Water & Wastewater Treatment

The PumPing STaTion - PumP and ValVe SuPPlemenT 2017 7 diaphragm pump was noticeable from the beginning," says Swain. "Since installing the Qdos pump, we have not had any more problems with block- ages." Further investment Such was the success of the peristaltic pump, that two more have since been installed at Welsh Water's Ross-on-Wye wastewater treatment plant – one as the duty pump and one on standby. These pumps run at a much lower flow rate of 8 l/h. Designed as a drop-in replacement for diaphragm pumps, Qdos peristaltic metering pumps offer long maintenance intervals, reducing the impact of process downtime and lowering total MEAN MACHINE MEAN MACHINE Vaughan Chopper pumps Mar 15.indd 1 04/03/2015 20:05 MEAN MACHINE Vaughan Chopper pumps Mar 15.indd 1 04/03/2015 20:05 MEAN MACHINE RAG, FAT, PLASTIC and other solid or fibrous debris will cause blockages, disruption and excessive downtime costs to most sewage and effluent streams. PROBLEM! There are many 'solids handling' pumps but only ONE CHOPPER pump that can provide the answer. VAUGHAN has been designed and built to perform in the most severe applications and is proven over 50 years …WHAT PROBLEM? WET WELL or DRY WELL, SUBMERSIBLE TO SELF-PRIMING… Use the right machine… A MEAN MACHINE …and there will be… NO PROBLEM. cost of ownership. They also cut chemical cost through higher accuracy (±1%) metering. In short, peristaltic pumps enable tighter WFD targets for phosphate levels. "Phosphorus is already limited to 1 or 1.25 mg/l, but the expectation within the industry is that it will soon become even stricter," says Swain. "Obviously we are dosing ferric sulphate, which means we also have to be careful that we don't fail on iron levels. This balance means we need pumps that work reliably and correctly on a continuous 24/7 basis." Environmental responsibility The Environment Agency takes samples from Welsh Water plants such as Rotherwas and Ross-on-Wye 12 times a year, checking for phosphorus, iron, ammonia, solids and more. "We have a responsibility to ensure the delivery to our watercourses is as good as it can possibly be," says Swain. "We've just done our averages for 2016 and I'm pleased to report that both Rotherwas and Ross-on-Wye are comfortably within the required P-limits. Our Qdos pumps have certainly played a significant part and Welsh Water is now considering adopting this technol- ogy at further plants." An added advantage is that Qdos pumps offer reduced maintenance with single, no-tools component replace- ment. For Welsh Water, maintenance time with the peristaltic pumps is now just a few minutes – whereas clearing a blockage from a diaphragm pump would take more than an hour, and would be required far more frequently. Qdos peristaltic pumps are designed for dosing with all types of coagulant, regardless of their viscosity, basicity, concentration and flow rate. As only the hose comes into contact with the medium, even highly corrosive and abrasive pumped media presents no problems; the pump cannot contami- nate the pumped media, or vice versa. Ultimately, with no valves or seals to wear out, clog or corrode, peristaltic pumps reduce the burden of mainte- nance. Welsh Water has recently purchased 15 further Qdos pumps for installation at its Rotherwas, Eign, Ross-on-Wye, Kington and Leominster wastewater treatment plants.

• Cover