Combination of advanced oxidation and biological processes for the landfill leachate treatment

Abstract This study’s main purpose is to contribute to the Oued Smar landfill leachate decontamination. To achieve this aim, the advanced oxidation process (AOP) via heterogeneous photocatalysis (TiO2/UV) was coupled with seeded bioreactors with different inoculums types (raw leachate, soil extract and activated sludge). The results obtained after heterogeneous photocatalysis show that the reduction is comprised between 50 and 84% of the initial COD maintained at pH 5. However, this treated leachate cannot be reused or discharged without another treatment into the environment. The new BOD5/COD ratio ranging between 0.045 and 0.18 are favorable for biological treatment. The AOP–bioreactor coupling allowed an abatement of 90% of the initial BOD5 and 87% of the initial COD leachate surface reduction with a final value of 1000 mg O2/L. However, this value is not yet conformed to the norm. The biological treatment has shown the landfill indigenous microorganism's ability to degrade the irradiated leachate since, the mineralization dissolved organic carbon (DOC) rate is almost identical to the value obtained by activated sludge. These results encourage the supposition to recycle the irradiated leachate in the landfill which now possess a biopile behavior (loop AOP + landfill).

[1]  Sung Pill Cho,et al.  Photocatalytic degradation of the landfill leachate containing refractory matters and nitrogen compounds , 2002 .

[2]  C. Pulgarin,et al.  Degradation of a biorecalcitrant dye precursor present in industrial wastewaters by a new integrated iron(III) photoassisted-biological treatment , 2003 .

[3]  Nadjib Drouiche,et al.  Rehabilitation of Oued Smar landfill into a recreation park: Treatment of the contaminated waters , 2013 .

[4]  Chiing-Chang Chen,et al.  Titanium dioxide-mediated heterogeneous photocatalytic degradation of terbufos: parameter study and reaction pathways. , 2009, Journal of hazardous materials.

[5]  A. Ledin,et al.  Xenobiotic organic compounds in leachates from ten Danish MSW landfills--chemical analysis and toxicity tests. , 2004, Water research.

[6]  T.A. Kurniawan,et al.  Removal of refractory compounds from stabilized landfill leachate using an integrated H2O2 oxidation and granular activated carbon (GAC) adsorption treatment. , 2009, Water research.

[7]  B. Xie,et al.  Treatment of mature landfill leachate by biofilters and Fenton oxidation. , 2010, Waste management.

[8]  Yi Zhang,et al.  Landfill CH4 oxidation and N2O emissions by aged refuse: Effects of wastewater NH4+-N incubation, heavy metals and pH , 2013 .

[9]  Isabel Saraiva,et al.  Treatment of a sanitary landfill leachate using combined solar photo-Fenton and biological immobilized biomass reactor at a pilot scale. , 2011, Water research.

[10]  Frederick Bloetscher,et al.  Application of photochemical technologies for treatment of landfill leachate. , 2012, Journal of hazardous materials.

[11]  Yuyang Long,et al.  Removal of dibutyl phthalate from refuse from different phases of landfill in the presence of its dominant bacterial strains , 2014 .

[12]  Joon-Seok Park,et al.  Bioremediation of diesel-contaminated soil with composting. , 2002, Environmental pollution.

[13]  P Moulin,et al.  Landfill leachate treatment: Review and opportunity. , 2008, Journal of hazardous materials.

[14]  Yang Deng,et al.  Sulfate radical-advanced oxidation process (SR-AOP) for simultaneous removal of refractory organic contaminants and ammonia in landfill leachate. , 2011, Water research.

[15]  E. Tiburtius,et al.  Treatment of gasoline-contaminated waters by advanced oxidation processes. , 2005, Journal of hazardous materials.

[16]  V. Vilar,et al.  Solar photo-Fenton as a pre-oxidation step for biological treatment of landfill leachate in a pilot plant with CPCs , 2011 .

[17]  R. Bauer.  Applicability of solar irradiation for photochemical wastewater treatment , 1994 .

[18]  Kazuyuki Suzuki,et al.  Performance evaluation of intermediate cover soil barrier for removal of heavy metals in landfill leachate. , 2008, Chemosphere.

[19]  M. I. Maldonado,et al.  Evaluating Microtox as a tool for biodegradability assessment of partially treated solutions of pesticides using Fe3+ and TiO2 solar photo-assisted processes. , 2008, Ecotoxicology and environmental safety.

[20]  Seung-Mok Lee,et al.  Removal of Cr(VI) and humic acid by using TiO2 photocatalysis. , 2006, Chemosphere.

[21]  G. Mascolo,et al.  Comparison of UV/H2O2 based AOP as an end treatment or integrated with biological degradation for treating landfill leachates , 2013 .

[22]  A. E. Greenberg,et al.  Standard methods for the examination of water and wastewater : supplement to the sixteenth edition , 1988 .

[23]  P. Zamora,et al.  Use of advanced oxidation processes to improve the biodegradability of mature landfill leachates. , 2005, Journal of hazardous materials.

[24]  S. Martin,et al.  Environmental Applications of Semiconductor Photocatalysis , 1995 .

[25]  G. Heron,et al.  Biogeochemistry of landfill leachate plumes , 2001 .

[26]  Jaime Giménez,et al.  The influence of different irradiation sources on the treatment of nitrobenzene , 2002 .

[27]  Sixto Malato,et al.  Comparison of several combined/integrated biological-AOPs setups for the treatment of municipal landfill leachate: Minimization of operating costs and effluent toxicity , 2011 .

[28]  Tonni Agustiono Kurniawan,et al.  Radicals-catalyzed oxidation reactions for degradation of recalcitrant compounds from landfill leachate , 2006 .

[29]  Yuqiu Wang,et al.  Directed synthesis of mesoporous TiO2 microspheres: catalysts and their photocatalysis for bisphenol A degradation. , 2010, Environmental science & technology.

[30]  Shaoqi Zhou,et al.  Transformation of pollutants in landfill leachate treated by a combined sequence batch reactor, coagulation, Fenton oxidation and biological aerated filter technology , 2011 .

[31]  Ahmet Demir,et al.  Metal concentrations of simulated aerobic and anaerobic pilot scale landfill reactors. , 2007, Journal of hazardous materials.

[32]  Yang Deng.  Advanced Oxidation Processes (AOPs) for reduction of organic pollutants in landfill leachate: a review , 2009 .

[33]  Rui A.R. Boaventura,et al.  Landfill leachate treatment by solar-driven AOPs , 2011 .

[34]  C. Pulgarin,et al.  Recent developments in the coupling of photoassisted and aerobic biological processes for the treatment of biorecalcitrant compounds , 2002 .

[35]  B. Mendes,et al.  Chemical and ecotoxicological properties of size fractionated biomass ashes , 2013 .

[36]  Luis F. Vilches,et al.  Photocatalytic degradation of humic acids and landfill leachate using a solid industrial by-product containing TiO2 and Fe , 2011 .

[37]  A. Fujishima,et al.  Degradation of bisphenol A in water by TiO2 photocatalyst. , 2001, Environmental science & technology.

[38]  S. Fuentes,et al.  Microbial community dynamics in a submerged fixed bed bioreactor during biological treatment of saline urban wastewater , 2014 .

[39]  I. Oller,et al.  Combination of Advanced Oxidation Processes and biological treatments for wastewater decontamination--a review. , 2011, The Science of the total environment.

[40]  Shaoqi Zhou,et al.  Transformation of metals speciation in a combined landfill leachate treatment. , 2011, The Science of the total environment.