Biofouling Formation and Bacterial Community Structure in Hybrid Moving Bed Biofilm Reactor-Membrane Bioreactors: Influence of Salinity Concentration
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AuthorRodríguez-Sánchez, Alejandro; Leyva Díaz, Juan Carlos; Muñoz Palazón, Barbara; Rivadeneyra, María Angustías; Hurtado-Martinez, Miguel; Martín Ramos, José Daniel; González Martínez, Alejandro; Poyatos Capilla, José Manuel; Gonzalez-Lopez, Jesus
Rodriguez-Sanchez, A. [et al.]. Biofouling Formation and Bacterial Community Structure in Hybrid Moving Bed Biofilm Reactor-Membrane Bioreactors: Influence of Salinity Concentration. Water 2018, 10, 1133; doi:10.3390/w10091133.
SponsorshipThe authors would like to acknowledge the support given by the Institute of Water Research, the Department of Civil Engineering, the Department of Microbiology and the Department of Mineralogy and Petrology with all from the University of Granada. Additionally, they would like to acknowledge the economic support given by the Government of Spain and the Ministry of Economy and Competitivity under the funding project CTM2013-48154-P and grant BES-2014-067852.
Two pilot-scale hybrid moving bed biofilm reactor-membrane bioreactors were operated in parallel for the treatment of salinity-amended urban wastewater under 6 hours of hydraulic retention time and 2500 mg L-1 total solids concentration. Two salinity conditions were tested: the constant salinity of 6.5 mS cm-1 electric conductivity (3.6 g L-1 NaCl) and the tidal-like variable salinity with maximum 6.5 mS cm-1 electric conductivity. An investigation was developed on the biofouling produced on the ultrafiltration membrane surface evaluating its bacterial community structure and its potential function in the fouling processes. The results showed that biofouling was clearly affected by salinity scenarios in terms of a-diversity and β-diversity and bacterial community structure, which confirms lower bacterial diversity under variable salinity conditions with Rhodanobacter and Dyella as dominant phylotypes. Microorganisms identified as bio-mineral formers belonged to genera Bacillus, Citrobacter, and Brevibacterium. These findings will be of help for the prevention and control of biofouling in saline wastewater treatment systems.