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Building a Nutrient Mass Balance Model for Utah Lake

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Monday, December 6, 2021 3 pm

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This is a past event.

This is a joint EPSSI/Environmental Engineering Graduate Seminar
Weihong Wang, Associate Professor, Department of Earth Science, Utah Valley University


Harmful algal blooms (HABs) are a common problem for water bodies that affects aquatic life, community health, and recreation. Excessive phosphorus (P) and nitrogen (N) input to aquatic ecosystems often cause HABs. Utah Lake, one of largest freshwater lakes in the western United States, experiences seasonal HABs. Utah Lake is considered hypereutrophic due to nutrient input from agricultural and stormwater runoff, atmospheric deposition (precipitation and dust), effluent from wastewater treatment plants (WWTPs), etc. This research focused on the nutrient loads from eighteen sites (both upstream and downstream) of ten Utah Lake tributaries and seven WWTPs. Water samples were tested over a six-week period using a CheMetrics V-2000 Photometer to determine the concentrations (mg/L) of four inorganic compounds: orthophosphate (PO43-), nitrate (NO3-), nitrite (NO2-), and ammonia (NH3). A YSIDSS Pro water quality meter was used to measure other water parameters (pH, chlorophyll a, phycocyanin, etc.). Our data showed temporal and spatial variations in nutrient concentrations. Downstream river sites had higher 6-week average concentrations (NH3: 0.87, NO3-: 3.28, NO2-: 0.15, and PO43-: 1.41) than the upstream sites (NH3: 0.09, NO3-: 0.62, NO2- :0.04, and PO43-: 0.23) for all tributaries. The WWTPs had much higher average concentrations when compared to the tributaries (NH3:2.10, NO3-: 42.11, NO2-: 0.33, and PO43-: 6.50). A limit for P was set at 1 mg/L for the WWTPs on January 1st, 2020, by the Utah Division of Water Quality. Based on our data five of the seven WWTPs exceeded this limit but were allowed because of individual extensions. Each WWTP has their own limit for NH3 which they all complied to. However, there is no limit for NO3- and NO2- at the WWTPs. Our results indicated that the failure to abide by the P limit and a lack of limits on total inorganic nitrogen could have resulted in much higher nutrient input to Utah Lake from the WWTPs than previously thought. To minimize HABs, a stricter nutrient standard should be placed on the effluent from the WWTPs, which could be achieved by investment in wastewater treatment technology. Also, improved farming practices (such as crop rotation and efficient irrigation techniques) could help decrease nutrient runoff from agricultural land into the tributaries and the lake.


Dr. Weihong Wang is an Associate Professor in the Department of Earth Science at Utah Valley University. She graduated with a Ph.D.

degree in Marine Science from the University of South Carolina. Her research interests include anthropogenic impact on wetland ecosystems, GIS and Remote Sensing applications, and Energy Use and Sustainability. Her current research is focusing on nutrient loading to Utah Lake and land use land cover classification within the Utah Lake Watershed using GIS-remote sensing techniques.


Recorded Presentation: Passcode: +fSaA8@J

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Angela Keranen is inviting you to a scheduled Zoom meeting. 

Topic: Environmental Engineering Graduate Seminar
Time: Dec 6, 2021 03:00 PM Eastern Time (US and Canada)

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