Abstract
An objective index, the Sludge Biotic Index (SBI), based on the microfauna associated with activated-sludge mixed liquor, has been devised to monitor activated-sludge plant performance. The proposed method makes it possible to define the biological quality of the sludge using numerical values (biotic index) of 0–10, and to group SBI values into four quality classes. The method is based on two principles. First, the dominance of the microfauna keygroups changes in relation to the environmental and operational conditions of the plant. In particular, some protozoa such as small flagellates and the ciliates Vorticella microstoma and Opercularia spp have a negative influence on the index value. Secondly, the number of morphological species is reduced as the performance of the plant gets worse. The advantage of this method over other schemes is that it provides numerical values which enable the operator to monitor the prevalent plant operating conditions on a daily basis.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
