The method of aerobic biological treatment is the method of using aerobic microorganisms to decompose organic compounds in waste water with adequate oxygen conditions, temperature, pH ... suitable.
(CHO) nNS + O2 ® CO2 + H2O + NH4 + H2S + Biological cells +D H
Under aerobic conditions, NH4 + and H2S are also decomposed by nitrification and sulphate processes by autotrophs.
NH4 + 2O2 ® NO3 + 2H + + H2O +D H
H2S + 2O2 ® SO42- + 2H + + D H
The process of aerobic biological wastewater treatment goes through three stages:
ü Stage 1:Oxidizing organic matter in wastewater to meet the energy needs of cells.
CxHyOzN + O2 ® CO2 + H2O + NH3 +D H
ü Stage 2:Synthesis of new cells
CxHyOzN + NH3 + O2 ® CO2 + C5H7NO2
ü Stage 3:Intracellular decomposition
C5H7NO2 + 5O2 ® 5CO2 + H2O + NH3 5
NH3 + O2 ® O2 + HNO2 ® HNO3
Traditional aerotank technology is the most used and oldest technology because of its effectiveness.
Traditional aerotank is an artificial aerobic biological treatment process, biodegradable organic substances are used by aerobic microorganisms as a nutrient for growth and development. Thereby, the microbial biomass is increasing and the pollutant concentration of waste water decreases. Air in the Aerotank tank is enhanced by air supply devices: surface aerators, air blowers ...
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