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  • 1
    Electronic Resource
    Electronic Resource
    Problems Caused by Filamentous Bacteria in Pilot-Scale Nutrient-Removal Activated-Sludge Plants (1999)
    Oxford, UK : Blackwell Publishing Ltd
    Water and environment journal 13 (1999), S. 0 
    Details
    ISSN: 1747-6593
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Sludges from two pilot-scale nutrient-removal activated-sludge plants (a modified three-stage Bardenpho process and a Phostrip plant) were analysed and the results examined, primarily, in relation to the formation of stable foam. The survey showed that both units produced stable foam, but this did not appear to be related either to temperature or to the more conventional operational parameters (sludge age, F:M ratio). The dominance of the sludge by Microthrix parvicella was related to the amount of uronic acids in the extracellular polymers produced by the sludge. The results also indicated that (a) the addition of fermenter elutrient, which was used to produce supplementary readily degradable COD, stimulated foam formation, and (b) the degree of phosphorus removal might also be implicated in the production of foam – and requires further scrutiny.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1747-6593.1999.tb01021.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Foam Formation, Anaerobiosis and Microthrix Parvicella (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Water and environment journal 8 (1994), S. 0 
    Details
    ISSN: 1747-6593
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Microscopic examinations of the sludges associated with two incidents of foam formation in anaerobic digesters are described. In both cases, the dominant filamentous species was Microthrix parvicella. Preliminary growth studies with this species indicated that it could grow in both aerobic and anaerobic environments, but that in an anaerobic regime it did not produce polyphosphate granules. This suggests that M. parvicella may be involved in the luxury uptake of phosphate and, under strict anaerobic conditions, could compete with acetoclastic methanogens for acetate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1747-6593.1994.tb01146.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Physicochemical Aspects of Activated Sludge in Relation to Stable Foam Formation (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Water and environment journal 6 (1992), S. 0 
    Details
    ISSN: 1747-6593
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: The presence of stable foams can seriously impair the ability of an activated sludge to produce a high-quality effluent. This paper examines how the physicochemical characteristics of the solids are related to foam formation and describes how the foaming potential of full-scale plants can be assessed. It also confirms that Microthrix parvicella can exhibit a variable morphology and shows that these variations are related to the physicochemical properties that characterize foam-forming solids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1747-6593.1992.tb00758.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Development, Flood Risk and the Urban Environment: Experiences from the River Tame (2001)
    Oxford, UK : Blackwell Publishing Ltd
    Water and environment journal 15 (2001), S. 0 
    Details
    ISSN: 1747-6593
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Experience and knowledge of river-restoration schemes are generally available at the reach scale. However, there are problems with the application of this knowledge at the scale of large urbanised catchments which relate to understanding the system and predicting the impact of management strategies. This paper considers problems of developing a perceptive and efficient rehabilitation strategy for a large urbanised catchment, with specific reference to the River Tame in the West Midlands. Consideration is given to (a) rainfall-runoff relationships, (b) assessment of water quality and ecological status, and (c) predicting the impact of various management strategies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1747-6593.2001.tb00328.x
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  • 5
    Electronic Resource
    Electronic Resource
    Process Modelling at Oldham Sewage-Treatment Works Using WRc STOAT (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Water and environment journal 14 (2000), S. 0 
    Details
    ISSN: 1747-6593
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: STOAT, which is a whole-process package, was used to examine the operation of an activated-sludge process. Initially, it was calibrated at low flow conditions using data collected during a special 24-h survey, together with oxygen-transfer data and tracer-study results from earlier studies. The calibrated model was then used to (a) predict the values of the main operational characteristics for the plant, and (b) compare them with the data collected during a second special survey which, by chance, coincided with high flow conditions. This comparison showed that, to achieve a reasonable match between the modelled and measured data, it was necessary to adjust some of the model parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1747-6593.2000.tb00220.x
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Operational Aspects of Three ‘Selectors’in Relation to Aeration Tank Ecology and Stable Foam Formation (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Water and environment journal 7 (1993), S. 0 
    Details
    ISSN: 1747-6593
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: The use of ‘selectors’to control the filamentous bacteria which promote bulking in activated sludge is a well-established concept. However, their use as a control measure for stable foams is still to be optimized. This paper presents the results of a preliminary investigation into the use of selectors at three sewage-treatment works where stable foams occurred regularly. Chemical and biological data are reported together with the redox potentials in the selector zones. Taken overall, the results suggest that selectors cannot be designed or built on an ad hoc basis if the foam-producing filaments are to be controlled.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1747-6593.1993.tb00849.x
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Aspects of the Behaviour of Filamentous Microbes in Activated Sludge (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Water and environment journal 10 (1996), S. 0 
    Details
    ISSN: 1747-6593
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Filamentous bacteria tend to be an integral part of the activated-sludge floc, and they can impart characteristics to the sludge which have an adverse effect on the sludge properties, resulting in poor settlement or the formation of stable foams. Both can result in the discharge of excess solids in the final effluent. This paper examines (a) the different types of filament in activated sludge, (b) the problems which they cause, and (c) the options which may be used to reduce the impact of the problems. In particular, it examines the problems associated with the species Microthrix parvicella, the use of selectors and the interactions which can occur in sludges dominated by this species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1747-6593.1996.tb00047.x
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    A further examination of mass flux theory as applied to activated sludge settlement (1982)
    Springer
    Biotechnology letters 4 (1982), S. 381-386 
    Details
    ISSN: 1573-6776
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The use of mass flux analysis has become well established for the design of settlement tanks. Recent work has suggested how this type of analysis might be used for operational control. This paper proposes a generalised expression which would enable the hindered settling velocities of activated sludge to be calculated for specific settlement (SSVI) values and mixed liquor concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00135426
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Nutrient conditions in relation to bacterial flocculation, extracellular polymer production and sludge settlement (1983)
    Springer
    Biotechnology letters 5 (1983), S. 761-766 
    Details
    ISSN: 1573-6776
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Three bacterial species (one flocculent, one non-flocculent and one filamentous) were grown in pure culture under varying conditions of dissolved oxygen and nutritional balance. 60 hour growth samples were harvested and the extracellular polymer extracted. The analytical data from the fermentation and the extracted polymer were used to explain how the presence of the bacteria in activated sludge might affect the settlement of that sludge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01386498
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    The physical characteristics of anaerobic granular sludges in relation to their internal architecture (1995)
    Springer
    Antonie van Leeuwenhoek 67 (1995), S. 103-110 
    Details
    ISSN: 1572-9699
    Keywords: UASB granules ; granule structure ; granule strength ; extracellular polymer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A range of granular sludges was taken from industrial anaerobic sludge blanket reactors treating a wide variety of wastewaters and a comparison was made between the polymers which were extractable from the granules and their internal structures. The study of the internal structure, using sequential staining of ultra-thin sections, showed the complexity of granular sludges. Much of the area was occupied by Gram-negative cells and the area which stained positive for protein was found to increase nearer the centre of the granules. This was accompanied by a decrease in the carbohydrate positive areas. Positive areas for lipid were widespread throughout the granules. Changes in the internal structure were observed when the type of wastewater treated by the granules was changed and a comparison between sludges treating the same type of wastewater showed that factors other than the nature of the substrate must be considered as parameters which will affect the structure of the granules. Although an appreciable variation in the granule strengths was noted, it was not possible to relate these differences, on an overall basis, to either the internal structure or the chemical composition of the extracted polymers. However, an examination of data for granules produced during the treatment of nominally similar wastes did suggest that there would be a relationship between polymer composition and granule strength in these cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00872198
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    Paper (German National Licenses)
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