A critical review of control and removal strategies for microplastics from aquatic environments

Zhang, Yingshuang; Jiang, Hongru; Bian, Kai; Wang, Hui; Wang, Chongqing

doi:10.1016/j.jece.2021.105463

Cited by 94 publications

(39 citation statements)

References 214 publications

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“…Among various treatment methods in water treatment plants [54,55], clarification, sedimentation, density separation, coagulation and, or flocculation, activated sludge, sieving and filtration are considered conventional treatment processes in water treatment plants, and several studies have been focused on the removal efficiency of these treatment process for microplastic separation [56]. The basis of various physical, chemical, and biological methods conventionally applied in water treatment plants has been reviewed by Tirkey and Upadhyay and Zhang et al [57,58].…”

Section: Conventional Methods Of Microplastic Separationmentioning

confidence: 99%

Microplastics in Aquatic Environments: Recent Advances in Separation Techniques

Hadian-Ghazvini

Torkashvand

2022

Period. Polytech. Chem. Eng.

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Separation and removal of microplastic pollution from aquatic environments as a global environmental issue is classified as one of the major concerns in both water and wastewater treatment plants. Microplastics as polymeric particles less than 5 mm in at least one dimension are found with different shapes, chemical compositions, and sizes in soil, water, and sediments. Conventional treatment methods for organic separation have shown high removal efficiency for microplastics, while the separation of small microplastic particles, mainly less than 100 µm, in wastewater treatment plants is particularly challenging. This review aims to review the principle and application of different physical and chemical methods for the separation and removal of microplastic particles from aquatic environments, especially in water treatments process, with emphasis on some alternative and emerging separation methods. Advantages and disadvantages of conventional separation techniques such as clarification, sedimentation, floatation, activated sludge, sieving, filtration, and density separation are discussed. The advanced separation methods can be integrated with conventional techniques or utilize as a separate step for separating small microplastic particles. These advanced microplastic separation methods include membrane bioreactor, magnetic separation, micromachines, and degradation-based methods such as electrocatalysis, photocatalysis, biodegradation, and thermal degradation.

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Section: Conventional Methods Of Microplastic Separationmentioning

confidence: 99%

Microplastics in Aquatic Environments: Recent Advances in Separation Techniques

Hadian-Ghazvini

Torkashvand

2022

Period. Polytech. Chem. Eng.

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“…Microplastics will inevitably discharge into the aquatic environment, and further affect the survival of animals, plants, and microorganisms [29,30]. Several methods have been developed to remove MPs from wastewater, including filtration, coagulation, foam flotation, and magnetic separation [31][32][33][34][35]. However, these methods cannot efficiently remove smaller particle size plastics (<10 µm).…”

Section: Introductionmentioning

confidence: 99%

Removal of Polystyrene Microplastics from Aqueous Solution Using the Metal–Organic Framework Material of ZIF-67

Wan

Wang

Sheng

et al. 2022

Toxics

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Due to the continuous and adverse effects of microplastics on the environment, an increasing number of studies have begun to focus on their migration patterns and removal from aquatic environments. Herein, our study innovatively evaluated the ability of the capacity of ZIF-67, a novel metal–organic framework (MOF) material, to adsorb polystyrene (PS) microplastics (MPs) from aqueous solutions, aiming to explore the potential of MOF materials to remove MPs from wastewater. The adsorption ratio of PSMPs (5 mg/L, 30 mL) by ZIF-67 reached up to 92.1%, and the PSMP adsorption equilibrium was achieved within 20 min at 298 K. The adsorption of PSMPs would be favored at a pH of 8, a PSMPs solution concentration of 5 mg/L, and a temperature of 298 K. Further analyses demonstrated that hydrogen bond interactions, π-π stacking, and electrostatic interactions played a crucial role in the adsorption of PSMPs by ZIF-67 in aqueous solutions. Our findings thus provide insight into novel methods to remove MPs from acidic and weakly alkaline aquatic environments and wastewater.

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“…Given the growing awareness and concern over microplastics pollution, studies are now appropriately focused on developing methods that prevent their broader release into the environment. , Wastewater treatment plants are a key location for such prevention. Recent studies have shown that these plants efficiently capture microplastics within nutrient-rich biosolid waste during coagulation and settling. − Unfortunately, this sludge is often sold as fertilizer, thereby releasing the captured microplastics into the environment. , As a result, methods that remove microplastics upstream of sludge formation are needed . One emerging technology aimed at removing microplastics earlier in the treatment process involves using magnets to separate magnetic materials that adsorb microplastics, including nanotubes, coagulants, nanoparticles, and core–shell particles .…”

Section: Introductionmentioning

confidence: 99%

“…21,22 Given the growing awareness and concern over microplastics pollution, 23 studies are now appropriately focused on developing methods that prevent their broader release into the environment. 24,25 Wastewater treatment plants are a key location for such prevention. Recent studies have shown that these plants efficiently capture microplastics within nutrientrich biosolid waste during coagulation and settling.…”

Section: ■ Introductionmentioning

confidence: 99%

Using Adhesives to Capture Microplastics from Water

et al. 2021

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Microplastic pollution is omnipresenthaving been found in our land, air, food, and water. Over the last two decades, both identifying microplastics and sleuthing their sources has been a major research focus. Moving forward, the next goal should be remediation. Although removing microplastics from the environment is impractical, developing methods that prevent their release into the environment is essential. Herein, we report an approach for removing microplastics from water using a pressuresensitive adhesive. Specifically, we demonstrate that shaking zirconium silicate beads coated with poly(2-ethylhexyl acrylate) in aqueous suspensions containing polystyrene microplastics (10 μm) can remove up to 99% of the microplastics within 5 min. We show that the adhesive molar mass (ranging from 93−950 kg/ mol) is invariant with respect to removal efficiency at 5 min, as quantified by flow cytometry. Preliminary results suggest these adhesives can bind other microplastics as well, including nonpolar polymers (e.g., polyethylene, micronized rubber) and polar polymers (e.g., nylon, polyethylene terephthalate). Overall, this proof-of-concept study demonstrates a promising approach for remediating microplastics from aqueous suspensions using adhesives.

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A critical review of control and removal strategies for microplastics from aquatic environments

Cited by 94 publications

References 214 publications

Microplastics in Aquatic Environments: Recent Advances in Separation Techniques

Microplastics in Aquatic Environments: Recent Advances in Separation Techniques

Removal of Polystyrene Microplastics from Aqueous Solution Using the Metal–Organic Framework Material of ZIF-67

Using Adhesives to Capture Microplastics from Water

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