Preparation of a composite coagulant: Polymeric aluminum ferric sulfate (PAFS) for wastewater treatment

Zhu, Guocheng; Zheng, Huaili; Chen, Wenyuan; Wang, Fan; Zhang, Peng; Tshukudu, Tiroyaone

doi:10.1016/j.desal.2011.10.019

Cited by 96 publications

(45 citation statements)

References 22 publications

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“…Water/wastewater usually remains stable and cannot be purified by itself for charge repulsion, which is caused by the presence of micro-colloidal or suspended particles in water. The chemical coagulation-flocculation can remove the micro-colloidal or suspended particles effectively by the process of adsorption-charge neutralization, adsorption-bridge, sweep flocculation [4,5]. The coagulants can usually be divided into inorganic, organic, and composite coagulants.…”

Section: Introductionmentioning

confidence: 99%

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

Chen

Zheng

Zhai

et al. 2014

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: Introductionmentioning

confidence: 99%

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

Chen

Zheng

Zhai

et al. 2014

Desalination and Water Treatment

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“…The high dosages of the organic polymer could also give rise to chain bridging and adsorption mechanism [11]. In general, charge neutralization, sweep flocculation and polymer adsorption played a predominant role in the coagulation-flocculation process due to its pH and dosing values.…”

Section: Response Surface Plotting For Evaluation Of Operational Paramentioning

confidence: 99%

“…Lastly, biological treatment techniques used are aerobic degradation, anaerobic degradation, and living/dead microbial biomass [6]. Coagulation-flocculation is an already established process for contaminant removal from most wastewaters ranging from wastewater containing: biochemical oxygen demand; BOD [7], colour [8], dissolved organic carbon; DOC [9], turbidity [10], chemical oxygen demand; COD [11], grease and oil [12], total suspended solids; TSS [7], heavy metals [13][14]. Coagulation-flocculation is an efficient unit process used for colour removal from industrial wastewater due to its efficiency and simplicity to operate [12].…”

Section: Introductionmentioning

confidence: 99%

Optimization of coagulation-flocculation process for colour removal from Azo dye using natural polymers: response surface methodological approach

Obiora-Okafo¹,

Onukwuli²

2017

Nig. J. Tech.

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The ability of organic polymer rich coagulants for colour removal from acid dye was studied. An improved method for the extraction of the active coagulant agent from the seeds was employed. The effects of four variables including pH, coagulant dosage, dye concentration and time were analyzed. Response surface methodology (RSM) using face-centered central composite design (FCCD) was used to optimize the four variables. Increase in the colour removal efficiency was higher in acidic solution pH. Accurate control of coagulant dosages gave optimum destabilization of charged particles and re-stabilization occurred at above 800mg/L dosages. Polymer performances were measured through time-dependent decrease in particle concentrations following aggregates growth. The verification experiment agreed with the predicted values having less than 4% standard error. Overlay contour plot was used to establish an optimum condition for the multiple responses studied. The response surface approach was appropriate for optimizing the coagulation-flocculation process while minimizing the number of experiments. Coagulants studied should be considered as an alternative for conventional coagulants that are widely used in dye wastewater treatment plants.

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“…The adding ratio of each flocculant was consistent with the amount used in industrial applications (Jin and Miao 2006;Mozia 2010;Zhu et al 2012). After mixing the sludge intensely with flocculants, dewatering proceeded down to a moisture content of 45~50 % by filter press.…”

Section: Experimental Materialsmentioning

confidence: 97%

Influence of organic and inorganic flocculants on the formation of PCDD/Fs during sewage sludge incineration

Lin

et al. 2014

Environ Sci Pollut Res

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Flocculants are widely used to improve the properties of sludge dewatering in industrial wastewater treatment. However, there have been no studies conducted on the influence of flocculants on the formation of polychlorinated dibenzo-p-dioxin and dibenzofurans (PCDD/Fs) during sewage sludge incineration. This paper selected three typical kinds of flocculants, including polyacrylamide (PAM), poly-ferric chloride (PFC), and polyaluminum chloride (PAC) flocculant, to study their influences on the formation of PCDD/Fs during sewage sludge incineration. The results indicated that PAM flocculant, which is an organic flocculant, inhibited the formation of PCDD/Fs in sewage sludge incineration, while inorganic flocculant, such as PFC and PAC flocculant, promoted the formation. The most probable explanation is that the amino content in the PAM flocculant acted as an inhibitor in the formation of PCDD/Fs, while the chlorine content, especially the metal catalyst in the PFC and PAC flocculants, increased the formation rate. The addition of flocculants nearly did not change the distribution of PCDD/F homologues. The PCDFs contributed the most toxic equivalent (TEQ) value, especially 2, 3, 4, 7, 8-PeCDF. Therefore, the use of inorganic flocculants in industrial wastewater treatment should be further assessed and possibly needs to be strictly regulated if the sludge is incinerated. From this aspect, a priority to the use of organic flocculants should be given.

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Preparation of a composite coagulant: Polymeric aluminum ferric sulfate (PAFS) for wastewater treatment

Cited by 96 publications

References 22 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

Optimization of coagulation-flocculation process for colour removal from Azo dye using natural polymers: response surface methodological approach

Influence of organic and inorganic flocculants on the formation of PCDD/Fs during sewage sludge incineration

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