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

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...

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Bibliographic Details
Published inWater (Basel) Vol. 10; no. 9; p. 1133
Main Authors Rodriguez-Sanchez, Alejandro, Leyva-Diaz, Juan, Muñoz-Palazon, Barbara, Rivadeneyra, Maria, Hurtado-Martinez, Miguel, Martin-Ramos, Daniel, Gonzalez-Martinez, Alejandro, Poyatos, Jose, Gonzalez-Lopez, Jesus
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.09.2018
Subjects
Bacteria
bio-precipitation
Biofilms
Biofouling
Bioreactors
calcite
Citrobacter
Communities
Community structure
Conductivity
Electrical resistivity
Environmental impact
Hydraulic retention time
Laboratories
MBBR-MBR
Membrane separation
Metabolism
Microorganisms
Minerals
Moving beds
Reactors
Retention time
Salinity
Salinity effects
salinity wastewater
Sludge
Sodium chloride
struvite
Ultrafiltration
Wastewater treatment
Water treatment plants
Spain
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Summary: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.
ISSN:2073-4441
2073-4441
DOI:10.3390/w10091133