Mike Froom, Business Development Director for Te-Tech Process Solutions in Southampton, UK, explores the benefits of a pulsed air lift sludge pumping choice in comparison with typical pumped methods.
A te-sewpas unit at Stocksbridge.
When Yorkshire Water determined to relocate Stocksbridge Wastewater Treatment Works 2km to the south to allow a significant housing development, the brief to Mott MacDonald Bentley (MMB) was for reliability, sustainability and low working cost. The relocation additionally allowed for an upgrade from thirteen,000 inhabitants to fifteen,000 for the 2030 design horizon.
The new £15.sixty five million works consists of duty/standby nice screens, a vortex grit removing unit and two 15.5m diameter major settling tanks followed by organic therapy 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 first settlement tanks.
Simple, low opex sludge pumping
For this critical obligation, MMB selected the te-sewpas pulsed air raise pump system supplied by Te-Tech Process Solutions. The self-contained unit incorporates a 4.6kW responsibility side channel air blower, actuated air management valves, air manifold and control panel housed within a weatherproof GRP enclosure and is delivered to web site absolutely assembled and examined. Each pulse of air lifts a amount of sludge and discharges it from the sludge discharge pipe. A programmable timer in the PLC permits the frequency and length of desludging to be adjusted to permit the sludge to consolidate thus eliminating any potential ‘rat-holing’ and ensuring constant desludging.
The unit can be positioned close to the tanks that it serves with versatile air delivery hoses routed through ducts to each of the desludge chambers. The air delivered is hot and in consequence there is not a need for thermal lagging or insulation. Each te-sewpas unit can serve as much as four major or humus tanks with typical individual air delivery hose length up to 35m.
At Stocksbridge, a single Type B te-sewpas unit with duty/standby air blowers serves the 2 humus tanks. Rather than utilizing the standard management panel, MMB decided to integrate the te-sewpas controls into the central PLC and Te-Tech supplied a practical design specification for this objective. The project was accomplished in October 2019. “We’ve been using the air lift methods of varied makes on our sites for the final 20–25 years,” says Yorkshire Water’s Wastewater Asset Planning Sponsor Jan Buczylo, “The te-sewpas is especially strong and we decided to retrofit further systems rather than typical progressive cavity pumps at both Stillington and Sutton-on-the-Forest.” Installation of those two methods was accomplished in April 2021.
Significant complete life value savings
The te-sewpas system supplies important complete life value savings when compared to standard pumped systems. For pressure gauge ราคา up serving two tanks, just like the Stocksbridge challenge, based on an estimated 25% discount in the electrical power consumption and reduced upkeep requirements, te-sewpas offers a 40% lower capital value and 50% discount in operational cost compared to a pumped desludge system.
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