A novel conversion of the groundwater treatment sludge to magnetic particles for the adsorption of methylene blue

Zhu, Suiyi; Fang, Shuai; Huo, Mingxin; Yu, Yang; Chen, Yu; Xia, Yang; Geng, Zhi; Wang, Yi; Bian, Dejun; Huo, Hongliang

doi:10.1016/j.jhazmat.2015.03.028

Cited by 74 publications

(47 citation statements)

References 35 publications

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“…The GWTS resulting from the process of iron removal from groundwater contains particles of iron oxyhydroxides with an average diameter of 100 nm [12]. The sludge particles have an irregular shape and size and form aggregates of a few micrometers in size.…”

Section: Introductionmentioning

confidence: 99%

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The properties of sludge formed as a result of coagulation of backwash water from filters removing iron and manganese from groundwater

et al. 2019

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The standard groundwater treatment technology is a simple, non-chemical reagent technology based on aeration and filtration processes. This treatment technology is resulted in the formation of groundwater treatment sludge (GWTS). Because one of the elements of sustainable development is the possibility of their reuse, that water treatment plant operators are looking for new ways of managing these sludges. At present, not all factors determining the adsorptive capacity of water treatment sludge are known. The explanation why the adsorption capacity of sludge with a similar structure and chemical composition may differ significantly will allow for their wider use as adsorbents. The information which must be known to ensure proper sludge management are the quality, chemical composition and texture characteristics of the GWTS. The sludges were characterized by X-ray diffraction, X-ray fluorescence, Fourier transform infrared spectroscopy and N 2 adsorption/desorption isotherms. The results showed that the composition and properties of the GWTS depend primarily on the quality parameters of the raw water and the processes and reagents used in its treatment technology. GWTS contains mainly amorphous iron oxides. Sludges are characterized by a large specific surface area (145 m 2 /g). Due to composition and textural parameters, GWTS demonstrates good adsorption properties toward different compounds such as heavy metals and metalloids. In this article, the authors describe the relationship between properties of resulting sludge and the properties of groundwater, the treatment technology and backwash water treatment from rapid filters.

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Section: Introductionmentioning

confidence: 99%

“…The resulting sludge consists mainly of poorly crystalline oxyhydroxides (mainly ferrihydrite) and manganese oxides [13,14]. Silica has also been found up to 42% [12]. In sludge formed from groundwater treatment, the organic matter content is usually very low.…”

Section: Introductionmentioning

confidence: 99%

The properties of sludge formed as a result of coagulation of backwash water from filters removing iron and manganese from groundwater

et al. 2019

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“…However, high temperatures were applied in these methods to promote the breakdown of the Fe-O-Si or Fe-O-Al bonds into the form of Fe-O-Fe linkage [16]. The breakdown of Fe-O-Si or Fe-O-Al bonds can be achieved at low temperature [17]. For instance, by adding iron powder, red mud could be converted to magnetite-containing materials after hydrothermal treatment at 260 • C [18].…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Conversion of Red Mud into Magnetic Adsorbent for Effective Adsorption of Zn(II) in Water

et al. 2019

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Red mud, a Fe-rich waste generated from the aluminum industry, was recovered as an adsorbent for wastewater treatment. The separation process of red mud from water after adsorption, including centrifugation and filtration, was complicated. This study demonstrated an alternative option to recycle red mud for preparing magnetic adsorbent via a facile hydrothermal route using ascorbic acid as reductant. Red mud is weakly magnetized and consists of andradite, muscovite, hematite, and cancrinite. After hydrothermal treatment, andradite in red mud was reductively dissolved by ascorbic acid, and transformed into magnetite and morimotoite. With increasing hydrothermal temperature, the dissolution of andradite accelerated, and the crystallite size of magnetite increased. When the hydrothermal temperature reached 200 °C, the prepared adsorbent P-200 showed a desirable saturation magnetization of 4.1 Am2/kg, and could be easily magnetically separated from water after adsorption. The maximum adsorption capacity of P-200 for Zn2+ was 89.6 mg/g, which is eight-fold higher than that of the raw red mud. The adsorption of Zn2+ by P-200 fitted the Langmuir model, where cation exchange was the main adsorption mechanism. The average distribution coefficient of Zn2+ at low ppm level was 16.81 L/g for P-200, higher than those of the red mud (0.3 L/g) and the prepared P-120 (1.48 L/g) and P-270 (5.48 L/g), demonstrating that P-200 had the best adsorption capacity for Zn2+ and can be served as a practical adsorbent for real-world applications. To our knowledge, this is the first study to report the conversion of red mud into a magnetic adsorbent under mild conditions.

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“…To obtain an abundant low cost of ferrites, the resource utilization methods have been applied in the treatment of waste materials, i. e., electroplating wastewater (EPW) [8], electroplating sludge [9], groundwater treatment sludge [10], red mud in alumina refineries [11], and acid mine drainage [12]. Nevertheless, there are high amounts of metal ions included in EPW, and the "Ferrite process" has been proven to be the effective way for treating EPW [13].…”

Section: Introductionmentioning

confidence: 99%

Metal recovery based magnetite near-infrared photocatalyst with broadband spectrum utilization property

Huang

Wang

Zhu

et al. 2016

Applied Catalysis B: Environmental

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A novel conversion of the groundwater treatment sludge to magnetic particles for the adsorption of methylene blue

Cited by 74 publications

References 35 publications

The properties of sludge formed as a result of coagulation of backwash water from filters removing iron and manganese from groundwater

The properties of sludge formed as a result of coagulation of backwash water from filters removing iron and manganese from groundwater

Hydrothermal Conversion of Red Mud into Magnetic Adsorbent for Effective Adsorption of Zn(II) in Water

Metal recovery based magnetite near-infrared photocatalyst with broadband spectrum utilization property

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