The effluent is generated from the plating on connectors with elements such as Nickel, Tin, Gold and Silver with all their associated pre-treatment. At the time, Harwin was using 10m3/h of water and the trade effluent agreement was to be reviewed.
Recycling on Ion exchange resin
Because it precipitates at low pH and would eventually clog a conventional recycling system, Puretech Env. developed a solution for the selective removal of tin. The core process of the implemented solution is a recycling system based on macroporous ion exchange resin operating at 10m3/h. The resulting effluent is treated in a batch reactor which offers supreme control over the discharge as each batch is analysed before release is authorised.
Coupled with a re-arrangement of the rinse structures and an adequate stream segregation, Harwin is now discharging only 10m3 per week as opposed to 10m3 per hour and has enjoyed a 100% compliance with the new trade effluent agreement.
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