The Diemer Water Treatment Plant in Yorba Linda shut down for a week to prepare for new equipment. The shutdown will allow crews to upgrade the plant so that it can use ozone as the water’s primary disinfectant, rather than chlorine compounds. Substituting ozone for chlorine compounds as the primary disinfectant reduces the potential for the formation of disinfection byproducts such as trihalomethanes and haloacetic acids that are considered unsafe for human consumption by the US EPA. The work is expected to be completed next year.
The Diemer plant supplies nearly half of Orange County’s water. The plant can treat up to 520 million gallons of drinking water per day, enough for 3 million residents of Orange and Los Angeles counties. The plant generally pulls water from Northern California or the Colorado River.
The city of Anaheim, California has awarded a municipal water reuse system contract for a demonstration facility that will supply reclaimed water for toilet flushing, irrigation, and recreational use. The project is the first ozone-based technology to be accepted by the California Department of Public Health. Ozone is widely used in a variety of water treatment applications including wastewater treatment, drinking water treatment, bottled water, etc. Application of ozone water treatment methods for reclaiming wastewater and other water sources is growing in acceptance.
According to a recent study by the Freedonia Group, worldwide demand for water disinfection products is projected to grow more than 7% annually through 2014. UV and ozone are expected to grow the fastest. Regulations developed in the US and elsewhere to reduce the threats posed by disinfection byproducts have created opportunities for newer technologies such as chloramines, UV and ozone.
Non chemical technologies are expected to register faster growth, in part because many of these technologies offer a more sustainable option relative to products such as chlorine gas or bleach. Ozone offers the favorable attributes of degrading into safe compounds. It is also very effective for taste, odor and color removal.
McCarthy Building Companies has started work on a project for North Texas Municipal Water District, constructing new ozone facilities for the existing water treatment plant in Wylie, Texas. The $112-million project will include the installation of ozone generation equipment and construction of two buildings to house this equipment. McCarthy will also install liquid oxygen storage and feed equipment, which will supply oxygen for ozone generation.
The ozone water treatment process reduces disinfection byproducts as well as taste and odor compounds. As part of the project, McCarthy will construct 11 ozone contactors and install side stream injection systems, ozone-quenching and filter backwash chemical feed systems.
The current water treatment facility has a capacity to treat 770-million gallons of water per day and serves more than 1.6 million residents in North Texas. The engineer on the project is Black and Veatch of Dallas. The project is scheduled for completion in January 2014.