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    Now, let’s compare this with the biological wastewater treatment process. The product is the organic load to be removed

    by means of wastewater treatment; the trained workers and tools are equivalent to the carrier media and biomass in the

    wastewater treatment process, respectively. Similar to the workers who cannot pack and ship out the products without tools,

    the carrier MBBR media cannot remove the organic

    load from the wastewater without biomass.