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Item Information   Holdings       More by this author     Detzer, Timothy R.     Subjects     Constructed wetlands     Water reuse     Sewage     MSEV Project.     Browse Catalog     by author:      Detzer, Timothy R.       by title:      The effects of incre...         MARC Display

The effects of increased organic and nutrient loading in a subsurface flow constructed wetland / by Timothy R. Detzer. by Detzer, Timothy R. Subjects Constructed wetlands   Water reuse   Sewage   MSEV Project. Description:  85 leaves : ill. ; 28 cm. Contents:  Advisors: Jeffrey MacDonald, Kenneth Kaszubowski, Dr. Francis Mahuta Introduction and background -- Literature review -- Methodology -- Results and discussion -- Conclusions and recommendations -- References -- Appendices -- 1- Design criteria for constructed wetlands at Riveredge Nature Center 2- Augmented flow and applied BOD 3- Proposed feed system 4- Synthetic wastewater feed schedule 5- Organic mass loading 6- Sampling results 7- COD removal graph 8- Ammonia removal graph 9- Effluent COD concentration predictions The Riveredge Nature Center in Newburg, WI, utilizes a subsurface flow constructed wetland to treat water. The wetland was over-designed, and to date, has performed to design capacity in removing biochemical oxygen demand (BOD) and nitrogen (N). The purpose of this project was to increase the organic and nitrogen load to the wetland, to determine the systems capacity, and to compare the results with current engineering models to determine if they would accurately predict the wetland's performance. To increase the organic and nitrogen load to the wetland, synthetic wastewater was added to the system's sepitc tanks. To determine the effects of increased loading into the wetlands samples were analyized for Chemical Oxygen Demand(COD), ammonia, and nitrates. Mass loading of organics was increased to almost ten times the nornal level. Sample analysis for COD with and EPA approved block digester and colorimeter gave imprecise results. COD removal ranged from 50-100%. The mass loading capacity of the wetland appears to range from 3 to 5 lbs./day BOD based on COD effluent concentrations during the experiment. Nitrogen loading to the system was not increased dramatically. Ammonia concentrations up to approximately 63 mg/L (highest concentration) were added to the system. Ammonia removal ranged from 50-90%. Nitrates were not present at any point within the system. Increased nitrogen loading had no significant effects on effluent quality. First-order plug-flow and complete-mix equations used to predict COD concentrations in effluent, had an average difference throughout the wetland of 33 mg/L and 34 mg/L, respectively, when compared to experimental values. These effluent predictions were closer to experimental values from the midpoint of the system. Longer-term study and more precision sampling techniques would be beneficial for determining the wetland's capacity. The system may have equilibrated to the highest BOD influent concentrations given more time.   Copy/Holding information Location Collection Call No. Status   Walter Schroeder Library Master's Theses AC805 .D489 2000 Available Add Copy to MyList Format: HTMLPlain textDelimited Subject:   Email to:

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