pressure gauge octa , Business Development Director for Te-Tech Process Solutions in Southampton, UK, explores the advantages of a pulsed air lift sludge pumping choice compared to standard pumped methods.
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 operating value. The relocation also allowed for an improve from 13,000 population 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 main settling tanks adopted by biological therapy 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 and then flows by gravity to re-enter the process upstream of the primary settlement tanks.
Simple, low opex sludge pumping
For this critical obligation, MMB chosen the te-sewpas pulsed air raise pump system equipped by Te-Tech Process Solutions. The self-contained unit incorporates a four.6kW responsibility side channel air blower, actuated air control valves, air manifold and control panel housed within a weatherproof GRP enclosure and is delivered to web site absolutely 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 making certain consistent desludging.
The unit may be located near the tanks that it serves with versatile air delivery hoses routed via ducts to each of the desludge chambers. The air delivered is sizzling and in consequence there is no want for thermal lagging or insulation. Each te-sewpas unit can serve up to four main or humus tanks with typical individual air delivery hose length up to 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 combine the te-sewpas controls into the central PLC and Te-Tech supplied a functional design specification for this function. The project was completed in October 2019. “We’ve been utilizing the air raise techniques of various makes on our websites for the final 20–25 years,” says Yorkshire Water’s Wastewater Asset Planning Sponsor Jan Buczylo, “The te-sewpas is particularly sturdy and we decided to retrofit additional methods instead of standard progressive cavity pumps at both Stillington and Sutton-on-the-Forest.” Installation of these two techniques was completed in April 2021.
Significant complete life cost savings
The te-sewpas system offers significant entire life price financial savings when in comparability with standard pumped systems. For a typical set up serving two tanks, just like the Stocksbridge challenge, primarily based on an estimated 25% discount in the electrical energy consumption and lowered upkeep requirements, te-sewpas provides a 40% lower capital cost and 50% reduction in operational cost compared to a pumped desludge system.
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