Mike Froom, Business Development Director for Te-Tech Process Solutions in Southampton, UK, explores the benefits of a pulsed air carry sludge pumping choice compared to standard pumped techniques.
A te-sewpas unit at Stocksbridge.
When Yorkshire Water determined to relocate Stocksbridge Wastewater Treatment Works 2km to the south to allow a major housing improvement, the transient to Mott MacDonald Bentley (MMB) was for reliability, sustainability and low operating 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 nice screens, a vortex grit removing unit and two 15.5m diameter main settling tanks followed by organic therapy 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 first settlement tanks.
Simple, low opex sludge pumping
For this critical obligation, MMB chosen the te-sewpas pulsed air lift pump system supplied by Te-Tech Process Solutions. The self-contained unit incorporates a 4.6kW responsibility side channel air blower, actuated air control valves, air manifold and management panel housed inside a weatherproof GRP enclosure and is delivered to site totally assembled and examined. Each pulse of air lifts a quantity of sludge and discharges it from the sludge discharge pipe. A programmable timer within 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 guaranteeing consistent desludging.
The unit may be situated near the tanks that it serves with versatile air delivery hoses routed via ducts to every of the desludge chambers. The air delivered is sizzling and consequently there is not any need for thermal lagging or insulation. Each te-sewpas unit can serve up to 4 main 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 the usual management panel, MMB decided to integrate the te-sewpas controls into the central PLC and Te-Tech supplied a functional design specification for this objective. pressure gauge octa was completed in October 2019. “We’ve been utilizing the air raise methods of varied makes on our sites for the final 20–25 years,” says Yorkshire Water’s Wastewater Asset Planning Sponsor Jan Buczylo, “The te-sewpas is particularly robust and we determined to retrofit further techniques in place of typical progressive cavity pumps at each Stillington and Sutton-on-the-Forest.” Installation of those two methods was accomplished in April 2021.
Significant entire life cost savings
The te-sewpas system supplies significant complete life value financial savings when compared to conventional pumped methods. For a typical installation serving two tanks, just like the Stocksbridge challenge, based mostly on an estimated 25% discount within the electrical power consumption and lowered maintenance necessities, te-sewpas offers a 40% lower capital price and 50% discount in operational price compared to a pumped desludge system.
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