Water & Wastewater Treatment Equipment Serving Seattle, WA
Precision lime slaking, biosolids stabilization, drying, storage, and truck loading systems engineered by RDP Technologies for Seattle and Puget Sound region municipal facilities.
Trusted Process Equipment for Seattle Water & Wastewater Plants
For over 45 years, RDP Technologies has been building robust equipment, backed by dependable process performance, based upon a foundation of practical technologies that simply perform. Seattle-area utilities count on RDP for clean, accurate, reliable systems that are simple and easy to maintain.
Biosolids Storage & Precision Truck Loading Systems
King County Wastewater Treatment Division operates the West Point Treatment Plant on the Magnolia bluff and the South Plant in Renton, two large regional facilities producing substantial daily biosolids volumes for the Puget Sound region. These plants depend on dependable storage and loadout equipment to keep the broader Loop biosolids program running on schedule, and RDP Technologies engineers biosolids storage systems and precision truck loading systems that automate the full flow from dewatering through to the departing truck.
Moving floor technology in live bottom bin storage keeps sticky sludge cake flowing reliably even through the Pacific Northwest’s wet, cool operating season, eliminating the bridging and rat-holing common to conventional steep-walled hoppers. Sludge cake truck loading runs automatically through the precision truck loading system, with most loads completed within minutes and held to within a couple hundred pounds of the operator’s target weight.
Three decades and approximately three hundred biosolids conveying equipment installations have refined a layout that keeps trucks clean, departure times predictable, and operator involvement minimal at the bay. Because the cycle runs without continuous attendance, Seattle-area plant staff can redirect labor toward higher-value work elsewhere in the facility. For utilities running heavy weekday hauler rotations to Eastern Washington land application sites, that automation directly improves daily throughput and reduces overtime costs.
Biosolids Lime Stabilization & Pasteurization Solutions in Seattle, WA
Biosolids handling for utilities in and around Seattle, WA operates under one of the more active state-level regulatory environments in the country, with Washington Department of Ecology providing detailed oversight in addition to federal EPA 503 requirements. RDP Technologies has been delivering compliant lime-based stabilization solutions since the federal rules were first established, supporting both Class A biosolids treatment and Class B biosolids stabilization across Pacific Northwest facilities.
The EnVessel Pasteurization biosolids pasteurization system stands as one of the most widely deployed Class A processes nationally, with more than 70 installations operating across the United States. EnVessel pairs lime addition with controlled supplemental heat instead of relying on heavy lime overdosing, keeping chemical demand reasonable while hitting the time, temperature, and pH thresholds required for complete pathogen kill.
Enhanced Pasteurization moves the cycle into a sealed sequencing batch reactor where lime drives pH above 12 and controlled heating completes disinfection. Both pathways serve as proven wastewater pathogen reduction equipment, supported by published case studies and decades of operational data from municipalities nationwide. For Seattle-area facilities planning capital upgrades or evaluating treatment options against Washington’s evolving biosolids and PFAS-related regulatory landscape, these are regulator-recognized options with strong long-term track records.
Lime Slaking & Feed Systems for Seattle Water Treatment Facilities
Seattle Public Utilities draws its drinking water from the Cedar River and Tolt River watersheds, both naturally soft surface water sources that require careful pH adjustment and corrosion control before reaching customers across the region. Lime feed plays a central role in stabilizing this naturally low-alkalinity water and meeting Lead and Copper Rule targets, and RDP Technologies designs lime slaking and feed systems engineered for the precision and reliability that Pacific Northwest municipal operations require.
The Tekkem family of lime slakers for water treatment applies load cell technology to combine a measured weight of quicklime with a measured weight of water, holding the slaking reaction within the proven 180°F to 190°F temperature window. This weight-based control approach enables precision lime dosing systems with slurry concentration adjustable from one percent up to thirty percent based on plant requirements.
The same Tekkem platform converts to operate as a hydrated lime feed system without any physical modifications, providing flexibility as lime market conditions shift across the Pacific Northwest. A continuous slurry delivery loop combined with pinch valve and flow meter dosing supports accurate feed at multiple application points within a facility. With only one moving part inside the reaction tank, maintenance demands stay infrequent and predictable for plants running around the clock through Washington’s variable seasonal demand cycle.
Custom Engineering & Process Equipment Support Serving Seattle
Water and wastewater infrastructure across the Puget Sound region has been continually expanded and modernized to handle one of the fastest growing metro areas in the western United States, with treatment facilities designed to operate through the region’s distinct wet season and to meet some of the most stringent water quality protections in the country. RDP Technologies brings over 45 years of custom process equipment engineering experience to capital projects across King, Pierce, and Snohomish counties.
As a wastewater treatment equipment manufacturer that handles design, fabrication, and controls programming under one roof, we adapt to existing tankage, constrained site footprints, and operator workflows rather than forcing a generic package into a difficult location. Our intelligent control platforms integrate cleanly with SCADA systems and meet the detailed reporting expectations of Washington Department of Ecology, regional clean water programs, and EPA Region 10 oversight.
We engage directly with municipal engineers, consulting firms, and plant operations staff from early scoping through commissioning and long-term technical support. Robust equipment, dependable process performance, and practical technologies that simply perform are the principles that have guided every project we deliver. Seattle-area facilities benefit from working with a single accountable manufacturer that designs, builds, and stands behind the equipment for the long haul.
Biosolids Drying Systems for Seattle Wastewater Plants
Hauling biosolids from Seattle-area treatment plants to Eastern Washington land application sites means trucks cross the Cascades and travel hundreds of miles before unloading. That long-distance hauling reality makes biosolids drying systems a strategic capital investment for Seattle wastewater plants working to reduce long-term operating expenses. The RDP-Fenton wastewater sludge dryer operates on a repeating batch cycle that allows drying time to be adjusted to match the natural variation in sludge cake solids concentration coming off the dewatering line.
Batch sludge drying equipment handles those upstream swings cleanly, whereas continuous-flow dryers often struggle when feed quality shifts unexpectedly. Operators in the field have repeatedly noted how little daily attention the system requires once a stable recipe is dialed in.
The dried product comes out significantly reduced in volume and weight, lowering trucking costs and opening pathways into fertilizer, soil amendment, and energy recovery markets across Washington, Oregon, and the broader Pacific Northwest. Pairing the dryer with upstream RDP lime feed or storage equipment gives Seattle wastewater plants a fully integrated biosolids handling line backed by a single manufacturer with consistent controls and ongoing support. Long service life and ease of operation were the design priorities from the start, and that focus shows up clearly in real-world performance data from installed sites across the country.
Ready to Discuss Your Seattle Project?
Connect with the RDP Technologies team to scope lime feed, biosolids, or drying equipment for your Seattle-area facility. We’re ready to help.