Coupled effect of flow velocity and structural heterogeneity on transport and release of kaolinite colloids in saturated porous media

Mao, Meng; Zheng, Xiaoli; Chen, Chong; Zhao, Kang; Yan, Chaorui; Sharma, Prabhakar; Shang, Jianying

doi:10.1007/s11356-020-09806-w

Cited by 5 publications

(4 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Additionally, smaller biochar particles can penetrate deeper into the aqueous environment, reaching MP sources present throughout the water column. This phenomenon has also been observed in other studies with quartz sand particles (Sharma et al, 2014;Mao et al, 2020). However, the surface morphology of biochar is more complex than that of sand, and the shape and pyrolysis temperature of biochar particles also influence their interaction with MPs (Wang et al, 2020b).…”

Section: Frontiers In Environmental Sciencesupporting

confidence: 82%

Removal of microplastics from agricultural runoff using biochar: a column feasibility study

Olubusoye,

Cizdziel,

Wontor

et al. 2024

Front. Environ. Sci.

View full text Add to dashboard Cite

Plastics are extensively used in agriculture, but their weathering and degradation generates microplastics (MPs) that can be carried by runoff into water bodies where they can accumulate and impact wildlife. Due to its physicochemical properties, biochar has shown promise in mitigating contaminants in agricultural runoff. However, few studies have examined its effectiveness at removing MPs. In this study, we assessed MP pollution (>30 μm) in runoff from a farm in the Mississippi Delta and examined the effectiveness of biochar (pinewood and sugarcane) to remove MPs from aqueous solutions. Using micro-Fourier Transform Infrared spectroscopy (µ-FTIR), we observed an average of 237 MPs/L (range 27–609) in the runoff, with most particles identified as polyethylene, polyamide, polyvinyl chloride, polyurethane, acrylonitrile butadiene styrene, and polyarylamide. Biochar columns effectively removed MPs from runoff samples with reductions ranging from 86.6% to 92.6%. MPs of different sizes, shapes, and types were stained with Nile red dye (to facilitate observation by fluorescence) and quantified their downward progress with multiple column volumes of water and wet/dry cycles. Smaller MPs penetrated the columns further, but ≥90% of MPs were retained in the ∼20 cm columns regardless of their shape, size, and type. We attribute these results to physical entrapment, hydrophobic behaviors, and electrostatic interactions. Overall, this proof-of-concept work suggests biochar may serve as a cost-effective approach to remove MPs from runoff, and that subsequent field studies are warranted.

show abstract

Section: Frontiers In Environmental Sciencesupporting

confidence: 82%

Removal of microplastics from agricultural runoff using biochar: a column feasibility study

Olubusoye,

Cizdziel,

Wontor

et al. 2024

Front. Environ. Sci.

View full text Add to dashboard Cite

show abstract

“…Therefore, aside from the solution conditions and colloid properties, the heterogeneity of the medium affects contaminant and colloid co-transport. Previous reports show that structural heterogeneity facilitated transport in kaolinite colloids, and colloids broke through earlier in strongly heterogeneous columns [15]. Mass exchange at the particle interface was observed in systems with coarse and fine particle channels [16].…”

Section: Author Copy • Author Copy • Author Copy • Author Copy • Auth...mentioning

confidence: 82%

“…was ball milled by a wet milling method at a sample-to-pure water ratio of 1:1 (g/mL) for 12 h using a planetary ball mill instrument (XGB04, Boyuntong Instrument Co., Ltd., Nanjing, China). After the samples were lyophilized, they were ultrasonically dispersed for 2 h (240 W), and then the as-prepared samples were left for 1 h, standing still [15,18,19]. The stable colloidal suspension of Bc, Kln, and Mnt was obtained by siphoning.…”

Section: Preparation Of Colloidsmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Bentonite Colloid on Cr(VI) Transport in Heterogeneous Porous Media

Gu,

Ding,

Shi

et al. 2024

Pol. J. Environ. Stud.

View full text Add to dashboard Cite

Co-transport of Cr(VI) with bentonite colloids (Bc) at different flow rate, pH, ion strength (IS), and colloid concentration in heterogeneous sand media was investigated. The results showed that obvious penetration of dissolved Cr(VI) in co-transport occurred at about 0.5PV, which was mainly due to the heterogeneity of the sand column. The maximum dimensionless transport fraction ((Ct/C0) max ) of dissolved Cr(VI) was 0.73 in the co-transport (200 mg•L -1 Bc and 2.5 ml min -1 ), much lower than that in the single transport of Cr(VI) (0.98). The increase of pH promoted the transport of Cr(VI) in co-transport with Bc. Elevated flow rate, ion strength, and Bc concentration reduced Cr(VI) transport. Cr(VI) in the effluent in co-transport with Bc was dominated by dissolved Cr(VI), and a small amount of colloidal Cr(VI) (～4.97%) was observed. The recovery rates of total transported Cr(VI) (dissolved +colloidal) in co-transport with Bc were obviously lower than those in single transport. (Ct/C0) max values of dissolved Cr(VI) in the co-transport with Bc were also lower than those with other colloids, e.g. kaolin colloid, montmorillonite colloid, and inorganic soil colloid. Application of bentonite may alleviate the transport risk of Cr(VI) to groundwater.

show abstract

Experimental investigations on scale-dependent dispersivity in three-dimensional heterogeneous porous media

Dong

Yin

et al. 2021

Environ Sci Pollut Res

View full text Add to dashboard Cite

Coupled effect of flow velocity and structural heterogeneity on transport and release of kaolinite colloids in saturated porous media

Cited by 5 publications

References 48 publications

Removal of microplastics from agricultural runoff using biochar: a column feasibility study

Removal of microplastics from agricultural runoff using biochar: a column feasibility study

Effect of Bentonite Colloid on Cr(VI) Transport in Heterogeneous Porous Media

Experimental investigations on scale-dependent dispersivity in three-dimensional heterogeneous porous media

Contact Info

Product

Resources

About