Mike Froom, Business Development Director for Te-Tech Process Solutions in Southampton, UK, explores the advantages of a pulsed air lift sludge pumping choice compared to typical 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 transient to Mott MacDonald Bentley (MMB) was for reliability, sustainability and low operating value. เพรสเชอร์เกจดิจิตอล allowed for an improve from 13,000 population to fifteen,000 for the 2030 design horizon.
The new £15.sixty five million works consists of duty/standby fine screens, a vortex grit removing unit and two 15.5m diameter main settling tanks adopted by organic treatment in seven trickling filters with two sixteen.7m humus settlement tanks. Sludge produced within the humus settlement tanks 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 critical obligation, MMB chosen the te-sewpas pulsed air raise pump system supplied by Te-Tech Process Solutions. The self-contained unit incorporates a four.6kW duty side channel air blower, actuated air control valves, air manifold and management panel housed within a weatherproof GRP enclosure and is delivered to website totally 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 allow the sludge to consolidate thus eliminating any potential ‘rat-holing’ and ensuring consistent desludging.
The unit may be situated 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 isn’t any want for thermal lagging or insulation. Each te-sewpas unit can serve as a lot 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 2 humus tanks. Rather than using the usual control panel, MMB decided to combine the te-sewpas controls into the central PLC and Te-Tech offered a practical design specification for this function. The venture was completed in October 2019. “We’ve been using the air carry techniques of varied makes on our sites for the last 20–25 years,” says Yorkshire Water’s Wastewater Asset Planning Sponsor Jan Buczylo, “The te-sewpas is especially robust and we decided to retrofit further methods in place of conventional progressive cavity pumps at both Stillington and Sutton-on-the-Forest.” Installation of these two systems was accomplished in April 2021.
Significant whole life value financial savings
The te-sewpas system provides vital complete life cost savings when compared to conventional pumped techniques. For a typical set up serving two tanks, just like the Stocksbridge challenge, primarily based on an estimated 25% discount in the electrical power consumption and decreased upkeep necessities, te-sewpas provides a 40% decrease capital value and 50% discount in operational price compared to a pumped desludge system.
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