Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 525692
Title Bacteriological studies on dairy waste activated sludge
Author(s) Adamse, A.D.
Source University. Promotor(en): E.G. Mulder. - Wageningen : Veenman - 75
Publication type Dissertation, internally prepared
Publication year 1966
Keyword(s) melkbewerking - afvalwaterbehandeling - waterzuivering - biologische behandeling - parasitologie - rioolafvalwaterverwijdering - zuiveringsinstallaties - milk processing - waste water treatment - water treatment - biological treatment - parasitology - sewage effluent disposal - purification plants
Categories Manure treatment
Abstract Dairy-waste activated sludge was examined for bacterial composition and response to different conditions. Strains isolated were classified mainly into three groups: predominantly coryneform bacteria (largely Arthrobacter), some Achromobacteraceae and a small groups of Pseudomonadaceae. Experiments with representative strains of the three groups confirmed the ultimate predominant position of Arthrobacter.

Two thirds of the bacteria gave a neutral reaction on Hugh and Leifson media, and more than half were not proteolytic. The activated sludge showed a ready accumulation of polysaccharides under certain nutritional conditions.

Dissimilation of the carbohydrate of the substrate started immediately after adding substrate to an aerated activated sludge suspension. This was demonstrated by a drop in pH, through accumulation of acid intermediates, and a sharp decrease of dissolved O 2 . Dissolved O 2 was estimated by a stirrer-cleaned oxygen electrode. When dissolved O 2 was still available, acetic acid accumulated; when O 2 was exhausted, lactic acid formed.

Dissimilation of the proteins usually started after the carbohydrate was exhausted and lasted longer. This meant that there may be an important discrepancy between the original and the actual C/N relation of the substrate.

Experiments with Sphaerotilus natans and Arthrobacter strains, and published data yielded an explanation of the mechanism of bulking of activated sludge.

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