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Open AccessFeature PaperArticle

Biofouling Formation and Bacterial Community Structure in Hybrid Moving Bed Biofilm Reactor-Membrane Bioreactors: Influence of Salinity Concentration

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Institute of Water Research, C/Ramon y Cajal, 4, University of Granada, 18071 Granada, Spain
2
Department of Civil Engineering, Campus of Fuentenueva, s/n, University of Granada, 18017 Granada, Spain
3
Department of Chemical and Environmental Engineering, University of Oviedo, 33006 Oviedo, Spain
4
Faculty of Pharmacy, Campus of Cartuja, s/n, University of Granada, 18017 Granada, Spain
5
Department of Mineralogy and Petrology, Campus of Fuentenueva, s/n, University of Granada, 18017 Granada, Spain
*
Author to whom correspondence should be addressed.
Water 2018, 10(9), 1133; https://doi.org/10.3390/w10091133
Received: 20 July 2018 / Revised: 19 August 2018 / Accepted: 23 August 2018 / Published: 25 August 2018
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 α-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. View Full-Text
Keywords: biofouling; bio-precipitation; calcite; MBBR-MBR; salinity wastewater; struvite biofouling; bio-precipitation; calcite; MBBR-MBR; salinity wastewater; struvite
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MDPI and ACS Style

Rodriguez-Sanchez, A.; Leyva-Diaz, J.C.; Muñoz-Palazon, B.; Rivadeneyra, M.A.; Hurtado-Martinez, M.; Martin-Ramos, D.; Gonzalez-Martinez, A.; Poyatos, J.M.; Gonzalez-Lopez, J. Biofouling Formation and Bacterial Community Structure in Hybrid Moving Bed Biofilm Reactor-Membrane Bioreactors: Influence of Salinity Concentration. Water 2018, 10, 1133.

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