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Potential for Nitrogen Losses from On-Site Wastewater Treatment Systems on Poorly Drained Soils to Curtain Drains

Ghumrawi, Marwa Jamal
http://rave.ohiolink.edu/etdc/view?acc_num=osu1471876488

Abstract Details

2016, Master of Science, Ohio State University, Food, Agricultural and Biological Engineering.
The poor internal drainage characteristics of the soils in Ohio pose a challenge to proper treatment of domestic wastewater in an On-Site Wastewater Treatment System, OSWTS. Seasonal high water tables in saturated soil cause only partial removal of pollutants from the wastewater, due to minimal time and space for proper natural processes. Most Ohio soils are not suitable for the safe operation of an OSWTS with a leach field system. To reduce the potential for OSWTS failure resulting from seasonal high water table conditions, Curtain drains are proposed to reduce or eliminate the potential for nitrogen leaching to surface waters from onsite wastewater treatment systems, OSWTS. The risk in the use of curtain drains is in their contribution to nonpoint source pollution by directly carrying pollutants into surrounding water bodies. Nutrients are not the only pollutants of concern from wastewater. Pathogenic parasites, bacteria, viruses, toxic organic compounds and metals impose high risks to public health. DRAINMOD is a tool specifically designed for use with poorly drainage soils to model shallow water tables and the hydrology in many of the Ohio soils classified as poorly drained and somewhat poorly drained. An improved version of the hydrologic model, DRAINMOD-N II has the capability to assess the nitrogen balance in agricultural subsurface drainage systems. The proposed study will model and analyze a designed matrix of drain depths, drain spacing, impeding depth and loading rate for the Blount Silt Loam soil at the Noland site to predict nitrogen drainage loss concentrations. The modeling study will be conducted for 31 years over the period 1982 to 2012. The model generates a daily output of drainage loss concentrations of NO3-N and NH4-N in kg/ha. These losses are predicted to be those of the curtain drains. Statistical analyses of the modeling results will be used to test the significance of nitrogen loss differences between the drain depths, drain spacings, impeding depths, and loading rates, in order to predict which factor has the strongest effect on the output. DRAIMOD N-II daily outputs of NO3-N and NH4-N drainage loss concentrations were prearranged and analyzed using Microsoft Excel, and Minitab. The statistical analysis conducted for this study were: Fit General Linear Model, Tukey’s Comparison of Means, Paired T-test, and Probability Plot. The differences in drain depth, drain spacing, and effluent loading rate resulted in significantly different exports of NO3-N into curtain drains. The drain spacings 183, 244, 488 cm were all significantly different from the rest of the spacings, except for drain spacings 305 cm and 366 cm they were not significantly different from each other but significantly different from the other treatment combinations. The drain depths 102, 117, and 147 cm were all significantly different in their effect on the nitrogen drainage loss. The combination of a DS of 183 cm and a DD of 147 cm was significantly different than the rest of the treatment combinations, with the highest nitrogen export into the curtain drains. The combination of a DS of 148 cm and a DD of 102 cm yielded the lowest nitrogen loss when the means were compared.
Larry C. Brown (Advisor)
Andrew Ward (Committee Member)
Norman Fausey (Committee Member)
183 p.
Agricultural Engineering
Agricultural Engineering, Nitrogen Losses from On-Site Wastewater Treatment Systems, Poorly Drained Soils to Curtain Drains

Recommended Citations

Citations

  • Ghumrawi, M. J. (2016). Potential for Nitrogen Losses from On-Site Wastewater Treatment Systems on Poorly Drained Soils to Curtain Drains [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1471876488

    APA Style (7th edition)

  • Ghumrawi, Marwa. Potential for Nitrogen Losses from On-Site Wastewater Treatment Systems on Poorly Drained Soils to Curtain Drains. 2016. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1471876488.

    MLA Style (8th edition)

  • Ghumrawi, Marwa. "Potential for Nitrogen Losses from On-Site Wastewater Treatment Systems on Poorly Drained Soils to Curtain Drains." Master's thesis, Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1471876488

    Chicago Manual of Style (17th edition)

osu1471876488
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This open access ETD is published by The Ohio State University and OhioLINK.