Process for removing heavy metals from sewage sludges or any type of sludges

摘要

It is known to free sludges, in particular sewage sludges, from heavy metals so that they can be used as fertilisers. In order to achieve this simply with a high separation efficiency, according to the invention it is proposed that the sludges are dewatered and are then scoured, washed and dispersed in a solution of NTA or EDTA compounds and the sludge thus treated is transferred to fertiliser production. The water retained is passed through an electrolysis cell so that the metals present are separated off as completely as possible, which action is further intensified via vibration and/or ultrasonic vibration devices, so that the heavy metals are precipitated in the sump.