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 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 improvement, the brief to Mott MacDonald Bentley (MMB) was for reliability, sustainability and low working price. The relocation additionally allowed for an upgrade from 13,000 inhabitants to 15,000 for the 2030 design horizon.
The new £15.sixty five million works consists of duty/standby fine screens, a vortex grit removal 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 in 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 important obligation, MMB selected the te-sewpas pulsed air lift pump system provided by Te-Tech Process Solutions. The self-contained unit incorporates a four.6kW duty side channel air blower, actuated air control valves, air manifold and management panel housed inside a weatherproof GRP enclosure and is delivered to site fully assembled and tested. 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 duration of desludging to be adjusted to permit the sludge to consolidate thus eliminating any potential ‘rat-holing’ and making certain consistent desludging.
The unit may be positioned near the tanks that it serves with versatile air supply hoses routed by way of ducts to each of the desludge chambers. The air delivered is hot and consequently there is no need for thermal lagging or insulation. Each te-sewpas unit can serve up to four primary or humus tanks with typical particular person air delivery hose size 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 management panel, MMB decided to combine the te-sewpas controls into the central PLC and Te-Tech supplied a useful design specification for this function. The venture was completed in October 2019. “We’ve been utilizing the air raise 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 especially robust and we decided to retrofit additional methods in place of standard progressive cavity pumps at each Stillington and Sutton-on-the-Forest.” เกจวัดแรงดันน้ำไทวัสดุ of these two systems was completed in April 2021.
Significant whole life value financial savings
The te-sewpas system supplies significant whole life cost savings when in comparison with standard pumped systems. For a typical installation serving two tanks, just like the Stocksbridge project, primarily based on an estimated 25% reduction in the electrical power consumption and lowered upkeep requirements, te-sewpas offers a 40% lower capital value and 50% reduction in operational price compared to a pumped desludge system.
Water hammer could be a main concern in pumping techniques and should be a consideration for designers for a quantity of reasons. If not addressed, it can cause a number