Biological treatment of PAH-contaminated sediments in a Sequencing Batch Reactor

Chiavola, Agostina; Baciocchi, Renato; Gavasci, Renato

doi:10.1016/j.jhazmat.2010.08.010

Cited by 26 publications

(12 citation statements)

References 20 publications

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“…In course of sediment treatment in a Sequencing Batch Reactor (SBR) at varied time-length of the cycle Chiavola et al (2010) obtained 60-80% removal efficiency for PAH. They reported the highest removal for 3-ring PAHs, particularly fluorene, while pyrene and crysene were only partly decom-posed.…”

Section: Resultsmentioning

confidence: 99%

“…This means that transformation and/or partial degradation of various harmful chemicals lead to releasing intermediate products and may be the cause of contaminating groundwater. Chiavola et al (2010) report that aerobic biodegradation of low molecular mass polycyclic aromatic hydrocarbons (PAHs) by bacteria and microorganisms has been documented by numerous authors. Higher molecular weight PAHs (5 or 6 aromatic rings) are more resistant to biological decomposition.…”

Section: Introductionmentioning

confidence: 99%

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Removal of Refractory Pollutants from Landfill Leachate Using Two‐Phase System

Koc-Jurczyk

2014

Water Environment Research

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The study focused on the problem of removing refractory substances from leachate treated by means of activated sludge method and advanced oxidation process. Biological treatment was conducted in sequencing batch biofilm reactor. Biologically treated leachate was subject to further chemical treatment with the use of Fenton reagent. The permanent dosage of H2O2 amounting to 2 mg x L(-1) was applied. Fe(II):H2O2 ratio was 1:10, 1:5 and 1:3. Biological treatment allowed for removing 97% of benzene and only 20% of ethylbenzene. There was a 25% decrease in the concentration of volatile organochlorine compounds. The concentration of benzene in chemically treated leachate increased in comparison with the value found in biologically treated leachate and the growth coincided with the decreasing Fe(II):H2O2 ratio. An analysis of polycyclic aromatic hydrocarbons showed that leachate subjected to advanced oxidation contained the sum of polycyclic aromatic hydrocarbons that was lower than in biologically treated leachate, irrespective of Fe(II):H2O2 ratio.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Removal of Refractory Pollutants from Landfill Leachate Using Two‐Phase System

Koc-Jurczyk

2014

Water Environment Research

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“…In this regard, SBs can involve the addition of nutrients, inoculum (in the case of using bioaugmentation), a variety of possible electron acceptors, or an increased pollutant availability by means of surfactants addition or biosurfactant production, thereby facilitating the degradation of recalcitrant contaminants or severely weathered mixtures [36,37]. Bioslurry treatments for PAHs at different scales have previously been described [38,39].…”

Section: Introductionmentioning

confidence: 99%

Bioaugmentation Treatment of a PAH-Polluted Soil in a Slurry Bioreactor

et al. 2020

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A bioslurry reactor was designed and used to treat loamy clay soil polluted with polycyclic aromatic hydrocarbons (PAHs). To this end, biostimulation alone, or combined with bioaugmentation with two bacterial strains (Rhodocccus erythropolis and Pseudomonas stuzeri) previously isolated from the polluted site, was applied. The PAH concentrations decreased notably after 15 days in all of the treatments. The concentrations of the two- and three-ring compounds fell by >80%, and, remarkably, the four- to six-ring PAHs also showed a marked decrease (>70%). These results thus indicate the capacity of bioslurry treatments to improve, notably, the degradation yields obtained in a previous real-scale remediation carried out using biopiles. In this sense, the remarkable results for recalcitrant PAHs can be attributed to the increase pollutants’ bioavailability achieves in the slurry bioreactors. Regarding bioaugmentation, although treatment with R. erythropolis led to a somewhat greater reduction of lighter PAHs at 15 days, the most time-effective treatment was achieved using P. stutzeri, which led to an 84% depletion of total PAHs in only three days. The effects of microbial degradation of other organic compounds were also monitored by means of combined qualitative and quantitative gas chromatography mass spectrometry (GC–MS) tools, as was the evolution of microbial populations, which was analyzed by culture and molecular fingerprinting experiments. On the basis of our findings, bioslurry technology emerges as a rapid and operative option for the remediation of polluted sites, especially for fine soil fractions with a high load of recalcitrant pollutants.

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“…For instance, if the value of the volumetric exchange ratio could be properly controlled, it would be possible to limit the pollutant load of the biomass in the SBR. So, it could be avoided the inhibition phenomena [33].…”

Section: Introductionmentioning

confidence: 99%

Comparison of different removal techniques for selected pharmaceuticals

Vona

Martino

García-Ivars

et al. 2015

Journal of Water Process Engineering

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a b s t r a c tRecently, there is an emergence of endocrine-disrupting compounds, pharmaceuticals, and personal care products (EDC/PPCPs) as important pollutants to remove from drinking water and reclaimed wastewater. In this work, the efficiency of removing pharmaceuticals (PCs) from model aqueous solutions and raw wastewater with ultrafiltration (UF), nanofiltration (NF), activated carbon adsorption (AC), biological methods (SBR) and oxidation with ClO 2 was investigated. Some treatments have also been used as combined processes: UF + NF, UF + AC, SBR + ClO 2 . Ibuprofen, Acetaminophen, Diclofenac, Sulfamethoxazole, Clonazepam, and Diazepam were selected as model compounds. In order to evaluate their removal, PC solutions were also considered at several operating conditions (pH, conductivity, concentration, and temperature), and optimal conditions were obtained. Experiments were performed at usual PC concentrations in wastewaters: 1000 ng/L for Ibuprofen and Acetaminophen, 300 ng/L for Diclofenac, Sulfamethoxazole, Clonazepam, and Diazepam. Separation was evaluated by liquid chromatography-mass spectroscopy. Results indicated that the removal efficiency depends on their Log K OW , which is intrinsically related to their hydrophobicity and then, to their adsorption onto the surface (UF, NF, and AC). Also, NF, AC, and combined processes (UF + NF, UF + AC) were the most suitable separation techniques to obtain high removal efficiencies for most of the PCs used, except for Acetaminophen (which showed great removal efficacy using SBR). UF presented low removal yields for all PCs tested. ClO 2 treatment was more effective at high concentration (50 mg ClO 2 /L). Furthermore, results also showed that there are significant differences on the performance of the processes applied and which treatment is the most effective for each PC analyzed.

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Biological treatment of PAH-contaminated sediments in a Sequencing Batch Reactor

Cited by 26 publications

References 20 publications

Removal of Refractory Pollutants from Landfill Leachate Using Two‐Phase System

Removal of Refractory Pollutants from Landfill Leachate Using Two‐Phase System

Bioaugmentation Treatment of a PAH-Polluted Soil in a Slurry Bioreactor

Comparison of different removal techniques for selected pharmaceuticals

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