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ELECTROCHEMICAL REDUCTION OF MUNITIONS WASTEWATER-BENCH SCALE AND PILOT SCALE STUDIES

DOPPALAPUDI, RAJESH BABU
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1004555095

Abstract Details

2001, MS, University of Cincinnati, Engineering : Environmental Engineering.
The munitions wastewater is observed to be mainly of two kinds: (1) 2,4-dinitrotoluene (DNT) in the presence of ethanol and (2) a mixture of 2,4,6-trinitrotoluene (TNT) and hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX). This research evaluates the performance of electrochemical processes in reducing these nitroaromatics. Experiments were conducted by using simulated wastewater. Initially experiments were conducted on a bench scale batch reactor to study the effect of various parameters including the applied current, stir rate, and dissolved oxygen on the reduction of nitroaromatics. Based on the results obtained from the bench scale experiments, a continuous flow pilot scale reactor was designed and developed. Experiments simulating batch conditions were first conducted on the pilot scale reactor to study the effect of current, type of electrolyte, and the ionic strength of the feed solution. Experiments were then conducted on the reactor to study the reduction of DNT in a continuous flow mode. Results obtained from the bench scale experiments showed an increase in reduction of nitroaromatics with an increase in current. But at higher currents (53mA & 65mA) the rates of reduction stabilized indicating that at such higher currents mass transfer governs the rates of reduction. The rates of reduction also increased with an increase in stir rate. Batch simulation experiments conducted on the pilot scale reactor showed that the rates of reduction of DNT increase with an increase in current or concentration of electrolyte. Again the rates of reduction at higher currents (150 and 200mA) stabilized, further confirming the effect of mass transfer limitations at higher currents. Based on the results obtained from the batch simulation experiments, continuous flow experiments were conducted at three different currents (150, 200 and 300mA). 200 mA was observed to be the optimal value of the applied current for the reduction of DNT. For an applied current of 200mA, 80% reduction of DNT was obtained. At the end of each experiment end products were analyzed to identify and quantify the various intermediates formed during the electrochemical reduction of itroaromatics. End products determined for all the experiments showed 60-100% molar balance conversion. Most of the termediates were observed in the solid phase probably due to the polymerization of intermediates during the reduction of nitroaromatics.
Dr. George Sorial (Advisor)
138 p.
Engineering, Environmental
munitions; electrochemical; DNT; TNT; RDX

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Citations

  • DOPPALAPUDI, R. B. (2001). ELECTROCHEMICAL REDUCTION OF MUNITIONS WASTEWATER-BENCH SCALE AND PILOT SCALE STUDIES [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1004555095

    APA Style (7th edition)

  • DOPPALAPUDI, RAJESH. ELECTROCHEMICAL REDUCTION OF MUNITIONS WASTEWATER-BENCH SCALE AND PILOT SCALE STUDIES. 2001. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1004555095.

    MLA Style (8th edition)

  • DOPPALAPUDI, RAJESH. "ELECTROCHEMICAL REDUCTION OF MUNITIONS WASTEWATER-BENCH SCALE AND PILOT SCALE STUDIES." Master's thesis, University of Cincinnati, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1004555095

    Chicago Manual of Style (17th edition)

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© 2001, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.