Mike Froom, Business Development Director for Te-Tech Process Solutions in Southampton, UK, explores the advantages of a pulsed air raise sludge pumping choice compared to conventional pumped systems.
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 growth, the transient to Mott MacDonald Bentley (MMB) was for reliability, sustainability and low working value. The relocation also allowed for an upgrade from thirteen,000 inhabitants to 15,000 for the 2030 design horizon.
The new £15.sixty five million works consists of duty/standby fantastic screens, a vortex grit removing unit and two 15.5m diameter main settling tanks adopted 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 critical obligation, MMB chosen the te-sewpas pulsed air lift pump system supplied by Te-Tech Process Solutions. The self-contained unit incorporates a four.6kW obligation side channel air blower, actuated air management valves, air manifold and management panel housed within a weatherproof GRP enclosure and is delivered to site totally 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 ensuring consistent desludging.
The unit could be located near the tanks that it serves with versatile air supply hoses routed via ducts to each of the desludge chambers. The air delivered is hot and in consequence there is not a need for thermal lagging or insulation. Each te-sewpas unit can serve up to 4 major or humus tanks with typical individual air delivery hose size 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 using the usual control panel, MMB determined to integrate the te-sewpas controls into the central PLC and Te-Tech provided a useful design specification for this objective. The venture was completed in October 2019. “We’ve been using the air raise techniques of assorted makes on our websites for the final 20–25 years,” says Yorkshire Water’s Wastewater Asset Planning Sponsor Jan Buczylo, “The te-sewpas is especially robust and we decided to retrofit extra techniques in place of conventional progressive cavity pumps at each Stillington and Sutton-on-the-Forest.” Installation of those two systems was accomplished in April 2021.
http://myprivatenetblog.xyz -sewpas system offers significant complete life value savings when in comparison with conventional pumped systems. For a typical set up serving two tanks, like the Stocksbridge venture, primarily based on an estimated 25% discount within the electrical power consumption and decreased maintenance requirements, te-sewpas supplies a 40% lower capital cost and 50% discount in operational price in comparison with a pumped desludge system.
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