procedures for the preparation of kunststoffpartikel containing abwaessern

摘要

Fine particles of plastic material esp. PVC are removed from waste water by (a) adding a surface active agent which can produce a foam to the waste-water, (b) subjecting the waste-water to the action of a stream of fine gas bubbles, and (c) removing the foam which has accumulated at the surface of the bath, and contains a high concn. of plastic particles by raking. Specif. the particle-contg. foam is dehydrated in a centrifuge, or by a drum filter coated with a filter aid. Practically complete elimination of the fine plastic particles from the waste water is achieved suing a relatively small amt of surface active agent.