Growth and structure of flocs following electrocoagulation

Lee, Sin Yin; Gagnon, Graham A.

doi:10.1016/j.seppur.2016.02.049

Cited by 48 publications

(8 citation statements)

References 29 publications

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“…The size range of the DIHM was suitable to measure flocs larger than 50 μm, which are the major source contributing toward total surface area, volume, and mass of flocs. 51 Further analysis, using a Malvern Mastersizer 3000 52 and/or Zetasizer nano, 44 is recommended to examine the small floc size distribution that may have resulted at high energy usage, as carryover of these flocs can pose significant challenges on downstream separation processes (e.g., turbidity breakthrough in filters, reduced filter runtimes, increased organic loading etc.). Recent work by Yu et al 13 suggests that broken flocs may not grow into large aggregates due to a net reduction in the number of active surface hydroxyl groups.…”

Section: Resultsmentioning

confidence: 99%

Influence of the Mixing Energy Consumption Affecting Coagulation and Floc Aggregation

Vadasarukkai

Gagnon

2017

Environ. Sci. Technol.

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The operational significance of energy-intensive rapid mixing processes remains unaddressed in coagulation and flocculation of insoluble precipitates (flocs), which play an important role in the removal of impurities from drinking water supplies. In this study, the influence of rapid mixing and associated mixing energy on floc aggregation was examined for a surface water source characterized by a high fraction of aquatic humic matter. Infrared spectral analyses showed that the colloidal complexes resulting from ligand exchange between iron and dissolved natural organic matter (DOM) were not substantially influenced by the mixing energy input. This signified that DOM removal by coagulation can be achieved at lower mixing intensity, thereby reducing energy consumption. In contrast, macroscopic investigations showed the coagulation mixing energy affected floc size distributions during the slow mixing stage in flocculation and, to some extent, their settling characteristics. The results from analysis of floc properties clearly showed that more mixing energy was expended than necessary in coagulation, which is typically designed at a high mixing intensity range of 600-1000 s in treatment plants. The key findings from this study have practical implications to water utilities to strategically meet water quality goals while reducing energy demands.

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Section: Resultsmentioning

confidence: 99%

Influence of the Mixing Energy Consumption Affecting Coagulation and Floc Aggregation

Vadasarukkai

Gagnon

2017

Environ. Sci. Technol.

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“…On the other hand, if the desirability value is low, it is inferred that it would be very difficult to meet the criteria without making many compromises. [40] . These characteristics give sludge an acceptable sedimentation rate and good compactness at the laboratory scale.…”

Section: -5graphical Analysismentioning

confidence: 99%

Electrochemical treatment of highly coloured textile wastewater: Optimization through experimental design

2021

JCBSC

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The main goal of this study was to treat highly coloured textile wastewater (HCTW) by electrocoagulation (EC) due to its environmental hazard. The experiments were carried out in batch mode using an electrolytic cell in which the electrodes are arranged in a parallel monopolar configuration. The results of HCTW's characterization showed that these wastewaters are poorly biodegradable (BOD5/ COD = 0.07) and have a relatively high organic load (COD = 1024.6 mg/L). Modelling of the treatment using a full factorial design (FFD) showed firstly that the three selected factors electrolysis time ( 1 ), current intensity ( 2 ) and electrode type ( 3 ) are statically significant. The increase in electrolysis time ( 1 ) and current intensity ( 2 ) has a positive effect on the removal of absorbance and COD. Moreover, iron electrodes have a better efficiency compared to aluminium electrodes. In addition, they promote increased mass loss. Secondly, the optimal conditions were determined from a composite central design (CCD). The criteria for multi-objective optimization of mathematical models were to maximize the removal of absorbance and COD while minimizing mass loss. The application of the predicted optimal Electrochemical … Sié Alain Hien et al.

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“…While the increasing of the current density from 30 to 40 mA/cm 2 was given an insignificant increase in the ions removal (from 95.5% to 96.2%), accordingly, 30 mA/cm 2 was selected as a best current density. The reason for this is due to the electrical energy consumption was concerning with the square rate of the current density (Lee & Gagnon 2016).…”

Section: Effect Of Current Densitymentioning

confidence: 99%

Removal of Hexavalent Chromium Ions From the Simulated Wastewater Using Electrocoagulation Process

Kamar¹,

Esgair²,

Abod³

et al. 2018

Simi 2018

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The removal of hexavalent chromium (Cr +6) ions from simulated wastewater was investigated by using batch electrocoagulation. The influence of several variables on the removal process was studied such as a type of electrodes, initial pH, initial concentration of Cr +6 ions, electrolysis time, sodium chloride concentration and current density. The experimental results showed that the removal efficiency of Cr +6 ions was more effective when using iron electrode comparing with the aluminium electrodes. The maximum removal of Cr +6 ions was 96.58% at pH 6.0, initial ion concentration 40 mg/L, electrolysis time 15 min, sodium chloride concentration 2 g/L, and the current density 30 mA/cm 2 .

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Growth and structure of flocs following electrocoagulation

Cited by 48 publications

References 29 publications

Influence of the Mixing Energy Consumption Affecting Coagulation and Floc Aggregation

Influence of the Mixing Energy Consumption Affecting Coagulation and Floc Aggregation

Electrochemical treatment of highly coloured textile wastewater: Optimization through experimental design

Removal of Hexavalent Chromium Ions From the Simulated Wastewater Using Electrocoagulation Process

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