Mike Froom, Business Development Director for Te-Tech Process Solutions in Southampton, UK, explores the advantages of a pulsed air raise sludge pumping choice in comparability 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 permit a serious housing growth, the brief to Mott MacDonald Bentley (MMB) was for reliability, sustainability and low operating value. The relocation also allowed for an upgrade from thirteen,000 inhabitants to 15,000 for the 2030 design horizon.
The new £15.65 million works consists of duty/standby nice screens, a vortex grit removal unit and two 15.5m diameter primary settling tanks followed by biological therapy 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 responsibility, MMB selected the te-sewpas pulsed air raise pump system equipped by Te-Tech Process Solutions. The self-contained unit incorporates a 4.6kW responsibility aspect channel air blower, actuated air management valves, air manifold and management panel housed within a weatherproof GRP enclosure and is delivered to site fully 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 period 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 close to the tanks that it serves with versatile air delivery hoses routed via ducts to every of the desludge chambers. The air delivered is hot and in consequence there is no want for thermal lagging or insulation. Formula -sewpas unit can serve up to 4 major or humus tanks with typical individual 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 control panel, MMB decided to integrate the te-sewpas controls into the central PLC and Te-Tech provided a practical design specification for this function. The venture was accomplished in October 2019. “We’ve been utilizing the air carry methods of various makes on our sites for the last 20–25 years,” says Yorkshire Water’s Wastewater Asset Planning Sponsor Jan Buczylo, “The te-sewpas is particularly strong and we decided to retrofit extra systems in place of typical progressive cavity pumps at each Stillington and Sutton-on-the-Forest.” Installation of those two techniques was accomplished in April 2021.
Significant whole life cost financial savings
The te-sewpas system provides significant whole life price savings when compared to conventional pumped methods. For a typical installation serving two tanks, like the Stocksbridge project, based mostly on an estimated 25% reduction within the electrical power consumption and lowered maintenance necessities, te-sewpas supplies a 40% decrease capital price and 50% discount in operational cost in comparability with a pumped desludge system.
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