Quantitative Recovery of Microplastics from Sediments Using an Integrated Foam Flotation Method with a Biodegradable Surfactant
DOI:
https://doi.org/10.15377/2409-983X.2026.13.3Keywords:
Microplastics, Foam flotation, Sediment analysis, Microplastic extraction, Biodegradable surfactantAbstract
Sediments represent an important sink for microplastics, making efficient separation and recovery essential for their quantitative and qualitative analysis. In this study, an integrated froth-flotation method was developed for recovering microplastics from artificially prepared sediment samples using alkyl polyglucoside (APG) as a biodegradable surfactant. The effects of airflow rate, APG concentration, particle size, polymer type, and surfactant characteristics on flotation behavior were systematically evaluated. Under the selected operating conditions, including an airflow rate of 200 mL/min, the APG assisted flotation system achieved recovery efficiencies approaching 100% for the tested microplastics, including relatively high density polymers, and the separation process could be completed within approximately 2 min. The results further indicated that surfactant concentration and particle size influenced flotation behavior through changes in microplastic wettability and bubble particle interactions. Compared with conventional density and oil assisted separation approaches, the integrated flotation system provides rapid flotation and direct collection without requiring a high density salt solution or an additional oil phase. These findings demonstrate the potential of APG assisted froth flotation as a rapid approach for microplastic recovery from sediment matrices under controlled laboratory conditions.
References
[1] Shukla S, Pei Y, Li WG, Pei DS. Toxicological research on nano and microplastics in environmental pollution: current advances and future directions. Aquat Toxicol. 2024; 270: 106894. https://doi.org/10.1016/j.aquatox.2024.106894
[2] Andrady AL. Microplastics in the marine environment. Mar Pollut Bull. 2011; 62: 1596-1605. https://doi.org/10.1016/j.marpolbul.2011.05.030
[3] Liang D, Shan R, Gu J, Cheng P, Wang SX, Li DN, et al. Analysis, risk assessment and treatment of aquatic micro/nanoplastics: a critical review. Sep Purif Technol. 2025; 354: 129418. https://doi.org/10.1016/j.seppur.2024.129418
[4] Swathi Priya P, Parsai Tanushree. Synergistic human health risks of microplastics and co-contaminants: a quantitative risk assessment in water. J Hazard Mater. 2025; 491: 137809. https://doi.org/10.1016/j.jhazmat.2025.137809
[5] Xiong YJ, Zhao ZQ, Peng KM, Zhai GQ, Huang XF, Zeng HB. Microplastic interactions with co-existing pollutants in water environments: synergistic or antagonistic roles on their removal through current remediation technologies. J Environ Manage. 2025; 376: 124355. https://doi.org/10.1016/j.jenvman.2025.124355
[6] Jiang W, Yan XT, Lv Y. A critical review on the migration, transformation, sampling, analysis and environmental effects of microplastics in the environment. J Environ Sci. 2025; 154: 645-64. https://doi.org/10.1016/j.jes.2024.05.018
[7] Kärkkäinen N, Selonen S, Hartonen K, Sillanpää M. Microplastic pollution via wastewater effluent and sewage sludge: special focus on microplastic fibres in compost. Water Air Soil Pollut. 2025; 236: 911. https://doi.org/10.1007/s11270-025-08563-1
