Browsing by Subject "effluent"

Now showing 1 - 4 of 4
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    Altura Minnesota lagoon collapses
    (Proceedings of the First Multidisciplinary Conference on Sinkholes. Orlando, Florida 15-17 October 1984. "Sinkholes: Their Geology, Engineering and Environmental Impact. Edited by Barry F. Beck of the Florida Sinkhole Research Institute, University of Central Florida, Orlando. Page 311 - 318. Taylor & Francis, London, UK. Offprint, 1984-10-17) Book, Paul R; Alexander Jr., E. Calvin
    In April 1976, a series of karst sinkholes opened in the holding lagoon of the Altura, Minnesota Waste Treatment Facility. This major failure was preceded by minor sinkhole formation during the construction of the facility in 1974. Subsequent detailed field mapping of the region around the community revealed at least 23 sinkholes not shown on existing maps. The distribution of the sinkholes as well as post-failure investigations of the lagoon indicate that catastrophic collapse is related to the presence of a thin, poorly indurated, jointed sandstone overlying a thick carbonate unit. The sandstone served to collect solutionally aggressive vadose water and to concentrate that water onto specific areas of the underlying carbonate. The resulting differential solution produced voids into which the overlying materials collapsed.
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    Altura, MN Waste Treatment Lagoon Failures: A Hydrogeologic Study
    (1984-02) Book, Paul R; Alexander Jr., E. Calvin
    In April 1976, a series of karat sinkholes opened in the holding lagoon of the Altura MN Waste Treatment Facility. Subsequent detailed field mapping of the region around the community revealed at least 22 sinkholes not shown on existing maps. The distribution of the sinkholes as well as post-failure investigations of the lagoon indicate that catastrophic collapse is related to the presence of a thin, poorly indurated, jointed sandstone overlying a thick carbonate unit. The sandstone served to collect solutionally aggressive vadose water and to concentrate that water onto specific areas of the underlying carbonate. The resulting differential solution produced voids into which the overlying materials collapsed. The disabled facility has been diverting partially treated effluent into a nearby dry run since the lagoon collapsed. A dye trace documented that the effluent after sinking underground reemerges from three local springs and then flows into a river which is a regional trout fishery. However, a second dye trace from the sinkhole in the lagoon failed to establish a connection to any local well or spring.
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    Data for Quaternary ammonium compounds (QACs) in wastewater influent and effluent collected throughout the COVID-19 pandemic
    (2024-01-08) Mahony, Anna K; McNamara, Patrick J; Arnold, William A; mahon445@umn.edu; Mahony, Anna K; University of Minnesota Environmental Engineering Arnold Lab
    The dataset contains the concentrations of quaternary ammonium compounds detected in influent and effluent wastewater, as well as absolute recoveries of QACs spiked into influents and effluents, and absolute recoveries of isotopically labeled surrogate standards, spiked into all samples. After extraction from wastewater, samples are analyzed on a liquid chromatography tandem mass spectrometry (LC-MS/MS), specifically a triple quadrupole mass spec. Raw data from this instrument is provided as well, in the "Raw QQQ data" tab.
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    Development of a Mathematical Model to Predict the Role of Surface Runoff and Groundwater Flow in Overfertilization of Surface Waters
    (Water Resources Research Center, University of Minnesota, 1971-06) Johnson, Jack D.; Straub, Conrad P.
    A nutrient enrichment accounting mathematical model was devised for the New Prague watershed in Minnesota. The New Prague watershed is 23.3 square miles in area and is predominately a rural watershed. Model input data was collected over a 2 1/2 year period from a stream gauging station and two automatic sampling stations. Over 800 water samples were analyzed. Extensive effort was placed on better understanding the nitrogen and phosphorus cycles. It is evident that the spring runoff process and accumulative winter fertilizer applications constitute the major portion of diffuse sources of nutrients in the watershed. Point sources from feedlots and municipal and industrial effluents contribute only 11 percent of the annual EN (total nitrogen, four components) and 7 percent TP (total phosphorus). Disperse sources accounted for 89 percent of EN and 93 percent of TP, with spring runoff in the two months of March and April accounting for 79 percent of the annual EN and 64 percent of the TP. The nutrient output from the watershed could be decreased by increasing penetration of the large amounts of EN and TP in snowpacks into the soil through land terracing to restart rapid spring runoffs and sub-surface drains to allow rapid drainage during the crop season.