Mike Froom, Business Development Director for Te-Tech Process Solutions in Southampton, UK, explores the benefits of a pulsed air raise sludge pumping possibility compared to typical pumped methods.
A te-sewpas unit at Stocksbridge.
When pressure gauge decided to relocate Stocksbridge Wastewater Treatment Works 2km to the south to allow a major housing improvement, the temporary to Mott MacDonald Bentley (MMB) was for reliability, sustainability and low working price. The relocation additionally allowed for an upgrade from 13,000 population to fifteen,000 for the 2030 design horizon.
The new £15.sixty five million works consists of duty/standby nice screens, a vortex grit elimination unit and two 15.5m diameter main settling tanks followed by biological 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 important responsibility, MMB chosen the te-sewpas pulsed air carry pump system provided 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 inside a weatherproof GRP enclosure and is delivered to web site totally assembled and tested. Each pulse of air lifts a amount of sludge and discharges it from the sludge discharge pipe. A programmable timer within 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 ensuring constant desludging.
The unit may be situated close to the tanks that it serves with flexible air supply hoses routed by way of ducts to every of the desludge chambers. The air delivered is hot and consequently there isn’t any want for thermal lagging or insulation. Each te-sewpas unit can serve as much as 4 main or humus tanks with typical particular person 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 two humus tanks. Rather than using the usual control panel, MMB decided to combine the te-sewpas controls into the central PLC and Te-Tech offered a useful design specification for this purpose. The challenge was completed in October 2019. “We’ve been utilizing the air raise systems of varied 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 methods in place of conventional progressive cavity pumps at each Stillington and Sutton-on-the-Forest.” Installation of those two systems was completed in April 2021.
Significant complete life cost financial savings
The te-sewpas system provides significant entire life price financial savings when in comparability with standard pumped systems. For a typical installation serving two tanks, just like the Stocksbridge challenge, based on an estimated 25% discount within the electrical energy consumption and lowered maintenance requirements, te-sewpas provides a 40% lower capital price and 50% discount in operational value compared to a pumped desludge system.
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