Numerical modeling of a recirculating groundwater nitrate remediation well system /
Nitrate is one of the most commonly identified ground water
| Main Author: | |
|---|---|
| Format: | Thesis Book |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1995.
|
| Subjects: | |
| Online Access: | Link to OAKTrust copy http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=742745501&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | Nitrate is one of the most commonly identified ground water contaminants. A new treatment system, called the "Recirculating Groundwater Remediation Well (RGRW) System", is proposed to reduce nitrate pollution. With this system, contaminated groundwater is brought into the lower screen section of a well , treated in the well casing, and returned clean to the aquifer at the upper screen section of the well. In order to determine the hydraulic and biological denitrification characteristics of the RGRW system, two computer models were developed to help design and operate the RGRW System. The first model employed a semi-analytical technique for predicting three-dimensional flow patterns and capture zones of the RGRW in the unconfined aquifer. This model can assist in the determination of the optimum number of RGRWS, their rates of discharge and locations. The second model was developed for simulating the nitrate transport and denitrification in the RGRW system. The model considered the interaction of nitrate, organic carbon and bacteria. The governing equations couple the nitrate transport equation, the carbon transport equation, the microbial growth and decay equation, as well as the denitrification equation in both of the treatment well (reactor) and aquifer. The nonlinear coupled equations were solved by using an Eulefian-Lagrangian method which is highly resistant to numerical dispersion in the presence of small dispersivities. The model was calibrated and verified against analytical solutions and laboratory experimental data. Sensitivity analyses were performed on both models. Discussion of the effects of the variations in key parameters on the modeling results provides insights into the RGRW system behaviors. It is concluded that these models are useful tool to help design and operate the RGRW systems. |
|---|---|
| Item Description: | Vita. "Major Subject: Civil Engineering". |
| Physical Description: | xii, 125 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references. |