Mike Froom, Business Development Director for Te-Tech Process Solutions in Southampton, UK, explores the benefits of a pulsed air raise sludge pumping choice in comparability with conventional pumped techniques.
A te-sewpas unit at Stocksbridge.
When Yorkshire Water determined to relocate Stocksbridge Wastewater Treatment Works 2km to the south to permit a serious housing development, the brief to Mott MacDonald Bentley (MMB) was for reliability, sustainability and low working price. The relocation also allowed for an upgrade from 13,000 population to fifteen,000 for the 2030 design horizon.
The new £15.65 million works consists of duty/standby fantastic screens, a vortex grit elimination unit and two 15.5m diameter primary settling tanks followed by biological treatment in seven trickling filters with two sixteen.7m humus settlement tanks. Sludge produced in the humus settlement tanks is delivered to a chamber alongside the tanks and then flows by gravity to re-enter the process upstream of the primary settlement tanks.
Simple, low opex sludge pumping
For this critical obligation, MMB selected the te-sewpas pulsed air lift pump system supplied by Te-Tech Process Solutions. The self-contained unit incorporates a four.6kW responsibility aspect channel air blower, actuated air management valves, air manifold and management panel housed inside a weatherproof GRP enclosure and is delivered to website absolutely assembled and tested. Each pulse of air lifts a amount of sludge and discharges it from the sludge discharge pipe. A programmable timer within the PLC allows the frequency and length of desludging to be adjusted to allow the sludge to consolidate thus eliminating any potential ‘rat-holing’ and guaranteeing consistent desludging.
pressure gauge ดิจิตอล could be positioned near the tanks that it serves with flexible air supply hoses routed through ducts to each of the desludge chambers. The air delivered is scorching and in consequence there isn’t any need for thermal lagging or insulation. Each te-sewpas unit can serve as much as four primary or humus tanks with typical individual air supply hose length up to 35m.
At Stocksbridge, a single Type B te-sewpas unit with duty/standby air blowers serves the two humus tanks. Rather than utilizing the standard management panel, MMB decided to integrate the te-sewpas controls into the central PLC and Te-Tech offered a functional design specification for this objective. The challenge was accomplished in October 2019. “We’ve been using the air lift methods of various makes on our websites for the last 20–25 years,” says Yorkshire Water’s Wastewater Asset Planning Sponsor Jan Buczylo, “The te-sewpas is especially sturdy and we decided to retrofit additional techniques rather than typical progressive cavity pumps at both Stillington and Sutton-on-the-Forest.” Installation of those two systems was completed in April 2021.
Significant entire life value savings
The te-sewpas system offers significant whole life price savings when compared to standard pumped techniques. For a typical set up serving two tanks, like the Stocksbridge project, based mostly on an estimated 25% reduction within the electrical energy consumption and lowered maintenance requirements, te-sewpas offers a 40% lower capital value and 50% reduction in operational cost compared to a pumped desludge system.
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