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Multistage treatment system for raw leachate from sanitary landfill combining biological nitrification-denitrification/solar photo-Fenton/biological processes, at a scale close to industrial--biodegradability enhancement and evolution profile of trace pollutants.
Water Res. 2013 Oct 15; 47(16):6167-86.WR

Abstract

A multistage treatment system, at a scale close to the industrial, was designed for the treatment of a mature raw landfill leachate, including: a) an activated sludge biological oxidation (ASBO), under aerobic and anoxic conditions; b) a solar photo-Fenton process, enhancing the bio-treated leachate biodegradability, with and without sludge removal after acidification; and c) a final polishing step, with further ASBO. The raw leachate was characterized by a high concentration of humic substances (HS) (1211 mg CHS/L), representing 39% of the dissolved organic carbon (DOC) content, and a high nitrogen content, mainly in the form of ammonium nitrogen (>3.8 g NH4(+)-N/L). In the first biological oxidation step, a 95% removal of total nitrogen and a 39% mineralization in terms of DOC were achieved, remaining only the recalcitrant fraction, mainly attributed to HS (57% of DOC). Under aerobic conditions, the highest nitrification rate obtained was 8.2 mg NH4(+)-N/h/g of volatile suspended solids (VSS), and under anoxic conditions, the maximum denitrification rate obtained was 5.8 mg (NO2(-)-N + NO3(-)-N)/h/g VSS, with a C/N consumption ratio of 2.4 mg CH3OH/mg (NO2(-)-N + NO3(-)-N). The precipitation of humic acids (37% of HS) after acidification of the bio-treated leachate corresponds to a 96% DOC abatement. The amount of UV energy and H2O2 consumption during the photo-Fenton reaction was 30% higher in the experiment without sludge removal and, consequently, the reaction velocity was 30% lower. The phototreatment process led to the depletion of HS >80%, of low-molecular-weight carboxylate anions >70% and other organic micropollutants, thus resulting in a total biodegradability increase of >70%. The second biological oxidation allowed to obtain a final treated leachate in compliance with legal discharge limits regarding water bodies (with the exception of sulfate ions), considering the experiment without sludge. Finally, the high efficiency of the overall treatment process was further reinforced by the total removal percentages attained for the identified organic trace contaminants (>90%).

Authors+Show Affiliations

LSRE - Laboratory of Separation and Reaction Engineering, Associate Laboratory LSRE/LCM, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

23954067

Citation

Silva, Tânia F C V., et al. "Multistage Treatment System for Raw Leachate From Sanitary Landfill Combining Biological Nitrification-denitrification/solar photo-Fenton/biological Processes, at a Scale Close to Industrial--biodegradability Enhancement and Evolution Profile of Trace Pollutants." Water Research, vol. 47, no. 16, 2013, pp. 6167-86.
Silva TF, Silva ME, Cunha-Queda AC, et al. Multistage treatment system for raw leachate from sanitary landfill combining biological nitrification-denitrification/solar photo-Fenton/biological processes, at a scale close to industrial--biodegradability enhancement and evolution profile of trace pollutants. Water Res. 2013;47(16):6167-86.
Silva, T. F., Silva, M. E., Cunha-Queda, A. C., Fonseca, A., Saraiva, I., Sousa, M. A., Gonçalves, C., Alpendurada, M. F., Boaventura, R. A., & Vilar, V. J. (2013). Multistage treatment system for raw leachate from sanitary landfill combining biological nitrification-denitrification/solar photo-Fenton/biological processes, at a scale close to industrial--biodegradability enhancement and evolution profile of trace pollutants. Water Research, 47(16), 6167-86. https://doi.org/10.1016/j.watres.2013.07.036
Silva TF, et al. Multistage Treatment System for Raw Leachate From Sanitary Landfill Combining Biological Nitrification-denitrification/solar photo-Fenton/biological Processes, at a Scale Close to Industrial--biodegradability Enhancement and Evolution Profile of Trace Pollutants. Water Res. 2013 Oct 15;47(16):6167-86. PubMed PMID: 23954067.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Multistage treatment system for raw leachate from sanitary landfill combining biological nitrification-denitrification/solar photo-Fenton/biological processes, at a scale close to industrial--biodegradability enhancement and evolution profile of trace pollutants. AU - Silva,Tânia F C V, AU - Silva,M Elisabete F, AU - Cunha-Queda,A Cristina, AU - Fonseca,Amélia, AU - Saraiva,Isabel, AU - Sousa,M A, AU - Gonçalves,C, AU - Alpendurada,M F, AU - Boaventura,Rui A R, AU - Vilar,Vítor J P, Y1 - 2013/07/31/ PY - 2013/05/09/received PY - 2013/07/17/revised PY - 2013/07/23/accepted PY - 2013/8/20/entrez PY - 2013/8/21/pubmed PY - 2014/5/16/medline KW - Anoxic/aerobic biological treatment KW - Biodegradability enhancement KW - Organic micropollutants KW - Pre-industrial scale plant KW - Sanitary landfill raw leachate KW - Solar-driven photo-Fenton SP - 6167 EP - 86 JF - Water research JO - Water Res VL - 47 IS - 16 N2 - A multistage treatment system, at a scale close to the industrial, was designed for the treatment of a mature raw landfill leachate, including: a) an activated sludge biological oxidation (ASBO), under aerobic and anoxic conditions; b) a solar photo-Fenton process, enhancing the bio-treated leachate biodegradability, with and without sludge removal after acidification; and c) a final polishing step, with further ASBO. The raw leachate was characterized by a high concentration of humic substances (HS) (1211 mg CHS/L), representing 39% of the dissolved organic carbon (DOC) content, and a high nitrogen content, mainly in the form of ammonium nitrogen (>3.8 g NH4(+)-N/L). In the first biological oxidation step, a 95% removal of total nitrogen and a 39% mineralization in terms of DOC were achieved, remaining only the recalcitrant fraction, mainly attributed to HS (57% of DOC). Under aerobic conditions, the highest nitrification rate obtained was 8.2 mg NH4(+)-N/h/g of volatile suspended solids (VSS), and under anoxic conditions, the maximum denitrification rate obtained was 5.8 mg (NO2(-)-N + NO3(-)-N)/h/g VSS, with a C/N consumption ratio of 2.4 mg CH3OH/mg (NO2(-)-N + NO3(-)-N). The precipitation of humic acids (37% of HS) after acidification of the bio-treated leachate corresponds to a 96% DOC abatement. The amount of UV energy and H2O2 consumption during the photo-Fenton reaction was 30% higher in the experiment without sludge removal and, consequently, the reaction velocity was 30% lower. The phototreatment process led to the depletion of HS >80%, of low-molecular-weight carboxylate anions >70% and other organic micropollutants, thus resulting in a total biodegradability increase of >70%. The second biological oxidation allowed to obtain a final treated leachate in compliance with legal discharge limits regarding water bodies (with the exception of sulfate ions), considering the experiment without sludge. Finally, the high efficiency of the overall treatment process was further reinforced by the total removal percentages attained for the identified organic trace contaminants (>90%). SN - 1879-2448 UR - https://www.unboundmedicine.com/medline/citation/23954067/Multistage_treatment_system_for_raw_leachate_from_sanitary_landfill_combining_biological_nitrification_denitrification/solar_photo_Fenton/biological_processes_at_a_scale_close_to_industrial__biodegradability_enhancement_and_evolution_profile_of_trace_pollutants_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0043-1354(13)00611-8 DB - PRIME DP - Unbound Medicine ER -