Water & Wastewater Treatment Equipment Serving Spokane, WA
Precision lime feed, biosolids stabilization, drying, storage, and truck loading systems engineered by RDP Technologies for Spokane and Inland Northwest municipal facilities.
Request a Consultation View ResourcesTrusted Process Equipment for Spokane Water & Wastewater Plants
For over 45 years, RDP Technologies has built process equipment that performs dependably in the field, grounded in a practical engineering approach proven across hundreds of municipal installations. Utilities across the Inland Northwest rely on RDP for accurate, durable systems that stay easy to operate and simple to maintain over a long service life.
Custom Engineering & Process Equipment Support Serving Spokane
Water and wastewater infrastructure across the Spokane region operates over the Spokane Valley-Rathdrum Prairie Aquifer, an EPA-designated sole-source aquifer that supplies nearly all of the area's drinking water and sits in direct connection with the Spokane River. That relationship makes aquifer protection and some of the most stringent river nutrient and toxics limits in the state central to how facilities are designed and run, alongside the region's cold winters and hot, dry summers. RDP Technologies brings over 45 years of custom process equipment engineering to capital projects across Spokane, Stevens, Kootenai, and neighboring Inland Northwest counties.
Because design, fabrication, and controls programming stay under one roof, we tailor equipment to existing tankage, site constraints, and the workflows operators already rely on, rather than forcing a stock package into a poor fit. Our control platforms integrate cleanly with SCADA and meet the detailed reporting the Washington State Department of Ecology and EPA Region 10 require.
We work directly with municipal engineers, consulting firms, and plant operations staff from the earliest scoping through commissioning and long-term technical support. Durable equipment, dependable process performance, and practical technology that keeps performing are the principles behind every project we deliver. Spokane-area facilities gain a single accountable manufacturer that designs, builds, and stands behind its equipment for the long haul.
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Biosolids Storage & Precision Truck Loading Systems
The City of Spokane operates the Riverside Park Water Reclamation Facility, which discharges to the Spokane River and has built out advanced treatment to meet some of the most demanding phosphorus and toxics limits in the Northwest. Treatment at that level produces steady daily biosolids, and Spokane's long-running program land-applies much of that material to dryland wheat farms across the eastern Washington plateau. Reliable storage and loadout equipment keeps trucks moving to those farms on schedule through the Inland Northwest's cold winters and hot, dry summers. RDP Technologies engineers biosolids storage systems and precision truck loading systems that automate the full run, from the dewatering line to the fully loaded truck pulling out.
Moving floor technology inside live bottom bin storage keeps heavy sludge cake advancing steadily, heading off the bridging and rat-holing that stall conventional steep-walled hoppers. Loadout runs automatically through the precision truck loading system, closing most loads within minutes and holding within a couple hundred pounds of the operator's target weight.
Three decades and roughly three hundred biosolids conveying installations have refined a bay layout that keeps trucks clean, departures on schedule, and operator attention at the bay minimal. With loading running on its own, Spokane-area staff can redirect their hours to higher-value work across the plant. For a program hauling to dryland farms across eastern Washington through the full range of Inland Northwest seasons, that automation lifts throughput and holds overtime down.
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Biosolids Drying Systems for Spokane Wastewater Plants
With stringent Spokane River water quality requirements keeping a spotlight on how the region manages its residuals, and hauling distances to eastern Washington farmland running long, reducing biosolids weight is one of the most effective steps a Spokane-area plant can take. Drying offers a direct path to lower tonnage and higher-value end products. The RDP-Fenton sludge dryer runs on a repeating batch cycle, letting drying time follow the natural variation in cake dryness coming off dewatering rather than a fixed rate.
Batch sludge drying equipment absorbs those upstream shifts cleanly, where continuous-flow dryers often struggle when feed quality changes without warning. Operators in the field regularly note how little daily attention the system needs once a stable recipe is dialed in.
The dried product emerges markedly reduced in volume and weight, cutting trucking costs and opening pathways into fertilizer, soil amendment, and energy recovery markets across the Inland Northwest and the wider region. Paired with upstream RDP lime feed or storage equipment, a Spokane plant gains a fully integrated biosolids line backed by one manufacturer with consistent controls and ongoing support. Long service life and simple operation guided the design from the start, and installed sites bear that out in real performance data.
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Lime Slaking & Feed Systems for Spokane Water Treatment Facilities
Unusually for a city its size, Spokane draws nearly all of its drinking water from groundwater, pumping from the highly productive Spokane Valley-Rathdrum Prairie Aquifer rather than from surface reservoirs. Even high-quality aquifer water benefits from careful pH adjustment and corrosion control to keep finished water stable across the distribution system, particularly under the Lead and Copper Rule. Dependable lime feed supports that stabilization chemistry where it is needed. RDP designs lime slaking and feed systems engineered to deliver the precision and reliability high-volume Inland Northwest operations require.
Tekkem slakers rely on 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 window. That weight-based control enables precision dosing with slurry concentration adjustable from one percent up to thirty percent based on plant requirements.
The same Tekkem platform converts to a hydrated lime feed system without any physical modifications, providing flexibility as lime market conditions shift across the Pacific Northwest. A continuous slurry 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.
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Biosolids Lime Stabilization & Pasteurization Solutions in Spokane, WA
Washington manages biosolids under the Department of Ecology, and while eastern Washington's dryland farms have long supported Class B land application, growing attention to PFAS and emerging contaminants is drawing more utilities toward Class A material and the flexibility it brings. RDP Technologies has delivered EPA 503 compliant lime-based solutions since those federal rules were first established, supporting both Class A biosolids treatment and Class B biosolids stabilization at facilities across the Pacific Northwest.
EnVessel Pasteurization is one of the most widely deployed Class A processes in the country, with more than 70 installations in operation. It pairs lime addition with controlled supplemental heat rather than relying on heavy lime overdosing, keeping chemical demand reasonable while reliably meeting the time, temperature, and pH thresholds required for full 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 pathogen reduction equipment, supported by published case studies and decades of municipal operating data. For Spokane-area facilities planning capital upgrades against Department of Ecology requirements and evolving reuse expectations, these are regulator-recognized options with strong long-term track records.
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