Adrián M.T. Silva

Ana M.C. Carvalho

Helder T. Gomes

Joaquim L. Faria

José L. Figueiredo

Raquel O. Rodrigues

Rui S. Ribeiro

Portuguese

Repositório Aberto da Universidade do Porto

                       5th European Conference on  Environmental Applications  of Advanced Oxidation Processes  (EAAOP5)   Book of abstracts    Editor Josef Krýsa       Prague, Czech Republic, 2017   148 OPTIMIZATION OF MAGNETIC GRAPHITIC NANOCOMPOSITES FOR THE CATALYTIC WET PEROXIDE OXIDATION OF LIQUID EFFLUENTS FROM A MECHANICAL BIOLOGICAL TREATMENT PLANT FOR MUNICIPAL SOLID WASTE R. S. Ribeiroa,b, R. O. Rodriguesa,b, A. M. C. Carvalhoc, A. M. T. Silvab, J. L. Figueiredob,  J. L. Fariab, H. T. Gomesa   a Laboratory of Separation and Reaction Engineering – Laboratory of Catalysis and Materials (LSRE-LCM), Instituto Politécnico de Bragança, 5300-253 Bragança, Portugal, }rui.ribeiro@ipb.pt). b Laboratory of Separation and Reaction Engineering – Laboratory of Catalysis and Materials (LSRE-LCM), Faculdade de Engenharia, Universidade do Porto, 4200-465 Porto, Portugal c Resíduos do Nordeste, EIM, 5370-340 Mirandela, Portugal  Mechanical biological treatment (MBT) plants are an established option to limit the environmental impact of direct landfill disposal, while benefiting from resources and energy recovery. However, a significant amount of liquid stream with high pollutant load is usually generetared in MBT plants. In a previous work, a hybrid magnetic graphitic nanocomposite (MGNC) catalyst – composed by a magnetite core and a graphitic shell – revealed a high performance when applied in catalytic wet peroxide oxidation (CWPO) [1]. Seeking for MGNC catalyst optimization, nickel and cobalt ferrites were prepared in the present work and encapsulated within a carbon shell in addition to magnetite. The material composed by the cobalt ferrite core (CoFe2O4/MGNC) revealed a superior performance in CWPO, achieving a remarkable abatement of the liquid effluent collected from a MBT plant located in Portugal [9206 mg L-1 chemical oxygen demand (COD); 1933 mg L-1 biochemical oxygen demand; 2046 mg L-1 total organic carbon (TOC); 14350 mg L-1 bicarbonates; 3664 mg L-1 chlorides; 14.7 x 104 CFU mL-1 heterotrophic bacteria]. The results obtained in a series of CWPO runs performed at near neutral pH with consecutive reuse of CoFe2O4/MGNC are given in Figure 1. For that purpose, a magnetic separation system was applied for catalyst recovery after each cycle, the treated water being replaced by a fresh effluent sample. In addition, desinfection of the effluent was also achieved, the treated water revealing no toxicity against selected bacteria. Acknowledgments This work was supported by: Project POCI-01-45-FEDER-006984 – Associate Laboratory LSRE-LCM funded by FEDER through COMPETE2020 - Programa Operacional Competitividade e Internacionalização (POCI) – and by national funds through FCT - Fundação para a Ciência e a Tecnologia. R.S. Ribeiro and R.O. Rodrigues acknowledge the FCT individual Ph.D. grants SFRH/BD/94177/2013 and SFRH/BD/97658/2013, respectively, with financing from FCT and the European Social Fund (through POPH and QREN). A.M.T. Silva acknowledges the FCT Investigator 2013 Programme (IF/01501/2013), with financing from the European Social Fund and the Human Potential Operational Programme. References [1] R.S. Ribeiro, A.M.T. Silva, P.B. Tavares, J.L. Figueiredo, J.L. Faria, H.T. Gomes, Catal. Today 280 (2017) 184.    1st cycle 2nd cycle 3rd cycle 4th cycle 5th cycle0102030405060708090100 COD    TOC     H2O2     Aromaticity  Conversion (%)  SPC II-8 Figure 1. COD, TOC, H2O2 and aromaticity conversions obtained after 24 h in five CWPO runs performed with consecutive reuse of the CoFe2O4/MGNC catalyst, with pH  6 and T = 80 oC 

Optimization of magnetic graphitic nanocomposites for the catalytic wet peroxide oxidation of liquid effluents from a mechanical biological treatment plant for municipal solid waste

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Optimization of magnetic graphitic nanocomposites for the catalytic wet peroxide oxidation of liquid effluents from a mechanical biological treatment plant for municipal solid waste

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