Fremgangsmåde til rensning af med biologisk nedbrydelige skadelige stoffer forurenet jord

摘要

The invention relates to a process and apparatus for removal and destruction of biologically degradable pollutants from waste waters, for example from process waters (washing waters) from soil washing processes. The invention thus also relates to a process for purifying soils contaminated by pollutants, in which biologically degradable pollutants are destroyed. The pollutants are extracted from the waste water or process water to be purified with an extraction medium, the pollutants diffuse into the extraction medium, the extraction medium laden with the pollutants is separated off from the waste water or process water and is passed into a bioreactor in which the pollutants are biologically degraded. Preferred embodiments of the process according to the invention use liquid extraction media which have a lower density than the waste water to be purified. The apparatus according to the invention contains an extraction unit (10) and, downstream of this, a unit for biological purification (14), or a device for soil washing (4), an extraction unit (10) and, downstream of this, a unit for biological purification (14).