Effect of basicity and sodium ions on stability of polymeric ferric sulfate as coagulants

Jia, Dingtian; Li, Mingyu; Liu, Guoqiang; Wu, Penghui; Yang, Jing; Li, Yi-Chun; Shao-fen, Zhong; Xu, Wenjie

doi:10.1016/j.colsurfa.2016.10.021

Cited by 27 publications

(3 citation statements)

References 22 publications

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“…The analysis of this XRD pattern shows that the peaks at 23.30°, 29.38°, and 31.46° are characteristic of FeFe 4 (SO 4 ) 6 (OH) 2 ·20H 2 O. The peaks at 27.52°, 31.56°, and 45.52° represent Fe 3 SO 4 (OH) 2 ·2H 2 O, 22 both of which are hydroxyl‐bridge‐linked iron aggregates. In contrast, the unsimulated light system had hydroxyl‐bridged iron aggregates FeFe 4 (SO 4 ) 6 (OH) 2 ·20H 2 O (23.30°, 29.38°, 31.46°) and common iron salt Fe 2 (SO 4 ) 3 ·11H 2 O (27.46°, 29.83°, 31.60°).…”

Section: Resultsmentioning

confidence: 96%

Oilfield wastewater treatment in anode and sunlight/persulfate composite oxidation system

Wang

Zhang

et al. 2022

Env Prog and Sustain Energy

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A method is proposed that encompasses visible light/anodic oxidation-derived persulfates as well as the formation of a novel polyferric flocculation agent, which can synergistically treat oilfield wastewater. In this method, under irradiation of visible light, the anodic oxidation online generated sulfate is partly converted into sulfate radicals for oxidation of organic pollutants. It partly oxidizes divalent iron ions added at the end of electrolysis into polyferric species that can flocculate and degrade organic pollutants in the wastewater. The advantages of this process are environmental safety and overall low cost. Under optimal conditions (pH = 7.0, electrolysis time of 50 min, applied current intensity of 1.2 A, [Na 2 SO 4 ] = 0.8 mol/L), the system exposed to simulated sunlight achieved 73.3% TOC removal, showing high efficiency in degrading organic pollutants. The experiment proved that the Na 2 SO 4 in the electrolyte can be partially recovered.

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Section: Resultsmentioning

confidence: 96%

Oilfield wastewater treatment in anode and sunlight/persulfate composite oxidation system

Wang

Zhang

et al. 2022

Env Prog and Sustain Energy

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“…The peaks at 609 and 670 cm À1 bands are caused by the bending Figure 7 shows the XRD spectra of the flocs from both processes, and the analysis of this XRD shows that the flocs from both processes have characteristic peaks of 27.52°, 31.56°, and 45.52°. These peaks represent Fe 3 SO 4 (OH) 2 •2H 2 O (Jia et al 2017), which is a hydroxyl-bridge-linked iron aggregate. According to the above analysis, the mixing process used in this study did not destroy the chemical structure of the flocs.…”

Section: Analysis Of Flocsmentioning

confidence: 99%

Vortex coagulation treatment of oilfield wastewater

Wang

Zhang

2022

Water Science and Technology

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In this study, the traditional coagulation process was optimized and a method of vortex coagulation for wastewater treatment was proposed for the first time. The process discards the sedimentation method used in traditional coagulation and uses agitation to bring flocs up. These flocs can then be stuck by the filter cotton fixed in wastewater, and the filter cotton and flocs can act as net capturing several times under the action of agitation. It is worth noting that the filter cotton and flocs can synergistically adsorb the suspended and organic pollutants from wastewater. The results showed that the chemical oxygen demand (COD) removal of vortex coagulation could reach 82%, which was 10% higher than that of the traditional coagulation under the same coagulant dosing. In addition, the flocs in conventional coagulation and vortex coagulation were analyzed by IR spectroscopy and XRD, which showed that the mixing process did not destroy the chemical structure of the flocs. Compared with the conventional method, this process does not require a sedimentation tank, which can avoid the investment of equipment construction in this area. The effects of coagulant dosage, pH, stirring speed, and stirring time on the wastewater treatment effects were explored in the experiment.

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“…ese production methods are under harsh production conditions, long period, high cost, and oxidant residue resulting in serious corrosion on the dosing system [8]. In order to overcome these shortcomings, biotechnology was introduced into the preparation of PFS.…”

Section: Introductionmentioning

confidence: 99%

Immobilized Microbial Catalytic Oxidation Preparation and Application of Biopolymeric Ferric Sulfate

Lü

Liu

et al. 2019

Journal of Chemistry

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A novel inorganic polymer flocculant, biopolymeric ferric sulfate (BPFS), was prepared by immobilization technology of microorganisms and by oxidation of ferrous sulfate using domestic Thiobacillus ferrooxidans (T. f) under acidic condition. T. f was isolated on the agarose single-plate medium, which exhibited an unusual trait on the utilization of low concentration of the nitrogen source and phosphorus as the nutrient substance. Under the optimal conditions, the microorganism could grow and reproduce normally and maintain the strong catalytic oxidation activity to Fe2+. The immobilization of T. f on the polyurethane as the support matrix was investigated. Cycling batch operation was applied to the preparation of 40 kg/m3, 60 kg/m3, and 80 kg/m3 BPFS when the optimal conditions are pH value of 1.8, circulation flow rate of 0.28–0.30 L/h, and reaction temperature of 28 ± 1°C. When the prepared BPFS and SPFS (solid biopolymeric ferric sulfate) were used to dispose Songhua River water, the removal rate of turbidity and CODMn of BPFS was slightly better than that of SPFS. The removal efficiencies of turbidity and CODMn by BPFS could reach 93.9% and 79.7%, respectively. The result suggests that the BPFS has good flocculating activity.

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Effect of basicity and sodium ions on stability of polymeric ferric sulfate as coagulants

Cited by 27 publications

References 22 publications

Oilfield wastewater treatment in anode and sunlight/persulfate composite oxidation system

Oilfield wastewater treatment in anode and sunlight/persulfate composite oxidation system

Vortex coagulation treatment of oilfield wastewater

Immobilized Microbial Catalytic Oxidation Preparation and Application of Biopolymeric Ferric Sulfate

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