WASTE WATER TREATMENT PLANT
On Tuesday 10th of May we visited the municipal waste water treatment plant in Torun , one of the biggest in Poland .
The function of the waste water treatment plant is the mechanical, biological and chemical treatment of residential and industrial sewage in the area of the City of Torun , with a treatment capacity amounting to 90000m 3 /24 hours. The treatment ensures that the average concentration of sewage in the out flowing treated water and rain into the Vistula does not exceed the maximum amount specified in the project objectives and in accordance with hydro-laws. The technology applied made it possible for waste water to be treated according to European Union regulations.
Efficiency of the plant is periodically controlled by the analytic laboratory, which is situated in the area of the sewage-treatment plant.
The treatment takes place in the following phases:
- In the initial settling pump station, the sewage flowing from the area of the city is raised 7,5 m , which allows gravitational flow through all the mechanical and biological treatment machinery.
- The task of three mechanical screens is to separate solid body from the sewage.
- Waste water is carried from the screen facility to a division chamber. Here mineral suspended matter are removed. The separated sand is then taken to the municipal waste dump.
- The sedimentation of organic suspended matter onto the bottom of the settling ponds and floatation of the fluid body on the surface of the sewage takes place.
- In active sludge, bacteria take in phosphor from the sewage, which is necessary for their development.
- Nitrogen in sewage is mainly found in organic and ammonium forms. In aerating chambers, processes of nitrification and denitrification take place.
- The separation of active sludge from treated water takes place through sedimentation. The treated water is discharged into the Vistula .
- Active sludge is subjected to anaerobic fermentation. Then it is dewatered by press and disinfected with lime. As a result of anaerobic fermentation biogas is obtained. This gas is used for heating and generating electricity for the waste water treatment plant.
Our visit was very interesting, but not really suitable to ….sensitive noses!!!! |
 |
