Estimation of Pollutants Leaching from Cement Coating to Water After Pipe Renovation Based on Laboratory Experiments

Młyńska, Anna; Zielina, Michał

doi:10.1002/clen.201800267

Cited by 3 publications

(6 citation statements)

References 10 publications

(11 reference statements)

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“…[19,20] This is mainly due to the dissolution and leaching of some chemical elements from the protective mortar coatings into the drinking water. [13,21] In general, the quality of the water after contact with the coatings is dependent on the composition of the cement used. [13,19] The use of fly ash in mortar, for example, contributes to the leaching of some toxic ash components such as arsenic into drinking water.…”

Section: Introductionmentioning

confidence: 99%

“…[ 13,21 ] In general, the quality of the water after contact with the coatings is dependent on the composition of the cement used. [ 13,19 ] The use of fly ash in mortar, for example, contributes to the leaching of some toxic ash components such as arsenic into drinking water.…”

Section: Introductionmentioning

confidence: 99%

“…It should be noted that mortar lining is also typically used for renovation pipes. [13,14] Many studies indicate that mineral additives such as silica fume and fly ash can be used to prevent the deterioration of reinforced concrete structures exposed to extreme aggressive environments because they produce structures with finer pore structures and lower chloride diffusion coefficients than plain cement mixtures. [15][16][17][18] Although these mineral additives improve the durability of PCCP pipelines as expected, their use may have an impact on the quality of the transported drinking water.…”

Section: Introductionmentioning

confidence: 99%

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Investigating the possibility of PCCP mortar coating leaching and the impact on drinking water quality

Hassi

Menu²,

Javanmardi

et al. 2023

CLEAN Soil Air Water

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The objective of this article was to investigate the potential for the dissolution and leaching of certain chemical elements from the protective mortar coatings of prestressed concrete cylinder pipe (PCCP) into drinking water in the event of leakage and how this might affect the overall quality of the water delivered to consumers. The mortars as linings are also typically used for renovation of old pipes. Samples from three frequently used mortar coating mixtures underwent immersion in water after 28 days of curing and were monitored for 430 days. The water was tested for pH levels and the presence of aluminum, chromium, lead, and iron, in accordance with the standards set for human consumption in Moroccan and other countries such as Australia, Canada, and the United States, as well as organizations such as the European Union and World Health Organization. The results indicate that the highest levels of aluminum, iron, chromium, and lead leaching occurred after the initial contact with water, gradually declining over time. Furthermore, the inclusion of silica fume and fly ash in the coating increases the potential for chemical element leaching. Additionally, preinstallation pipeline washing demonstrates its effectiveness in reducing the leaching of chemical elements into drinking water in the event of leakages. The overall results suggest that the likelihood of contamination of drinking water by leaching of chemical elements from the mortar coating in case of a leakage appears to be negligible under the studied conditions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigating the possibility of PCCP mortar coating leaching and the impact on drinking water quality

Hassi

Menu²,

Javanmardi

et al. 2023

CLEAN Soil Air Water

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“…Ductile iron pipes are currently used in large quantities for the construction and rehabilitation of DWDS because of their excellent rigidity and ductility, , and their normal size covers a wide range from 3 to 64 in . As ductile iron pipes are prone to corrosion during use, it is common to coat a lining inside the pipeline, which could be made of plastic, epoxy resin, polyurethane, cement mortar, and other materials. , Among them, cement mortar lining (CML) is most popularly used as a lining of ductile iron pipes, and cement mortar is also used for nonexcavation repair of old cast iron pipelines due to its low price and good anticorrosion performance. − …”

Section: Introductionmentioning

confidence: 99%

Stability of Cement Mortar Lining in Drinking Water Supply Pipelines under Different Hardness and Alkalinity Conditions

et al. 2022

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Cement mortar lined iron pipes are widely used in drinking water distributions systems (DWDS), but the quantitative evaluation of chemical stability of the cement mortar lining (CML) under different drinking water conditions is still scarce. Here, we established pipe reactors using DN100 cement mortar lined ductile iron pipe to investigate the pipe material leaching into water and the corresponding changes in surface properties under a wide range of hardnesses (0−330 mg/L as CaCO 3 ) and alkalinities (0−250 mg/L as CaCO 3 ). Results showed that drinking water with hardness and alkalinity of higher than 30 mg/L can markedly decrease CML material release via the formation of a calcium carbonate layer. The thickness of the calcium carbonate precipitation layer and the corrosion affected depth of CML were dependent on the concentration levels of water hardness and alkalinity. CML contacted with low alkalinity and low hardness water (A30H30) was affected to a depth of about 71 μm and a precipitation layer thickness of about 11 μm formed on the surface, while the CML contacted with high alkalinity and moderate hardness water (A250H160) was affected to a depth of 37 μm and a precipitation layer thickness of 41 μm. More importantly, the formation of the calcium carbonate layer by Ca 2+ migration from both sides of the CML− water interface could occur even if the initial water CCPP (calcium carbonate precipitation potential) was negative, which expanded the range of water quality suitable for CML pipe application.

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“…Biologically stable water should not support any adverse changes in bacteriological parameters [14,15]. In turn, lack of chemical water stability, as determined by some physico-chemical water indices, may lead to the electrochemical corrosion of metallic surfaces, or as was mentioned earlier, to calcium compounds being deposited and leached from pipes [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Contamination of drinking water soon after cement mortar lining renovation depending on the disinfectant doses

2019

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The quality of water transported through freshly cemented water pipes depends not only on the type of cement used. The other factor affecting the degree of leaching pollutants from cement coatings is the chemical parameters of the water. A disinfection process is necessary for maintaining water which is safe for human health and high quality. However, simultaneously, the presence of disinfectant in water may cause some problems. The results of the experiments performed showed that independently of the concentration of sodium hypochlorite in water, rapid changes of water pH soon after cement mortar lining renovation may always be expected. The addition of disinfectant to water causes an increase in pollutants leaching from cement coatings, even in the case of a low disinfectant dose. Although the concentration of disinfectant in water has a differential impact on the degree of pollutants leaching from cement coatings, the increase in the leaching of the pollutants is not proportional to the disinfectant concentration.

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Estimation of Pollutants Leaching from Cement Coating to Water After Pipe Renovation Based on Laboratory Experiments

Cited by 3 publications

References 10 publications

Investigating the possibility of PCCP mortar coating leaching and the impact on drinking water quality

Investigating the possibility of PCCP mortar coating leaching and the impact on drinking water quality

Stability of Cement Mortar Lining in Drinking Water Supply Pipelines under Different Hardness and Alkalinity Conditions

Contamination of drinking water soon after cement mortar lining renovation depending on the disinfectant doses

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