Liquid waste treatment: can combined biological processes be really effective?

摘要

1. 1st scenario clearly determined as heterogeneous characteristics of liquid wastes are often a limiting factor for biological treatment. OUR and AUR tests demonstrated to be extremely useful for highlighting the possible inhibition of the activated sludge. 2. 2nd scenario highlighted as the synergy amongst UASB and ASP was effective. Even feeding the 100% of UASB effluent, the ASP did not show relevant criticisms in the removal of both COD and ammonia. 3. 3rd scenario provided interesting results regarding the synergy of advanced and conventional processes. This combination demonstrated to be really effective for the treatment of liquid wastes as long as the feed water was characterised by 30% of thermophilic effluent and 70% of sewage wastewater (above this ratio, nitrifying bacteria were inhibited, despite a slight decrease of COD removal).