[8] Du J, Chen TT, Niu LX, Zhi LX, Qiu LL, Zhou QW, et al. The impact of microplastics on the dissemination, persistence, and ecotoxicological effects of antibiotic resistance genes in terrestrial ecosystems. Water Air Soil Pollut. 2025; 236: 996. https://doi.org/10.1007/s11270-025-08647-y
[9] Sforzi L, Santini S, Sarti C, Scopetani C, Martellini T, Mumtaz A, et al. Microplastic pollution in freshwater sediments: spatial-temporal patterns. Curr Pollut Rep. 2025; 11: 43. https://doi.org/10.1007/s40726-025-00373-7
[10] Narayanan M. Origination, fate, accumulation, and impact of microplastics in a marine ecosystem and bio/technological approach for remediation: a review. Process Saf Environ Prot. 2023; 177: 472-85. https://doi.org/10.1016/j.psep.2023.07.013
[11] Horton AA, Walton A, Spurgeon DJ, Lahive E, Svendsen C. Microplastics in freshwater and terrestrial environments: evaluating the current understanding to identify the knowledge gaps and future research priorities. Sci Total Environ. 2017; 586: 127-41. https://doi.org/10.1016/j.scitotenv.2017.01.190
[12] Van Cauwenberghe L, Devriese L, Galgani F, Robbens J, Janssen CR. Microplastics in sediments: a review of techniques, occurrence and effects. Mar Environ Res. 2015; 111: 5-17. https://doi.org/10.1016/j.marenvres.2015.06.007
[13] Prata JC, da Costa JP, Duarte AC, Rocha-Santos T. Methods for sampling and detection of microplastics in water and sediment: a critical review. TrAC Trends Anal Chem. 2019; 110: 150-9. https://doi.org/10.1016/j.trac.2018.10.029
[14] Hidalgo-Ruz V, Gutow L, Thompson RC, Thiel M. Microplastics in the marine environment: a review of the methods used for identification and quantification. Environ Sci Technol. 2012; 46: 3060-75. https://doi.org/10.1021/es2031505
[15] Yang L, Zhang Y, Kang S, Wang Z, Wu C. Microplastics in freshwater sediment: a review on methods, occurrence, and sources. Sci Total Environ. 2021; 754: 141948. https://doi.org/10.1016/j.scitotenv.2020.141948
[16] Adomat Y, Grischek T. Sampling and processing methods of microplastics in river sediments-a review. Sci Total Environ. 2021; 758: 143691. https://doi.org/10.1016/j.scitotenv.2020.143691
[17] Grbic J, Nguyen B, Guo E, You JB, Sinton D, Rochman CM. Magnetic extraction of microplastics from environmental samples. Environ Sci Technol Lett. 2019; 6: 68-72. https://doi.org/10.1021/acs.estlett.8b00671
[18] Munno K, Helm PA, Jackson DA, Rochman C, Sims A. Impacts of temperature and selected chemical digestion methods on microplastic particles. Environ Toxicol Chem. 2018; 37: 91-8. https://doi.org/10.1002/etc.3935
[19] Shim WJ, Song YK, Hong SH, Jang M. Identification and quantification of microplastics using Nile Red staining. Mar Pollut Bull. 2016; 113: 469-76. https://doi.org/10.1016/j.marpolbul.2016.10.049
[20] Maes T, Jessop R, Wellner N, Haupt K, Mayes AG. A rapid-screening approach to detect and quantify microplastics based on fluorescent tagging with Nile Red. Sci Rep. 2017; 7: 44501. https://doi.org/10.1038/srep44501
[21] Käppler A, Fischer D, Oberbeckmann S, Schernewski G, Labrenz M, Eichhorn KJ, et al. Analysis of environmental microplastics by vibrational microspectroscopy: FTIR, Raman or both? Anal Bioanal Chem. 2016; 408: 8377-91. https://doi.org/10.1007/s00216-016-9956-3
[22] Löder MGJ, Imhof HK, Ladehoff M, Löschel LA, Lorenz C, Mintenig S, et al. Enzymatic purification of microplastics in environmental samples. Environ Sci Technol. 2017; 51: 14283-92. https://doi.org/10.1021/acs.est.7b03055
