the plant kingdom. They act as growth inhibitors towards many microorganisms: upon microbial attack, they are released helping to fight the infection of plant tissues. Extraction of tannins from plants is an active industrial sector with several applications from the beginning of the industrial era. Actually, tannins have many industrial applications in oenology, animal feeding, mining and chemical industry and, in particular, in the tanning industry. But tannins are also considered very recalcitrant pollutants in wastewaters of different origins. The ability to grow on plant substrates rich in tannins and on industrial tannin preparations is traditionally considered peculiar of some species of fungi that have developed mechanisms to tolerate the toxicity of tannins producing a complex enzymatic pattern active in the transformation of these substrates, mainly by hydrolysis and oxidation. Filamentous fungi capable of degrading tannins could have a strong environmental impact as bioremediation agents mostly in the treatment of tanning wastewaters.

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Biosorption with autochthonous and allochthonous fungal biomasses for bioremediation and detoxification of landfill leachate

Cited by 4 publications

References 28 publications

Assessment of landfill leachate biodegradability and treatability by means of allochthonous and autochthonous biomasses

Assessment of landfill leachate biodegradability and treatability by means of allochthonous and autochthonous biomasses

Bioremediation of Landfill Leachate with Fungi: Autochthonous vs. Allochthonous Strains

Biotransformation of industrial tannins by filamentous fungi

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