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Home -  Methods of treating sewage - Aerobic & Anaerobic

    Method of treating sewage - Aerobic & Anaerobic

    Types Of Waste Water Treatment Plant - Aerobic & Anaerobic

    Aerobic, as the title suggests, means in the presence of air (oxygen); while anaerobic means in the absence of air (oxygen). These two terms are directly related to the type of bacteria or microorganisms that are involved in the degradation of organic impurities in a given wastewater and the operating conditions of the bioreactor. Therefore, aerobic Waste Water Treatment Plant processes take place in the presence of air and utilize those microorganisms (also called aerobes), which use molecular/free oxygen to assimilate organic impurities i.e. convert them in to carbon dioxide, water and biomass. The anaerobic treatment processes, on other hand take place in the absence of air (and thus molecular/free oxygen) by those microorganisms (also called anaerobes) which do not require air (molecular/free oxygen) to assimilate organic impurities. 1) The final products of organic assimilation in anaerobic Waste Water Treatment Plant are methane and carbon dioxide gas and biomass.

    From the summary in Table 1, it can be concluded that it is not anaerobic or aerobic Waste Water Treatment Plant, but a combination of the two types of the technologies that give an optimum 3) Configuration for those Waste Water Treatment Plant applications where the organic impurities are at a relatively higher concentration.

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    Parameter Aerobic Treatment Anaerobic Treatment
    Process Principle Microbial reactions take place in the absence of molecular / free oxygen
    Reaction products are carbon dioxide, methane and excess biomass
    Microbial reactions take place in the presence of molecular/ free oxygen
    Reactions products are carbon dioxide, water and excess biomass
    Applications Wastewater with medium to high organic impurities (COD > 1000 ppm) and easily biodegradable wastewater e.g. food and beverage wastewater rich in starch /sugar / alcohol Wastewater with low to medium organic impurities (COD < 1000 ppm) and for wastewater that are difficult to biodegrade e.g. municipal sewage, refinery wastewater etc.
    Reaction Kinetic Relatively Fast

    Relatively Slow

    Post Treatment Typically direct discharge or with filtration / disinfection Invariably followed by aerobic Treatment
    Foot Print Relatively Large Relatively Small and compact
    Smell No smell Generates foul odour
    Capital Investment Relatively High Relatively low with payback
    Technology examples Activated Sludge i.e, Extended aeration, MBR, MBBR, SAF, FAB, RBC UASBR etc