Activated sludge

Activated sludge or activated sludge is called the accumulation of micro-organisms that break down organic matter in aerobic biological wastewater treatment. It consists mainly of bacteria, fungi and protozoa.

The activated sludge is responsible in the treatment plant during the activated sludge process for nitrification. It is important to provide especially him enough oxygen. The activated sludge is separated from the waste water after the cleaning process and reused as a sludge.

Return sludge

The return sludge (also return sludge or Rezirkulationsschlamm ) is a part of the activated sludge, which is produced in the aeration tank. This is separated from the treated wastewater in the secondary clarifier. The generally good settling properties of the activated sludge is utilized to them by sedimentation from the purified waste water to separate. Most of this sludge is fed back as a return sludge to the aeration tank. This ensures that the activated sludge concentration in the aeration tank can be maintained. The lively flakes contained in the return sludge renew the cleaning power of animation. The non- recirculated, smaller volume flow of the activated sludge is called surplus sludge.

Excess sludge

The excess sludge is the part of the activated sludge that might be taken to keeping the desired biomass concentration and pumped to the sludge treatment. This remote biomass growth is fed into a rule together with the primary sludge sludge digestion and finally the sludge dewatering.