Wastewater Treatment

Sensitive coastal region had to be taken into account when building a wastewater treatment plant for a pharmaceutical manufacturing company

High chlorine content in effluent waters creates additional requirements


  • High chlorine content in effluent waters creates additional requirements, especially when the plant is located in a sensitive coastal region

  • The most cost-efficient way to prevent the risk of corrosion is to use duplex stainless steel for wetted parts

Optimization of wastewater treatment process


A new customer had an ongoing project to build a wastewater treatment plant to take care of effluent water from a pharmaceutical manufacturing company located in a remote site in a sensitive coastal region.

The customer needed 6 agitators installed in concrete basins. Due to the higher chlorine content in the effluent waters close to the sea, the typical construction materials were seen as a potential corrosion risk. Furthermore, the customer had additional requirements for high-level variations ranging down to a very low liquid level.


The main pumping impeller choice was an axial-flow high-efficiency impeller, which ensures a good pumping rate already at a low power insert.

Our solution was to add an additional bottom stabilizing turbine in order to enable the agitator to operate regardless of the liquid level. According to the customer’s feedback, one of the most important criteria when selecting UTG as the supplier was the duplex stainless steel material we offered combined with a broad operational range for liquid levels.

We also selected a rigid design featuring agitator gearboxes without external bearings, which proved to be a cost-effective alternative also for this specific agitator size. The solution utilized UTG’s extensive knowledge of materials and experience in challenging steel grade manufacturing for a full duplex stainless steel design.


A UTG expert was sent to the site to inspect the requirements and define specifications accordingly in collaboration with the customer. After reaching a mutual understanding of the optimal solution, the agitators were manufactured and delivered according to the agreed schedule. When delivered to the site, a UTG expert provided on-site supervision of the installation. The customer also gave recommendations for how to attach the agitators to the concrete roof of the tanks by means of special assembly flanges.


After a period of test trials in the effluent treatment plant, the agitators have now been taken into full-scale operation. The agitator performance has been according to the set requirements and expectations. According to the feedback we have received, the customer has been especially satisfied by UTG’s project handling and communication.


Contact person from UTG for further information:

Mattias Gripenberg
Sales Manager

+358 400912792


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