Evaluation of a novel composite inorganic coagulant prepared by red mud for phosphate removal

Zhao, Ying; Zhang, Lieyu; Fan, Ni; Xi, Beidou; Xia, Xunfeng; Peng, Xianjia; Luan, Zhaokun

doi:10.1016/j.desal.2011.01.065

Cited by 66 publications

(30 citation statements)

References 31 publications

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“…The characteristics of the new coagulant are listed in Table 1. More information regarding this new coagulant can be found in Zhao et al [28].…”

Section: Methodsmentioning

confidence: 99%

Removal of phosphate from wastewater by using open gradient superconducting magnetic separation as pretreatment for high gradient superconducting magnetic separation

Zhao

et al. 2012

Separation and Purification Technology

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a b s t r a c tThe removal of phosphate from wastewater using a combination of open gradient superconducting magnetic separation (OGMS) and high gradient superconducting magnetic separation (HGMS) was investigated. The magnetic seeding material used was Fe 3 O 4 , and a novel composite inorganic coagulant was added to combine the phosphate with the magnetic seed. The important parameters that influenced the removal efficiency of phosphate in OGMS or HGMS, slow mixing time, magnetic seeding dosage, coagulant dosage, hydraulic retention time, magnetic field strength and flow rate, were systematically investigated. The performance of the OGMS-HGMS process was evaluated by treating synthetic phosphate wastewater. The results showed that all of the investigated parameters except for slow mixing time had a significant effect on phosphate removal. The phosphate concentration was reduced from 0.50 to 0.01 mg/L under the following optimal reaction conditions: coagulant dosage, 50 mg/L; Fe 3 O 4 , 100 mg/L; magnet working current, 160 A; hydraulic retention time in OGMS, 0.5 min; and flow rate in HGMS, 2 L/min. Overall, the use of OGMS as a pretreatment for HGMS was shown to be a good method of increasing phosphate removal efficiency while simultaneously increasing the flow rate of HGMS.

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“…The characteristics of the new coagulant are listed in Table 1. More information regarding this new coagulant can be found in Zhao et al [28].…”

Section: Methodsmentioning

confidence: 99%

Removal of phosphate from wastewater by using open gradient superconducting magnetic separation as pretreatment for high gradient superconducting magnetic separation

Zhao

et al. 2012

Separation and Purification Technology

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“…It is noteworthy that phosphorus removal is dependent on the choice of an appropriate adsorbent material. A variety of solid materials and minerals have been studied as adsorbents including slag (Xiong et al 2008;Kumar et al 2010;Drizo et al 2008), red mud (Bhatnagar et al 2011;Zhao et al 2011), Fe and Mn oxides (Zhang et al 2009) and oxyhydroxides (Namasivayam and Prathap 2005), and polymeric ligand exchangers (Biswas et al 2008). Currently, natural minerals are being investigated as inexpensive and abundant adsorbents for phosphorus removal from micro-polluted wastewater in rural area point sources.…”

Section: Introductionmentioning

confidence: 99%

Natural Volcanic Tephra for Phosphate Removal from Rural Micro-polluted Wastewater

Zhang

et al. 2014

Water Air Soil Pollut

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A kind of volcanic tephra (VT) as abundant natural mineral in China was studied for phosphate (P) removal from rural micro-polluted wastewater. Physical and chemical properties of VT were investigated by scanning electron microscopy (SEM), energy dispersive X-ray spectrometer (EDX), X-ray diffraction (XRD), UV-visible diffuse reflectance spectrometry, and Fourier transform infrared spectroscopy (FT-IR). The uptake of P decreased with the increase of the initial solution pH, and the optimum solution pH required for maximum P removal rate was 2.0. Zeta potential analyses were carried out to vividly describe the surface charges at different solution pH. The equilibrium data were both fitted well for Langmuir and Freundlich isotherm models. Thermodynamic parameters including changes in standard enthalpy (ΔH 0 ), standard entropy (ΔS 0 ), and standard Gibbs free energy (ΔG 0 ) were calculated. The removal of P was predominantly based on ionexchange process when the initial solution pH in the range of 2.0-6.0. A given dose of VT can be recycled for eight times. VT minerals were attempted for P removal from rural micro-polluted wastewater collected in Shanghai, China containing 50 mg L −1 P, and the removal rate was determined to be nearly 100 % with the capacity of 0.5 mg P/g VT minerals. All our results indicated that VT could be a promising choice for P removal from micro-polluted wastewater in rural area with the distinct advantages of being low cost and environmentally benign.

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“…In this scenario, the need of implementing new and cheaper water treatment technologies has arisen in order to keep the aquatic environment clean and safe from pollution concerns [1]. Due to their relevance and importance in industrial processes, two main groups of colloidal pollutants are considered in this investigation: -Industrial pollution involving dyes.…”

Section: Introductionmentioning

confidence: 99%

Optimum Coagulant from Acacia mearnsii de Wild for Wastewater Treatment

2011

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A novel coagulant agent from Acacia mearnsii de Wild tannin extract was characterized for removal of the anthraquinonic colorant Alizarin Violet 3R and the anionic surfactant sodium dodecylbenzene sulfonate. This coagulant is the result of a previous optimization study. The influence of operative variables such as temperature, coagulant dosage, initial pollutant content, and pH was investigated. The new coagulant demonstrates a high affinity for dye and surfactant and is efficient within a wide range of working conditions. While the temperature does not affect the coagulant ability, an acidic pH seems to increase the contaminant removal from aqueous solutions. Implementation in a pilot plant confirms the feasibility of this coagulant not only at lab scale, but also at higher level.

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Evaluation of a novel composite inorganic coagulant prepared by red mud for phosphate removal

Cited by 66 publications

References 31 publications

Removal of phosphate from wastewater by using open gradient superconducting magnetic separation as pretreatment for high gradient superconducting magnetic separation

Removal of phosphate from wastewater by using open gradient superconducting magnetic separation as pretreatment for high gradient superconducting magnetic separation

Natural Volcanic Tephra for Phosphate Removal from Rural Micro-polluted Wastewater

Optimum Coagulant from Acacia mearnsii de Wild for Wastewater Treatment

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