General Sewage Technology

Treatment of fecal matter for discharge into the receiving watercourse

The desired purification of the liquid phase of mechanically pre-treated fecal matter is possible by coupling biological and adsorbent processing steps. Experimental results from a small pilot plant show that the technical realization is economically competitive. 


Various processes and facilities are used for decentralized waste-water treatment in rural areas. What they have in common is that they are built as multi-chambered ditches. Fecal matter accumulates in them and must be removed and treated regularly. The aim of this project was to check if the liquid phase of mechanically pre-treated fecal matter could be reduced to minimum level for water discharge by using biological-adsorbent methods. This was done in a small pilot plant. 

Treatment of the fecal matter takes place in two steps:

  • Biologically: The procedure is based on coupling the activated sludge biology with a whirling carrier-bonded bio-film biology
  • Adsorbent: In a reactor, materials which cannot be recycled biologically are removed from the waste water by activated carbon powder


The degradation rate for the chemical oxygen demand (COD) was 93% after biological treatment. The desired degradation rate could only be achieved continuously through the adsorbent step. 

The decomposition of ammonium-nitrogen was on the average 99%. By adding easy-to-use carbon compounds, inorganic nitrogen compounds were reduced to under 10 mg/l. 

Phosphorus elimination is possible up to 86 %. The remainder was reduced to the desired degradation level by adding a flocculent. 

The running costs of this kind of a facility can compete with current fecal sewage treatment methods.

Project Participants

Implementing Institution

EVU®-Innovative Umwelttechnik GmbH

More Project Informations

Project title:  Treatment of fecal matter for discharge into the receiving watercourse

Project number:  02WA9502/1

Project period:  1995 - 1997

Project region:  Germany (Saxony)

Project contact:

Herr Dr. Peukert

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Source: German National Library of Science and Technology Hannover (TIB)