The Mazzei Injector Company has announced that its unique Pipeline Flash Reactor™ for ozone contacting was selected and installed by the Castaic Lake Water Agency. The water agency’s facilities include the Earl Schmidt Filtration Plant and the Rio Vista Water Treatment Plant. The plants treat Castaic Lake water supplied from the California State Water Project. Both plants recently underwent major expansion to increase capacity.
As part of the expansion of the Rio Vista Plant an alternative filtration treatment process was converted to an ozone contactor. The Mazzei Flash Reactor was selected for the ozone side stream injection because of its high efficiency and small footprint.
The 102″ Pipeline Flash Reactor™ uses application specific Mazzei nozzles to introduce the water/ozone side stream flow back into the main water flow at high velocities. This causes a section of the system to be a turbulent mixing chamber without the pressure loss of conventional mixing systems. Ozone mass transfer occurs within a few seconds and thoroughly mixes with the main pipe flow.
Spartan Environmental Technologies distributes Mazzei ozone water mixing products including venturi and nozzles.
Global engineering and construction company Black & Veatch has confirmed that it will be part of the Eastern Tertiary Alliance that will deliver the Tertiary Upgrade of the Eastern Treatment Plant in Melbourne, Victoria, Australia, the largest activated sludge plant in the country.
The A$380 million upgrade will greatly improve the quality of treated effluent discharged into the Bass Strait with resulting benefits for the marine environment.
The upgrade will also open the door to significantly more recycling opportunities over time and make the plant one of the most sophisticated large-scale wastewater treatment facilities in the world.
Black & Veatch were employed by Melbourne Water in 2008 to lead the technology trials that were successfully completed in early 2009. These trials determined that the preferred treatment processes for the upgrade would be ozone and biological media filtration coupled with ultraviolet and chlorine disinfection.
The construction phase will commence soon and is scheduled for completion in 2012.
As a follow-up to the post regarding ozone for taste and odor control in Waco, we can add another success story for ozone in the same application. This time it is Charleston, IL. We have seen a number of towns with ozone water treatment win taste tests contests when the water system previously had problems with taste.
Bad tasting and smelling water were so problematic five years ago for Charleston that they decided to use ozone in the middle of its water treatment process, a first in Illinois. Charleston treats surface water, so it must contend with algae and other water taste challenges not faced by suppliers that use underground water sources.
Five years later, the Charleston Water Treatment Plant has won first place in a water tasting contest held by the regional 15-county Water Supply Operators Association. The plant is now scheduled to represent the region in the Illinois Section of American Water Works Association Conference tasting contest on March 16 in Springfield.
The water samples were judged on taste, odor and clarity. Charleston’s success in the contest can be attributed, in part, to the plant being new and having equipment for treating water with ozone. The plant on east McKinley Avenue converts liquid oxygen into gas and then runs the gas through an ozone generator to turn it into ozone. The ozone, an unstable form of oxygen, is injected into the water to destroy biological compounds that cause bad taste and odor.
Behind the Lake Waco dam is a public-works project with an ambitious mission to provide the Greater Waco, Texas with plentiful, tasteless water for decades to come. When it starts operation in June, the $50 million dissolved air flotation water plant will shoot tiny bubbles through lake water to remove algae that make Waco water have an unpleasant taste. An ozone disinfection process will be added in the fall. The construction project is 76 percent complete.
These processes will remove all detectable traces of geosmin, the natural compound that occasionally gives Waco water its earthy taste. Water quality may be the most noticeable improvement, but the plant also will vastly expand its potential quantity. The plant will send pretreated water to Waco’s two existing water treatment plants — Riverside and Mount Carmel — where it will be prepared for public consumption.
The pretreatment eases the burden on the existing plants. The result will be a 36 percent increase in overall treatment capacity, from 66 million gallons to 90 million gallons per day. That will be enough to meet water-supply projections to about 2030. There is room for a second phase that would expand capacity to more than 130 million gallons.
The Lake Waco algae secrete the most geosmin when they are under stress and begin to die in the long journey to the treatment plant. He said that by removing the organisms just hundreds of feet from the lake intake, the plant is able to eliminate the problem. The algae cells are removed through a series of baffles in huge concrete “cells,” where jets of bubbles force them to the top of the water column and skimmers remove them. The water will then run into stainless steel chambers, where it will be mixed with ozone, a disinfectant that will be manufactured on site using pure oxygen.
The Chemical and Water Security Act, H.R. 2868, now under consideration in the Senate Homeland Security and Governmental Affairs Committee, as well as the Senate Environment and Public Works Committee, establishes a permanent comprehensive program that would require high-hazard chemical plants to review methods to reduce the consequences of a terrorist attack. It would require the very highest hazard facilities to implement such techniques where cost effective, technically feasible, and risk reducing. And also it would provide limited funding for facilities that upgrade to safer, more secure technologies.
These measures would help secure our nation’s chemical facilities and keep Americans safer. And in fact, reports from the Center for American Progress show that many companies already use intrinsically more secure technologies that remove the danger of a major toxic gas release.
Organizations would adopt an alternate chemical or process, use a chemical in a less dangerous or less concentrated form, or generate a chemical only as needed without storage. For water utilities eliminating bulk chlorine gas by using liquid bleach, ozone, and ultraviolet light are good choices. These changes remove unnecessary dangers and avoid certain costs related to regulatory compliance, liability insurance, personal protective equipment, community notification, site security, and emergency planning.