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 conventional pumped techniques.
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 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 population to fifteen,000 for the 2030 design horizon.
The new £15.sixty five million works consists of duty/standby fantastic screens, a vortex grit removing unit and two 15.5m diameter main settling tanks adopted by biological remedy in seven trickling filters with two 16.7m humus settlement tanks. Sludge produced in the humus settlement tanks is delivered to a chamber alongside the tanks after which flows by gravity to re-enter the method upstream of the first settlement tanks.
Simple, low opex sludge pumping
For this crucial obligation, MMB selected the te-sewpas pulsed air carry pump system supplied by Te-Tech Process Solutions. The self-contained unit incorporates a 4.6kW obligation facet channel air blower, actuated air control valves, air manifold and control panel housed within a weatherproof GRP enclosure and is delivered to site absolutely assembled and tested. Each pulse of air lifts a quantity of sludge and discharges it from the sludge discharge pipe. A programmable timer within the PLC allows 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 supply hoses routed by way of ducts to every of the desludge chambers. The air delivered is scorching and as a result there is no need for thermal lagging or insulation. Each te-sewpas unit can serve as much as 4 primary or humus tanks with typical particular person air delivery hose length as much as 35m.
At Stocksbridge, a single Type B te-sewpas unit with duty/standby air blowers serves the two humus tanks. Rather than utilizing the usual management panel, MMB decided to combine the te-sewpas controls into the central PLC and Te-Tech provided a functional design specification for this objective. เพรสเชอร์เกจคือ was completed in October 2019. “We’ve been using the air raise systems 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 robust and we determined to retrofit additional methods rather than conventional progressive cavity pumps at each Stillington and Sutton-on-the-Forest.” Installation of these two systems was completed in April 2021.
Significant whole life cost financial savings
The te-sewpas system supplies vital entire life value savings when compared to standard pumped systems. For a typical installation serving two tanks, just like the Stocksbridge project, based mostly on an estimated 25% reduction in the electrical power consumption and reduced upkeep necessities, te-sewpas offers a 40% decrease capital cost and 50% reduction in operational cost compared to a pumped desludge system.
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