May 19, 2015

Innovating for Success: Selenium Management

Agenda

1 Selenium

3 Phase II: Selenium Mass-Balance Model

4 Research and Innovation at Stantec

2 Phase I: Volatilization

Selenium1

Selenium Biogeochemistry

Modified from Herbel et al. 2002

Examples of Selenium

Volatilization

• 17-61% loss of Se from the surface

water in constructed wetlands

attributed to volatilization

• 1455 kg Se/year lost from Great Salt

Lake via volatilization

Ye et al., 2003; Lin and Terry, 2003, Hansen et al. 1998; Johnson et al. 2009, Diaz et al. 2009)

Phase I: Volatilization2

The Power of Volatilization

• Dissolved volatile

Se: 3.7 ng/L

• Translates to 16 to

25% of the

maximum yearly

Se load removed

via volatilization

Dicaltado et al. 2000, Diaz et al. 2009

The Cryo-Trap: Capturing

Selenium

Modified Diaz et al. 2009

Translating

Volatile

Selenium Flux• Annual loss of Se

(kg/year) from the system

• Seasonality of Se volatilization

Phase II: Selenium Mass

Balance

3

Selenium Mass Balance Model

Modified Diaz et al. 2009

Selenium

Input

Selenium

Output

Integrating

Wetlands

Maximizingselenium removal

while protecting

the environment

Research and Innovation

at Stantec4

• Selenium toxicology:

amphibians

• Cost-effective selenium

treatment plants in a

variety of environments

• Arsenic speciation

• Otolith laser ablation

• Laser induced breakdown

spectroscopy

• DNA barcoding

• Non-lethal gene

expression analysis

Missiyh!