Effect of biofilm on cast iron pipe corrosion in drinking water distribution system: Corrosion scales characterization and microbial community structure investigation

2008 ◽  
Vol 50 (10) ◽  
pp. 2816-2823 ◽  
Author(s):  
F. Teng ◽  
Y.T. Guan ◽  
W.P. Zhu
Keyword(s):  
Drinking Water ◽  
Community Structure ◽  
Cast Iron ◽  
Distribution System ◽  
Water Distribution ◽  
Water Distribution System ◽  
Drinking Water Distribution System ◽  
Structure Investigation ◽  
Drinking Water Distribution ◽  
Corrosion Scales

Characteristics of pipe-scale in the pipes of an urban drinking water distribution system in eastern China

2015 ◽  
Vol 16 (3) ◽  
pp. 715-726 ◽  
Author(s):  
Jingqing Liu ◽  
Huanyu Chen ◽  
Qian Huang ◽  
Liping Lou ◽  
Baolan Hu ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Drinking Water ◽  
Cast Iron ◽  
Distribution System ◽  
Water Distribution ◽  
Water Distribution System ◽  
Eastern China ◽  
Galvanized Steel ◽  
Drinking Water Distribution System ◽  
Drinking Water Distribution

Pipes that carry drinking water have gradually aged. Events occurring with increasing frequency, such as substandard water quality in residential taps, red water, and black water, reveal the deterioration of the chemical stability of a drinking water distribution system (DWDS). Pipes in the DWDS serving City S, located in eastern China, were sampled to analyze the concentration and distribution of pollutants in pipe-scale of pipes of different materials, ages and diameters, and the factors (such as materials, age, and diameter) influencing the accumulation of pollutants were also investigated. The quantity of pipe-scale in the most commonly used gray cast iron pipe and ductile cast iron pipe (DN150) was 151.5–195.0 g·m−1 and 7.1–29.4 g·m−1, respectively. The concentration of heavy metals in pipe-scale was positively correlated with the quantity of pipe-scale (R2 = 0.874); the sequence of concentration of metals was Fe > Al > Mn, Zn > Pb, Cu > Cr, Cd. Galvanized steel pipe, with the highest degree of corrosion, had the highest concentration of heavy metals in pipe-scale. The morphology and composition of pipe-scale were substantially influenced by pipe material and age. For example, in the oldest galvanized steel pipe-scale, there was not only a large number of iron compounds but also some zinc composite oxides. In addition to hydrocarbons produced by microbial metabolism, there were microalgae metabolites and exogenous contaminants such as polycyclic aromatic hydrocarbons (PAHs). The concentrations of microbial metabolites increased with increasing service time.

scholarly journals Bacterial composition in a metropolitan drinking water distribution system utilizing different source waters

2014 ◽  
Vol 13 (1) ◽  
pp. 140-151 ◽  
Author(s):  
Vicente Gomez-Alvarez ◽  
Ben W. Humrighouse ◽  
Randy P. Revetta ◽  
Jorge W. Santo Domingo
Keyword(s):  
Drinking Water ◽  
Community Structure ◽  
Distribution System ◽  
Water Distribution ◽  
Water Distribution System ◽  
Rrna Gene ◽  
Drinking Water Distribution System ◽  
Bacterial Composition ◽  
Service Areas ◽  
Drinking Water Distribution

We investigated the bacterial composition of water samples from two service areas within a drinking water distribution system (DWDS), each associated with a different primary source of water (groundwater, GW; surface water, SW) and different treatment process. Community analysis based on 16S rRNA gene clone libraries indicated that Actinobacteria (Mycobacterium spp.) and α-Proteobacteria represented nearly 43 and 38% of the total sequences, respectively. Sequences closely related to Legionella, Pseudomonas, and Vibrio spp. were also identified. In spite of the high number of sequences (71%) shared in both areas, multivariable analysis revealed significant differences between the GW and SW areas. While the dominant phylotypes where not significantly contributing in the ordination of samples, the populations associated with the core of phylotypes (1–10% in each sample) significantly contributed to the differences between both service areas. Diversity indices indicate that the microbial community inhabiting the SW area is more diverse and contains more distantly related species coexisting with local assemblages as compared with the GW area. The bacterial community structure of SW and GW service areas were dissimilar, suggesting that their respective source water and/or water quality parameters shaped by the treatment processes may contribute to the differences in community structure observed.

Persistence and decontamination of surrogate radioisotopes in a model drinking water distribution system

2009 ◽  
Vol 43 (20) ◽  
pp. 5005-5014 ◽  
Author(s):  
Jeffrey G. Szabo ◽  
Christopher A. Impellitteri ◽  
Shekar Govindaswamy ◽  
John S. Hall
Keyword(s):  
Drinking Water ◽  
Distribution System ◽  
Water Distribution ◽  
Water Distribution System ◽  
Drinking Water Distribution System ◽  
Drinking Water Distribution
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