Advanced waste water treatment in small sewage plants with less than 50 persons

Using the technology mentioned above the purification efficiency concerning organic waste load and nitrogen does in no way lack behind that of modern large-sized sewage treatment plants. Investment and running cost as well as technological expenditures are comparable with sewage plants without advanced treatment.

In the course of the project EvU plc. has developed and tested a small sewage plant with biological phosphorus and nitrogen removal. This advanced treatment was carry out by the utilization of the activated sludge system combined with an aerob and respectively anoxic/anaerob moving bed biofilm system.

Microorganisms with special metabolic efficiencies concentrate in a biofilm and settle down on cylindrical carriers. These carriers forms in dependence on the intensity of air introduction an ideally mixed turbulent or fluidized bed (aerob) and in areas without aeration an anoxic/anaerobic fluidized bed. By means of a special retention system the carrier material remains in the corresponding process stage without clogging.

Results:

• Using the technology mentioned above the purification efficiency concerning organic waste load and nitrogen does in no way lack behind that of modern large-sized sewage treatment plants.
  
  
• Phosphorus was eliminated to 74% on average.
  
  
• The sludge production (excess sludge) could be decreased considerably.
  
  
• Investment and running cost as well as technological expenditures are comparable with sewage plants without advanced treatment.

Source Of Supply: The final report (call number F 00 B 519, in German) can be borrowed from:
Technische Informationsbibliothek (TIB) Hannover
Welfengarten 1B
30167 Hannover





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