engleski

Secondary wastewater treatment

Water (H2O) is by its physical and chemical properties an unique substance in nature. These properties are of a great importance for life in general, although the chemical properties of different types of water vary. The consumption of water in the world is increasing, which causes an increase in the amount of sewage waters which pollute rivers, seas, lakes and groundwater, and thus the survival of life on earth is threatened. The industry creates wastewater in the process of production and hauseholds produce them in daily use. Such contained waters need to be purified before releasing in the watercourse. The type of purifying depends on the type and the composition of the wastewater and it can be: chemical degradation, physical degradation, physical-chemical degradation and biological degradation. The procedures of the second level of purifying of the wastewater include biological procedures in which the actions of microorganisms remove the dissolved organic and inorganic compounds and the suspended particles which remain after the primary treatment. In the secondary treatment of the wastewater, depending on the origin, for the removal of the dissolved substances aerobic and anaerobic procedures based on different relationships of microorgranisms compared to the dissolved oxygen are being applied.

physical-chemical properties of water; wastewater; purifying; aerobic procedures; anaerobic procedures.

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