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).
Location: Room 420A |
|Date: Tuesday, 14/Sept/2021|
|8:00am - 9:30am||Session 13A: WateReuse: Planning & Partnerships|
Location: Room 420A
8:00 am to 8:45 am
Sharon Napier & Ashley Harper
The National Water Reuse Action Plan (WRAP) and what it means for the Pacific Northwest
The National Water Reuse Action Plan (WRAP) adopts a proactive approach to strengthening the security, sustainability, and resilience of our nation’s water resources. It builds on more than four decades of water reuse expertise and promotes a growing collaboration among federal, state, local, and private sector reuse efforts. The first iteration of the WRAP was released in February 2020 and included over 80 partners who reflect a diverse cross section of the water user community.
The WRAP collaborative continues to grow through the addition of new partnerships and actions that address challenges and barriers and fulfill state, tribal, and water sector needs related to water reuse. More than 100 organizations are currently driving progress on over 40 actions across 11 strategic themes (e.g., finance support, policy coordination, integrated research) which demonstrate the meaningful advancements that action leaders and partners have made across the sector. Progress on action implementation is highlighted through the WRAP Online Platform, which promotes transparency and accountability by reflecting the current implementation status for all WRAP actions.
The success of the WRAP is directly tied to contributions and collaborations from members of the water community. Ultimately, the effort seeks to ensure that water reuse is accessible, straightforward to implement, and sensitive to local needs.
This session will focus on WRAP progress that addresses barriers to reuse across a range of topics including technical, institutional, and financial and will demonstrate cross-action collaboration, identify potential gaps, and exemplify the evolving nature of the WRAP. The session will also recognize and highlight the diversity of action leaders and partners and invite involvement from participants.
A standing goal of the WRAP is to enhance and grow partnerships across the water user community to facilitate integrated action and daylight progress and examples of water reuse.
8:45 am to 9:30 am
Nick Smith, Jacque Klug and Holly Tichenor
State focused partnerships towards advancing reuse in Idaho, Oregon and Washington
This session will focus on showcasing results form a series of three professionally moderated workshops held in each state (Idaho/Oregon/Washington) with industrial, agricultural, utilities and municipal reuse stakeholders. The workshops provided opportunities for the participants to network and share various needs and challenges including operational and maintenance, permitting/regulatory, funding and public perception concerns. The workshops culminated in a series of recommended actions for WRA-PNW teams and interested groups from each state. These action items are part of an overall effort to support operators, policy makers, utility manager and interested parties involved in water reuse as a water.
|10:30am - 12:00pm||Session 13B: WateReuse: Hopping Over Hurdles|
Location: Room 420A
10:30am - 11:15am
Pat Heins, Shawn McKone, and Tressa Nicholas
So you need a permit in the Pacific Northwest…now what?
Regulators from Idaho, Oregon and Washington will discuss the steps for obtaining a permit to use recycled or reclaimed water in their state.
11:15 am - 12:00 pm
Water Reuse: Waste of Time or Innovative Opportunity?
21 years ago, a small community located just North of Boise decided to lay down some roots. 7 years later, another planned community sprang up. As we all know, there are some rather large obstacles immediately North of Boise that create some interesting infrastructure challenges that would be far too costly for these small communities to encumber. As luck would have it, there was an option. Hidden Springs and Avimor both made a bold decision to build and operate their own wastewater renewal facilities and find beneficial uses for the renewed water onsite as opposed to piping several miles and lift stations to the nearest municipal treatment plant or becoming point source dischargers. These decisions created incredible growth potential as it allowed the communities to reduce treatment costs for their residents, it allowed builders to build without exorbitant connection fees, and it helps keep irrigation costs low because they didn’t have to purchase irrigation water from the municipal supplier. This presentation will take a look at the current situations for both of these communities, some lessons that have been learned over the years, and provide insight for any engineers or operators looking to pursue reuse, and how both parties should work together to accomplish the needs of their constituents.
|1:15pm - 2:45pm||Session 20A: WateReuse: Reuse in the Community|
Location: Room 420A
1:15 pm - 2:00 pm
Launching Community Recycled Water Use Through Collaborative Planning for Multiple Drivers
The Eugene/Springfield Metropolitan Wastewater Management Commission (MWMC) is preparing to launch its first-ever outside-the-fence recycled water use. This milestone is being reached after a decade-long planning process to explore, study, and collaborate on “the right water at the right time at the right place.” The MWMC is now looking to break ground on construction of Class A recycled water facilities combining creative use of existing infrastructure, partnerships to demonstrate meaningful and growth-oriented applications, and establishing the MWMC as community water resource partner with an eye toward future regulatory compliance and climate resiliency assets.
