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February 2020 Articles
This issue includes ES&E Magazine’s annual Directory and Buyer’s Guide for the water, wastewater and environmental industries. Plus, a special focus on the challenges of water and wastewater treatment, and other environmental issues in cold climates and remote locations.
It is important to monitor the condition of aging asbestos cement watermains
Relying only on thickness measurement may mean condemning pipe prematurely when it still has substantial strength that will allow additional service life.
Report looks to create clear standard for reducing excess I/I for new sewers
A recent report compiles methods that can be applied when sewers are first constructed to limit the risk of leakage, highlighting the need for resilient infrastructure in an age of climate change where extreme rainfall has risen sharply.
Mobile district metered area testing helps cut watermain leak losses
A mobile testing unit designed to accurately and reliably measure minimum night flow into specific sectors of water distribution systems has been assembled, tested and deployed at several locations in York Region and the City of Ottawa.
Finding the right stormwater management system for a mixed-use development in North Vancouver
Stormwater management system project for a large multi-family mixed-use development in North Vancouver's Lynn Valley area finds a durable solution that not only protects the development against flooding, but would also work with the site’s unique, tight and hilly profile.
Protecting a northern mine leachate spillway with concrete canvas
Concrete Canvas® is a new class of construction material called geosynthetic cementitious composite mats. Used for a wide range of erosion control applications, Concrete Canvas has numerous benefits that make it an attractive product.
Lessons learned while replacing aging watermain
City of Vaughan, Ont., and Chisholm, Fleming and Associates maximizes use of trenchless construction to replace two-kilometre section of badly deteriorated watermain.
Northern communities could benefit from renewable energy systems
Program assists Canadian First Nation communities wanting to replace diesel, but cost curves of diesel versus clean energy stack the cards against change for many small and cash-strapped communities.
Cold water nitrification and cyanides removal for mining wastewaters
Laboratory and pilot-plant studies have confirmed that biological nitrification and denitrification could be sustained for mining effluent at very low temperatures (<5 °C)
The search for lower cost water sources in the Arctic
The search continues for technology with lower costs for water systems in the far north, including decentralized wastewater technology and water re-use technology.
Automation helps maintain water tank levels and prevent freezing in colder climates
The two key factors for water storage are to ensure the tank maintains the correct level and that there is water turnover to protect water quality. In colder climates, low tank turnover can lead to water freezing within it.