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 standard pumped systems.
A te-sewpas unit at Stocksbridge.
When Yorkshire Water determined to relocate Stocksbridge Wastewater Treatment Works 2km to the south to allow a serious housing improvement, the brief to Mott MacDonald Bentley (MMB) was for reliability, sustainability and low working price. The relocation additionally allowed for an upgrade 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 major settling tanks followed by biological treatment in seven trickling filters with two sixteen.7m humus settlement tanks. Sludge produced within 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 first settlement tanks.
Simple, low opex sludge pumping
For this critical responsibility, MMB chosen the te-sewpas pulsed air carry pump system supplied by Te-Tech Process Solutions. The self-contained unit incorporates a four.6kW responsibility aspect channel air blower, actuated air management valves, air manifold and management panel housed inside a weatherproof GRP enclosure and is delivered to website totally assembled and examined. 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 duration of desludging to be adjusted to allow the sludge to consolidate thus eliminating any potential ‘rat-holing’ and ensuring constant desludging.
The unit can be positioned near the tanks that it serves with versatile air delivery hoses routed through ducts to every of the desludge chambers. The air delivered is scorching and consequently there is no need for thermal lagging or insulation. Each te-sewpas unit can serve up to 4 primary or humus tanks with typical particular person air delivery hose length up to 35m.
At Stocksbridge, a single Type B te-sewpas unit with duty/standby air blowers serves the 2 humus tanks. Rather than utilizing the usual management panel, MMB determined to integrate the te-sewpas controls into the central PLC and Te-Tech offered a practical design specification for this objective. The challenge was completed in October 2019. “We’ve been using the air raise methods of various makes on our sites for the last 20–25 years,” says Yorkshire Water’s Wastewater Asset Planning Sponsor Jan Buczylo, “The te-sewpas is particularly sturdy and we decided to retrofit extra systems rather than typical progressive cavity pumps at each Stillington and Sutton-on-the-Forest.” Installation of those two methods was completed in April 2021.
Forgotten -sewpas system supplies significant whole life price financial savings when in comparison with typical pumped techniques. For a typical installation serving two tanks, just like the Stocksbridge venture, based on an estimated 25% reduction in the electrical energy consumption and lowered maintenance necessities, te-sewpas offers a 40% lower capital cost and 50% discount in operational cost compared to a pumped desludge system.
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