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A bi-monthly magazine covering the environmental protection and drinking water industry since 1988

September 2002 Edition Blue Gold - a dismal litany of global water tragedies It was Malthus who first predicted that growing human populations would inevitably result in humankind becoming unable to feed itself, and so invested economics with the taint: The Dismal Science. In 2002, the book Blue Gold is similarly pessimistic but outlines a litany of tainted rivers, dried out aquifers and polluted lakes, as an even bigger threat to mankind than food shortages. History, however, shows that war has remained the largest and most consistent obstacle to providing food and water for the human race. See Tom's full commentary Also in this issue: Industry News Simplot Canada goes back to the future Advanced automation comes to the precast concrete industry Nanofilters convert river flow into safe drinking water Irrigation incentive study reduced peak-period demand 26% Microfiltration to stop seawater intrusion Carbon dioxide sea injection trials cancelled Why sustainable drainage is urgently needed Fossil tests now show that computers have underestimated climate change Satellites can peer underground to monitor aquifer levels The facts behind lubrication problems in wastewater treatment plants Radium-226 monitoring for new metal mining effluent regulations Aquaculture and energy-generation benefit from pipeline deep under the sea The design/build process for water and wastewater infrastructure construction Remote monitoring for wastewater sites Nova Scotia town chooses geosynthetic floating covers Understanding requirements of ISO/IEC 17025 Historic St. John's harbour undergoes phased approach in clean-up project

Waveguide solves digester level monitoring dilemma for Orillia plant The city of Orillia, Ontario, located north of Toronto, has found a reliable level measurement system for the two anaerobic digesters at its wastewater treatment centre. This facility features five primary and five secondary clarifiers, as well as six aeration basins, servicing a flow of six million gallons a day via 21 pumping stations. The level in an anaerobic digester is a critical measurement. If the top foam level gets too high, it can enter the gas collection pipeline and lead to costly maintenance. In extreme cases, pressure can lift the roof off the vessel. Gas may escape, harming staff and the environment. Click here to see the full article. Equipment Specifiers' Guide Spotlight On: Analytical Equipment Quick-Link: print edition advertisers Comments? send them to the editor.

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