Abstract
In the previous paper, one of the authors showed a method to determine the quantity of all filamentous organisms in activated sludge by both filament length and filament volume per unit weight of dried sludge. The former was defined as specific length of total filaments and the latter specific volume of total filaments, respectively. In this paper, relationship between these quantitative estimates and bulkiness of activated sludge was examined using activated sledges obtained from various treatment plants. The bulkiness of activated sludge was determined using Standard SVI at 20 C. Following aspects were indicated.1) Increase of filamentous organisms in activated sludge made the sludge more and more bulky.2) Specific volume of total filaments showed higher correlation to Standard SVI than specific length of total filaments did. 3) Bulking of activated sludge may occur at about 2 per cent of filament content in activated sludge organisms.
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