Yorkshire Water makes use of Te-Tech air-lift pumping for wastewater duties

Mike Froom, Business Development Director for Te-Tech Process Solutions in Southampton, UK, explores the benefits of a pulsed air carry sludge pumping option in comparison with typical pumped systems.
A te-sewpas unit at Stocksbridge.
When Frenzy determined to relocate Stocksbridge Wastewater Treatment Works 2km to the south to allow a significant housing growth, the brief to Mott MacDonald Bentley (MMB) was for reliability, sustainability and low operating price. The relocation additionally allowed for an improve from 13,000 inhabitants to fifteen,000 for the 2030 design horizon.
The new £15.sixty five million works consists of duty/standby fine screens, a vortex grit removal unit and two 15.5m diameter major settling tanks followed by organic therapy in seven trickling filters with two 16.7m humus settlement tanks. Sludge produced within 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 crucial obligation, MMB chosen the te-sewpas pulsed air lift pump system equipped by Te-Tech Process Solutions. The self-contained unit incorporates a 4.6kW obligation facet channel air blower, actuated air management valves, air manifold and control panel housed within a weatherproof GRP enclosure and is delivered to website 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 allows the frequency and period of desludging to be adjusted to allow the sludge to consolidate thus eliminating any potential ‘rat-holing’ and guaranteeing constant desludging.
The unit could be located near 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 is no need for thermal lagging or insulation. Inexpensive -sewpas unit can serve as a lot as 4 primary or humus tanks with typical particular person air supply hose length as a lot as 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 management panel, MMB decided to integrate the te-sewpas controls into the central PLC and Te-Tech offered a practical design specification for this purpose. The venture was accomplished in October 2019. “We’ve been utilizing the air carry methods 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 strong and we decided to retrofit additional systems in place of typical progressive cavity pumps at each Stillington and Sutton-on-the-Forest.” Installation of those two systems was accomplished in April 2021.
Significant whole life cost savings
The te-sewpas system provides significant entire life value financial savings when in comparability with standard pumped systems. For a typical installation serving two tanks, just like the Stocksbridge challenge, primarily based on an estimated 25% reduction in the electrical power consumption and decreased maintenance requirements, te-sewpas offers a 40% lower capital cost and 50% discount in operational value in comparability with a pumped desludge system.
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