Pumping Technology
Extending the Life of Small Wastewater Plant in Switzerland
Tsurumi’s FHP decanting pumps provide a cost effective solution to limited tank capacity in small wastewater treatment plants. The pumps remove supernatant water to leave only pure sewage, reducing the overall volume of stored waste and extending the life of the plant. Iseltwald wastewater plant in Switzerland uses five FHP pumps for this very purpose. Small wastewater treatment plants do not have the luxury of excess
space. With limits on rotting tower size and even tighter limits on budgets, plants must maximise tank capacity to perform as economically as possible in the long term. Tsurumi’s FHP pumps enable plants to maximise their working life through a cost effective and easy to install solution. The pumps discharge buoyant water from sludge tanks at a predetermined depth to ensure only pure sewage is stored. “The FHP pump is unique in its operation,” explains Carsten Bode, product manager at Tsurumi Europe. “By removing clear water from the middle of the tank, it drastically reduces the volume of waste to be stored and, in turn, extends the working life of the treatment plant. The FHP’s versatility means it is suitable for any application that requires the removal of clear water from a settling but mixed wastewater solution. Our FHP pumps also have a reputation for reliability and longevity. We installed our first seven years ago and it’s still going strong.”
Iseltwald Plant
Designed to cater for a population of approximately 850, Iseltwald wastewater treatment plant in Brienz, Switzerland, consists of a 10m deep activated sludge tank and a tank for the aerobic treatment of primary sludge. A total of five Tsurumi FHP pumps are in use at the plant, four are situated in the activated sludge tank, which measures 6% solidity, and one in the aerobic treatment tank. The pumps, supported by a guide rail, float on the surface of the tanks and pump out
clear water from a preset depth of approximately 50cm. In this way, all that eventually remains in the tank is surface bubbles at the top and pure sewage at the bottom. An anti-sludge sensor
Tsurumi (Europe) GmbH, Heltorfer Str. 14, 40472 Düsseldorf, Germany Tel: +49 211 417 9373 Fax: +49 211 479 1429
sales@tsurumi-europe.com
controls the pump activity while monitoring the clarity of the discharged water to ensure no sediment is trapped in the pump. “Due to the plant’s small size, the budget for the pump installation was equally small,” explains Mr Ernst Abegglen, technical manager at the Iseltwald plant. “But with Tsurumi we found the perfect solution. The FHP pumps proved to be the most economical and easy-to-install option. And, since being installed in 2003, they have run continuously without fault. Only now are we scheduled to maintain them and even this is only standard preventative maintenance, as is required after such a long period of continual use.” RL Pumpenanlagen GmbH, general distributor for Tsurumi in Switzerland, is set to carry out the maintenance work in March 2010. Tsurumi has also provided two TRN aerators to the Iseltwald plant for the treatment of primary sludge. The aerators tackle the initial stage of wastewater treatment, separating waste from water. The aerators work in conjunction with the decanting pumps to provide a total and efficient pumping solution.
The FHP Pump
Tsurumi’s FHP series decanting pump is specially designed for the discharge of supernatant water. It can be used in numerous applications including sewage treatment, wastewater treatment and even decanting river water from a pond. The FHP pumps are designed to be
supported by a guide rail and float on the water’s surface to pump out clear water from a pre- determined depth. The pump continues to operate until a photosensor, fitted to monitor the consistency of the water, automatically switches it off. When not in use, a check ball within the pump closes the suction opening to prevent the inflow of sediment. The guide rail enables the pump to rise and fall with the water line, ensuring it remains in the optimum position and depth. The pump is fitted with a special non-clogging impeller, to withstand any intake of waste. It
also features Tsurumi’s patented double mechanical seal, which significantly reduces day-to-day wear.
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Solar Powered Recirculating Pump As part of a major project to improve treatment efficiency, NOV® Mono® (UK) has
installed a solar powered recirculating pump at Welsh Water’s Llanrhidian WwTW, a remotely located wastewater plant on the Gower Peninsular which has no power supply.
Llanrhidian WwTW, which consists of a biological filter bed and two final
tanks, was found to be drying out during long spells of dry weather, killing off the biological process that is fundamental to treatment at the site. To resolve this issue, the site planned to fit a re-circulation system from the final tank up to the filter bed that would pump around 2 l/sec of final effluent onto the filter bed and prevent the biological system drying out. However, with no power supply at the site, this presented a challenge.
NOV Mono recommended installing one of its solar panels and recirculating pumps. The Mono pump uses renewable energy from the PV solar panel to pump the effluent back to the filter bed and keep the biological process from drying out.
Mike Gillard, Capital Engineer at Welsh Water, commented: “We chose to go with Mono’s system as it offered the most cost-
effective solution for the site’s remote location. The company listened to our needs and worked with us to solve our problem in the most efficient way possible.
“We’ve also been impressed by Mono’s recent pump design innovations, which have gone a long way to solve the challenging maintenance and repair issues that we have struggled to tackle over the years.
“We are very happy with this unique solution, so much so that we are looking at how we can use the technology to resolve similar issues at other remote sites within our business.”
The installation consisted of a Mono SunSub submersible pump, solar array, controller cable and safety wire together with a GRP Kiosk to house all control components, back up batteries, pump starter for the solar unit and day/night/summer/winter timer controls. All mechanical and electrical installation was carried out by Mono’s projects and installations team.
Solar powered water pumps have been developed by Mono for use with boreholes, wells lakes or rivers where electric or
diesel power is unavailable. Installation is quick and simple, and the robust and effective design ensures maintenance is minimal, enabling the units to be serviced or repaired with basic maintenance skills and little spare parts back up.
Solar power is now more reliable and more cost effective than either windmills or diesel motors, and Mono’s equipment has been designed to withstand the toughest conditions while maintaining operation.
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For more than 60 years sera products have represented the highest measure of quality, safety and reliability in the treatment of drinking water, process water and wastewater.
Dosing and feeding pumps Dosing systems and disinfection systems Process measuring and control technology Fittings and accessories Extensive pre- and after-sales service
sera ProDos GmbH sera-Strasse 1
34376 Immenhausen . Germany Tel.: +49 5673 999-02 Fax +49 5673 999-03
www.sera-web.com
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