Coupled electrochemical crystallization-electrocoagulation-flocculation process for efficient removal of hardness and silica from reverse osmosis concentrate

Wang, Xuesong; Sun, Xianpeng; Liu, Qiannan; Liu, Yijie; Li, Yifan; Wang, Weiliang; Feng, Ziyan; Song, Wenqing; Jiang, Bo

doi:10.1016/j.desal.2024.117549

Cited by 3 publications

(1 citation statement)

References 38 publications

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“…From Section 3.3, when only CP was used to treat the external drainage water, the removal of calcium and magnesium ions were 85.61% and 82.80%, respectively, at a RT of 60 min. When only using EC to treat wastewater containing calcium and magnesium ions, Elbert M. Nigri et al found that the removal rate of calcium could reach 88% after a CD of 17.5 mA/cm 2 and a RT of 40 min [56]; Xuesong Wang et al found that the magnesium hardness removal efficiency reached 73% after a CD of 20 mA/cm 2 and a RT of 90 min [57]. In Section 3.4, when CP was coupled with EC, the removal rates of calcium and magnesium ions reached about 90% at a RT of 30 min.…”

Section: Investigation Of the Removal Effect Of Calcium And Magnesium...mentioning

confidence: 99%

Research on Carbon Dioxide-Assisted Electrocoagulation Technology for Treatment of Divalent Cations in Water

Chang,

Li,

Guo

et al. 2024

Water

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In the external drainage water of Xinjiang Karamay Petrochemical Company, the calcium and magnesium ion contents are as high as 630 mg/L and 1170 mg/L, respectively. These ions are subsequently scaled at large quantities in water treatment equipment, which greatly reduces the efficiency of the process. This study used a coupled chemical precipitation (CP) and electrocoagulation (EC) method to deal with external drainage water. The results show that the removal rates of calcium and magnesium were 94.71% and 96.33%, respectively, when the pH was adjusted with sodium silicate and EC was introduced after saturating the water samples with CO2. In this study, a quadratic polynomial equation was developed for predicting the removal of calcium and magnesium ions using this coupled technique under three factors of current density (CD) (15, 20 and 25 mA/cm2), reaction time (RT) (30, 40 and 50 min) and pH (10.0, 10.5 and 11.0). It was found that these three variables have a significant effect on the removal of both the abovementioned ions. The response surface method based on a Box–Behnken design showed that the average removal rates of calcium and magnesium ions could be 96.57% and 98.66% at a CD of 22 mA/cm2, RT of 46 min and pH of 11. This study confirmed the presence of calcium carbonate in the solid product through XRD and SEM analysis. The results indicate that this study is promising, and the developed technique can also be used to remove the high concentrations of calcium and magnesium ions from different wastewaters.

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Section: Investigation Of the Removal Effect Of Calcium And Magnesium...mentioning

confidence: 99%

Research on Carbon Dioxide-Assisted Electrocoagulation Technology for Treatment of Divalent Cations in Water

Chang,

Li,

Guo

et al. 2024

Water

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Simultaneous removal of silicon impurities and hardness from high-temperature heavy-oil-produced-water by chemical coagulation-assisted electrocoagulation: Performance, kinetics, optimization and operational costs

Bai,

Zhou,

Wang

et al. 2024

Desalination and Water Treatment

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Improvement of Electrochemical Water Softening Treatment Using Activated Carbon Plates in High Hardness and Low Alkalinity Water: Enhancing the Electrochemical Treatment Effect While Reducing the Corrosiveness of the Water

Wang,

Yuan

et al. 2024

Preprint

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Coupled electrochemical crystallization-electrocoagulation-flocculation process for efficient removal of hardness and silica from reverse osmosis concentrate

Cited by 3 publications

References 38 publications

Research on Carbon Dioxide-Assisted Electrocoagulation Technology for Treatment of Divalent Cations in Water

Research on Carbon Dioxide-Assisted Electrocoagulation Technology for Treatment of Divalent Cations in Water

Simultaneous removal of silicon impurities and hardness from high-temperature heavy-oil-produced-water by chemical coagulation-assisted electrocoagulation: Performance, kinetics, optimization and operational costs

Improvement of Electrochemical Water Softening Treatment Using Activated Carbon Plates in High Hardness and Low Alkalinity Water: Enhancing the Electrochemical Treatment Effect While Reducing the Corrosiveness of the Water

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