Expelling Gas: Practical Approaches to Reducing Greenhouse Gases
Friday, March 8, 8 AM - 12 PM
Hosted by US Water Alliance and PNCWA Sustainability and Biosolids Committee
For over 400 years, our energy use and infrastructure has centered mainly on burning the remains of living things that died a few hundred million years ago. In the next 50 years, there will be a profound shift towards energy derived from sources that don't involve combustion. It is imperative that greenhouse gas (GHG) emissions are reduced globally. What is the water sector's role in GHG emissions and what can the typical wastewater treatment plant in the US do to reduce emissions, save energy, and reduce their operating costs?
This workshop will explain the big picture of the energy transition and the magnitude of the issue, both regionally, nationally, and internationally.
Based on the collective experience with greenhouse gas inventories for wastewater treatment facilities, we will describe how the inventory protocols align with the steps in the treatment process, as well as describe the relative magnitudes of GHG emissions within a plant and within an organization overall.
Participants will work with the experienced team in small groups to evaluate different measures within the plant process to reduce greenhouse gases. We will focus on aeration, nutrient removal, and solids.
Back in a large group setting, we will explore where changes and upgrades can have the biggest impact on GHG emissions.
We'll then discuss how water and wastewater facilities and organizations can play an active role in helping the massive transformation to reducing greenhouse gases starting with low- and no-cost changes that can be implemented in facilities to reduce energy use. This helps guide operators deploy renewables more rapidly (and we'll explain how) while lowering the plant's monthly costs. We will discuss how longer-term investments, including optimization upgrades, can help lower emissions while improving operations. We will discuss how major upgrades, replacements, and expansions can be ranked for GHG impact as well as positioned to take advantage of the funding available through our friends IRA and BIL.
Wastewater facilities and collection systems can also be active players in the load-shifting and load-shedding space, and we'll share ideas and practices from facilities that have participated in demand management programs. Again, this helps the grid by reducing localized congestion, and it usually provides revenue, too. On a more capital-intensive note, facilities that utilize anaerobic digestion have a window in time now where renewable gas projects can be incredibly cost-effective – and may be one of the last places where we will see combustion continue. Throughout the presentation, we will share some of the more interesting and diverse projects that have been initiated across the country. We will also discuss some "coming attractions" in the energy and greenhouse gas space that could have impact on your bottom line.
We will have fun along the way.
Aeration Control for Practitioners: Optimization of Aeration, Process, and Energy
Friday, March 8, 8 AM - 12 PM
Hosted by PNCWA Emerging Technologies Committee, WEF Municipal Resource and Recovery Design Community, and I&C Workgroup
Aeration control is a complex process control system in Water Resource Recovery Facilities. Proper aeration control drives nitrification reliability, nutrient removal performance, sludge settleability, and energy costs. Many facilities operate inefficient aeration control systems that lack accuracy. Proper design, programming, tuning, and set point selection requires a knowledge of treatment process dynamics, mechanical system components, control programming options, instrumentation, and set points as well as how all of these components interact and communicate with each other.
This workshop is based on a similar successful workshop provided at WEFTEC 2023 and is tailored to wastewater operators, EI&C, design, mechanical, SCADA, and process engineers, and equipment suppliers to practice identifying causes for common aeration control inefficiencies and systematic methods for tuning and optimizing control accuracy to improve process performance and lower energy costs. While many aeration control systems could be improved through capital replacements (smaller blowers, better control valves and actuators, etc.) this workshop will emphasize opportunities facility staff has to maximize aeration control performance through no or low-cost improvements, such as system tuning, setpoint selections, programming, or operational changes and instrumentation placement.
At the conclusion of this workshop, participants will be able to analyze aeration control systems for inefficiencies, identify the contributing factors for inefficiencies and apply formulaic approaches to optimize aeration control performance challenges in the field or in their designs.