Has the sludge expanded?
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SV90%, SVi210; sludge consistency 4300. Microscopic examination revealed some minute worms, Breviorchis suillus, and an increase in filaments. The COD of the effluent is around 80, while the DO level is about 2. The sludge is yellow-brown in color. The inflow volume is 150 tons, and the reflux volume is 300 tons. It uses a Carrousel oxidation ditch, with sludge retention time of 6 days. 50 tons of clean water have been added to the oxidation tank now. Please help – what’s going on? Normally 40–50% SV40
Appearance of rotifers: good sludge flocculation effect； Few free and small bacteria ； It can indicate the entry of toxic inert substances. Appearance of metazoan pigs [Bdelloid rotifers, etc.]: in the early stage of excessive sludge aging ； Settling quickly, with a turbid supernatant and many fine flocs that do not settle. Diagnosing faults by combining SVI measurement with microscopic examination: A high SVI value (10–150) indicates sludge bulking; microscopic examination reveals a large presence of filamental bacteria. An excessive sludge return ratio is indicated by microscopic examination showing that the activated sludge has a high load, with small and pale floc structures, and relatively more non-activated sludge organisms present. The color of aerobic activated sludge is determined by the aerobic bacteria and the metabolic products they produce; it is generally earthy yellow in color