Potential of titanium coagulants for water and wastewater treatment: Current status and future perspectives

Gan, Yonghai; Li, Jingbiao; Zhang, Li; Wu, Biao; Huang, Wenguang; Li, Haojie; Zhang, Shujuan

doi:10.1016/j.cej.2020.126837

Cited by 76 publications

(17 citation statements)

References 109 publications

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“…Nevertheless, after such a treatment, the salinity of the discharged water was increased to 7500 mg/L, which was higher than the discharge limit (<4800 mg/L). 29 The above results demonstrate that TXC was a better coagulant than PAC for the treatment of Sb-containing wastewater. The better performance of TXC in the pilotscale test for Sb removal come from the following characteristics:…”

Section: ■ Results and Discussionmentioning

confidence: 69%

“…Currently, the main obstacles for the mass production of TXC is the source of raw materials. As analyzed in a review article, 29 the cost from raw materials might be compensated by the profit of TiO 2 recovery from the sludge. Besides, the simplified removal procedure of Sb in the one-step coagulation and the alleviated membrane fouling brought by TXC coagulation could also save a large fraction of treatment cost for water reuse.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…In recent years, titanium (Ti)-based coagulation has shown a great promise in removal of oxysalts (e.g., chromate, arsenate, and arsenite). − As compared with Fe and Al-based coagulation, Ti-based coagulation has the following advantages: wider applicable pH and dose range, − low residual turbidity (<1 NTU), and low residual metal concentrations. − The above merits make Ti coagulation a promising pretreatment step for membrane filtration. ,, …”

Section: Introductionmentioning

confidence: 99%

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Titanium Coagulation Simplified Removal Procedure and Alleviated Membrane Fouling in Treatment of Antimony-Containing Wastewater

Gan

et al. 2021

ACS EST Eng.

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The removal of antimony (Sb) from textile and dyeing wastewater is a challenging task. To meet the discharge limit and the demand for water reuse, the currently available treatment process was complicated: first, coagulation with polyaluminum chloride (PAC) and polyacrylamide (PAM) prior to membrane filtration to remove turbidity and then coagulation with polyferric sulfate (PFS) after membrane filtration to remove Sb from the concentrate. Such a process is troublesome in operation and generates a large amount of hazardous sludge. Here, we report that using a titanium xerogel coagulant (TXC) prior to membrane filtration could simultaneously remove the turbidity and the residual Sb in one-step. With TXC as the coagulants, no after-membrane coagulation was needed. Moreover, the TXC coagulation significantly alleviated the membrane fouling. A 24-day running of a pilot-scale test demonstrates that addition of 60 mg/L of TXC reduced the residual Sb concentration in the effluent from 226–894 μg/L to below the discharge limit (<50 μg/L). Meanwhile, the operating time of the ultrafiltration (UF)–reverse osmosis (RO) membrane system was prolonged, because of alleviated membrane fouling. This work indicates that TXC coagulation is a promising strategy for the treatment of Sb-containing wastewater. The simplified treatment procedure and the alleviated membrane fouling are helpful in reducing the processing costs for water reuse.

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Section: ■ Results and Discussionmentioning

confidence: 69%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Titanium Coagulation Simplified Removal Procedure and Alleviated Membrane Fouling in Treatment of Antimony-Containing Wastewater

Gan

et al. 2021

ACS EST Eng.

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“…Recently, more and more information about the high prospects of using titanium salts in wastewater treatment processes of various origins has been encountered [6,7]. Unfortunately, these reagents are used in the form of pure compounds, which negatively affects the cost of the process.…”

Section: Introductionmentioning

confidence: 99%

Complex Titanium-Containing Reagents in the Processes of Waste Water Treatment in the Metallurgical Industry

Кузин

Kruchinina

Nosova

2021

METAL 2021 Conference Proeedings

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“…; 当柠檬酸与Fe 2 (SO 4 ) 3 的摩尔比为 0.05时, 铁盐混凝过程无絮体生成 [11] [6,7,12~19] , 借助Matlab软件(R2019a, MathWorks公司, 美国)求解非齐次线性方程组得到不同形态金属物种的含量随pH变化的分布曲线 [4] . 在氢氧化物沉淀溶解平衡的分析过程中, 根据水解平衡常数和溶度积常数…”

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Analysis of key factors in the coagulation of metal salts based on the calculation of hydrolysis-precipitation distribution

Gan¹,

Zhang²,

Wu³

et al. 2021

Sci. Sin.-Chim

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Hydrolysis and precipitation are the key processes that determine the coagulation performance of inorganic metal salts. The valence and concentration of metal salts, ligands, and solution pH all influence the coagulation performance. In order to get a full picture on the pros and cons of various inorganic metal salts as coagulants, this paper conducted thermodynamic equilibrium calculations and coagulation experiments to analyze and verify the hydrolysisprecipitation areas and speciation of four inorganic metal salts (aluminum, iron, titanium, and zirconium) in the absence and presence of ligands. In addition, the contributions of polynuclear hydrolysates in the hydrolysis and precipitation of the four metal ions were quantitatively described. Furthermore, the underlying mechanisms of the effects of common aquatic ligands on coagulation performance were discussed from the perspective of solution chemistry. The above results provide a theoretical basis for the development and application of inorganic metal salt coagulants, and are of great significance for understanding the coagulation performance and mechanisms accurately.

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Potential of titanium coagulants for water and wastewater treatment: Current status and future perspectives

Cited by 76 publications

References 109 publications

Titanium Coagulation Simplified Removal Procedure and Alleviated Membrane Fouling in Treatment of Antimony-Containing Wastewater

Titanium Coagulation Simplified Removal Procedure and Alleviated Membrane Fouling in Treatment of Antimony-Containing Wastewater

Complex Titanium-Containing Reagents in the Processes of Waste Water Treatment in the Metallurgical Industry

Analysis of key factors in the coagulation of metal salts based on the calculation of hydrolysis-precipitation distribution

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