Analysis of the heterogeneity scale effects on pump and treat aquifer remediation design

Download

index.pdf

Date

2009

Author

Güngör Demirci, Gamze

Metadata

Show full item record

Item Usage Stats

139
views

63
downloads

The effect of heterogeneity correlation scale of hydraulic conductivity (K), equilibrium distribution coefficient (Kd) and mass transfer rate on the design and cost of the P&T remediation system for different heterogeneity levels (defined by the variance (σ2lnK)) and parameter distributions under the rate-limited sorption conditions was evaluated in this study. In addition, the impacts of initial amount of contaminant mass and plume configuration on the remediation design and cost were explored. The effects of different K heterogeneity and remediation design conditions on the length of remediation period, the influence of anisotropy of K, correlation between K and Kd, and Kd and , and the fraction of equilibrium sorption sites (f) on the pump-and-treat (P&T) design and cost were the other studied subjects. In this study, simulation-optimization approach, in which a groundwater flow and contaminant transport simulation model was linked with a genetic algorithm (GA) library, was used. Results showed that not only the amount of PCE mass initially present in the aquifer was important in terms of P&T design, cost and remediation time, but also the location and size of the high and low K regions defined by λlnK as well as the magnitudes of K represented by geometric mean and σ2lnK were influential. It was also found that P&T designs utilizing higher numbers of wells with lower pumping rates may be more robust predicting the time-to-compliance compared to a single well with higher pumping rate for aquifers heterogeneous in K. Homogenous Kd assumption might cause serious error in both the design and the cost of remediation. The magnitude of this error may change depending on the spatial distribution of K and Kd, λlnKd, σ2lnKd and σ2lnK. The effect of heterogeneity in on the design and cost of remediation may or may not be significant depending on K, Kd and distributions, ln and σ2ln. Increased amount of kinetically sorbed mass defined by decreased f value resulted in more costly remediation.

Subject Keywords

Environmental engineering.

URI

http://etd.lib.metu.edu.tr/upload/3/12610559/index.pdf
https://hdl.handle.net/11511/18788

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Application of two receptor models for the investigation of sites contaminated with polychlorinated biphenyls : positive matrix factorization and chemical mass balance Demircioğlu, Filiz; İmamoğlu, İpek; Department of Environmental Engineering (2010) This study examines the application of two receptor models, namely Positive Matrix Factorization (PMF) and Chemical Mass Balance (CMB), on the investigation of sites contaminated with PCBs. Both models are typically used for apportionment of pollution sources in atmospheric pollution studies, however have gained popularity in the last decade on the investigation of PCBs in soil/sediments. The aim of the study is four-fold; (i) to identify the status of PCB pollution in Lake Eymir area via sampling and analy...
Assessment of diffusive and convective mechanisms during carbon dioxide sequestration into deep saline aquifers Özgür, Emre; Gümrah, Fevzi; Department of Petroleum and Natural Gas Engineering (2006) The analytical and numerical modeling of CO2 sequestration in deep saline aquifers having different properties was studied with diffusion and convection mechanisms. The complete dissolution of CO2 in the aquifer by diffusion took thousands, even millions of years. In diffusion dominated system, an aquifer with 100 m thickness saturated with CO2 after 10,000,000 years. It was much earlier in convective dominant system. In diffusion process, the dissolution of CO2 in aquifer increased with porosity increase; ...
Modeling of catalytic ozonation process in a three-phase reactor Erol, Funda; Oezbelge, Tuelay A.; Oezbelge, H. Oender (Informa UK Limited, 2009-01-01) In this research, the main objective was to determine the flow characteristics of a three-phase reactor in order to use this knowledge in the modeling of catalytic ozonation of aqueous dye solutions. Therefore, the stimulus-response method was used in the tracer experiments; thus, the degree of liquid mixing in the reactor was estimated by means of residence time distribution, Peclet number and axial dispersion coefficient in the presence and the absence of the catalyst. Experimental data were obtained by p...
Evaluation of PCB dechlorination pathways in anaerobic sediment microcosms using an anaerobic dechlorination model Demirtepe, Hale; Kjellerup, Birthe; Sowers, Kevin R.; İmamoğlu, İpek (Elsevier BV, 2015-10-15) A detailed quantitative analysis of anaerobic dechlorination (AD) pathways of polychlorinated biphenyls (PCBs) in sediment microcosms was performed by applying an anaerobic dechlorination model (ADM). The purpose of ADM is to systematically analyze changes in a contaminant profile that result from microbial reductive dechlorination according to empirically determined dechlorination pathways. In contrast to prior studies that utilized modeling tools to predict dechlorination pathways, ADM also provides quant...
CPT-based probabilistic and deterministic assessment of in situ seismic soil liquefaction potential Moss, R. E. S.; Seed, R. B.; Kayen, R. E.; Stewart, J. P.; Kiureghian, A. Der; Çetin, Kemal Önder (American Society of Civil Engineers (ASCE), 2006-08-01) This paper presents a complete methodology for both probabilistic and deterministic assessment of seismic soil liquefaction triggering potential based on the cone penetration test (CPT). A comprehensive worldwide set of CPT-based liquefaction field case histories were compiled and back analyzed, and the data then used to develop probabilistic triggering correlations. Issues investigated in this study include improved normalization of CPT resistance measurements for the influence of effective overburden stre...

Citation Formats

G. Güngör Demirci, “Analysis of the heterogeneity scale effects on pump and treat aquifer remediation design,” Ph.D. - Doctoral Program, Middle East Technical University, 2009.