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open access

Evaluation of a Constructed Wetland to Reduce Toxicity from Diazinon at the Pecan Creek Wastewater Treatment Plant, Denton, TX

Description: The City of Denton Pecan Creek Wastewater Treatment Facility has periodically failed effluent toxicity testing. A Toxicity Identification Evaluation has determined that Diazinon in the effluent is contributing to the observed toxicity. Chlorpyrifos is also implicated as a factor. The City of Denton constructed a half acre experimental wetland to remove Diazinon related toxicity. Results from spiking and microcosm experiments indicate that the wetland can reduce the Diazinon.
Date: May 1996
Creator: Baerenklau, Amy L. (Amy Lyn)
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Macroinvertebrate Community Structure as an Indicator of Watershed Health in the Upper Trinity River Basin, North Central Texas

Description: This study describes macroinvertebrate community structure and assesses its potential in detecting point and non-point sources of disturbance associated with rural and urban areas in the Upper Trinity River Basin. Geospatial techniques were used to quantify landuse within the watershed in a GIS. At rural sites near the headwaters of the Trinity River, collector-gathering burrowers that are adapted to minimal flow comprised the majority of taxa. Destinies of taxa compositions at downstream sites… more
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Date: May 2000
Creator: Stephenson, Jaynie M.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Microbiological Treatment of Wastewater from a Wood-Preserving Plant

Description: This research investigates interacting biological, chemical, and physical factors affecting the efficiency of microbiological wastewater treatment at the W. J. Smith Wood- Preserving Company in Denison, Texas. The treatment process consisted of collecting exhaust boiler water containing unidentified boiler treatment compounds, steam condensate contaminated with preservatives and wood extracts, plant process waters, and rainfall runoff from plant grounds. With a 5-minute residence time, wastewat… more
Date: August 1974
Creator: Ralston, James R.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

A Quantitative and Qualitative Bacterial Analysis of the Sewage Disposal System of Perryton, Texas

Description: This investigation had for its purpose the determination of first, the inefficiency of the Perryton, Texas, sewage disposal plant proper; and second the potential effectiveness of a lagoon now used to complete the sewage purification; and consequently, offset an apparent health hazard. The problem, as pursued, has consisted of first, the collection of sewage samples from the six stations listed in Table 1 over the period of time from September 23, 1949 to May 14, 1950; second, a quantitative an… more
Date: August 1950
Creator: Sullivan, Troy G.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Quantitative Aspects of the Microflora of an Overland Flow Spray Irrigation Sewage Disposal System

Description: It was the purpose of this investigation to attempt to quantitate the microflora of the fields which receive the effluent from the Campbell Soup Plant, Paris, Texas, and to determine whether or not there is a correlation between the numbers and types of organisms present and the efficiency of purification of the system.
Date: May 1969
Creator: Jones, Rebecca
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Factors Affecting Slime Formation in a Spray Irrigation Waste Disposal System

Description: It was the purpose of this investigation to determine (1) what organisms are associated with the formation of this slime layer, (2) if certain chemical factors in the environment either enhance or retard formation of the slime layer, (3) whether or not there are certain chemical factors which are detrimental to slime formation, yet not detrimental to purification, or that perhaps enhance purification, (4) whether or not there are chemical factors which enhance purification of the effluent witho… more
Date: August 1970
Creator: Jorgensen, James H.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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