Microbiological study of ten New Jersey rotating biological contactor wastewater treatment plants

J. C. Chung, P. F. Strom

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14 Scopus citations


Biofilm samples from 10 RBC plants in New Jersey were examined microscopically for filamentous bacteria, protozoa, and metazoa. Statistically significant differences in types and numbers of were observed among the different plants, among the stages within a single plant and between samples collected from the periphery and from 107 cm inside the units. There were also differences in organisms between RBCs and two parallel activated sludge or one trickling filter systems. The filamentous bacteria observed were similar to those previously found in activated sludge but in a much different order of abundance (number of plants in parentheses): Beggiatoa (9), Sphaerotilus (8), Type 0041 (4), Type 1701 (2), Nocardia (2), and Type 021N (2). The flagellate, Bodo (9), was the most commonly observed protozoan. At least one type of free-swimming (7) or stalked (9) ciliate was observed in most plants. Epistylis (6) was most common. Nematodes (9), rotifers (9), and annelid worms (8) were frequently observed. The occurrence and abundance of many of the specific microorganism types appeared to be related to organic loading and/or dissolved oxygen.

Original languageEnglish (US)
Pages (from-to)35-43
Number of pages9
JournalResearch Journal of the Water Pollution Control Federation
Issue number1
StatePublished - 1990

All Science Journal Classification (ASJC) codes

  • Pollution


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