2:00 pm - 2:45 pm
Using Research to Inform Community Decisions about Recycled Water Use
Contaminants of Emerging Concern (CECs) is the term applied to a broad array of trace chemicals that come from consumer, commercial and industrial products that are measurable in the environment. CECs are generally unregulated. Wastewater effluent and recycled water has been identified as a potential source of CECs. This session will describe CEC research projects being done to examine CEC presence in recycled water and the risk of CEC exposure from uses of recycled water for food crop irrigation and groundwater recharge. The research study design will be presented along with preliminary research results. The session will describe how research is being shared within the community and informing community discussions about the future of reuse in the respective regions. These presentations will provide a research and communication framework for communities that can be applied in discussing CECs and risk.
|3:00pm - 4:30pm||Session 20B: WateReuse: Making Reuse "Cool"|
Location: Room 420A
3:00 pm to 3:45 pm
Case Study for Datacenter Cooling Water Reuse
The Quincy Water Reuse Utility (QWRU) has just been commissioned by the City of Quincy to treat non-contact cooling water for reuse back into a portion of the Quincy datacenters. Microsoft, Washington Department of Ecology, US Bureau of Reclamation, and the Quincy-Columbia Irrigation District have played major roles in the success of this utility; the first of its kind in the State of Washington. Non-contact cooling water blowdown is treated to remove cations and anions that reduce the efficiency of evaporative cooling and helps to reduce the volume of cooling water used. In the past, potable water has been used for cooling water; however, this water is very hard and contains high levels silica. Both components negatively impact the cooling equipment; requiring additional equipment maintenance to retain the equipment’s cooling efficiency. The QWRU treats the cooling water to remove hardness and silica before being pumped back to the datacenters for cooling water. Cooling requires make-up water to replace from 60 to 80 percent water loss due to evaporation. Make-up water is provided by USBR M&I Water, potable water and, in the future, municipal Class A water. The QWRU consists of 10 distinct and specific water treatment unit processes to provide reuse water suitable for cooling. The QWRU is capable of providing from 2,304,000 to up to 3,600,000 gallons of treated water per day. Residuals from the treatment system is managed with on-site evaporation ponds and sludge management systems. The QWRU saves a precious potable water resource in an arid region of Washington State and will save up to 398,000,000 gallons of potable water in a year; enough to provide 5,450 residents potable water for a year.
3:45 pm to 4:45 pm
Strategic Planning: the key to internal alignment and program momentum
Can't seem to reach agreement? Often times, project progress is stifled by a difference of opinions. How can we create alignment among technical professionals, management, elected officials, and ratepayers?
Meaningful engagement, clear goals, consistent communications can create the synergy needed to get complex programs off the ground and the momentum required to carry them out. Even within a divided community, strategic planning can identify common threads, shared values, and a desired vision of the future.
Using regional and interstate case studies, we will discuss how strategic planning, inclusive communications, and two-way engagement create alignment, public trust, and confidence in water reuse solutions. This interactive session will provide you with the tools and tactics needed to turn barriers into breakthroughs.
|Date: Wednesday, 15/Sept/2021|
|8:00am - 10:15am||Session 25A: Collection & Conveyance|
Location: Room 420A
8:00am - 8:45am
Corroded Manhole Assessment, Rehabilitation Design, and Construction
Concrete manholes should have more structural strength than peanut butter, but PB-consistency concrete is exactly what Eagle Sewer District found as they conducted their periodic inspection of one section of collection system manholes. The culprit was found to be hydrogen sulfide corrosion from two nearby forcemain discharges. These forcemains, coupled with a very steep sloped pipe (up to 8 percent) down a hillside farther down the main were enough to release H2S that corroded the manholes faster than expected. Compounding the problem was the location of this main, through a high-end neighborhood and adjacent to a golf course. The groundwater up on the hill was not a factor, but the section at the bottom of the hill was in nearly 10-feet of groundwater.
