Effect of heterogeneity correlation scale on pump and treat remediation design

Güngör Demirci, Gamze
Aksoy, Ayşegül
Pump-and-treat (P&T) remediation is a commonly used technology for the cleanup of contaminated groundwater. The long remediation time, high capital and operational costs are the most important problems associated with these systems. One of the determinants that affect the remediation design and its outcome is the spatial heterogeneity in the hydraulic conductivity (K) field. In this study, the effect of correlation scale (length) (lambda) of the heterogeneous K-field on P&T remediation design and costs was investigated. For this purpose, several synthetic K-fields of similar means and variances (sigma 2) but different lambdas were generated using a random field generator. Simulation-optimization approach was used in order to conduct the study. For this purpose, BIO2D-KE linked with a genetic algorithm library was used. Runs were conducted in order to determine the best pumping policies and costs for the heterogeneous fields. According to the initial results, lambda of the spatial variation in K impacted P&T remediation design and costs. The number of wells, pumping rates, and costs of remediation varied for different lambdas. This outcome was more pronounced for higher sigma 2 of the spatially variable K-field. © 2007 ASCE.


Effects of operational parameters and ultrasonic pretreatment on supercritical CO2 extraction of diesel fuel from soil
Guvenc, A; Mehmetoglu, U; Mehmetoglu, T (Informa UK Limited, 2004-01-01)
Supercritical fluid extraction (SFE) using CO2 was performed on soil material artificially contaminated with diesel fuel. Raising the temperature from 313 K to 343 K caused the recovery efficiency to increase from 52 to 76%. Pressure and CO2 flow rate were found to be less important. As expected, increasing extraction time resulted in higher recoveries. Ultrasonic pretreatment of the soil material was found to be very effective, possibly due to disrupting the strong interaction bonding between soil matrix a...
Influence of nickel (II) and chromium (VI) on the laboratory scale rotating biological contactor
Taseli, B. K.; Gökçay, Celal Ferdi; Gurol, A. (Springer Science and Business Media LLC, 2008-09-01)
High concentration of heavy metals is toxic for most microorganisms and cause strict damage in wastewater treatment operations and often a physico-chemical pretreatment prior to biological treatment is considered necessary. However, in this study it has been shown that biological systems can adapt to Ni (II) and Cr (VI) when their concentration is below 10 and 20 mg/L, respectively. The aim of this study was to evaluate the effect of Ni (II) and Cr (VI) on the lab-scale rotating biological contactor process...
Zamana bağlı sorpsiyon sitelerinin optimum pompaj ve arıtım tasarımı üzerindeki etkileri
Güngör Demirci, Gamze; Aksoy, Ayşegül (2012-01-01)
Kirlenmiş sahalarda kirleticilerin toprağa tutunmuş halde bulunabilmesi ve suya çözünmenin yavaş olması, pompaj ve arıtım yöntemiyle temizleme tasarımını ve maliyetlerini etkileyebilir. Bu çalışmada, 1-f faktörünün optimum temizleme tasarımı ve maliyeti üzerindeki etkileri incelenmiştir. f, zamana bağlı sorpsiyonu tanımlamak için sıklıkla kullanılan iki-siteli sorpsiyon modelinde yer alır ve 1-f zamana bağlı sorpsiyon sitelerinin oranını gösterir. Çalışmada benzetim-eniyileme yöntemi kullanılarak, 5 fa...
Effect of drainage properties on seepage behavior of earth fill dams
Çalamak, Melih; Yanmaz, Ali Melih (2016-09-23)
Earth-fill dams should be designed in such a way that excessive pore water pressures and seepage are controlled for attaining the desired safety level. This type of dams can be supplemented by some drainage facilities, such as blanket and chimney drains, which are commonly composed of graded soils. The key issue in designing a drainage facility is to promote the effectiveness of the system in reducing the pore water pressures and the seepage quantity. The performance of the drainage facility is based on its...
Effect of extracellular polymer composition of activated sludge on the removal of heavy metals by biosorption
Yüncü, Bilgen; Yetiş, Ülkü; Sanin, F. Dilek; Department of Environmental Engineering (2003)
Activated sludge microorganisms can remove many hazardous substances from wastewater by adsorbing and concentrating them on their surfaces. Biosorption of these substances onto activated sludge surfaces are influenced by the chemical properties of the substance in question as well as the surface properties of the microorganisms. The purpose of this study is to identify the biosorption mechanisms of heavy metals and the effect of extracellular polymer (ECP) composition of activated sludge on the biosorption ...
Citation Formats
G. Güngör Demirci and A. Aksoy, “Effect of heterogeneity correlation scale on pump and treat remediation design,” presented at the World Water and Environmental Resources Congress, 21 - 25 Mayıs 2006, Omaha, Amerika Birleşik Devletleri, 2006, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/71264.