The invention relates to a cleaning device for highly loaded waste water, comprising an anaerobic fixed bed filter (20) operated in upflow mode, an electroflocculation cell (50) hydraulically connected to an overflow of the fixed bed filter, said cell having a movable iron granulate anode, and a microflocculate pump (60) being hydraulically connected to an outlet of the electroflocculation cell (50), the microflocculate pump being configured in order to pump a partial stream of the iron-containing microflocculate formed in the electroflocculation cell (50) directly back into the anaerobic fixed bed filter (20).
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