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- MakaleYalnız künye2013Scopus SJRQ3EFFECT OF THE PRESENCE OF PHOSPHATE BASED FERTILIZER ON METAL REMOVAL CAPACITY OF NATIVE BIORETENTION MATERIALS
Demir, Veysel; Bin-Shafique, Sazzad
Batch tests were conducted on several Texas native bioretention media to estimate the removal capacity of lead and copper from contaminated water and to understand the effect of the presence of phosphate (due to application of phosphate based fertilizers in the watershed) on metal removal. The results show that the 77% of lead and 58% of copper precipitated as the phosphate added to the contaminated water even before adding any media. Cedar mulch and hardwood mulch performed best and removed 99.2% of lead and 97.5% of copper from aqueous solution. When phosphate was added, removal increased to 97.8% for copper and 100% for lead (under detection limits). The removal capacity of metals was with the order of cedar mulch > hardwood mulch > pine mulch > sawdust > loam soil > silica sand. The leaching of metals from the media was much lower than the original solution and decreased when phosphate was added.
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İncele - MakaleAçık Erişim2013Scopus SJRQ4Column Studies on Effect of Phosphate Immobilization on Removal of Metals from Stormwater Runoff in Bioretention Cell
Demir, V.; Bin-Shafique, S.
Batch studies indicated that low cost native materials such as loam soil, juniper mulch, hardwood mulch, pine mulch and sawdust performed efficiently as media in bioretention cell for removal of copper and lead from stormwater runoff. Juniper mulch performed best in batch studies was used in column studies. Column studies suggested that the presence of phosphate has a pronounced effect on metal immobilization. This is due to the formation of metal phosphates that have extremely low solubility. The remaining metals were adsorbed on bioretention media of the bioretention cell. Breakthrough adsorption and desorption curves for lead and copper were measured in presence and absence of phosphate immobilization. Copper reached a breakthrough curve in around 20 days and lead in 30 days. Column studies showed that in all samples addition of phosphate also decreased the leaching of lead and copper back to aqueous solution consistent with lead and copper immobilization.
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