منابع مشابه
The Rôle of Protozoa in the Activated Sludge Process
years prior to the activated sludge researches which date from the work of Fowler and Mumford on the bacterial clarification of sewage employing a new iron bacterium, 1 MyQuite recently Heukelekian (1941) has reviewed the present state of our knowledge of mechanical flocculation and bioflocculation of sewage, and concluded that the flocculation is brought about both by physical and biological a...
متن کاملInfluence of different anoxic time exposures on active biomass, protozoa and filamentous bacteria in activated sludge.
Medium-sized wastewater treatment plants are considered too small to implement anaerobic digestion technologies and too large for extensive treatments. A promising option as a sewage sludge reduction method is the inclusion of anoxic time exposures. In the present study, three different anoxic time exposures of 12, 6 and 4 hours have been studied to reduce sewage sludge production. The best ano...
متن کاملNutrient removal from activated sludge mixed liquor by wastewater protozoa in a laboratory scale batch reactor
The aim of the study was to investigate the nutrient removal rate of three wastewater protozoan isolates (Aspidisca, Trachelophyllum and Peranema). The study was carried out in a laboratory-scale batch reactor for a period of 120 h. in a four batch study. Aliquot samples were withdrawn from the reactor every 24 h. for the analysis of phosphate, nitrate, nitrite, ammonia, chemical oxygen demand,...
متن کاملDevelopment of an image analysis procedure for identifying protozoa and metazoa typical of activated sludge system.
A procedure for the semi-automatic identification of the main protozoa and metazoa species present in the activated sludge of wastewater treatment plants was developed. This procedure was based on both image processing and multivariable statistical methodologies, leading to the use of the image analysis morphological descriptors by discriminant analysis and neural network techniques. The image ...
متن کاملNew approaches to minimize excess sludge in activated sludge systems.
This paper presents three new approaches to reduce excess sludge production in activated sludge systems: 1) modification of conventional activated sludge process with insertion of a sludge holding tank in the sludge return line; 2) chlorination of excess sludge so as to minimize excess sludge production; and 3) utilization of a metabolic uncoupler, 3, 3', 4', 5-Tetrachlorosalicylanilide (TCS) t...
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ژورنال
عنوان ژورنال: Japanese Journal of Water Treatment Biology
سال: 1968
ISSN: 0910-6758,1881-0438
DOI: 10.2521/jswtb.4.2_12