Mike Froom, Business Development Director for Te-Tech Process Solutions in Southampton, UK, explores the advantages of a pulsed air lift sludge pumping possibility in comparison with typical pumped techniques.
A te-sewpas unit at Stocksbridge.
When Yorkshire Water decided to relocate Stocksbridge Wastewater Treatment Works 2km to the south to allow a major housing development, the transient to Mott MacDonald Bentley (MMB) was for reliability, sustainability and low operating price. The relocation additionally allowed for an improve from thirteen,000 population 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 primary settling tanks adopted by organic therapy 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 and then flows by gravity to re-enter the process upstream of the primary settlement tanks.
Simple, low opex sludge pumping
For this critical duty, MMB selected the te-sewpas pulsed air lift pump system equipped by Te-Tech Process Solutions. The self-contained unit incorporates a 4.6kW obligation aspect channel air blower, actuated air control valves, air manifold and control panel housed inside a weatherproof GRP enclosure and is delivered to website fully assembled and tested. Each pulse of air lifts a quantity of sludge and discharges it from the sludge discharge pipe. A programmable timer within the PLC permits the frequency and duration of desludging to be adjusted to allow the sludge to consolidate thus eliminating any potential ‘rat-holing’ and making certain consistent desludging.
ตัววัดแรงดันน้ำ can be situated near the tanks that it serves with versatile air supply hoses routed via ducts to every of the desludge chambers. The air delivered is scorching and consequently there is no want for thermal lagging or insulation. Each te-sewpas unit can serve as a lot as 4 main or humus tanks with typical particular person air delivery 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 utilizing the standard control panel, MMB decided to combine 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 utilizing the air lift 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 determined to retrofit extra methods in place of typical progressive cavity pumps at both Stillington and Sutton-on-the-Forest.” Installation of these two methods was accomplished in April 2021.
Significant entire life price financial savings
The te-sewpas system supplies vital whole life value savings when in comparability with conventional pumped methods. For a typical installation serving two tanks, like the Stocksbridge project, based mostly on an estimated 25% discount within the electrical energy consumption and lowered maintenance necessities, te-sewpas provides a 40% lower capital price and 50% reduction in operational cost compared to a pumped desludge system.
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