Influence of the Mixing Energy Consumption Affecting Coagulation and Floc Aggregation

Vadasarukkai, Yamuna S.; Gagnon, Graham A.

doi:10.1021/acs.est.6b06281

Cited by 17 publications

(5 citation statements)

References 44 publications

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“…Median aluminum was highest in February and lowest in July: 182 and 32 μg L –1 , respectively. The aluminum residual in treated water is generally highest when water temperature is lowest, due largely to the inverse temperature dependence of aluminum hydroxide solubility at the median coagulation pH of 5.75. ,, Median water temperatures in these two months were 5 and 20 °C.…”

Section: Resultsmentioning

confidence: 99%

Seasonal Lead Release into Drinking Water and the Effect of Aluminum

et al. 2022

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Monitoring lead in drinking water is important for public health, but seasonality in lead concentrations can bias monitoring programs if it is not understood and accounted for. Here, we describe an apparent seasonal pattern in lead release into orthophosphate-treated drinking water, identified through point-of-use sampling at sites in Halifax, Canada, with various sources of lead. Using a generalized additive model, we extracted the seasonally varying components of time series representing a suite of water quality parameters and we identified aluminum as a correlate of lead. To investigate aluminum’s role in lead release, we modeled the effect of variscite (AlPO 4 ·2H 2 O) precipitation on lead solubility, and we evaluated the effects of aluminum, temperature, and orthophosphate concentration on lead release from new lead coupons. At environmentally relevant aluminum and orthophosphate concentrations, variscite precipitation increased predicted lead solubility by decreasing available orthophosphate. Increasing the aluminum concentration from 20 to 500 μg L –1 increased lead release from coupons by 41% and modified the effect of orthophosphate, rendering it less effective. We attributed this to a decrease in the concentration of soluble (<0.45 μm) phosphorus with increasing aluminum and an accompanying increase in particulate lead and phosphorus (>0.45 μm).

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Section: Resultsmentioning

confidence: 99%

Seasonal Lead Release into Drinking Water and the Effect of Aluminum

et al. 2022

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“…The aluminum residual in treated water is generally highest when water temperature is lowest, 21 due largely to the inverse temperature dependence of aluminum hydroxide solubility at the median coagulation pH of 5.75. 6,48,49 Median water temperature in these two months was 5 and 20°C. Orthophosphate also exhibited a seasonal pattern.…”

Section: Aluminum and Orthophosphate Seasonality In The Distribution Systemmentioning

confidence: 98%

Seasonal lead release to drinking water and the effect of aluminum

Trueman

Bleasdale-Pollowy

Locsin

et al. 2021

Preprint

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Monitoring lead in drinking water is important for public health, but seasonality in lead concentrations can bias monitoring programs if it is not understood and accounted for. Here, we describe an apparent seasonal pattern in lead release to orthophosphate-treated drinking water, identified through point-of-use sampling at sites in Halifax, Canada, with various sources of lead. Using a generalized additive model, we extracted the seasonally-varying components of time series representing a suite of water quality parameters and we identified aluminum as a correlate of lead. To investigate aluminum’s role in lead release, we modeled the effect of variscite (AlPO4 · 2H2O) precipitation on lead solubility, and we evaluated the effects of aluminum, temperature, and orthophosphate concentration on lead release from new lead coupons. At environmentally relevant aluminum and orthophosphate concentrations, variscite precipitation increased predicted lead solubility by decreasing available orthophosphate. Increasing the aluminum concentration from 20–500 µg L-1 increased lead release from coupons by 41% and modified the effect of orthophosphate, rendering it less effective. We attributed this to a decrease in the concentration of soluble (<0.45 µm) phosphorus with increasing aluminum and an accompanying increase in particulate lead and phosphorus (>0.45 µm).

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“…According to previous research, taking Cladophora aegagropila as the research object, the removal efficiency of algal cells with a low Fe(VI) concentration (0.78 mM) under static conditions was only 16% after 300 min [27], while the removal efficiency in a stirred (dynamic) system was 30%. When Fe(VI) concentration was increased to 1.55 mM, about 60% of algal cells were damaged [30,31]. Agitation increased the probability of collision between algal cells and Fe(VI) particles [32], increasing the oxidation rate and enhancing the coagulation effect [33,34].…”

Section: Factors Affecting Fe(vi) Removal Efficiencymentioning

confidence: 99%

The Role of Ferrate (VI) in the Pretreatment of Algal Cells and Algal Organic Matters: A Review

Wang,

Yang,

Chen

et al. 2024

Water

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Algal blooms are caused by excessive levels of nitrogen, phosphorus, and other plant nutrients in water. Algae and algal organic matter (AOM) pose a great threat to the quality of drinking water. This manuscript offers a systematic review of algal removal by ferrate (Fe(VI)) oxidation, including the conditions for the removal of different algae by Fe(VI) and the factors affecting the removal efficiency. On this basis, the oxidation and coagulation mechanisms of algae removal by Fe(VI) are discussed. Then, the review introduces the process combining Fe(VI) pre-oxidation with aluminum sulfate action. The addition of aluminum sulfate can further enhance the coagulation effect and reduce the formation of disinfection byproducts (DBPs) in the subsequent chlorination process by effectively removing AOM, which is recognized as a precursor of DBPs. In addition, recent studies on the combined application of Fe(VI) and Fe(II) are also reviewed. In a reasonable dose range, the synergistic effect of Fe(VI) and Fe(II) can significantly improve the removal of algae and algal toxins. Finally, this review provides a comprehensive evaluation of the applicability of Fe(VI) in removing algal material, offers guidance for the harmless treatment of algae with Fe(VI), and identifies future research questions.

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Influence of the Mixing Energy Consumption Affecting Coagulation and Floc Aggregation

Cited by 17 publications

References 44 publications

Seasonal Lead Release into Drinking Water and the Effect of Aluminum

Seasonal Lead Release into Drinking Water and the Effect of Aluminum

Seasonal lead release to drinking water and the effect of aluminum

The Role of Ferrate (VI) in the Pretreatment of Algal Cells and Algal Organic Matters: A Review

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