Wastewater as a Point-Source of Priority Contaminants in the Arctic: A Case Study in Cambridge Bay, Nunavut

The Cambridge Bay wastewater system is comprised of a wastewater lagoon, formerly a series of natural lakes, which perform primary treatment, and is discharged once a year (mid-summer; typically during July-August) into a small hydrologically-isolated natural tundra wetland. Wastewater is then released through an open channel into the marine environment (Cambridge Bay). Measurements were done pre-, during, and post-release of wastewater in the wastewater treatment facility and receiving environments, plus reference sites. Sampling sites were located at the lagoon, wetland site, outfall site, marine reference site, and freshwater reference sites. Specific data types are below.

Mercury: Total mercury (HgT) and total methylated mercury (MeHgT, sum of mono- and di-methyl-mercury) was measured pre-, during, and post-release in the lagoon, wetland site, outfall site, marine reference site, and freshwater reference sites along with nutrients (total nitrogen (TN) and phosphorous (TP)) and total organic carbon (TOC). Grab sampling was utilized for this aspect of the project. Single nutrient and carbon samples were taken at each sampling event, while HgT and MeHgT were sampled in triplicate.

Microplastics: Depending on the site, microplastics sampling was either be conducted using a manta trawl or a small zooplankton-like dip net. Nets were towed across the water’s surface, alongside a boat at set speed for designated tow times (ca. 15 minutes). Given the logistical nature of trawl sampling for microplastics, triplicate samples are not the norm. Samples are digested using a wet peroxide oxidation previously used in our lab and enumerated by microplastic type (fibre, film, foam, fragment, bead) under a microscope.

PFAS: Grab samples were collected in the lagoon, wetland site, outfall site, marine reference site, freshwater reference site, and an additional site at the airport. Samples were analyzed using an already validated method for 16 various PFAS compounds including older long-chain compounds (i.e. PFOS and PFOA) and more recent, shorter chain versions (e.g. perfluoro-butanesulfonate PFBS).

Identifier
Source https://www.polardata.ca/pdcsearch/PDCSearchDOI.jsp?doi_id=13075
Metadata Access http://www.polardata.ca/oai/provider?verb=GetRecord&metadataPrefix=fgdc&identifier=13075_fgdc
Provenance
Creator Wong, Charles; Stroski, Kevin; Challis, Jonathan; Chaves-Barquero, Luis
Publisher Canadian Cryospheric Information Network
Contributor Polar Data Catalogue
Publication Year 2019
Rights Research programs, CCIN, or ArcticNet take no liability for the use or transmission of this data
OpenAccess true
Contact wong.charles.shiu(at)alum.mit.edu; pdc(at)uwaterloo.ca
Representation
Language English
Format Computer file
Discipline Environmental Research
Spatial Coverage (-105.000W, 69.000S, -104.000E, 69.000N)
Temporal Coverage Begin 2018-07-01T00:00:00Z
Temporal Coverage End 2018-09-12T00:00:00Z