The manholes were assessed first visually and then with a scrape test. From the ground, the 15 to 18-foot deep manholes appeared to be in good to fair condition. The scrape test was performed and the softened concrete sluffed from the wall like tooth paste or soft plaster. The downstream section of the system yielded less than 1-inch of concrete loss. As we worked upstream to the base of the hill and closer to the pump station discharges, up to almost 2-inches was discovered. Next to the pump station discharge, 3 inches of the 5-inch thick manhole wall was missing.
In addition to the condition assessment approach, this presentation will discuss the manhole rehabilitation methods that were considered. These include manhole replacement, liners, inserts, structural coating, and non-structural coatings for corrosion protection. The final design that resulted and the ultimate rehabilitation project will be presented. Lessons learned that will be shared include the how to complete rehabilitation technologies and coordination with neighbors and interested agencies. The manholes were successfully rehabilitated and have performed well for nearly a year and a half.
8:45am - 9:30am
Bringing Spiral Winding Rehabilitation to the Pacific Northwest
Spiral Wound Technology TM (SPR) is a pipeline rehabilitation method using strips of PVC or HDPE. Winding machines unroll strips of material that form to the pipe's shape, creating a new lining. The City of Portland Bureau of Environmental Services (BES) will be using the PVC SPR material on the Carolina Trunk rehabilitation project. Utilities across the globe have installed lining using SPR, including a few in the USA, but this is the first application in the Pacific Northwest. BES often uses pipeline rehabilitation on its aging infrastructure to extend the useful life of its sewer pipes. Upon successful completion of this pilot project, BES plans to add SPR to its toolbox of available rehabilitation techniques for future projects.
A significant advantage of SPR is the ability to install the material without flow diversion. With this method, it is possible to install lining with live flow during low flow periods. Since the Carolina Trunk is a combined sewer, we scheduled the work to take place at night during the summer when there are no rain events expected. Due to the Carolina Trunk's location along a busy arterial, being able to rehabilitate the sewer without diverting flow is critical to project success.
Constructed in 1909, the Carolina Trunk is a 51-inch diameter cast-in-place monolithic concrete circular sewer pipe. Several inspections revealed that the pipe is in fair to poor condition and needs rehabilitation. Defects observed throughout the pipe included longitudinal cracking and pipe deterioration with exposed aggregate and pitting. This project will rehabilitate approximately 800-feet of the trunk using SPR rehabilitation.
9:30am - 10:15am
Implementation of Telemetered Water Quality Sensors in the Sanitary Collection System
Clean Water Services, United States of America; firstname.lastname@example.org
Collecting continuous, reliable water quality data from the sanitary collection system without an excessive maintenance burden is a serious challenge for utilities, but one that is increasingly necessary for developing enhanced source control programs and protecting treatment plants from potential upsets. For several years, Clean Water Services (CWS) piloted various technologies, implementation methods, installations, and cleaning devices. While none of these pilots were ultimately successful, important lessons were learned in each of them that helped drive CWS towards successful implementation. Over the past two years, CWS has successfully developed and implemented a telemetered, continuous water quality sensing network in its sanitary collection system and has already been successful in tracking down and eliminating a consistent source of problems for one its treatment plants. CWS has developed a unique sensor holder that minimizes ragging and made use of robust sensors that are less sensitive to fats, oil, and grease buildup. To test this technology in addition to future technologies, CWS developed a test flume at its Forest Grove treatment plant that uses post-grit screen influent. This flume can be adjusted to simulate various velocities, depths, and sewer sizes and allows for the study and testing of different sensors, cleaning devices, and containment devices with close observations in a controlled environment that wouldn’t be possible in the sanitary collection system. CWS has conducted various experiments using this flume to study the factors that affect longevity, film buildup, and maintenance frequency for various probes. The lessons learned through CWS’s first few years of unsuccessful pilot studies were presented at PNCWA in 2019. In this talk, CWS will discuss how it finally became successful at developing and implementing a network of water quality sensors in the sanitary collection system, and where it is going from here.
