| Title | Comparison of different types of landfill leachate treatments by employment of nontarget screening to identify residual refractory organics and principal component analysis |
| Abstract | Three different chemical oxidation processes were investigated in terms of their capability to degrade organic chemical components of real mature landfill-leachate in combination with biological treatment run in a Sequencing Batch Biofilter Granular Reactor (SBBGR). H2O2, H2O2 + UV and O3 were integrated with SBBGR and respective effluents were analyzed and compared with the effluent obtained from biological SBBGR treatment alone. In agreement with their respective oxidative power, conventional bulk parameters (residual COD, TOC, Ntot, TSS) determined from the resulting effluents evidenced the following efficacy ranking for degradation: SBBGR/O3 > SBBGR/UV + H2O2 > SBBGR/H2O2 > SBBGR. A more detailed characterization of the organic compounds was subsequently carried out for the four treated streams. For this, effluents were first subjected to a sample preparation step, allowing for a classification in terms of acidic, basic, strongly acidic and strongly basic compounds, and finally to analysis by liquid chromatography/high resolution mass spectrometry (LC/HR-MS). This classification, combined with further data post-processing (non-target screening, Venn Diagram, tri-dimensional plot and Principal Component Analysis), evidenced that the SBBGR/H2O2 process is comparable to the pure biological oxidation. In contrast, SBBGR/O3 and SBBGR/UV + H2O2 not only resulted in a very different residual composition as compared to SBBGR and SBBGR/H2O2, but also differ significantly from each other. In fact, and despite of the SBBGR/O3 being the most efficient process, this treatment remained chemically more similar to SBBGR/H2O2 than to SBBGR/UV + H2O2. This finding may be attributable to different mechanism of degradation involved with the use of UV radiation. Apart from these treatment differences, a series of recalcitrant compounds was determined in all of the four treatments and partly identified as hetero-poly-aromatic species (humic acids-like species). ? 2018 Elsevier B.V. |
| Source | Science of the total environment 635, pp. 984–994 |
| Keywords | Landfill leachateOxidation treatment; PCA; Recalcitrant |
| Journal | Science of the total environment |
| Editor | Elsevier, Lausanne ;, Paesi Bassi |
| Year | 2018 |
| Type | Articolo in rivista |
| DOI | 10.1016/j.scitotenv.2018.04.135 |
| Authors | Pastore, C. and Barca, E. and Del Moro, G. and Di Iaconi, C. and Loos, M. and Singer, H.P. and Mascolo, G. |
| Text | 397362 2018 10.1016/j.scitotenv.2018.04.135 Scopus 2 s2.0 85045682057 Landfill leachate Oxidation treatment; PCA; Recalcitrant Comparison of different types of landfill leachate treatments by employment of nontarget screening to identify residual refractory organics and principal component analysis Pastore, C. and Barca, E. and Del Moro, G. and Di Iaconi, C. and Loos, M. and Singer, H.P. and Mascolo, G. Istituto di Ricerca Sulle Acque, Consiglio Nazionale delle Ricerche, Viale F. De Blasio 5, Bari, 70132, Italy; Eawag Swiss Federal Institute of Aquatic Science and Technology, berlandstrasse 133, D bendorf, CH 8600, Switzerland Three different chemical oxidation processes were investigated in terms of their capability to degrade organic chemical components of real mature landfill leachate in combination with biological treatment run in a Sequencing Batch Biofilter Granular Reactor SBBGR . H2O2, H2O2 UV and O3 were integrated with SBBGR and respective effluents were analyzed and compared with the effluent obtained from biological SBBGR treatment alone. In agreement with their respective oxidative power, conventional bulk parameters residual COD, TOC, Ntot, TSS determined from the resulting effluents evidenced the following efficacy ranking for degradation SBBGR/O3 gt; SBBGR/UV H2O2 gt; SBBGR/H2O2 gt; SBBGR. A more detailed characterization of the organic compounds was subsequently carried out for the four treated streams. For this, effluents were first subjected to a sample preparation step, allowing for a classification in terms of acidic, basic, strongly acidic and strongly basic compounds, and finally to analysis by liquid chromatography/high resolution mass spectrometry LC/HR MS . This classification, combined with further data post processing non target screening, Venn Diagram, tri dimensional plot and Principal Component Analysis , evidenced that the SBBGR/H2O2 process is comparable to the pure biological oxidation. In contrast, SBBGR/O3 and SBBGR/UV H2O2 not only resulted in a very different residual composition as compared to SBBGR and SBBGR/H2O2, but also differ significantly from each other. In fact, and despite of the SBBGR/O3 being the most efficient process, this treatment remained chemically more similar to SBBGR/H2O2 than to SBBGR/UV H2O2. This finding may be attributable to different mechanism of degradation involved with the use of UV radiation. Apart from these treatment differences, a series of recalcitrant compounds was determined in all of the four treatments and partly identified as hetero poly aromatic species humic acids like species . 2018 Elsevier B.V. 635 Published version https //www.scopus.com/inward/record.uri eid=2 s2.0 85045682057 doi=10.1016%2fj.scitotenv.2018.04.135 partnerID=40 md5=774cbbab040141f9213d1d40c53d8a5b cited By 2 Articolo in rivista Elsevier 0048 9697 Science of the total environment Science of the total environment Sci. total environ. claudio.diiaconi DI IACONI CLAUDIO emanuele.barca BARCA EMANUELE carlo.pastore PASTORE CARLO guido.delmoro DEL MORO GUIDO giuseppe.mascolo MASCOLO GIUSEPPE |
