Cheshire, UK-nased Chemical Support Systems (CCS), which designs, manufactures, installs and commissions chemical dosing systems, has selected Watson-Marlow Fluid Technology’s (WMFTG) Qdos pumps for polymer dosing in wastewater treatment applications.
According to the company, this usage is expected to increase, as more effort is made to reduce the presence of phosphorus wastewater, which remains the most common cause of Water Framework Directive quality failure in the UK.
In the UK, over half of the country’s river water bodies and three-quarters of its lakes exceed the phosphorus discharge consent level of 0.1 mgP/litre for ‘good environmental status’. To help address these levels, a chemical coagulant or polymer is typically dosed into wastewater.
The amount of dosing depends on the amount of phosphorus present, with potential fines for those found guilty of discharges outside of set limits. In the US and Canada, for example, fines can be up to $500,000 (€450,390).
“Companies with wastewater streams are trying to achieve increasingly stringent discharge consent limits, but also want to reduce operational wastewater treatment costs,” explained Ian Bishop, co-owner at CCS. “Our chemical dosing systems, many of which rely on Qdos pumps, help companies achieve both these things.”
WMFTG’s Qdos pumps cut chemical costs through higher accuracy metering, while offering linear and repeatable low-pulse flow rates from 0.1 to 2,000 ml/minute (up to 7 bar) under a range of process conditions.
Other features include simple drop-in installation that reduces the need for ancillary equipment, with maintenance limited to a single, no-tools component replacement.
Bishop added: “When supplying a chemical dosing system to a customer, there are certain qualities we look for in a dosing pump. We use Qdos pumps predominantly for their reliability, intuitive operation, accurate dosing and ease of maintenance. If chemicals are particularly viscous, such as polymers, we find Qdos pumps even more useful.
“In our experience, using conventional diaphragm pumps for dosing high-viscosity polymers can be problematic due to blockages within the suction and discharge valves. The benefit for customers of specifying Qdos pumps is a reduction in the level of maintenance required by not having to clean and flush the associated pump head and valves on a periodic basis.”
Moreover, as certain water treatment activities demand the use of petroleum-based polymers, WMFTG recently launched its Qdos ReNu PU pumphead and tubing material, constructed of polyurethane, which makes it resistant to petroleum distillates and other aliphatic hydrocarbons.
“This tubing material has proved very reliable for specific polymer solutions containing petroleum distillates,” confirmed Bishop. Chemical containment upon pumphead failure is also assured with Qdos pumps.
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