Qdos Pump Technology Cuts Maintenance Time at Effluent Plant in Germany

Contributed by: PumpScout Staff

Qdos, a pump manufacturer, has greatly reduced maintenance time at the local authority effluent plant in Selters (Westerwald), Germany from 1.5 hours to just 5 minutes. The pump is being used for metering precipitants that eliminate phosphate in wastewater. The modern effluent plant purifies wastewater and treats slurry. The plant serves 9 local communities with a total population of 11,500 people.

The phosphate content of the water inflow is usually around 5-6mg/l, while the concentration after purification cannot exceed 1.6 mg/l. To make sure that this is the case, a measured amount of ferric chloride is added when the concentration of phosphates in the wastewater reaches a concentration of 1.0 mg/l.

The precipitant is able to convert the phosphate solution into insoluble phosphate compounds that can be isolated. Delivery is between 60 and 250 ml of ferric chloride per minute. Diaphragm metering pumps were used in the past, but they proved insufficient.

"The ferric chloride attacked the pump diaphragm, meaning it had to be changed every three to four months,” explains Mr Schenkelberg. “This took one of our technicians at least an hour every time and, because of the subsequent leakage of ferric chloride, almost as long again to clean the metering station."

That’s why automation experts from Siershahn-based Jonas Schaltanlagenbau GmbH were invited to help find an alternative.

"In view of the susceptibility of diaphragm pumps, we had to consider an alternative functioning principle, which brought us quickly to peristaltic pumps and the market leader Watson-Marlow, who recommended their Qdos pump,” says Benjamin Bullert, project Manager at Jonas Schaltanlagenbau.

The effluent plant decided to test the Watson-Marlow Qdos 30 metering pump. It has minimal maintenance requirements, which result in a dramatic reduction in downtime from 1.5 hours to just 5 minutes. Employees are also happy with the new maintenance intervals as the pump has already lasted for a full year.

Because the pumps have worked so well, The Selters local authority plans to purchase more Watson-Marlow Qdos pumps in 2015 for use at other locations.

Source: Watson-Marlow

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