Application of cerium and lanthanum coagulants in wastewater treatment—A comparative assessment to magnesium, aluminum, and iron coagulants

Kajjumba, George William; Fischer, Daniel A.; Risso, LeAnna; Koury, Daniel; Marti, Erica J.

doi:10.1016/j.cej.2021.131268

Cited by 20 publications

(12 citation statements)

References 35 publications

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“…Many absorption peaks existed at 950–1300 cm –1 , which should be the absorption peak of SO 4 2– . , There were two strong absorption peaks with the peak of Fe–OH–Fe at 1100 cm –1 and the peak of Al–OH–Al at 1150 cm –1 , respectively . The positions of the two peaks were similar and belonged to the bending vibration of Me–OH on the molecular surface . It shows that both hydroxyl-linked polymeric iron and hydroxyl-bridged polymeric aluminum existed in PAFS.…”

Section: Resultsmentioning

confidence: 85%

“…42 The positions of the two peaks were similar and belonged to the bending vibration of Me− OH on the molecular surface. 43 It indicates that the hydrolysis of Fe 3+ was carried out at a low basicity, while the hydrolysis degree of Al 3+ was low at the same condition. 44 The result of SEM shows that the samples of PAFS generally existed as a formless material.…”

Section: Structure and Characterization Of Polymersmentioning

confidence: 93%

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Preparation and Application of Polyaluminum Ferric Sulfate from Red Mud: Behaviors of Leaching, Polymerizing, and Coagulation

Li,

Zhang,

Zhu

2024

ACS Omega

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Red mud is a solid waste containing valuable components, such as aluminum and iron. This paper aims to recover aluminum and iron from red mud by acid leaching and prepare polyaluminum ferric sulfate (PAFS) to apply for the turbidity reduction treatment of coal slurry water. The behaviors of leaching, polymerizing, and coagulation were analyzed by leaching thermodynamics and advanced micro-detection methods. More than 90% of aluminum and 60% of iron in red mud were dissolved into the leaching solution by using 50% sulfuric acid (v/v) with 7 mL/g at 100 °C for 2 h, where the crystal lattice of cancrinite was significantly destroyed to promote the dissolution of aluminum. The low polymerization (Al + Fe) a , medium polymerization (Al + Fe) b , and high polymerization (Al + Fe) c could be generated in PAFS by adjusting the basicity of the leaching solution with 0.7−0.9. The removal efficiency of turbidity of wastewater could reach more than 95% by using PAFS at 25 mg/L in the pH range of 6.0−7.0. The turbidity reduction mechanism included not only the electric neutralization of (Al + Fe) a but also the adsorption of (Al + Fe) b and the entrapment effect of (Al + Fe) c . This current study contributes to the future development of red mud based on flocculants containing aluminum and iron for wastewater treatment.

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Section: Resultsmentioning

confidence: 85%

Section: Structure and Characterization Of Polymersmentioning

confidence: 93%

Preparation and Application of Polyaluminum Ferric Sulfate from Red Mud: Behaviors of Leaching, Polymerizing, and Coagulation

Li,

Zhang,

Zhu

2024

ACS Omega

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“…It is also important to consider the impact of different types of coagulants on overall operating costs, including pipeline maintenance and downstream water treatment. Kajjumba et al (2021) found that Mg (OH) 2 was the cheapest coagulant, but struvite formed in pipes increased the overall operating costs; FeCl 3 , alum and Na 2 Al 2 O 4 were slightly more expensive than Mg (OH) 2 , but higher sludge yields roughly doubled the total cost; lanthanides, although high in unit price, had low sludge yields. Therefore, the use of coagulants depends firstly on their effectiveness and secondly on their operating costs relative to alternative compounds.…”

