The Oxnard advanced water purification facility: Combining indirect potable reuse with reverse osmosis concentrate beneficial use to ensure a California community's water sustainability and provide coastal wetlands restoration
Lozier J.,CH2M HILL |
Ortega K.,City of Oxnard
Water Science and Technology | Year: 2010
The City of Oxnard in California is implementing a strategic water resources program known as the Groundwater Recovery Enhancement and Treatment (GREAT) program, which includes an Advanced Water Purification Facility (AWPF) that will use a major portion of the secondary effluent from the City's existing Water Pollution Control Facility to produce high-quality treated water to be used for irrigation of edible food crops, landscape irrigation, injection into the groundwater basin to form a barrier to seawater intrusion, and other industrial uses. The AWPF, currently under design by CH2M HILL, will employ a multiple-barrier treatment train consisting of microfiltration, reverse osmosis, and ultravioletlightbased advanced oxidation processes to purify the secondary effluent to conform to California Department of Public Health Title 22 Recycled Water Criteria for groundwater recharge. The AWPF, which will have initial and build-out capacities of ca. 24,000 and ca 95,000m3/day, respectively, was limited to a 1.8-hectare site, with 0.4 hectares dedicated to a Visitor's Center and administration building. Further, the depth below grade and height of the AWPF's structures were constrained because of the high groundwater table at the site, the high cost of excavation and dewatering, and local codes. To accommodate these various restrictions, an innovative design approach has been developed. This paper summarizes the design constraints and innovative solutions for the design of the AWPF. © IWA Publishing 2010.
News Article | February 15, 2017
PRECO Electronics, the global leader in heavy-duty vehicle collision mitigation, today announced the 2016 Safety in Motion Award recipients as Solid Waste Association of North America’s (SWANA) David Biderman and City of Oxnard Environmental Resources Division’s George Van Hemert. Both recipients have continually demonstrated their unparalleled commitment to safety to distinguish themselves as leaders in safety. The 2016 Safety in Motion Award also recognized Clint McGinty of Phoenix Services and James Zertuche of NAPCO Precast as finalists for this year’s award. Both runners-up continue to drive safety within their companies and industries. PRECO congratulates them on their nominations and recognition for being finalists for the 2016 Safety in Motion Award “We have made safety a core value at SWANA over the past year, and I am pleased to accept this award. Nothing we do at SWANA is more important than making sure the hard-working men and women in the waste industry, in both the United States and Canada, go home to their families safely at the end of each day,” said Biderman, Executive Director and CEO. “We have had great success at the local level through our new Safety Ambassador program in our chapters, and other SWANA safety initiatives. This heightened level of awareness is encouraging new technology and best practices that positively impact safety performance in the waste and recycling industry.” “The waste and recycling industry is one of the most dangerous industries because of its close interactions between heavy-duty machinery and individuals,” said Van Hemert, Health & Safety Supervisor. “I am proud to receive the 2016 Safety in Motion Award and to be recognized as a safety leader in the City of Oxnard and the waste and recycling industry.” Biderman’s continual promotion of safety has allowed him to be recognized as an industry safety thought leader. His actions have led to companies and local governments adopting the most effective safety practices in order to reduce the incidences and severity of heavy-duty vehicle accidents. Van Hemert’s proactive safety measures are reflected by the reduction of Workers' Comp injuries to the lowest level on record for his division as recorded by AIMS Insurance. City of Oxnard Environmental Resources Division’s Indemnity costs were lower than any other company of similar size and industry in Southern California. Van Hemert attributes this to identifying and deploying best in class safety technology and practices. “The record number of applicants for this year’s award illustrates the importance that today’s fleets and heavy-duty leaders are placing on deploying safety in everyday practices,” said Matt Wood, vice president of sales at PRECO. “As a leader within our market, PRECO has the opportunity to recognize organizations and individuals that are taking the initiative to enhance safety awareness within their industries. This year’s awardees understand the benefits of being proactive in their adoption of safety practices, with the ultimate goal of reducing avoidable accidents and saving lives.” About the Safety in Motion Award PRECO’s commitment to heavy-duty vehicle safety has continued to move safety forward. As a safety leader, Preco identifies and honors other professionals who also keep safety moving forward in their companies, communities, and industries. PRECO Electronics established the Safety in Motion Award to honor one person each year who is the voice of safety in their industry. The award criteria includes: Initiative: The ideal candidate will initiate candid discussions, programs (corporate, community, or industry), and/or give voice to safety issues in the industry or community. Imagination: The ideal candidate will demonstrate creative and original suggestions to move safety into the forefront of the community, legislature, company or industry they serve. Involvement: The ideal candidate will take an active role in industry associations, community safety programs, and/or corporate/legislative policy changes to advance safety. About PRECO Electronics PRECO is the global leader of collision mitigation solutions for heavy-duty equipment industries. PRECO believes that those responsible for heavy-duty equipment operations have a desire to keep the people and property around them safe and free from harm. We design, engineer and manufacture collision mitigation technology optimized for heavy-duty equipment. Our safety products have survived the industry’s most rigorous testing for unstoppable performance in the harshest working conditions imaginable, so operators and fleets can perform with greater confidence and peace of mind. Established in 1947, PRECO has been providing safety solutions to heavy-duty industries for almost 70 years. Learn more at http://www.PRECO.com and follow us on Twitter @PrecoElec.
