Speaker: Ryan Langlois Department of Experimental Statistics Title: Analysis of a Two-Stage Lagoon Plus Wetland System as a Natural Wastewater Treatment Option Date/Time/Place: "Wednesday, April 23, 2008" "3:30-4:30am; Rm 248 Agricultural Admin. Bldg." Abstract: Dairy waste effluent has been cited as a source of nutrients and coliform bacteria contamination. As a result, all dairies have been required to install single-stage lagoon systems, in an effort to reduce this contamination. These single-stage lagoons were shown to only provide a limited amount of benefit, so researchers were curious of other methods to further increase this effectiveness. In 2003-2004 the LSU-AgCenter constructed a two-stage lagoon system at the Southeast Research Station in Franklinton, Louisiana. SAS Proc Glimmix was used to model the counts of bacteria collected from the wetland water samples over seven sampling dates. A comparison of the different modeling distributions Glimmix can utilize is examined, as well as comparisons to older procedures in SAS. The negative binomial model shows better fit than other distributions in displaying a significant effect of the two-stage lagoon system as a natural wastewater treatment option.
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Time stamp: Wed Apr 23 11:58:23 UTC 2008