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Assessment of Microbial Populations in Activated Sludge Using an Organism Diversity Index (2002)

Burgess, J. E. ; Mayhew, M. E. ; Stephenson, T. ; [et al.]

Oxford, UK : Blackwell Publishing Ltd

Water and environment journal 16 (2002), S. 0

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ISSN: 1747-6593

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Energy, Environment Protection, Nuclear Power Engineering

Notes: An organism diversity index for use with mixed liquor or wastewater samples was developed to assess the species richness and diversity of activated sludge. The index was used in several studies and was found to be fast and simple to perform using basic laboratory equipment. Two bench-scale and two pilot-scale studies found that the resulting ‘organism diversity index’value was a good indicator of process performance and was not influenced by the total concentration of the mixed-liquor suspended solids but by their nature alone. The technique rapidly yielded pertinent information about the health of the sludge and could be used instead of genetic investigations to obtain population information quickly enough for wastewater-treatment plant process control.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1747-6593.2002.tb00366.x

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Vitamin addition: an option for sustainable activated sludge process effluent quality (2000)

Burgess, J E ; Quarmby, J ; Stephenson, T

Springer

Journal of industrial microbiology and biotechnology 24 (2000), S. 267-274

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ISSN: 1476-5535

Keywords: Keywords: vitamins; activated sludge; industrial wastewater; porous pots; Amtox™

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology

Notes: The process performance and metabolic rates of samples of activated sludge dosed with vitamin supplements have been compared. After initial screening, four vitamins and two metals as single supplements and in pairs, were dosed continuously into the mixed liquor of an activated sludge simulation. Toxicity, oxygen demand removal, respiration rates and suspended solids were measured to monitor the effect on process efficiency. It was confirmed experimentally that an industrial wastewater stream did not contain a sufficient supply of micronutrients for efficient biological treatment. This was concluded from the observation that control sludge batches (receiving no supplements) averaged chemical oxygen demand removal efficiency of 58%. Dosing micronutrients into the mixed liquor produced removal efficiencies of up to 69%. Some of the supplements increased the respiration rate of the sludge while some decreased it, indicating a range of stimulatory and inhibitory effects. Complex interactions between micronutrients that were dosed simultaneously were evident. Several positive effects led to the conclusion that micronutrients have the potential to optimise process performance of activated sludge plants treating industrial wastewater. The addition of phosphorus/niacin and molybdenum/lactoflavin removed wastewater components that were toxic to nitrifiers as indicated through toxicity testing, thus protecting downstream nitrification/denitrification treatment processes. Journal of Industrial Microbiology & Biotechnology (2000) 24, 267–274.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1038/sj.jim.2900817

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Nondormant mutants in a temperate tree species, Corylus avellana L. (1985)

Thompson, M. M. ; Smith, D. C. ; Burgess, J. E.

Springer

Theoretical and applied genetics 70 (1985), S. 687-692

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ISSN: 1432-2242

Keywords: Dormancy ; Hazelnut ; Corylus ; Inheritance

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Summary Nondormant mutants in hazelnut (Corylus avellana L.) are described. In contrast to normal trees in which physiological rest, or dormancy, is induced by short days, mutants fail to respond to this stimulus. Shoot tips continue to grow, old leaves are retained until midwinter when they are frozen and/or pushed off by developing axillary buds, axillary buds begin to grow in December, 2–3 months before normal spring bud break, and cold hardiness does not develop. Nondormancy is controlled by a single recessive gene (dd). The mutation is not uncommon since eight cultivars, including the world's most important commercial cultivars, are heterozygous for this trait. The implications of nondormancy in a temperate tree species are discussed in relation to evolution, extension of the range of cultivation, breeding, and value for basic studies of fundamental mechanisms of dormancy.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00252298

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