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THE BIOLOGICAL PROCESS OF DOMESTIC WATER
Abstract
Biological domestic water treatment is an important and integral step of wastewater treatment system and it treats wastewater coming from either residential buildings or industries. This process is used to remove any contaminants that left over after primary treatment. The biological process of domestic water treatment presented in this paper consisted in the activation of the suspended microorganisms, which consisted of two distinct operations: a) aeration, where the microorganisms are mixed with nutrients from domestic water, where oxygen is injected; b) sedimentation by separation of biomass and other solids in suspension. The result of the decomposition of organic molecules allows the maintenance of existing biomass and the creation of a new biomass from the reproduction of microorganisms. Experimental research was performed on influent and effluent samples and the following parameters were measured: pH, temperature, dissolved oxygen and alcalinity. The analysis period was 50 days. The pH was over 6.7, otherwise a reduction in the nitrification activity occurred. At temperatures over 45 В°C and below 5 В°C nitrification has not occurred. By using this method, the organic substances removed from the effluent were over 80%.
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