Phosphorus and Metal Sorption in Aged Bioretention Cells with Fly-ash Amended Filter Media
Başlık:
Phosphorus and Metal Sorption in Aged Bioretention Cells with Fly-ash Amended Filter Media
Yazar:
Kandel, Saroj, author.
ISBN:
9780438086197
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (179 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-11(E), Section: B.
Advisors: Glenn Brown Committee members: Chad Penn; Dan Storm; Jason Vogel.
Özet:
Stormwater runoff from urban areas can transport a significant load of phosphorus (P) and heavy metals. Media samples from seven year old bioretention cells (BRC) were collected, to a depth of 0.6 m, to assess the accumulation of phosphorus and heavy metals. Analysis consisted of total soil digestion (T-P), Mehlich-3 (M3-P) and water soluble (WS-P) extraction for both metals and phosphorus. The mean T-P concentration increased over the seven years of operation, but the results were not statistically significant ( p > 0.05). The average M3-P and WS-P concentrations in the media profiles showed higher P accumulation in the top 0.15 m of media. Significant (p < 0.05) P concentration reductions of 68% to 75% were achieved between the influent and drain effluent and P mass reductions of 76% to 93% were observed. Most of the metal accumulated in the top 0.15m of media. Metal concentration in the media significantly increased ( p < 0.05) over the seven years compared to that of initial media samples. Significant zinc concentration reductions between influent and drain effluent of 56% to 60% were obtained, which corresponds to zinc mass reduction of 43% to 88%. The phosphorus and metals adsorption capacities were obtained from a series of batch and flow-through experiments. Both nonlinear forms of Langmuir and Freundlich isotherm models fitted the equilibrium data well (r2 > 0.9). The batch sorption experiments showed phosphorus adsorption capacity of the fly-ash filter media after seven years of operation was (160 mg/g) around half the amount of the initial material (350 mg/g). Batch testing of the aged fly-ash amended filter media exhibited phosphorus removal of 61%, Zn Cu and Pb removal of 95%, 98%, and 99%. Desorption experiments showed the media released 24% of initially sorbed phosphorus and only 0.6% of initially sorbed Zn and Cu at initial phosphorus and metal concentration of 30 mg/L. Thus, phosphorus and heavy metal adsorption in sand/fly-ash filter media may be considered irreversible, and can provide long-term phosphorus and heavy metal retention.
Notlar:
School code: 0664
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(687619.1) | 687619-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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