Biological process engineering

Water Air
Soil             Waste
Aerobic processes
Biological processes enable dissolved biodegradable substances (organic matter) to be removed from wastewater. The organic matter provides a nutrient for microorganisms, and is converted under aerobic conditions into biomass, carbon dioxide and water.
CE 701
  
CE 705
  
CE 730
Biofilm Process         Activated Sludge Process        Airlift reactor      
Biological, aerobic water treatment by the biofilm process: trickling filter                                                                 Laboratory scale wastewater treatment plant for aerobic biodegradation of organic substances                      Aerobic submerged reactor                                                                                                
Anaerobic processes
In contrast to the aerobic processes, the anaerobic degradation of organic substances takes place in the absence of oxygen. The anaerobic microorganisms use the organic substances as a source of nutrition, and so degrade them. This produces biogas, mainly comprised of methane (60%) and carbon dioxide (35%).
CE 702
  
CE 640
  
CE 642
Anaerobic Water Treatment         Biotechnical production of ethanol   Biogas plant    
Anaerobic degradation of organic substances in stirring tank and UASB reactor for biogas production (UASB: Upflow Anaerobic Sludge Blanket)      Discontinuous conversion of starch-containing bio-resources into ethanol                                                                                                               Two-stage continuous degradation of organic substances. First stage: hydrolysis and acidification, second stage: anaerobic degradation