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Fouling and the long-term performanc...

Li, Lin.

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Fouling and the long-term performance of permeable reactive barriers.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Fouling and the long-term performance of permeable reactive barriers./
作者:	Li, Lin.
面頁冊數:	228 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-04, Section: B, page: 2034.
Contained By:	Dissertation Abstracts International65-04B.
標題:	Engineering, Environmental. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3128081

Fouling and the long-term performance of permeable reactive barriers.
Li, Lin.

Fouling and the long-term performance of permeable reactive barriers. - 228 p.

Source: Dissertation Abstracts International, Volume: 65-04, Section: B, page: 2034.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 2004.

A modeling study was conducted to investigate fouling and its impact on the long-term performance of permeable reactive barriers (PRBs) employing zero valent iron. MODFLOW and RT3D codes were used to simulate flow and reactive transport in PRBs with incorporating a geochemical algorithm that was developed for this study to simulate iron corrosion and mineral precipitation reactions occurring in PRBs. The models were validated with field data at two PRBs.Subjects--Topical Terms:

783782
Engineering, Environmental.

Fouling and the long-term performance of permeable reactive barriers.
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245 1 0 $a Fouling and the long-term performance of permeable reactive barriers.
300 $a 228 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-04, Section: B, page: 2034.
500 $a Supervisor: Craig H. Benson.
502 $a Thesis (Ph.D.)--The University of Wisconsin - Madison, 2004.
520 $a A modeling study was conducted to investigate fouling and its impact on the long-term performance of permeable reactive barriers (PRBs) employing zero valent iron. MODFLOW and RT3D codes were used to simulate flow and reactive transport in PRBs with incorporating a geochemical algorithm that was developed for this study to simulate iron corrosion and mineral precipitation reactions occurring in PRBs. The models were validated with field data at two PRBs.
520 $a Larger porosity reductions occur near the entrance of the PRB as a result of precipitation of carbonate minerals. Smaller porosity reductions occur after the mid-plane due to precipitation of Fe(OH)2. CaCO 3, FeCO3, and Fe(OH)2 are found to account for 99% of porosity reduction. Flow heterogeneity causes spatially variable porosity reductions and penetration of mineral forming ions deeper into the PRB. Porosity reductions are closely tied to the distribution of Darcy velocities, which reflects the balance between mass transport rate and geochemical reaction rates. The porosity reduction is the most sensitive to influent concentration of HCO3-, anaerobic iron corrosion rate, and level of aquifer heterogeneity.
520 $a Flows are redistributed throughout the PRB in response to fouling of the pore space. Under typical conditions, only subtle changes occur within the first 10 yr (i.e., duration of the current field experience record with PRBs) and the most significant changes do not occur until the PRB has operated for at least 30 yr. However, changes can occur sooner if the rate at which mineral forming ions are delivered to the PRB is higher than that expected (i.e., due to higher flow rate or higher influent concentrations). Seepage velocities in the PRB increase and residence times decrease, due to porosity reductions caused by fouling. Bypassing and reductions in flow rate occur when fouling becomes appreciable.
520 $a Installation of pea gravel equalization zones enhances preferential flow and causes more porosity reduction in the PRB. Sacrificial pretreatment zone, pH adjustment, larger ZVI particle, and mechanical treatment are effective strategies to limit fouling and to maintain more residence time in PRBs over decades.
590 $a School code: 0262.
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791 $a Ph.D.
792 $a 2004
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