Drinking water treatment plant to remove herbicide
The waterworks of a municipality in Northern Germany supplies approx. 5000 households and companies with a total of 1.2 million m³ of drinking water annually. As part of a routine testing program in July 2011 the raw water was tested for the rst time for ethidimuron (a crop protection agent that was used for weed control until 1990). It was found that the water contained an ethidimuron concentration of up to 3,0 g/l. The legal limit is 0,1 g/l. The waterworks was taken out of service as a result.
In April 2012 a tender was issued for an extended treatment plant based upon activated carbon ltration to remove ethidimuron.
NUMBERS & FACTS:
• Location: Waterworks in Germany
• Plant capacity: 2 x 100 m³/h
• Task: Construction of a fully automated plant to eliminate ethidimuron (herbicide).
• Scope of Supply: Process design, planning, manufacture, supply and fully operational hand-over of the complete plant
• Construction and commissioning autumn/winter 2012.
A fter a short construction period this specialised plant was put into operation in autumn of 2012. Since then the fully automated plant ensures that this herbicide is safely retained and high-quality drinking water is delivered. The now completely treated water is also subjected to UV treatment prior to feeding it into the potable water mains.
A special feature of this plant is that all filter components, fittings and control systems are installed inside of the cylindrical shell located underneath the fillter vessel. Therefore no additional housing for this plant was necessary. The filter vessels were manufactured at Chriwa’s own filter production facility in Hambühren.
