A combined system comprising a hybrid anaerobic digester(HD),a vertical subsurface flow constructed wetland(VF),and a heterogeneous photocatalysis unit was evaluated at pilot-scale for the elimination of faecal indica...A combined system comprising a hybrid anaerobic digester(HD),a vertical subsurface flow constructed wetland(VF),and a heterogeneous photocatalysis unit was evaluated at pilot-scale for the elimination of faecal indicator microorganisms—total coliforms,Escherichia coli and Clostridium perfringens.The VF effluent was subjected to laboratory-scale experiments using different photodegradation post-treatments:UVC photolysis,heterogeneous photocatalysis with ultraviolet light(UVA/TiO_(2)),and sunlight-driven heterogeneous photocatalysis(Sol/TiO_(2)).Subsequently,the Sol/TiO_(2) system was scaled up and implemented at pilot-scale(p.Sol/TiO_(2)).The total footprint of the combined HD+VF+p.Sol/TiO_(2) system was 4.4 m^(2).Under continuous operation,the combined HD+VF system was able to remove approximately 1.0,1.3 and 1.1 log units for total coliforms,E.coli and C.perfringens,respectively,with the VF unit accounting for more than 80%of the overall elimination during biological treatment.Laboratory-scale experiments showed high removal efficiency,following the order UVC>UVA/TiO_(2)>Sol/TiO_(2).In contrast,the p.Sol/TiO_(2) post-treatment(after 2 h of exposure)achieved lower removals of approximately 0.5,1.2 and 0.1 log units for total coliforms,E.coli and C.perfringens,respectively.To our knowledge,this is the first study on the combination of VF constructed wetlands and photodegradation processes with the aim of improving the quality of reclaimed water for potential reuse.As a general conclusion,the photocatalysis pond employed in the present study improved the quality of the VF effluent,widening the possibilities for reuse of the reclaimed water.展开更多
基金project CTQ2015-71238-R(MINECO/FEDER,funded by the Spanish Ministerio de Economía y Competitividad)the project TED2021-132667B-I00 funded by MCIN/AEI/10.13039/501100011033 and by the European Union“NextGenerationEU”/PRTR.
文摘A combined system comprising a hybrid anaerobic digester(HD),a vertical subsurface flow constructed wetland(VF),and a heterogeneous photocatalysis unit was evaluated at pilot-scale for the elimination of faecal indicator microorganisms—total coliforms,Escherichia coli and Clostridium perfringens.The VF effluent was subjected to laboratory-scale experiments using different photodegradation post-treatments:UVC photolysis,heterogeneous photocatalysis with ultraviolet light(UVA/TiO_(2)),and sunlight-driven heterogeneous photocatalysis(Sol/TiO_(2)).Subsequently,the Sol/TiO_(2) system was scaled up and implemented at pilot-scale(p.Sol/TiO_(2)).The total footprint of the combined HD+VF+p.Sol/TiO_(2) system was 4.4 m^(2).Under continuous operation,the combined HD+VF system was able to remove approximately 1.0,1.3 and 1.1 log units for total coliforms,E.coli and C.perfringens,respectively,with the VF unit accounting for more than 80%of the overall elimination during biological treatment.Laboratory-scale experiments showed high removal efficiency,following the order UVC>UVA/TiO_(2)>Sol/TiO_(2).In contrast,the p.Sol/TiO_(2) post-treatment(after 2 h of exposure)achieved lower removals of approximately 0.5,1.2 and 0.1 log units for total coliforms,E.coli and C.perfringens,respectively.To our knowledge,this is the first study on the combination of VF constructed wetlands and photodegradation processes with the aim of improving the quality of reclaimed water for potential reuse.As a general conclusion,the photocatalysis pond employed in the present study improved the quality of the VF effluent,widening the possibilities for reuse of the reclaimed water.