Chakraborti R.K.,CH2M |
Bays J.S.,CH2M |
Ng T.,City of Oxnard |
Balderrama L.,City of Oxnard |
Kirsch T.,City of Oxnard
Water Science and Technology | Year: 2015
A pilot study was conducted for 7 months for the City of Oxnard, California, on the use of constructed wetlands to treat concentrate produced by microfiltration and reverse osmosis (RO) of reclaimed wastewater. The treatment performance of a transportable subsurface-flow wetland was investigated by monitoring various forms of nitrogen, orthophosphate, oxygen demand, organic carbon, and selenium. Significant mass removal of constituents was measured under two hydraulic residence times (HRTs) (2.5 and 5 days). Inflow and outflow concentrations of nitrate-N and ammonia-N were significantly different for both HRTs, whereas nitrite-N and total organic carbon (TOC) were significantly different during HRT2. Mass removal by the constructed wetland averaged 61% of nitrate-N, 32% of nitrite-N, 42% of ammonia-N, 43% of biochemical oxygen demand, 19% of orthophosphate as P, 18% of TOC and 61% of selenium. Mass removal exceeded concentration reductions through water volume loss through evapotranspiration. Calibrated first-order area-based removal rates were consistent with literature ranges, and were greater during HRT1 consistent with greater mass loads, higher hydraulic loading and shorter HRTs. The rate constants may provide a basis for sizing a full-scale wetland receiving a similar quality of water. The results indicated that engineered wetlands can be useful in the management of RO membrane concentrate for reclaimed water reuse. © IWA Publishing 2015 Water.
Franks R.N.,Hydranautics Nitto Denko |
Bartels C.R.,Hydranautics Nitto Denko |
Birch D.,City of Oxnard
AWWA/AMTA Membrane Technology Conference and Exposition 2012 | Year: 2012
In November 2008, the City of Oxnard, located sixty miles northwest of Los Angeles, commissioned its first, large scale, brackish water reverse osmosis (BWRO) desalination water treatment facility as part of its comprehensive regional water resources development program. The uniquely designed RO uses energy saving technologies in a hybrid configuration to minimize power consumption. The 7.5 MGD (28,400 m3/day) RO has been operating stably for three years and affords the opportunity to compare the tradeoff between its original capital cost and its operating cost based on actual performance data. Downstream cartridge filtration, the two stage BWRO system treats ground water with an average salinity expressed in TDS of 1,500 mg/l and a temperature ranging between 18°C and 25°C. The plant employs a hybrid design by using two different RO membranes with differing permeabilities and rejections in each of the two stages. Contrary to a typical hybrid design, the Oxnard inverts the membrane installation by placing the higher permeability membranes in the first stage while higher rejecting membranes improve the permeate quality coming from the second stage. The flux imbalance that would normally occur in such an reversed hybrid is offset by the presence of an Energy Recovery Device (ERD) between the two stages. This leads to a more equitable flux throughout the system. The selection of an ERD increased the capital cost of the plant. However, the use of a hybrid design in combination with the ERD, offers operational cost savings relative to a more conventional, lower capital, system. Placing the higher rejecting membranes in the second stage where they are needed most means that the overall permeability of the plant is lower than if the higher rejecting membranes had been located in the first stage. The operational savings associated with this unique membrane combination offsets the higher capital cost of the ERD which makes the design preferable both economically and technically. This paper evaluates the capital and operating cost associated with the reversed hybrid design and compares the Oxnard design to other Brackish RO designs including a similar design that takes advantages of the latest RO membrane chemistry as well as manufacturing developments that were not available when Oxnard was commissioned in 2008. The evaluation is based on actual operating data spanning the past three years, including actual feed and permeates water ion analysis. The difference in operating cost will be compared to the differences in capital cost, and a 2 year return on investment will be shown. The technical and economic evaluation of the system, based on three years of operating data, illustrates the use of an innovative design employing the latest energy saving technologies to reduce energy consumption and operating costs. This evaluation can be used to design an RO system and evaluate the tradeoff between capital cost and operating cost, while seeking to tailor the element selection to meet specific permeate quality targets. © 2012 American Water Works Association.