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).
|Date: Tuesday, 23/Oct/2018|
|10:30am - 12:00pm||Mobile: Mobile Session on Exhibit Floor|
Session Chair: Dick Finger, King County (retired0;
|Grand Ballroom - Exhibit Hall - Boise Center West|
"Your Pump Stations Aren't Going To Clean Themselves....Or Will They?"
Hidrostal Pumps, United States of America;
The new normal of pump stations is deciding how many times you'll need to send the vacuum truck to the pump station to clean out all of the floatable inorganic materials and FOG. Operation and Maintenance costs have escalated to a new level. The "new normal" needs to be, how can this pump station take care of itself. Further, utilization of full pump station capacity increases functionality of collection systems. Low NPSHR can be a life saver for problematic pump stations.
-Self-Cleaning wet well Configurations
Centrifuge Scroll Design Innovation – New Technology
Flottweg Separations Technology, United States of America;
Decanter centrifuges have been successfully providing excellent solids separation for the municipal wastewater market for over 50 years. The physical principals which govern these systems are simple, increase the gravitational force and the heavier solids will move to the exterior of the machine where they can be collected and removed.
Over the last few decades, various design changes have improved the functionality of these machines. The largest impact to performance has been scroll design, which can improve a centrifuge’s performance in regard to cake dryness, polymer consumption; solids capture efficiency, and energy consumption. This paper will address scroll and bowl design innovations of decanter centrifuges for wastewater dewatering and thickening. It will also introduce the latest centrifuge scroll design innovation which has proven to increase throughput by up to 15 %, increase cake dryness up to 10%, and reduce polymer consumption and power consumption by 20%.
Scroll innovations summary -
The pond depth (length of the clarifying section and drying section) of a decanter centrifuge determines the time that the liquid spends in the decanter; also known as retention time. As the pond depth increases (deep pond), the liquid volume and thus the retention time increases. This improves the clarifying performance. For early advancements, this was a clear and simple adjustment which had a positive impact on biosolids dewatering/thickening. The following image shows the standard pond design.
The next innovation, the double cone design, has been shown to dewater solids more effectively due to the increased pressure exerted on the solids as they are being scrolled to the discharge of the centrifuge. By reducing the available volume at the transition from the cylindrical section to the conical section of the bowl, the solids are subject to increased compressive forces. The double cone design also introduced a baffle disk at the beginning of the drying section. This allows only the driest matter to pass towards the solids outlet. The design also further increased the pond depth, and therefore, the time the liquid spent within the machine. This further improved the dryness of the biosolids.
The latest innovation has proven an increase of machine throughput by up to 15 %, increased cake solids which reduces the volume of biosolids by as much as 10 %, and is saving up to 20 % in energy and polymer consumptions. Named Xelletor, this newest scroll design eliminates the scroll body entirely and replaces it with a tubular space frame system. This maximizes the separation zone volume and improves overall performance.
Centrate energy recovery — A newer innovation in the centrifuge industry is energy recovery when discharging centrate. Redirecting the centrate’s discharge tangentially through the discharge, allows previously wasted energy to be imparted onto the main drive, reducing overall energy consumption by 10 to 20 percent.
EcoBELT - How Valparaiso, Indiana Optimized its Plant Using a Small-Footprint Primary Rotating Belt Filter
There are multiple drivers for rethinking capacity expansion including footprint, level of treatment, and power demand for operations. Real estate in particular can often make or break the feasibility of an effective and economical wastewater system upgrade, and many plant expansions are slowed or come with astronomical costs due to lack of space. In addition, adding capacity is often perceived to mean squeezing higher SOTEs out of secondary aeration or adding another tertiary polishing process. But what if there was a way to reduce loading to the plant instead?
Valparaiso, Indiana, is both a Chicago suburb, located 51 miles from the Willis Tower downtown, and a college town, host to three campuses including Valparaiso University. The town has a lot going for it, and as a result, it needed to expand its wastewater treatment capacity. Valparaiso did so in 2014, integrating the EcoBELT™ rotating belt filter (RBF) instead of building a new clarifier (see Fig. 1).
