The expansion of the Sweeney Water Treatment Plant in Wilmington is nearing complete. Planning for the project began in 2005. The construction will take the plant from 25 million gallons of treated water per day to a potential 44 million gallons per day. The facility is implementing new filtration systems, including ozone and UV disinfection. The plant draws water from the Cape Fear river. All construction was done while still keeping the plant fully-operational. It is scheduled to open next April.
The expansion is designed to meet the needs of the served community as it continues to grow while also conforming to new regulations for drinking water. Many communities are updating their treatment facilities to meet regulations dealing with disinfection byproducts (DBP) and enhanced disinfection. Ozone and UV are proven technologies to manage DBP.
Parsons was selected by the Orange County Water District (OCWD) to provide construction management services for the $128 million Initial Expansion of the Groundwater Replenishment System (GWRS) in Fountain Valley, CA.
Scheduled for completion in 2014, this project will increase the treatment capacity of the GWRS by 31,000 acre-feet per year. GWRS, the largest advanced water treatment facility of its kind in the world, takes highly treated wastewater and purifies it through membrane filtration, reverse osmosis, and advanced oxidation using ultraviolet light (UV) and hydrogen peroxide. Advanced oxidation processes like UV/peroxide produce a powerful oxidizing compound called the hydroxyl radical. Hydroxyl radicals are capable of destroying virtually all organic compounds found in water including dangerous micro pollutants from pharmaceuticals, personal care products and pesticides that may not be removed by other treatment processes.
This highly purified water will be percolated into OCWD’s groundwater basin to supplement its drinking water supplies as well as to augment the seawater intrusion barrier, which prevents seawater from contaminating the groundwater. The GWRS has a secondary benefit of reducing the amount of treated wastewater discharged to the Pacific Ocean off the coast of Huntington Beach.
To meet new federal regulations aimed at reducing gastrointestinal illness from Giardia and Cryptosporidium microbes, the Marlborough plant will use ultraviolet light. The combination of treatments will allow for a reduction in the amount of ozone that is added to the water, which in turn will reduce our ozone operating expenses to offset increased operating expenses for the UV disinfection. The result will be two means of primary disinfection, but operating costs won’t increase significantly. The use of multiple barrier to further reduce risk from pathogens and decrease disinfection byproducts is a growing trend in the public drinking water systems.
The 20th World Congress and Exhibition of the International Ozone and International UV Associations is to be held May 23-27 in Paris, France. The technical program has been prepared and will include presentation on Advanced Oxidation, Ozone and UV reactor Design, Industrial Applications of Ozone and UV, Ozone in Agrifood, Ozone and UV Reaction Modeling, Wastewater Treatment, and Aquatics. Over 300 full and poster presentations are planned with presenters from around the world presenting. In addition to the papers, the world’s leading suppliers of ozone generators, UV reactors and related equipment and instruments will be found at the exhibition. Information on the conference can be found at www.io3a.org.
IWA has published a new book International Ozone Association members Clemens von Sonntag and Urs von Gunten. The book will discuss the details of ozone reactions as they relate to micropollutant ( pharmaceuticals, pesticides, fuel additives, solvents, taste and odor compounds, and cyanotoxins) degradation. The book will be useful for those doing research or planning for ozone treatment in drinking water and wastewater treatment. The 320 page book will be available in October of 2011 and will cost $162.00 from IWA.