Bacteria are prokaryotic eubacteria, typically unicellular (without a cell membrane). Morphologically they are round (cocci), cylindrical (bacilli), curved (vibrios), spiral (spirochetes) or filamentous. Bacteria constitute the most important group of microorganisms in wastewater treatment, they use substrate in solution, they are heterotrophic or autotrophic, aerobic, anaerobic or facultative. One centimeter of wastewater can have billions of bacteria. Optimal bacterial growth generally occurs at pH between 6.5 and 7.5 and most do not tolerate pH higher than 9.5 or lower than 4.0.
Bacteria are prokaryotic eubacteria, typically unicellular (without a cell membrane). Morphologically they are round (cocci), cylindrical (bacilli), curved (vibrios), spiral (spirochetes) or filamentous. Bacteria constitute the most important group of microorganisms in wastewater treatment, they use substrate in solution, they are heterotrophic or autotrophic, aerobic, anaerobic or facultative. One centimeter of wastewater can have billions of bacteria. Optimal bacterial growth generally occurs at pH between 6.5 and 7.5 and most do not tolerate pH higher than 9.5 or lower than 4.0.
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