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Mike Froom, Business Development Director for Te-Tech Process Solutions in Southampton, UK, explores the benefits of a pulsed air carry sludge pumping possibility compared to standard pumped systems.
A te-sewpas unit at Stocksbridge.
When Yorkshire Water decided to relocate Stocksbridge Wastewater Treatment Works 2km to the south to permit a serious housing improvement, the brief to Mott MacDonald Bentley (MMB) was for reliability, sustainability and low working value. The relocation additionally allowed for an improve from 13,000 population to fifteen,000 for the 2030 design horizon.
The new £15.65 million works consists of duty/standby fine screens, a vortex grit removing unit and two 15.5m diameter primary settling tanks followed by biological 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 after which flows by gravity to re-enter the method upstream of the primary settlement tanks.
Simple, low opex sludge pumping
For this important obligation, MMB selected the te-sewpas pulsed air lift pump system supplied by Te-Tech Process Solutions. The self-contained unit incorporates a 4.6kW responsibility facet channel air blower, actuated air control valves, air manifold and control panel housed within a weatherproof GRP enclosure and is delivered to site fully assembled and tested. Each pulse of air lifts a quantity of sludge and discharges it from the sludge discharge pipe. A programmable timer in the PLC permits the frequency and duration of desludging to be adjusted to permit 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 flexible 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. Each te-sewpas unit can serve up to four primary or humus tanks with typical individual 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 2 humus tanks. Rather than utilizing the standard management panel, MMB determined to integrate the te-sewpas controls into the central PLC and Te-Tech provided a functional design specification for this objective. The project was completed in October 2019. “We’ve been using the air carry techniques of assorted 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 strong and we determined to retrofit additional techniques rather than conventional progressive cavity pumps at both Stillington and Sutton-on-the-Forest.” ความหมายของเครื่องวัดความดัน of these two systems was accomplished in April 2021.
Significant whole life cost financial savings
The te-sewpas system supplies vital whole life price financial savings when in comparability with typical pumped methods. For a typical set up serving two tanks, just like the Stocksbridge project, based on an estimated 25% discount within the electrical power consumption and reduced maintenance requirements, te-sewpas provides a 40% decrease capital cost and 50% reduction in operational price in comparability with a pumped desludge system.
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