[23] Lechthaler S, Hildebrandt L, Stauch G, Schüttrumpf H. Canola oil extraction in conjunction with a plastic free separation unit optimises microplastics monitoring in water and sediment. Anal Methods. 2020; 12: 5128-39. https://doi.org/10.1039/D0AY01574A
[24] Wu YF, Xu EL, Liu X, Miao ZY, Jiang XF, Han YZ. Flotation and separation of microplastics from the eye-glass polishing wastewater using sec-octyl alcohol and diesel oil. Process Saf Environ Prot. 2022; 164: 291-8. https://doi.org/10.1016/j.psep.2022.06.014
[25] Joshua AM, Aznir PAD, Lau EV. Understanding microplastic flotation through microbubble-microplastic interactions. Surf Interfaces. 2025; 64: 106399. https://doi.org/10.1016/j.surfin.2025.106399
[26] Yuan FY, Yuan H, Dai CL, Yu W, Du JY, Yang XJ, et al. Study on the process of microplastic fiber attachment to a rising microbubble-implications for flotation separation. J Environ Chem Eng. 2025; 13: 116819. https://doi.org/10.1016/j.jece.2025.116819
[27] Crutchett TW, Bornt KR. A simple overflow density separation method that recovers >95% of dense microplastics from sediment. MethodsX. 2024; 12: 102638. https://doi.org/10.1016/j.mex.2024.102638
[28] Nuelle MT, Dekiff JH, Remy D, Fries E. A new analytical approach for monitoring microplastics in marine sediments. Environ Pollut. 2014; 184: 161-9. https://doi.org/10.1016/j.envpol.2013.07.027
[29] Coppock RL, Cole M, Lindeque PK, Queirós AM, Galloway TS. A small-scale, portable method for extracting microplastics from marine sediments. Environ Pollut. 2017; 230: 829-37. https://doi.org/10.1016/j.envpol.2017.07.017
[30] Quinn B, Murphy F, Ewins C. Validation of density separation for the rapid recovery of microplastics from sediment. Anal Methods. 2017; 9: 1491-8. https://doi.org/10.1039/C6AY02542K
[31] Shaw KR, Sandquist R, Fairclough C, Black J, Fitzgerald A, Shaw JT, et al. Separation of microplastics from deep-sea sediment using an affordable, simple to use, and easily accessible density separation device. Microplast Nanoplast. 2024; 4: 16. https://doi.org/10.1186/s43591-024-00093-7
[32] Duong TT, Le PT, Nguyen TNH, Hoang TQ, Ngo HM, Doan TO, et al. Selection of a density separation solution to study microplastics in tropical riverine sediment. Environ Monit Assess. 2022; 194(2): 65. https://doi.org/10.1007/s10661-021-09664-0
[33] Cutroneo L, Reboa A, Geneselli I, Capello M. Considerations on salts used for density separation in the extraction of microplastics from sediments. Mar Pollut Bull. 2021; 166: 112216. https://doi.org/10.1016/j.marpolbul.2021.112216
[34] Scopetani C, Chelazzi D, Mikola J, Leiniö V, Heikkinen R, Cincinelli A, et al. Olive oil-based method for the extraction, quantification and identification of microplastics in soil and compost samples. Sci Total Environ. 2020; 733: 139338. https://doi.org/10.1016/j.scitotenv.2020.139338
[35] Yuan M, Zhang Y, Guo W, Chen S, Qiu Y, Zhang P. A rapid staged protocol for efficient recovery of microplastics from soil and sediment matrices based on hydrophobic separation. Mar Pollut Bull. 2022; 182: 113978. https://doi.org/10.1016/j.marpolbul.2022.113978
[36] Zhang B, Chen L, Chao JY, Yang X, Wang Q. Research progress of microplastics in freshwater sediments in China. Environ Sci Pollut Res. 2020; 27: 31046-60. https://doi.org/10.1007/s11356-020-09473-x
[37] Bellasi A, Binda G, Pozzi A, Boldrocchi G, Bettinetti R. The extraction of microplastics from sediments: an overview of existing methods and the proposal of a new and green alternative. Chemosphere. 2021; 278: 130357. https://doi.org/10.1016/j.chemosphere.2021.130357
