Quantification of microplastics in a highway stormwater filter system and design of filter soil material based on a column infiltration experiments
Author
Kelényi, Janka
Term
4. term
Publication year
2021
Pages
67
Abstract
This thesis investigates how effectively a highway stormwater filter installation retains microplastics and how microplastics accumulate within its soil layers. Water samples were collected at the filter inlet and outlet, and soil samples were taken from the installation. Samples underwent multi-step purification and were analyzed with FPA-µFTIR imaging spectroscopy to identify and quantify plastic particles. As a complementary laboratory study, column experiments packed with different filter soil mixtures were spiked with known quantities of microplastics (enumerated with FlowCam), and water volumes equivalent to annual rainfall were infiltrated. Post-infiltration, water and soil samples were purified and analyzed with FPA-µFTIR using a reference spectral library built from the spiked materials. Together, these approaches aim to assess retention efficiency and inform the design of effective filter soils for stormwater systems. Specific quantitative results and performance comparisons are not included in this excerpt.
Denne afhandling undersøger, hvor effektivt et motorvejsregnvandsfilter tilbageholder mikroplast, og hvordan mikroplast akkumuleres i filterets jordlag. Vandprøver blev indsamlet ved indløb og udløb, og jordprøver blev taget fra selve installationen. Prøverne gennemgik en flertrins oprensning og blev analyseret med FPA-µFTIR imaging-spektroskopi for at identificere og kvantificere plastpartikler. Som et supplerende laboratorieforsøg blev kolonner fyldt med forskellige filterjordblandinger tilsat kendte mængder mikroplast (kvantificeret med FlowCam), og vandmængder svarende til den årlige nedbør blev infiltreret. Efter infiltration blev vand- og jordprøver renset og analyseret med FPA-µFTIR, med et referencespektralbibliotek opbygget ud fra de tilsatte materialer. Tilgangen sigter mod at vurdere tilbageholdelseseffektivitet og understøtte design af effektive filterjordblandinger til regnvandssystemer. Specifikke kvantitative resultater og sammenligninger fremgår ikke af dette uddrag.
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