Effect of silicon dose on preparation and coagulation performance of poly-ferric-aluminum-silicate-sulfate from oil shale ash

Sun, Tong; Liu, Lianli; Wan, Lili; Zhang, Yanping

doi:10.1016/j.cej.2010.07.037

Cited by 59 publications

(43 citation statements)

References 25 publications

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“…The XRD at 2θ = 11.4º, 18.2º, 23.8º is the characteristic peak of Al 2 SO 4 (OH) 4 ·7H 2 O, which is absent in PFS. The results demonstrated that some polymerization and conformation have appeared to synthesize complex compounds of Fe, Al, Si, and other ions, rather than a simple mixture of the raw materials [18]. Compared with four diffractions, PFS, PFASS-0.0, PFASS-0.4 presented numbers of single, sharp, intense, and well-recognizable peaks, which were the crystalline structure of product, and in these products, very little evident amorphous phase can be recognized.…”

Section: Xrd Analysismentioning

confidence: 92%

“…However, some unavoidable limitations of traditional mono-Al or mono-Fe salts have raised great concerns such as, the residual aluminum of treated water by Al-coagulant may pose a threat to human health and the environment, while serious chroma and strong corrosive may be caused by Fecoagulant. Therefore, a complex coagulant composed of iron and aluminum components in proper Al/Fe molar ratio is ideal, as it possesses the advantages of coagulants instead of their disadvantages [18]. Furthermore, the complex coagulant can reduce the effluent concentration of aluminum effectively.…”

Section: Effect Of Al/ Fe On Coagulation Performancementioning

confidence: 99%

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Characterization and coagulation–flocculation performance of a composite coagulant: poly-ferric-aluminum-silicate-sulfate

Chen

Zheng

Zhai

et al. 2015

Desalination and Water Treatment

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2014): Characterization and coagulation-flocculation performance of a composite coagulant: poly-ferric-aluminum-silicatesulfate, Desalination and Water TreatmentTo link to this article: http://dx. A B S T R A C TComposite coagulant has received widespread attention and research for its excellent coagulation performance in recent years. In this study, a new composite coagulant poly-ferric-aluminum-silicate-sulfate was synthesized using water glass, FeSO 4 ·7H 2 O, Al 2 (SO 4 ) 3 ·18H 2 O, and NaClO 3 , their structures and morphologies were characterized and compared by X-ray diffraction, infrared spectra, and scanning electron microscopy. In addition, to obtain the optimum synthetic conditions resulting in the maximum turbidity removal efficiency, single-factor method was used to examine the parameters such as Si/[Al+Fe], Al/Fe, and aging time by municipal wastewater treatment. The coagulation-flocculation process showed that chemical oxygen demand and turbidity removal efficiency could achieve 77 and 99.4%, respectively, when the optimum synthesis conditions were Si/[Al+Fe], Al/Fe, OH/[Al+Fe], aging time, and reaction temperature of 0.4:1, 3:7, 0.3, 24 h, and 80˚C, respectively. In addition, when the Si/[Al+Fe] of coagulant was 0.2 and 0.4, the coagulant produced lower sludge volume. The result showed that PFASS exhibit superior flocculation effect, and the main mechanisms in reducing the surface charge of colloids are neutralization and adsorption/bridging coagulation-flocculation.

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Section: Xrd Analysismentioning

confidence: 92%

Section: Effect Of Al/ Fe On Coagulation Performancementioning

confidence: 99%

Characterization and coagulation–flocculation performance of a composite coagulant: poly-ferric-aluminum-silicate-sulfate

Chen

Zheng

Zhai

et al. 2015

Desalination and Water Treatment

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“…The polyferric silicate sulphate coagulants prepared by co-polymerization had a higher coagulation efficiency than those prepared by compositepolymerization [12]. Therefore, preparation of polysilicate complex coagulants by co-polymerization is more popular [3,9,10]. Nevertheless, there is little research on the synchronous-polymerization method, which synchronizes the polymerization of silicate and the hydroxylation of metal salts [8], and even less research on comparison of this method with conventional methods.…”

Section: Introductionmentioning

confidence: 93%

“…These coagulants are often prepared from industrial-grade materials so some literatures focus on utilization of cheap industrial wastes. However, their preparation methods are complex as most materials need to be calcined, then leached at high temperature for long time and polymerized under heating [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of poly-silicic-cation coagulants by synchronous-polymerization and co-polymerization

2013

Chemical Engineering Journal

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“…The preparation of Fe-based composite coagulants could be achieved by combining other additive compounds with PFS, thereby effectively combining the properties of both components (Fu et al 2009;Lan et al 2009). Sun et al prepared polyferric aluminum-silicate sulfate (PFASS) with various (Al + Fe)/Si, and revealed that the optimal (Al + Fe)/Si molar ratios for turbidity and COD removal differ at 12:1 and 16:1, respectively (Sun et al 2010). Zhu et al synthesized the composite coagulant polymeric aluminum ferric sulfate (PAFS), the result demonstrated the addition of Al 3+ as modifier into polyferric sulfate have enhanced the COD and turbidity removal efficiency successfully (Zhu et al 2011).…”

mentioning

confidence: 98%

Preparation and Characterization of a Composite Coagulant: Polyferric Titanium Sulfate

Chen

Zheng

Guo

et al. 2016

Water Air Soil Pollut

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In this study, a novel composite coagulant polyferric titanium sulfate (PFTS) was synthesized and the kaolin-fulvic acid simulated water was employed to verify the coagulation efficiency. To obtain the optimal conditions for preparing the composite coagulant, the parameters affecting the coagulation performance such as Ti/Fe, P/Fe, OH/Fe, and oxidizer dosage were evaluated by single factor experiments and response surface methodology. The structure and morphology of PFTS were investigated by some conventional methods and those affecting coagulation-flocculation behaviors such as coagulant dosage, water sample initial pH, were also examined. Flocs properties of PFTS were investigated by Mastersizer 2000. The results indicated that PFTS presented a porous and a compacted gel network structure, in which some major phase structure and chemical bonds were discovered. The jar tests demonstrated the superior coagulation performance at coagulant dosage of 20-30 mg/L and the optimum pH range of 7-8. The optimum synthetic conditions were Ti/Fe, P/Fe, OH/Fe molar ratio and oxidant adding speed of 0.13, 0.25, 0.29, and 4 mL/min, respectively. Under the optimal condition, the residual turbidity, (Dissolved organic matter) DOC removal and residual iron of 0.82, 53 %, and 0.08 mg/L, respectively, could be acquired by PFTS. The flocs analysis results manifested that the dominant mechanism in flocs growth is absorption-bridging and sweeping coagulation, while charge neutralization mechanisms is the primary in the formation of compact flocs.

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Effect of silicon dose on preparation and coagulation performance of poly-ferric-aluminum-silicate-sulfate from oil shale ash

Cited by 59 publications

References 25 publications

Characterization and coagulation–flocculation performance of a composite coagulant: poly-ferric-aluminum-silicate-sulfate

Characterization and coagulation–flocculation performance of a composite coagulant: poly-ferric-aluminum-silicate-sulfate

Preparation and characterization of poly-silicic-cation coagulants by synchronous-polymerization and co-polymerization

Preparation and Characterization of a Composite Coagulant: Polyferric Titanium Sulfate

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