that can be removed by flocculation La Motta et al. 2004. In thecase of Jefferson Parish, La., more than 80% of the total chemicaloxygen demand TCOD is in the form of organic particles, whileless than 20% is truly dissolved organic material. Therefore, removalof colloidal COD and suspended solids cannot be achievedunless there is successful biological flocculation and sedimentationof the well-formed floc particles La Motta et al. 2004.Unfortunately, as demonstrated by Luque 2005, due to the lowor insignificant extracellular polymer production by anaerobicbacteria, flocculation efficiency is generally poor in anaerobic environmentsand, unless there is good granular sludge formation,the effluent of anaerobic units such as the AFBR and the UASB,when processing domestic sewage, is loaded with suspended solids.Therefore, additional treatment, involving flocculation of thislarge amount of solids becomes necessary.Co
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