Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 37 for “"Bulking"”.
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Development, Characterization and Application of a Reactive Bulking Agent for Wall Control
… it will be appropriate to treat it as a reactive bulking agent, hence its name: Low Density Reactive Agent or LDRA for short. When mixed with standard ANFO prills, the reactive nature of the LDRA ensures a detonable mixture regardless of the final dilution sought or the degree of segregation …
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The effect of anoxic selectors on the control of activated sludge bulking and foaming
… anoxic selectors on controlling activated sludge bulking and foaming. These experiments were conducted with two pilot plants; a three stage anoxic selector preceding a complete mix system (experimental unit) and a complete mix system (control unit). Successful selector operation requires balancing …
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Full scale demonstration of filamentous bulking control at a biological nutrient removal activated sludge plant
Includes bibliographical references.
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Causes and control of low F/M bulking in long sludge age nutrient removal activated sludge systems
… the prolific growth of :filamentous organisms (bulking), which inhibits the rate of sludge settling in the clarifier (secondary settling) stage of treatment and reduces plant throughput. To find the causes of :filament proliferation, a four-stage investigation was conducted: (1) A review of …
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Investigación sobre las causas de levantamiento de lodos biológicos en los procesos de decantación y sobre alternativas de solución
… de distintos parámetros en la formación de bulking(levantamiento de lodos). Las conclusiones obtenidas se pueden resumir como sigue: a) la edad del fango tiene importancia en la formación de bulking. Tiene un óptimo en 8'5 días. B) la carga masica tiene importancia similar. Se recomienda no …
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The effect of nitrite and nitrate concentrations on low F/M filament bulking in nitrogen removal activated sludge systems
Filamentous bulking and its associated poor sludge settleability is a considerable problem in South African activated sludge plants, as indicated by the two surveys undertaken on these plants in 1985 and 1988 (Blackbeard et al., 1986, 1988). Amelioration of this problem would enable a greater daily …
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The effect of a large anoxic mass fraction and concentrations of nitrate and nitrite in the primary anoxic zone on low f/m filament bulking in nutrient removal activated sludge systems
Filamentous bulking occurs when filamentous organisms are present in excessive numbers and extend from floes into the bulk solution. They interfere with the compaction and settling of the activated sludge either by producing a very diffuse floe structure or by causing bridging between floes. This …
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The effect of sludge age and aerobic sludge mass fraction on low F/M filament bulking in intermittent aeration nitrogen removal systems
Since 1989 a wide ranging program of research has been under way to identify the factors that effect low F/M filament proliferation. Completed work has established an important factor conducive to low F /M filament proliferation - the presence of anoxic and aerobic zones, or, alternating …
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Detection of filamentous bacteria in activated sludge
… isolate the filamentous bacteria responsible for bulking at Goudkoppies activated sludge plant in Johannesburg, South Africa, in order to allow fluorescent antibody against these microorganisms to be produced and to facilitate and simplify their identification. Of the filaments only Nocardia could …
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The effect of the type, size, position and recycle ratio of the anoxic zone on low F/M filament bulking in nitrogen removal activated sludge systems
Filamentous bulking, which causes deterioration in sludge settleability has been shown, in two nation-wide surveys to be a problem of considerable proportions. Poor sludge settleability in the secondary clarifier limits the daily flow and load that can be treated in activated sludge wastewater …
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The effect of fully anoxic conditions and frequency of exposure to anoxic and aerobic conditions on the growth of low F/M filaments in nitrogen remova
Filamentous bulking, caused predominantly by low F/M filaments (Blackbeard et al, 1986, 1988), results in considerable settling problems in full scale nitrogen (N) and nutrient (N & P) removal activated sludge plants in South Africa. The development of specific methods for control of low F/M …
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Effects of topping, stem density, and stage of vine cutting on canopy growth and tuber yield yield of potato (Solanum tuberosum L.)
… and main stem density on canopy growth, tuber bulking rate, and tuber yields of potato. Topping (3 years) and vine cutting (2 years) at 1 WAE resulted in more uniform plant stands and increased average yield of US No. 1 tubers of ‘Yukon Gold’ by 16 and 14%, compared to untopped and uncut …
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The effect of temperature on denitrification kinetics and biological excess phosphorus removal in nutrient removal activated sludge systems in temperate climates (12°C - 20°C)
Filamentous bulking in nutrient (N & P) removal activated sludge systems is a problem of considerable magnitude - three quarters of 45 plants surveyed were found to have bulking sludges to the extent that sludge settleability (DSVI) was adversely affected. If filamentous organism proliferation …
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Deficit irrigation and nitrogen rate effects on growth, yield, tuber quality and petiole nutrient dynamics in four potato cultivars grown in San Luis Valley, Colorado
… (ET) replacement, initiated post-bulking at ~60 days after planting, DAP) and two seasonal N rates (165 vs. 131 kg N ha-1, split-applied). Measurements included yield components, leaf area index (LAI), tuber bulking (TB), tuber quality traits [specific gravity (SG), starch content …
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Modeling and microbiology of a New Zealand dairy industry activated sludge treatment plant : a thesis presented in partial fulfillment of the requirements for the degree of Master of [Technology in] Environmental Engineering at Massey University
… with the causes of existing foaming and bulking problems. Excellent removal efficiencies of 99.7% BOD5, 98.8% COD, and 96.9% TKN were achieved thoughout the period studied. The removal of total phosphorus however, was only 33.8% and this may become an issue that requires attention in the …
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Factors affecting the growth of Nostocoida limicola II and other filamentous microorganisms in activated sludge systems
… of various filamentous microorganisms in the bulking activated sludge at the Hoechst Celanese wastewater treatment plant. First, futile attempts were made to isolate the filamentous bacterium, <i>Nostocoida limicola II</i>, from activated sludge for purposes of its characterization. Chemostat …
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Investigation into the start-up and operation of upflow anaerobic sludge bed reactors
… granules used as inoculum into undesirable bulking-type sludge resulted in refocusing the study to investigate the granulation process. After consulting the literature on granulation, an experimental investigation into the effect of providing additional hydraulic mixing by recycling reactor …
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An investigation of the effects of the addition of powdered activated carbon to the activated sludge of cellulose acetate manufacturing wastewater
… suspended solids. A type of activated sludge bulking, known as jelly formation, plagued the biological reactors but nitrogen addition appeared to solve the problem
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External nitrification in biological nutrient removal activated sludge systems
… for nitrification, (ii) filamentous organism bulking of the sludge that develops in the system, (iii) treatment of the P rich waste sludge from the system and (iv) containment of the large mass of P in the sludge during a failure of the aeration in the system. In order to overcome the first …
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Development of a Biosensor to Predict Activated Sludge Deflocculation, and the Link Between Chlorination and Potassium Efflux
… between chlorine addition to control filamentous bulking, increased soluble K+ levels and an increase in effluent suspended solids . The results demonstrate that the addition of chlorine to control filamentous bulking may elicit the GGKE mechanism, initiating activated sludge deflocculation, …
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