Mike Froom, Business Development Director for Te-Tech Process Solutions in Southampton, UK, explores the benefits of a pulsed air lift sludge pumping possibility in comparison with typical 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 significant housing development, the transient to Mott MacDonald Bentley (MMB) was for reliability, sustainability and low working cost. The relocation additionally allowed for an upgrade from thirteen,000 inhabitants to fifteen,000 for the 2030 design horizon.
The new £15.65 million works consists of duty/standby fine screens, a vortex grit removing unit and two 15.5m diameter primary settling tanks adopted by organic 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 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 selected the te-sewpas pulsed air raise pump system equipped by Te-Tech Process Solutions. The self-contained unit incorporates a 4.6kW obligation side channel air blower, actuated air control valves, air manifold and management panel housed inside a weatherproof GRP enclosure and is delivered to web site totally assembled and examined. Each pulse of air lifts a quantity 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 permit the sludge to consolidate thus eliminating any potential ‘rat-holing’ and guaranteeing constant desludging.
The unit can be situated near the tanks that it serves with flexible air supply hoses routed through ducts to each of the desludge chambers. The air delivered is sizzling and in consequence there isn’t a need for thermal lagging or insulation. Each te-sewpas unit can serve as much as four main or humus tanks with typical individual air supply hose length as much as 35m.
At Stocksbridge, a single Type B te-sewpas unit with duty/standby air blowers serves the 2 humus tanks. Rather than using the usual control panel, MMB decided to integrate the te-sewpas controls into the central PLC and Te-Tech offered a practical design specification for this purpose. The venture was accomplished in October 2019. “ เกจแรงดันน้ำ ’ve been utilizing the air raise methods of varied makes on our websites for the last 20–25 years,” says Yorkshire Water’s Wastewater Asset Planning Sponsor Jan Buczylo, “The te-sewpas is especially robust and we decided to retrofit additional methods instead of standard progressive cavity pumps at each Stillington and Sutton-on-the-Forest.” Installation of those two methods was completed in April 2021.
Significant complete life price savings
The te-sewpas system offers important complete life value financial savings when in comparison with standard pumped methods. For a typical installation serving two tanks, just like the Stocksbridge venture, primarily based on an estimated 25% reduction in the electrical energy consumption and reduced maintenance necessities, te-sewpas offers a 40% lower capital value and 50% discount in operational cost compared to a pumped desludge system.