[38] Zhang Y, Jiang H, Bian K, Wang H, Wang C. Is froth flotation a potential scheme for microplastics removal? Analysis on flotation kinetics and surface characteristics. Sci Total Environ. 2021; 792: 148345. https://doi.org/10.1016/j.scitotenv.2021.148345
[39] Jiang H, Zhang Y, Bian K, Wang C, Xie X, Wang H, Zhao H. Is it possible to efficiently and sustainably remove microplastics from sediments using froth flotation? Chem Eng J. 2022; 448: 137692. https://doi.org/10.1016/j.cej.2022.137692
[40] Claessens M, Van Cauwenberghe L, Vandegehuchte MB, Janssen CR. New techniques for the detection of microplastics in sediments and field collected organisms. Mar Pollut Bull. 2013; 70: 227-33. https://doi.org/10.1016/j.marpolbul.2013.03.009
[41] Zhu X. Optimization of elutriation device for filtration of microplastic particles from sediment. Mar Pollut Bull. 2015; 92: 69-72. https://doi.org/10.1016/j.marpolbul.2014.12.054
[42] Imhof HK, Schmid J, Niessner R, Ivleva NP, Laforsch C. A novel, highly efficient method for the separation and quantification of plastic particles in sediments of aquatic environments. Limnol Oceanogr Methods. 2012; 10: 524-37. https://doi.org/10.4319/lom.2012.10.524
[43] Hurley RR, Lusher AL, Olsen M, Nizzetto L. Validation of a method for extracting microplastics from complex, organic-rich, environmental matrices. Environ Sci Technol. 2018; 52: 7409-17. https://doi.org/10.1021/acs.est.8b01517
[44] Li H, Yu XY, Fu ZH, Qiu K, Wang JY, Lu SX. Kinetics and dynamics of gas-liquid separation and bubble generation in surfactant solutions: role of bulk/interfacial properties and hydrodynamic conditions. Sep Purif Technol. 2025; 355: 129483. https://doi.org/10.1016/j.seppur.2024.129483
[45] Silva LMS, Galan-Díaz JJ. Comparative analysis of critical micelle concentration of cationic surfactants determined by conductivity, sound velocity, and density using weighted orthogonal distance regression. Surf Interfaces. 2025; 56: 105620. https://doi.org/10.1016/j.surfin.2024.105620
[46] Jiang BY, Gao GY, Wang XH, Ren B, Shi SL, Wang J. The effect of various anionic types of inorganic salts on the wettability of solutions of surfactants. Process Saf Environ Prot. 2025; 200: 107367. https://doi.org/10.1016/j.psep.2025.107367
[47] Chen Y, Petkov JT, Ma K, Li P, Webster JRP, Penfold J, et al. Manipulating the hydrophilic/hydrophobic balance in novel cationic surfactants by ethoxylation: the impact on adsorption and self-assembly. J Colloid Interface Sci. 2024; 674: 405-15. https://doi.org/10.1016/j.jcis.2024.06.174
[48] Sun HM, Zhou S, Jiang YJ, Qin ZM, Fei J, Sun YB, et al. Effect of cationic, anionic and non-ionic surfactants on transport of microplastics: role of adhesion of surfactants on the polyethylene surface. J Hydrol. 2022; 612: 128051. https://doi.org/10.1016/j.jhydrol.2022.128051
[49] Jiang H, Bu J, Bian K, Su J, Wang Z, Sun H, et al. Surface change of microplastics in aquatic environment and the removal by froth flotation assisted with cationic and anionic surfactants. Water Res. 2023; 233: 119794. https://doi.org/10.1016/j.watres.2023.119794
[50] Felsing S, Kochleus C, Buchinger S, Brennholt N, Stock F, Reifferscheid G. A new approach in separating microplastics from environmental samples based on their electrostatic behavior. Environ Pollut. 2018; 234: 20-8. https://doi.org/10.1016/j.envpol.2017.11.013
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