Yorkshire Water uses Te-Tech air-lift pumping for wastewater duties

Mike Froom, Business Development Director for Te-Tech Process Solutions in Southampton, UK, explores the advantages of a pulsed air lift sludge pumping possibility in comparability with conventional 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 major housing development, the temporary to Mott MacDonald Bentley (MMB) was for reliability, sustainability and low operating cost. The relocation additionally 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 fantastic screens, a vortex grit removing unit and two 15.5m diameter primary settling tanks adopted by organic treatment 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 and then flows by gravity to re-enter the process upstream of the primary settlement tanks.
Simple, low opex sludge pumping
For this critical responsibility, MMB selected the te-sewpas pulsed air raise pump system equipped by Te-Tech Process Solutions. The self-contained unit incorporates a four.6kW duty side channel air blower, actuated air management valves, air manifold and control 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 in the PLC allows the frequency and length of desludging to be adjusted to allow the sludge to consolidate thus eliminating any potential ‘rat-holing’ and making certain consistent desludging.
Secrets can be located close to the tanks that it serves with versatile air delivery hoses routed by way of ducts to every of the desludge chambers. The air delivered is hot and in consequence there isn’t a want for thermal lagging or insulation. Each te-sewpas unit can serve as much as four major or humus tanks with typical particular person air delivery hose size as a lot as 35m.
At Stocksbridge, a single Type B te-sewpas unit with duty/standby air blowers serves the two humus tanks. Rather than using Frenzy , MMB decided to combine the te-sewpas controls into the central PLC and Te-Tech offered a functional design specification for this function. The venture was accomplished in October 2019. “We’ve been using the air raise 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 standard progressive cavity pumps at both Stillington and Sutton-on-the-Forest.” Installation of those two techniques was accomplished in April 2021.
Significant complete life cost savings
The te-sewpas system offers vital complete life value financial savings when in comparison with standard pumped techniques. For a typical set up serving two tanks, like the Stocksbridge project, primarily based on an estimated 25% reduction in the electrical power consumption and decreased upkeep requirements, te-sewpas supplies a 40% lower capital value and 50% reduction in operational value compared to a pumped desludge system.
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