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Impacts of microbial inoculator generators (MIGs) on nitrogenous compounds in septic systems : a thesis submitted to the faculty of the Milwaukee School of Engineering in partial fulfillment of the requirements for the degree of Master of Science in Civil Engineering / by Jill M. Vande Boom.

by Vande Boom, Jill M. author., Nelson, Douglas , Mahuta, Dr. Frank , MacDonald, Jeffrey , Milwaukee School of Engineering

[Milwaukee School of Engineering], [ 2018]

Sewage disposal plants

Civil engineering

Nitrogen Removal

Microbial Innoculator Generator (MIG)

Integrated Fixed Film

Activated Sludge

Nitrification Process

Nutrient Removal

Denitrification

Wastewater Treatment

Domestic Wastewater

Wisconsin Department of Natural Resources (WDNR)

leaves : illustrations, some of which are in color ; 29 cm

List of Figures -- List of Tables -- Nomenclature -- Impacts of Microbial Inoculator Generators (MIGs) on Nitrogenous Compounds in Septic Systems -- Wastewater Treatment Methods for Total Nitrogin Removal: An Overview -- Background; Wasterwater Treatment Systems: Technical Details; Activated sludge; Fixed film; Integrated fixed film activated sludge; Microbial inoculator generator -- Nitrogen Removal; Microbiology -- Methods; Description of Pilot Unit; Data Collection; Project's Statistical Analysis Method; Composite Sampling; Numerical Demonstration -- Results; Pilot System Trial 1; Pilot System Trial 2; Trial 1 and 2 Overall Data Analysis; Statistical Analysis -- Conclusion -- Recommendations -- References -- Appendix A - Pilot System Trial 1 Data Collection -- Appendix B - Pilot System Trial 2 Data Collection -- Appendix C - Copyright Letter of Authorization.

The purpose of this paper is to investigate the fate, transportation, and transformation of nitrogen compounds through a microbial innoculator generator (MIG), which is a modification of an integrated fixed film activated sludge (IFAS) system. The research goal was to determine whether or not a MIG system in a commercial setting is capable of meeting the Wisconsin Department of Natural Resources (WDNR) groundwater discharge total nitrogen (TN) permit level. The current permit level is less than 10 mg/L. The research methodology first entailed a review of relevant literature. The results include comparisons between activated sludge (AS), fixed film (FF), IFAS, and MIG systems. An IFAS system is similar to a MIG, except an IFAS does not require a bacteria stock to be added to the system to reach operational objectives. The research includes information in regard to nitrogen removal involving the ammonification, nitrification, and denitrification process. The research was used to create operation parameters for a MIG pilot system at the Oconomowoc Wastewater Treatment Facility (OWWTF). The parameters involved maintaining flow rate and dissolved oxygen (DO) concentrations within the pilot system. To evaluate the performance of the MIG system, influent and effluent wastewater data samples were obtained during two collection periods. Data were analyzed using Composite Sampling techniques and a Monte Carlo simulation. In this project, it was found that the system requires a lower flow rate and extreme zones for DO concentration to reach a lower total nitrogen (TN) concentration in the effluent. The current parameters feature TN concentrations between 25.4 and 26.7 mg/L TN.

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