Understanding Microbiology of Sewage Treatment Process
Explore the fascinating world of microbiology in sewage treatment. Learn about the abundance of microorganisms in raw sewage, bacterial growth phases, and the importance of substrate availability. Discover the stages of bacterial reproduction and death in sewage treatment systems.
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Presentation Transcript
Microbiology of sewage and sewage treatment
Domestic sewage contains enormous quantities of microorganism. Bacteria counts in raw sewage may be expected to range from 50 000 to 5 000 000 / ml . In the presence od adequate food and oxygen, bacteria will reproduce as illustrated in the figure below
Log phase: it represent the time required for the organism to acclimate to their new environment Log phase: this phase coincides with the max rate of substrate removal.
Declining growth: this phase represents decreasing of growth phase Stationary phase: here the population remains stationary because the growth of new cells is offset by the death of od cells.
Increasing death phase; in this phase the death rate of bacteria begins to increase Log death phase : in this phase the death rate of bacteria exceeds the production of new cells Death: in this phase the substrate is depleted and the bacteria die due to lack in substrate.
