Renewal of physicochemical plant (EOC Oudenaarde)

Purpose

To realize a completely new physicochemical plant that could operate in parallel with the existing plant. The new plant had to be connected to new tanks and pumps and enable a smooth conversion. In addition, the focus was on sustainability, chemical resistance and long-term process reliability.

Problem-solution

Problem

The existing plant was obsolete and only temporarily kept operational. At the same time, the wastewater treatment plant was not allowed to be shut down, so working in parallel with an active plant was necessary. The limited space, variable wastewater flows and complex integration with existing infrastructure made the implementation technically challenging.

Solution

The solution was to realize a completely new physicochemical plant within the existing hall, built alongside the operational plant. This involved a thoughtful combination of engineering, customization and phased execution.

• In the design phase , our team accurately mapped the existing situation via 3D scanning. This allowed us to optimally fit the entire installation, including piping, tanks and supporting structures, into the limited space available. During execution, our CGK staff adjusted the design where necessary and responded flexibly to additional complexities.
  
  
• The plant includes a new piping infrastructure in stainless steel 316 (schedule 10) and plastic (PP and PE), tailored to the chemical load and variable nature of the wastewater. All chemicals arrive centrally and flow to the process tanks via a distribution system.
  
  
• Central to the process are 3 process tanks of about 40 m³, equipped with a custom-designed agitator and a sloping bottom that optimizes mixing and settling. Internal reinforcement (±40 mm) increases chemical resistance and long-term structural durability. In addition, our team provided a separate bulk storage tank for PAC.
  
  
• To ensure safety and process control, the team integrated:
  • Ventilation ducts that ensure extraction over the entire area
  • Dosing controls that accurately control the process
  • Storage tanks with hinged manholes and sight glasses for inspection
    
    
• The platforms and access structures around the tanks (gratings, profiles and ladders) are made of glass-fiber reinforced plastic (GRP). These structures provide safe and efficient access for operation, inspection and maintenance and are custom designed in accordance with EN standards.
  
  
• During the implementation phase, the team built the new plant in parallel and connected it to the existing plant in phases through controlled intakes. Through flexible connections and precise planning, the water treatment plant maintained continuous operation.

The result is a robust and future-oriented plant that perfectly matches EOC Group's process variability and operational needs.

This project is a strong example of integrated collaboration, in which our three CGK departments joined forces. Kudos to everyone who put their shoulders to the wheel!