Mike Froom, Business Development Director for Te-Tech Process Solutions in Southampton, UK, explores the advantages of a pulsed air lift sludge pumping possibility compared to typical pumped methods.
A te-sewpas unit at Stocksbridge.
When Yorkshire Water decided to relocate Stocksbridge Wastewater Treatment Works 2km to the south to allow a major housing development, the brief to Mott MacDonald Bentley (MMB) was for reliability, sustainability and low working price. The relocation also allowed for an improve from thirteen,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 elimination unit and two 15.5m diameter primary settling tanks adopted by organic treatment in seven trickling filters with two sixteen.7m humus settlement tanks. Sludge produced in ไดอะแฟรม ซีล is delivered to a chamber alongside the tanks after which flows by gravity to re-enter the process upstream of the primary settlement tanks.
Simple, low opex sludge pumping
For this important duty, MMB selected the te-sewpas pulsed air raise pump system equipped by Te-Tech Process Solutions. The self-contained unit incorporates a 4.6kW obligation side channel air blower, actuated air management valves, air manifold and management panel housed inside a weatherproof GRP enclosure and is delivered to web site totally assembled and tested. 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 duration of desludging to be adjusted to allow the sludge to consolidate thus eliminating any potential ‘rat-holing’ and ensuring consistent desludging.
The unit may be positioned near the tanks that it serves with flexible air delivery hoses routed through ducts to each of the desludge chambers. The air delivered is hot and in consequence there is not a want for thermal lagging or insulation. Each te-sewpas unit can serve up to four primary or humus tanks with typical particular person air supply 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 เพรสเชอร์เกจ , MMB determined to integrate the te-sewpas controls into the central PLC and Te-Tech offered a practical design specification for this objective. The challenge was completed in October 2019. “We’ve been utilizing the air raise techniques 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 especially robust and we decided to retrofit additional systems instead of standard progressive cavity pumps at both Stillington and Sutton-on-the-Forest.” Installation of those two techniques was accomplished in April 2021.
Significant whole life cost savings
The te-sewpas system offers vital whole life cost financial savings when compared to conventional pumped techniques. For a typical installation serving two tanks, just like the Stocksbridge challenge, based mostly on an estimated 25% discount in the electrical power consumption and reduced maintenance necessities, te-sewpas offers a 40% lower capital cost and 50% discount in operational cost in comparison with a pumped desludge system.
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