Section: Practical Application Of Coagulation For Cyanobacteria Controlmentioning

confidence: 99%

Coagulation as an effective method for cyanobacterial bloom control: A review

Yang,

Wang,

et al. 2024

Water Environment Research

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Eutrophication, the over‐enrichment with nutrients, for example, nitrogen and phosphorus, of ponds, reservoirs and lakes, is an urgent water quality issue. The most notorious symptom of eutrophication is a massive proliferation of cyanobacteria, which cause aquatic organism death, impair ecosystem and harm human health. The method considered to be most effective to counteract eutrophication is to reduce external nutrient inputs. However, merely controlling external nutrient load is insufficient to mitigate eutrophication. Consequently, a rapid diminishing of cyanobacterial blooms is relied on in‐lake intervention, which may encompass a great variety of different approaches. Coagulation/flocculation is the most used and important water purification unit. Since cyanobacterial cells generally carry negative charges, coagulants are added to water to neutralize the negative charges on the surface of cyanobacteria, causing them to destabilize and precipitate. Most of cyanobacteria and their metabolites can be removed simultaneously. However, when cyanobacterial density is high, sticky secretions distribute outside cells because of the small size of cyanobacteria. The sticky secretions are easily to form complex colloids with coagulants, making it difficult for cyanobacteria to destabilize and resulting in unsatisfactory treatment effects of coagulation on cyanobacteria. Therefore, various coagulants and coagulation methods were developed. In this paper, the focus is on the coagulation of cyanobacteria as a promising tool to manage eutrophication. Basic principles, applications, pros and cons of chemical, physical and biological coagulation are reviewed. In addition, the application of coagulation in water treatment is discussed. It is the aim of this review article to provide a significant reference for large‐scale governance of cyanobacterial blooms.Practitioner Points Flocculation was a promising tool for controlling cyanobacteria blooms. Basic principles of four kinds of flocculation methods were elucidated. Flocculant was important in the flocculation process.

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“…Zhou et al employed polyaluminum chloride (PAC) and ferric chloride (FeCl 3 ) as coagulants and successfully achieved effective degradation of polystyrene (PS) and polyethylene (PE) . Nevertheless, the utilization of coagulants is expensive, and eliminating relatively large MPs is challenging . Electrocoagulation is an innovative method for MPs degradation based on electrochemical technology, which does not require chemicals from chemical coagulation reactions or microorganisms from activated sludge processes .…”

Section: Current Technologies For Mps Conversionmentioning

confidence: 99%

Photocatalysis toward Microplastics Conversion: A Critical Review

Zhou,

Xu,

Song

et al. 2024

ACS Catal.

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Microplastics (MPs, particle size < 5 mm) have become increasingly ubiquitous on Earth due to the cleavage and degradation of the heavy use of plastics. MPs have recently been reported to be detected in human blood, alveoli, breast milk, embryos, and other organs, raising concerns about their environmental risks. Photocatalysis has been identified as a potential means for MPs conversion, which utilizes solar energy to stimulate a semiconductor photocatalyst. However, the study of photocatalytic conversion of MPs is still in the incubation period. This review overviews the current state-of-the-art technologies for MPs conversion. Then, the fundamental principles, challenges, analytical techniques, and evaluation indexes of photocatalytic MPs reforming are highlighted. We have systematically summarized the recent advances in the photocatalytic conversion of MPs and identified the key factors influencing photocatalytic performance. Finally, we propose some perspectives for developing efficient photocatalytic systems for reforming MPs. This review will provide a guideline for developing and applying photocatalytic technology for reforming MPs, which will significantly contribute to developing this emerging research field.

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Application of cerium and lanthanum coagulants in wastewater treatment—A comparative assessment to magnesium, aluminum, and iron coagulants

Cited by 20 publications

References 35 publications

Preparation and Application of Polyaluminum Ferric Sulfate from Red Mud: Behaviors of Leaching, Polymerizing, and Coagulation

Preparation and Application of Polyaluminum Ferric Sulfate from Red Mud: Behaviors of Leaching, Polymerizing, and Coagulation

Coagulation as an effective method for cyanobacterial bloom control: A review

Photocatalysis toward Microplastics Conversion: A Critical Review

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