Rotating belt filtration is becoming an accepted solution to several distinct challenges in wastewater treatment in municipal and industrial applications, but in many cases they are being integrated to gain back space as they require 5% of the footprint of a conventional clarifier with higher levels of primary treatment including grit removal. In new wastewater plants, the rotating belt filters are being designed in place of conventional methods for primary clarification and grit removal. Strategic integration of this technology in new plants can reduce load and footprint to downstream treatment processes.
In existing plants like Valparaiso’s, these filters are being integrated to expand primary clarification and reduce BOD loading to the secondary system by 20-40% and suspended solids by 30-80%. As any engineer or operator will know; removing this loading from the front end improves the performance of secondary and tertiary processes. At Valparaiso, fully-automated hot water wash flushes fats, oils and greases that may accumulate over time, and EcoBELT’s reliable solids dewatering capability also means that loading isn’t just diverted, it falls into a dumpster to be easily disposed of through as it is suitable for landfilling (see Fig. 2).
Rotating belt filters are appealing from a life-cycle cost standpoint as well. Implementation at a fraction of the construction cost of conventional primary tanks is a big up-front savings. Power usage savings both in the primary treatment system as well as in downstream aeration help provide a life-cycle cost comparison of 1/5 that of conventional costs associated with primary settling.
This presentation will draw on the reports by multiple engineering firms around the world who have had an opportunity to study the umbrella of primary treatment technologies, reports that deserve a studious look. As well, the presentation will discuss the case history, design considerations and lessons learned from Valparaiso, Indiana, among others. Idaho engineers and municipalities deserve to know they can drastically increase plant capacity within 5% of the footprint and a fraction of the lifecycle cost of a primary clarifier, and thereby meet their wastewater treatment demands today, tomorrow, and beyond.
InDense - Improved Biomass Settleability Through Gravimetric Sludge Selection
World Water Works, United States of America;
As plants are looking to upgrade from traditional carbon removal to nutrient removal, there are new leapfrogging approaches to build compact, energy efficient treatment process schemes with improved operational ease. These biological processes can become more compact with the transition of the biomass to a more densified or granular sludge. The densified biomass settles more quickly and therefore the process can carry a higher mixed liquor inventory. Furthermore, this new approach is convenient for retrofits and for improved EBPR. The presentation will provide full-scale examples of several US based installations.
Intelligent Wastewater Pumping
Whitney Equipment, United States of America;
What if your wastewater pump could react to system upsets? What if your wastewater pump could adapt to the current demand and use only the power required to handle the incoming flow? What if your wastewater pump could identify a clog or jam and preemptively clear the debris? What if your wastewater pump could do all of this and so much more without adding complexity to your pump station control panel?
This mobile session will provide insight on where wastewater pumping technology has been, where it is currently, and where we are headed as an industry. Wastewater pumps need to adapt to the ever growing challenges of aging and growing collection systems, and at the same time do more with less power.
We will review three unique issues at three different cities in the Northwest that were address by intelligent pumps:
Novel Corrosion-Resistant Manhole Construction Methods
Predl Systems North America, Canada;
Today’s durable corrosion resistance in collection, conveyance and treatment systems relies on different existing technologies involving reinforced or unreinforced thermoplastics. While corrosion resistance penetrated the conveyance market, difficulty of installation and cost are still common barriers to adopting these technologies for corrosion-resistant manhole construction. Additionally, in remote, hard to access areas, these technologies are out of reach because of extensive machinery requirements. A first, patent-pending manhole construction approach combines existing proven technologies in wastewater collection and conveyance to make corrosion-resistant manholes readily accessible, both from the ease of construction and the cost perspective. A second alternative manhole construction technique, applicable both to new construction and retrofitting scenarios, allows for durable corrosion-resistant manhole construction in remote areas, with limited mechanized resources, where brick manholes were the only alternative up to this point.
Thermoplastic Joining Methods: Demonstration of Socket and Butt Fusion
Asahi/America, Inc., United States of America;
This hands-on demonstration and discussion is ideal for maintenance personnel, operators, engineers, and management who make decisions on installation methods for chemical and water pipelines.
Introduction (5 minutes)
Discussion (15 minutes)
Handout: 1 double sided page with material overview, welding types, third party resources for specifiers.
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