Overview and details of the sessions of this conference. Please select a date or location to show only sessions at that day or location. Please select a single session for detailed view (with abstracts and downloads if available).
Session Chair: Anthony Tartaglione, Black and Veatch;
3:00pm - 3:45pm
Pure Water Monterey: Northern California’s First Indirect Potable Reuse Project
Alex Page, Todd Reynolds, David Seymour
Monterey One Water Agency (M1W) and Monterey Peninsula Water Management District have partnered to create Pure Water Monterey (PWM), a $110M groundwater replenishment project. This unique indirect potable reuse project utilizes different sources of water; including municipal wastewater, impaired agricultural drainage, food processing wastewater, surface water and storm water runoff. Purified water will be used to recharge the Seaside Groundwater Basin and create a pathway to a sustainable water supply. The social, environmental and economic benefits of this project are significant, and go well beyond the primary objective of creating over 3,500 acre-feet per year of new potable water supply.
The 5-MGD Advanced Water Purification Facility (AWPF) is designed for future expansion and the treatment processes include ozone pre-oxidation, microfiltration, reverse osmosis, UV advanced oxidation, and post-treatment stabilization processes. The purified water will be pumped from the AWPF site to a conveyance system and a well injection field located about 10 miles away. The water in the aquifer combines with the local groundwater and is withdrawn by existing groundwater wells.
The AWPF is currently under construction and scheduled to startup in Fall 2019. This presentation provides an overview of the PWM project and focuses on how the various elements of the AWPF operate together to meet the water quality objectives. Attendees can expect to get a first-hand look at what it is like to take a full-scale Advanced Water Purification Facility from paper to dirt! We will cover key design features of the AWPF, that Kennedy Jenks and the project team designed to not only produce high quality water, but to have features that would allow for easier construction, start-up, and maintenance. This presentation provides an opportunity to hear about Northern California's first indirect potable reuse project and about the future of water!
3:45pm - 4:30pm
Peracetic Acid Disinfection Of Wastewater Including Class A Reclaimed Water
Scott Weirich1, Meghan Feuk2
1Parametrix; 2LOTT Clean Water Alliance; ,
There is growing interest in disinfection of municipal wastewater with peracetic acid. Its advantages include safety comparable to hypochlorite, no need for dechlorination, no concern about nitrite lock, and disinfection in short contact times. However, its potential disadvantages include rapid degradation once added to wastewater, potential increases in effluent BOD, and incompatibility with chlorine disinfectants.
The Budd Inlet Treatment Plant (BITP), owned and operated by the LOTT Clean Water Alliance, will install a temporary disinfection system in April, 2019 using peracetic acid in order to provide disinfection during a separate ultraviolet system disinfection upgrade construction project. This presentation will present lessons learned in the design, implementation, and operation of the temporary system and in particular the strategy used to combine peracetic acid effluent disinfection with operation of an on-site Class A reclaimed water facility.
A portion of effluent from the BITP is diverted to the reclaimed water facility where hypochlorite is required for disinfection and to provide a residual in the distribution system. The interactions between peracetic acid and hypochlorite have not been well studied, but the chemicals are believed to neutralize each other. Through significant laboratory testing, LOTT measured this effect in BITP effluent and developed a procedure for adjusting the operation of the reclaimed water plant to account for the effects of peracetic acid.
Other challenges faced included limited contact time during high flow periods and very low effluent BOD permit limits. Significant laboratory testing was conducted to estimate the effects peracetic acid which indicated that it will be an effective disinfectant at contact times as low as 9 minutes. Additionally, the testing revealed different formulations of peracetic acid have different impacts on effluent BOD. Important factors to consider are the percentage of stabilizing components of the supplied peracetic acid including hydrogen peroxide and acetic acid.
4:30pm - 5:15pm
Evaluation of Compressible Media and Cloth Disk Filtration Technologies for Unrestricted Reuse
Onder Caliskaner1, Zoe Wu1, Jessica Hazard1, Bill Kunzman2, Terry Reid3, Eric Lawrance4
1Kennedy/Jenks Consultants, United States of America; 2Schreiber, LLC; 3Aqua-Aerobics Systems, Inc.; 4WesTech, Inc.;
The California Water Resources Control Board (State Board), Division of Drinking Water (DDW) requires tertiary treated wastewater to meet certain effluent turbidity limits, as set forth by the California Water Recycling Criteria (Title 22, Sec. 60320.5). Filtration technologies must be demonstrated to meet performance requirement to gain Title 22 approval. Evaluation and testing results from the following three filtration technology demonstration and Title 22 approval projects will be included in this presentation:
1) A tertiary filtration pilot and evaluation study was conducted to assess the performance of a new type of filter medium for the compressible medium filtration (CMF) technology also known as the “Fuzzy Filter”. The pilot study was conducted at the City of Roseville’s Pleasant Grove (Roseville) Wastewater Treatment Plant (WWTP) from April 12, 2010 through July 8, 2010. The performance of the new Fuzzy Filter medium was evaluated, and Title 22 approval was obtained at filtration rate of 40 gpm/ft2.
2) The purpose of this project was to evaluate three cloth media disk filters at higher filtration rates. Each of the three cloths have previously obtained Title 22 acceptance, but at filtration rates of 6 to 7 gpm/ft2. The objective of this testing was to revisit the performance attributes of these media to seek a practical limit of hydraulic capacity while remaining compliant with Title 22 requirements. The cloths which are subject to this peak-capacity testing included OptiFiber PA-13, PES-13, and PES-14. A single disk filter system was installed and commissioned to treat secondary effluent generated at the Roseville WWTP. Testing and monitoring was conducted from January 28, 2016 until April 27, 2016. This study demonstrated the filtration performance of the cloth media filtration technology in accordance with Title 22 water reuse criteria and approval was obtained at flow rate of 22 gpm/ft2.
3) Another CMF technology, FlexFilter, was evaluated for Title 22 compliance at the Linda County Water District WWTP. Pilot filtration project was conducted between August 2018 and January 2019. This project demonstrated the performance of the FlexFilter technology in accordance with Title 22 water reuse criteria at a filtration rate of 12 gpm/ft2.