Mike Froom, Business Development Director for Te-Tech Process Solutions in Southampton, UK, explores the benefits of a pulsed air lift sludge pumping possibility compared to conventional 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 development, 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 £15.65 million works consists of duty/standby fine screens, a vortex grit removing unit and two 15.5m diameter main settling tanks followed by biological remedy 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 primary settlement tanks.
pressure gauge หน้าปัด 2 นิ้ว , low opex sludge pumping
For this important obligation, MMB selected the te-sewpas pulsed air lift pump system provided by Te-Tech Process Solutions. The self-contained unit incorporates a 4.6kW duty aspect channel air blower, actuated air management valves, air manifold and control panel housed within a weatherproof GRP enclosure and is delivered to website absolutely 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 permits the frequency and duration of desludging to be adjusted to allow the sludge to consolidate thus eliminating any potential ‘rat-holing’ and ensuring consistent desludging.
The unit may be located close to the tanks that it serves with versatile air delivery hoses routed by way of ducts to each of the desludge chambers. The air delivered is sizzling and consequently there is not a need for thermal lagging or insulation. Each te-sewpas unit can serve up to 4 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 2 humus tanks. Rather than using the usual control panel, MMB decided to combine the te-sewpas controls into the central PLC and Te-Tech supplied a practical design specification for this function. The project was accomplished in October 2019. “We’ve been using the air lift techniques of various makes on our sites 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 further methods rather than conventional progressive cavity pumps at both 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 provides important complete life price savings when in comparison with conventional pumped techniques. For a typical installation serving two tanks, like the Stocksbridge venture, primarily based on an estimated 25% discount in the electrical power consumption and lowered upkeep requirements, te-sewpas offers a 40% decrease capital value and 50% reduction in operational price in comparison with a pumped desludge system.