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becomes damaged and alerts the operator with diagnostic feedback. In addition, all of the chemicals are safety contained within the pump head, preventing operator exposure. If there is a problem, the pump head can just be changed. The twin-tube technology provides extremely low pulsation, with an offset rotor design protecting pipework integrity and providing consistent chemical supply compared with diaphragm pumps delivering similar flow rates. Unlike diaphragm pumps, the Qdos H-FLO has no valves, eliminating the issue of valves becoming stuck or blocked. In addition, the pump has a high accuracy of ±1%, which prevents chemical waste and saves costs. Wastewater treatment providers face a variety of operating challenges, including handling a wide range of chemicals, meeting high demand, and becoming more sustainable. However, with the correct pumping technology, wastewater plant managers can ensure their operations run efficiently, accurately and safely. References: 1 Earth System Science Data. Country-level and gridded estimates of wastewater production, collection, treatment and reuse. <https://essd. copernicus.org/articles/13/237/2021/> 2 Wastewater Digest. Sludge: Energy from sludge. <https://www.wwdmag.com/sludge-and-biosolids/ article/10933951/sludge-energy-from-sludge>
pump open. If both valves become stuck, then the pump can start to siphon, and the fluid will travel in the opposite direction as it can flow out of the pump. This creates inaccuracy as the fluid is leaking out. By selecting a peristaltic pump that does not require any valves, these challenges can be avoided completely. Polymers are commonly used for dewatering of sludge and solids removal from water. Solids removal helps to clean the water for reuse, while dewatering sludge minimises bulk, which can reduce costs associated with storage and disposal by up to 75%. 2 Efficient polymer activation is essential in increasing the efficacy of the polymer and minimising usage. The creation and integrity of polymer chains requires a constant stream of polymer into the dissolution stage, which can be achieved by using a low pulsation pump. If condensation gets into the source tank, then polymers can agglomerate together and block the valves of some pumps, such as diaphragm pumps. This plugs the discharge of the pump and can cause it to breakdown. This can be avoided completely with peristaltic pumps, which require no valves to operate.
wastewater industry must contend with external factors. Urbanisation means more people are living closer together in towns and cities, increasing the amount of municipal wastewater in one area. The resultant wastewater means bigger wastewater treatment works with larger processing systems are needed. Therefore, wastewater treatment providers require more powerful pumps with high flow rates and low pulsation to increase efficiency and meet demand. While diaphragm pumps meet the capacity requirements, they can only offer low pulsation when operated at low flow rates. Instead, plant managers should opt for a peristaltic pump that offers low pulsation even at high flow rates. RISING TO THE CHALLENGE After calls from plant managers for more powerful and adaptable pumping equipment that enables accurate, flexible and high-capacity dosing, the Qdos H-FLO was designed. The pump is capable of flow rates up to 600L/hr and can handle pressures up to 7bar via a range of interchangeable pump heads. The different pump heads enable the pump to be used in a range of wastewater applications and allow plant managers to respond quickly as treatment processing requirements change. The Qdos H-FLO has a pressure sensor that detects leaks and blockages. The pump stops before the system
Qdos H-FLO — chemical metering and dosing pump (Image:
Watson-Marlow Fluid Technology Solutions)
URBANISATION With the variety of different
Adeel Hassan Product manager, Watson-Marlow Fluid Technology Solutions
chemicals in wastewater treatment providing dosing challenges, the
Water & Wastewater Asia | September-October 2024 43
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