Water Air
Soil             Waste
Mechanical water treatment
The area of water focuses on water treatment. The aim of water treatment is always to re-move specific substances from the water. This can be used to clean wastewater in a wastewater treatment plant prior to discharge into a body of water. The aim of water treat-ment may also be to make water usable for a particular purpose, e.g. in the treatment of potable water.
CE 587
HM 142
CE 579
Dissolved air flotation                   Separation in sedimentation tanks Depth filtration  
Removal of solids from raw water using dissolved air flotation                                                               Solid/liquid separation in a sedimentation tank, visualisation of flow conditions                  Removal of solids by depth filtration (sand filter)                                                                                                   
Biological water treatment
The aim of biological wastewater treatment is the elimination of organic, biodegradable materials. This elimination is carried out by microorganisms which use organic substances as a source of food. This biodegradation also causes a conversion of materials to take place.
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                                                                                                                  
CE 702
Anaerobic Water Treatment
Anaerobic degradation of organic substances in stirring tank and UASB reactor for biogas production (UASB: Upflow Anaerobic Sludge Blanket)
Physical / chemical water treatment
Industrial wastewater often contains dissolved inorganic substances (e.g. heavy metals) or organic materials which cannot be biodegraded. This is also true of a lot of landfill leachate and contaminated groundwater. The use of physical/ chemical processes is ideal in such cases.
CE 583
CE 530
CE 300
Adsorption      Reverse osmosis       Ion exchange     
Adsorption of dissolved substances on activated carbon                                                      Membrane separation process for recovering the solvent from a salt solution                     Softening and desalination of water by ion exchange                                                     
CE 586
CE 584
Precipitation and Flocculation Advanced oxidation
Removal of dissolved substances by precipitation, flocculation and sedimentation of the flocs in the lamella separator Oxidation of organic substances with hydrogen peroxide and UV light                                                                                                                               
Multistage water treatment
Water to be treated usually contains several substances with different properties. Consequently, a single basic process is not sufficient to remove these substances. Water treatment plants are therefore generally built in several stages.
CE 581
CE 582
Water treatment plant 1                Water treatment plant 2
Three basic procedures of water treatment: depth filtration, adsorption and ion exchange        Two basic procedures of water treatment: depth filtration and ion exchange