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Neutralisation is necessary for successful wastewater treatment in a wide range of applications. A correctly adjusted pH value is vital for almost all wastewater treatment processes. Only neutral wastewater with a pH between 6.5 and 9.5 may be discharged into the sewage system. Acidic or alkaline wastewater must therefore be neutralised beforehand.
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Which wastewater must be neutralised in industrial wastewater treatment?
- spent acids and bases
- rinse water and washwater containing metal salts
- acidic rinse water from pickling processes in metal surface treatment
- alkaline rinse water from pickling processes in metal surface treatment
- alkaline degreasing liquids from pre-treatment or cleaning of metal surfaces
- alkaline washwater from paint stripping
- active baths and rinsing baths from galvanic processes/wastewater from electroplating processes
- acidic phosphating baths and their rinsing baths
- pH adjustment for heavy-metal precipitation
- pH correction during the final pH check before indirect discharge