Two Bredel 50 hose pumps have been installed at a Waste Water Treatment Works in the UK, significantly improving system performance at the site. The pumps were installed and have delivered trouble-free operation since installation.
Prior to the installation of the hose pumps, auto-desludging of the primary tanks at the site was operated by timer-controlled automatic actuated valves. Engineers found the valve technology difficult to control and sludge quality was far from consistent. “By their very nature, the timer controlled actuated valves opened fully for the set time period resulting in variable sludge consistency.
Either too much water content resulted at the primary sludge holding tank or insufficient desludging resulted in blanket carry over at the primary tanks” said Dave Hughes. “We took the decision to replace the valves with two Bredel 50 hose pumps, one for each tank – each of which currently produces approximately 7 cubic metres of sludge/day.
Since installation, the Bredel 50 pumps have not only required minimal routine maintenance, but have desludged at the specified rate without interruption to flow or ‘rat-holing”.
The hose pumps installed handle 3-5% dry solids content primary sludge at a transfer rate of 2500 litres/hr. Each pump runs at 16 RPM and has a discharge pressure of less than 5 bar.
The pumps were installed complete with associated pipework and valves, and are fitted with automatic cut-out switches to protect against blockages in the suction or discharge lines and burst hose protection. Suction and delivery lines are also fitted with surge dampers.