|10:30am - 12:00pm||Session 25B: Regulatory Challenges: Thermal Compliance|
Location: Room 420A
10:30am - 11:15am
A Clean Water Act Approved Strategy for Temperature Compliance: City of Boise Clean Water Act 316(a) Thermal Variance Demonstration Project, V2.
Temperature effluent limits are challenging to meet and several alternative compliance strategies have been litigated. Section 316(a) of the Clean Water Act provides that the EPA (and delegated state agencies) may authorize alternate thermal conditions in NPDES permits where the effluent limitation is more stringent than necessary to assure the protection and propagation of a balanced, indigenous community (BIC) of shellfish, fish, and wildlife in and on the receiving waterbody. The City of Boise applied for a 316(a) thermal variance and completed a demonstration project. The initial demonstration strategy and results were presented at a previous PNCWA meeting. The strategy for the demonstration project was modified in coordination with Idaho DEQ as administration of the NPDES permitting program was transferred to the state. The results of the modified demonstration project will be presented.
The city conducted a Type II Demonstration: a predictive demonstration based on literature, laboratory, and field studies conducted to evaluate that proposed alternate thermal effluent limitations (ATELs) will provide adequate protection and propagation of the BIC, as characterized by Representative Important Species (RIS). Near field (mixing zone) and far field analyses were performed separately but considered collectively. The potential for adverse effects was evaluated in terms of temperatures in the context of RIS specific biothermal attributes from the scientific literature, local expertise, and Idaho field data. Results demonstrated that the city’s ATEL’s would assure the protection and propagation of the RIS and maintenance of the BIC in the Lower Boise River. The city’s thermal load does not, and will not, cause lethal or sublethal effects that would affect the protection and propagation of the RIS populations; i.e., not interfering with the RIS’s completion of life history functions of reproduction, spawning, growth, and migration. The city’s IPDES permit is anticipated in fall 2021, therefore the presentation will also include a description of the permitting process and outline implementation planning.
11:15am - 12:00pm
Taking a Watershed-Based Approach to Developing and Optimizing a Thermal Compliance Strategy
Clean Water Services, United States of America; email@example.com
The Tualatin River is a small river that receives wastewater discharges from over 600,000 residents and many large industries.The river and its tributaries contain salmonids which are impacted by water temperature increases caused by anthropogenic activities. Due to the relatively large discharges of wastewater to the relatively small river, the discharges can have a large effect on the temperature of the river that must be mitigated to protect aquatic life. Even more significant population and economic growth is projected in the watershed over the next 50 years. While Clean Water Services currently mitigates the thermal loads from its discharges through a Themal Management Plan that includes reuse, cogeneration, flow augmentation, and riparian shade projects, the projected growth of the population in the watershed and the expected effects of climate change require that an updated Temperature Compliance Strategy (TCS) be developed that will meet the temperature challenges into the future. However, there are a large number of potential actions that could be taken at the treatment plants and in the watershed to help decrease the temperature of the river and mitigate the effects of the thermal loads from the treatment plant discharges. Each of these actions has different strengths and weakness as well as variable temporal and spatial effectiveness which can often be affected by the other actions being taken. Optimizing which actions to take and when to take them is a difficult process. CWS has developed an updated Thermal Compliance Strategy that includes a suite of actions to be taken over time between 2025 and 2075. A tool was developed that can analyze a large array of potential actions in numerous combinations and predict their effectiveness, costs, benefits, and impacts. The tool relies on complex hydrodynamic and water quality models, data collection, economic analyses, and engineering analyses to compare and contrast the different actions over time, alone and in combination. Using the tool, CWS optimized the suite of actions and the timing of their implementation to maximize benefits to the river while minimizing cost and other impacts. This holistic method provides a much more effective TCS than effluent cooling alone.