Mike Froom, Business Development Director for Te-Tech Process Solutions in Southampton, UK, explores the advantages of a pulsed air raise sludge pumping possibility compared to standard pumped systems.
A te-sewpas unit at Stocksbridge.
When Yorkshire Water decided to relocate Stocksbridge Wastewater Treatment Works 2km to the south to permit a significant housing growth, the transient to Mott MacDonald Bentley (MMB) was for reliability, sustainability and low working value. The relocation also allowed for an improve from 13,000 inhabitants to 15,000 for the 2030 design horizon.
The new £15.65 million works consists of duty/standby fantastic screens, a vortex grit removing unit and two 15.5m diameter major settling tanks followed by biological treatment in seven trickling filters with two 16.7m humus settlement tanks. Sludge produced within pressure gauge ออก หลัง 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 crucial responsibility, MMB chosen the te-sewpas pulsed air carry pump system equipped by Te-Tech Process Solutions. The self-contained unit incorporates a four.6kW responsibility side 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 permits the frequency and duration of desludging to be adjusted to permit the sludge to consolidate thus eliminating any potential ‘rat-holing’ and making certain constant desludging.
The unit could be situated near the tanks that it serves with versatile air delivery hoses routed via ducts to every of the desludge chambers. The air delivered is sizzling and as a result there isn’t any want for thermal lagging or insulation. Each te-sewpas unit can serve up to 4 primary or humus tanks with typical individual air supply hose size as a lot as 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 control panel, MMB decided to combine the te-sewpas controls into the central PLC and Te-Tech provided a practical design specification for this objective. The challenge was completed in October 2019. “We’ve been utilizing the air carry methods of assorted makes on our sites for the final 20–25 years,” says Yorkshire Water’s Wastewater Asset Planning Sponsor Jan Buczylo, “The te-sewpas is particularly robust and we decided to retrofit additional systems in place of standard progressive cavity pumps at both Stillington and Sutton-on-the-Forest.” Installation of those two systems was completed in April 2021.
Significant whole life cost savings
The te-sewpas system provides vital whole life value savings when compared to standard pumped techniques. For a typical installation serving two tanks, just like the Stocksbridge challenge, based mostly on an estimated 25% discount within the electrical power consumption and decreased maintenance requirements, te-sewpas supplies a 40% decrease capital value and 50% discount in operational cost compared to a pumped desludge system.
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