Mike Froom, Business Development Director for Te-Tech Process Solutions in Southampton, UK, explores the advantages of a pulsed air lift sludge pumping choice compared to conventional 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 major housing growth, the temporary to Mott MacDonald Bentley (MMB) was for reliability, sustainability and low operating value. The relocation additionally allowed for an improve from 13,000 population to 15,000 for the 2030 design horizon.
The new £15.65 million works consists of duty/standby fine screens, a vortex grit removal unit and two 15.5m diameter main settling tanks adopted by organic treatment in seven trickling filters with two sixteen.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 process upstream of the primary settlement tanks.
Simple, low opex sludge pumping
For this crucial responsibility, MMB selected the te-sewpas pulsed air lift pump system equipped by Te-Tech Process Solutions. The self-contained unit incorporates a four.6kW duty aspect channel air blower, actuated air management valves, air manifold and management panel housed within a weatherproof GRP enclosure and is delivered to site absolutely 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 allows the frequency and length of desludging to be adjusted to permit the sludge to consolidate thus eliminating any potential ‘rat-holing’ and ensuring consistent desludging.
Smooth sailing may be located close to the tanks that it serves with flexible air delivery hoses routed through 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 main or humus tanks with typical individual 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 two humus tanks. Rather than utilizing the usual management panel, MMB determined to combine the te-sewpas controls into the central PLC and Te-Tech supplied a practical design specification for this objective. The challenge was accomplished in October 2019. “We’ve been utilizing the air lift techniques 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 especially strong and we decided to retrofit additional systems in place of typical progressive cavity pumps at both Stillington and Sutton-on-the-Forest.” Installation of those two methods was accomplished in April 2021.
Significant complete life cost savings
The te-sewpas system provides significant complete life cost financial savings when compared to standard pumped techniques. For a typical installation serving two tanks, just like the Stocksbridge challenge, primarily based on an estimated 25% reduction in the electrical energy consumption and lowered maintenance requirements, te-sewpas offers a 40% lower capital price and 50% reduction in operational price in comparison with a pumped desludge system.
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