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Journal ArticleDOI

Protozoa in biological sewage-treatment processes—I. A survey of the protozoan fauna of British percolating filters and activated-sludge plants

01 Mar 1970-Water Research (Pergamon)-Vol. 4, Iss: 3, pp 225-236
TL;DR: No real evidence was found to suggest that any particular component of industrial effluents had, by itself, any harmful effects upon the protozoan populations of activated-sludge plants.
About: This article is published in Water Research.The article was published on 1970-03-01. It has received 136 citations till now. The article focuses on the topics: Protozoa & Activated sludge.
Citations
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Book
01 Jan 1987

418 citations

Journal ArticleDOI
Paolo Madoni1
TL;DR: The SBI provides numerical values which enable the operator to monitor the prevalent plant operating conditions on a daily basis and makes it possible to define the biological quality of the sludge using numerical values of 0–10, and to group SBI values into four quality classes.

288 citations

Journal ArticleDOI
TL;DR: The presented model was used to investigate the effect of increasing sludge age and the role of predators on the biomass composition of the tested SBR system.

148 citations

Journal ArticleDOI
Paolo Madoni1
TL;DR: The Sludge Biotic Index (SBI), an index based on the structure and abundance of the microfauna inhabiting the activated sludge and mixed liquor, has been devised to monitor activated-sludge plant performance.
Abstract: Biological wastewater treatment is a process of increasing importance in a world with an ever-increasing human population. Wastewater treatment facilities are designed to maintain the high density and activity levels of those microorganisms that carry out the various purification processes. Protozoa are one of the most common components in these man-made ecosystems and play an important role in wastewater purification processes. Protozoa are responsible for improving the quality of the effluent, maintaining the density of dispersed bacterial populations by predation. Studies of the relationships between protozoa and physicochemical and operational parameters have revealed that the species structure of these communities is an indicator of plant efficiency. The Sludge Biotic Index (SBI), an index based on the structure and abundance of the microfauna inhabiting the activated sludge and mixed liquor, has been devised to monitor activated-sludge plant performance. Heavy metals and other pollutants ar...

142 citations

Journal ArticleDOI
TL;DR: Results from plate filter matings showed that bacteria present in the activated-sludge population could act as recipients for plasmid pD10 and actively expressed genes carried on the plasmID, indicating the in situ transfer of mobilizing plasmids from the indigenous population to the introduced strain.
Abstract: The possibility of the accidental or deliberate release of genetically engineered microorganisms into the environment has accentuated the need to study their survival in, and effect on, natural habitats. In this study, Pseudomonas putida UWC1 harboring a non-self-transmissible plasmid, pD10, encoding the breakdown of 3-chlorobenzoate was shown to survive in a fully functioning laboratory-scale activated-sludge unit (ASU) for more than 8 weeks. The ASU maintained a healthy, diverse protozoal population throughout the experiment, and the introduced strain did not adversely affect the functioning of the unit. Although plasmid pD10 was stably maintained in the host bacterium, the introduced strain did not enhance the degradation of 3-chlorobenzoate in the ASU. When reisolated from the ASU, derivatives of strain UWC1 (pD10) were identified which were able to transfer plasmid pD10 to a recipient strain, P. putida PaW340, indicating the in situ transfer of mobilizing plasmids from the indigenous population to the introduced strain. Results from plate filter matings showed that bacteria present in the activated-sludge population could act as recipients for plasmid pD10 and actively expressed genes carried on the plasmid. Some of these activated-sludge transconjugants gave higher rates of 3-chlorobenzoate breakdown than did strain UWC1(pD10) in batch culture.

133 citations


Cites background from "Protozoa in biological sewage-treat..."

  • ...Close monitor- important role in the activated-sludge process (12, 13)....

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  • ...the species association rating of Curds and Cockburn (13)....

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References
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Journal ArticleDOI
TL;DR: Evidence was found which suggested that the species structure of the protozoa population in activated sludge was in some way associated with the quality of effluent delivered, and a method was devised which enables the assessment of the average effluent quality delivered from a knowledge of the species present in the sludge.

147 citations

Book
01 Jan 1925
TL;DR: An account—systematic, biological, ecological—of the fauna of the North Sea and the Baltic, and is expected to be completed in about 2000 pp.
Abstract: THE series of which this forms the first section is planned to give an account—systematic, biological, ecological—of the fauna of the North Sea and the Baltic, and is expected to be completed in about 2000 pp. in three years. Each part deals with one group of animals, is separately paged, and bears a number in Roman figures and a letter, so that eventually all the parts with the same Roman figure can be placed together and bound in the sequence indicated by the letters; e.g. all the parts on Ccelenterata will be headed “III.” followed by one of the letters a-f according to the class or order—the part on Ctenophora will be marked “III. f.”Die Tierwelt der Nord- und Ostsee.G. Grimpe E. Wagler. Lieferung 1 (Teil VI. d, VII. a, XI. a). Teil VI. d: Echiuridæ, Sipunculidæ, Priapulidæ, von W. Fischer; Teil VII. a: Enteropneusta, von C. J. van der Horst; Teil XI. a: Pantopoda, von Johannes Meisenheimer. Pp. 55 + 12 + 12. (Leipzig: Akademische Verlagsgesellschaft m. b. H., 1925.) 4.80 gold marks.

143 citations