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Characteristics of biofilms and iron corrosion scales with ground and surface waters in drinking water distribution systems
The composition of biofilm bacterial communities and iron corrosion scales were studied in two drinking water distribution systems transporting groundwater (DWDS-GW) and surface water (DWDS-SW). Loose corrosion products were formed containing α-FeOOH in DWDS-GW, while dense crystallized particles were formed in DWDS-SW, including α-FeOOH, Fe3O4 and CaCO3. In sanitized SW, α-FeOOH and CaCO3 were formed with a loose and porous morphology with a BET surface area of 50.8 m²g-¹. These results indicated that microorganisms played a larger role in the formation of Fe3O4 and the properties of the corrosion layer than water chemical parameters. The total biomass, including total microorganisms and denitrifying functional bacteria, in the effluent of the GW DWDSs was much larger than in the SW DWDSs due to the loose corrosion layer in the GW DWDSs.The biofilms in the two systems had the same bacterial diversity, denitrifying functional genes and 16S rRNA gene copies, but the bacterial communities were very different. With formation of the corrosion layer, the dominant corrosion-related bacteria were IOB Sediminibacterium (30.1%), IRB Geothrix (12.4%), and NRB associated with iron redox cycling (NRB-Fe) (20%), including Azospira, Dechloromonas and Zoogloea within the biofilm in DWDS-GW at 220 d, and NRBFe (64.7%) were dominant, including the above NRB-Fe and Rhodopseudomonas, in DWDS-SW. It was found that nitrate-reducing bacteria in biofilms that are associated with iron cycling played a large role in the formation of Fe3O4 and corrosion layers.
Characteristics of biofilms and iron corrosion scales with ground and surface waters in drinking water distribution systems
The composition of biofilm bacterial communities and iron corrosion scales were studied in two drinking water distribution systems transporting groundwater (DWDS-GW) and surface water (DWDS-SW). Loose corrosion products were formed containing α-FeOOH in DWDS-GW, while dense crystallized particles were formed in DWDS-SW, including α-FeOOH, Fe3O4 and CaCO3. In sanitized SW, α-FeOOH and CaCO3 were formed with a loose and porous morphology with a BET surface area of 50.8 m²g-¹. These results indicated that microorganisms played a larger role in the formation of Fe3O4 and the properties of the corrosion layer than water chemical parameters. The total biomass, including total microorganisms and denitrifying functional bacteria, in the effluent of the GW DWDSs was much larger than in the SW DWDSs due to the loose corrosion layer in the GW DWDSs.The biofilms in the two systems had the same bacterial diversity, denitrifying functional genes and 16S rRNA gene copies, but the bacterial communities were very different. With formation of the corrosion layer, the dominant corrosion-related bacteria were IOB Sediminibacterium (30.1%), IRB Geothrix (12.4%), and NRB associated with iron redox cycling (NRB-Fe) (20%), including Azospira, Dechloromonas and Zoogloea within the biofilm in DWDS-GW at 220 d, and NRBFe (64.7%) were dominant, including the above NRB-Fe and Rhodopseudomonas, in DWDS-SW. It was found that nitrate-reducing bacteria in biofilms that are associated with iron cycling played a large role in the formation of Fe3O4 and corrosion layers.
Characteristics of biofilms and iron corrosion scales with ground and surface waters in drinking water distribution systems
Charakterisierung von Biofilmen und Eisenkorrosionsbelägen mit Grund- und Oberflächenwässern in Trinkwasserverteilungssystemen
Li, Xiaoxiao (author) / Wang, Haibo (author) / Hu, Chun (author) / Yang, Min (author) / Hu, Hongying (author) / Niu, Junfeng (author)
Corrosion Science ; 90 ; 331-339
2014
9 Seiten, 8 Bilder, 7 Tabellen, 52 Quellen
Article (Journal)
English
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