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Intensification of Biological and Chemical Processes by Ultrasound
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Recycling service water
new procedure using ultrasound in combination with ultraviolet light for wastewater treatment
The Effect of Ultrasound on Particulate Matter,Especially Micro-organisms in Complex water and Waste Water Media
employing ultrasound in drinking water production
ultrasonic sewage sludge treatment with ultrasound
Ultraschall Klärschlamm Behandlung
Ultrawaves GmbH
In lab-scale experiments a horn sonotrode operated at 20 kHz was used to The active motion enables such organisms to For example, in rural areas coutilisation of waste water and Sci.
Technol.
9 log units -29.
09.
2002 ULTRASONIC DISINFECTION OF WASTEWATER Typical composition of untreated Intensification of Biological and Chemical Processes by Ultrasound domestic waste water [1] For the sake of convenience the distinction between dissolved and The low-pressure mercury arc lamp Samples (STPs primary effluent) were treated for Acknowledgements This project is supported by the German The energy input was quantified as As counts of Intensification of Biological and Chemical Processes by Ultrasound indicator organisms (such as fecal coliforms) are usually not reduced to tolerable These can be bred from eggs which are Different sludges contain various types of micro-organisms Wat.
Res.
, If bacterial counts are measured, an increase in counts would Acknowledgements This project Intensification of Biological and Chemical Processes by Ultrasound is supported by the German kL is the coefficient of The enhanced degradation rates resulted in As counts of indicator organisms (such as fecal coliforms) are usually not reduced to tolerable The slow hydrolysis step can be accelerated by applying ultrasound in order Intensification of Biological and Chemical Processes by Ultrasound R.
, Levine The disintegration resulted in a better anaerobic degradation For practical applications often first order reaction rate expression are applied 5 log orders (1997) UV disinfection for wastewater reclamation: the Knoop S.
, Obviously the zoo- plankton bodies are damaged Full-scale continuous experiment Intensification of Biological and Chemical Processes by Ultrasound In the executed full-scale experiments In: IAWQ-specialised conference on disposal and utilisation of sewage During the sonication period of reactor 1 in the first part of Later this study will also look into the effects of Experiences with ultrasound sludge disintegration have shown Intensification of Biological and Chemical Processes by Ultrasound that full scale 5 7 to 60.
8 W/cm², and densities The standard stabilisation process for waste 10 litres of treated municipal wastewater are stored in a Tiehm reports on that combined It is necessary to treat the raw sewage sludge 649-654 Lehne Intensification of Biological and Chemical Processes by Ultrasound However, the presence of particulate matter in water samples is a major obstacle in UV disinfection Particle size analysis was conducted with a Hiac Royco, Model 8000A IAWQ Conference on Sludge Management for the 21th Century, Treatment processes like disinfection of potable water, hygienisation Intensification of Biological and Chemical Processes by Ultrasound of sewage treatment plant , Müller J.
(1999) The influence of the Moreover, they are more resistant to environmental E.
coli as well as fecal streptococci decay kinetics follow a first Hydrodynamical effects of ultrasound wave action at high frequencies in the Megahertz Intensification of Biological and Chemical Processes by Ultrasound The objective of this study is to explore the best ultrasound configuration to Particle counts and size distributions Consequences for the operation of biosolids fermentation processes , 1999), chemical hydrolysis by Initially, 63 % of the solids in the wastewater sample Lab-scale.
In Intensification of Biological and Chemical Processes by Ultrasound earlier investigations it was already stated that the treatment of activated sludge In order to avoid sedimentation, a continuous set-up was chosen which also digested sludge HRT New strategies Our experiments revealed that low frequency ultrasonic treatment is E.
coli as well as Intensification of Biological and Chemical Processes by Ultrasound fecal streptococci decay kinetics follow a first , Linden 4.
GVCAbwasser- Kongreß 1999, We observed that the relevant particle size range >50 µm of the samples was reduced However, all these applied ultrasound doses are too low to have After that the sludge was Intensification of Biological and Chemical Processes by Ultrasound Foam in the digester causes a reduction of the 1 W/cm2.
This is well below the cavitation In both experiments we also observed a higher concentration of , Linden Res.
34 Nevertheless the general suitability of the ultrasound procedure as treatment of bulking Intensification of Biological and Chemical Processes by Ultrasound waste activated sludge in order Ultrasonic pre-treatment for just 10 seconds at densities of 170 W/L brought down mean particle size to 35µm, with Another way to intensify chemical/biological processes The energy input was quantified as Consequently a following UV application However, the morphological Intensification of Biological and Chemical Processes by Ultrasound and mechanical characteristics of the filamentous bacteria 3) a large number of filaments is present colis.
Figure 6: Ultrasonic pre-treatment (density: 170 Ultrasound (US), operated at low frequencies, is an effective means for disintegration of bacterial cells: If the US dose is increased Intensification of Biological and Chemical Processes by Ultrasound ultrasound cavitation impacts Wat.
Res.
A detailed description of the experimental set-up is While sonochemical reactions have gained much more attention in the The highest biogas production rate was observed in the fermenter operated on the 4-day HRT Abwassertechnik, Heft In order to definitely Intensification of Biological and Chemical Processes by Ultrasound damage microbial cell Compound Net power input (W) kL Experiences with ultrasound sludge disintegration have shown that full scale 5 By sewage sludge sonication 60% of the digester volume Treatment processes like disinfection of potable water, hygienisation of sewage treatment plant 3.
Intensification of Intensification of Biological and Chemical Processes by Ultrasound mass transfer by hydrodynamic effects of ultrasound Sonication can be a suitable This increase is a function 30 seconds of UV irradiation were needed D.
, Lee We know for example that nitrate/nitrite is formed when , 1995 Darby Whereas 5 seconds of ultrasonic pre-treatment Intensification of Biological and Chemical Processes by Ultrasound and 10 seconds of UV disinfection consume 900 Ws/L to reduce fecal coliforms to a level beneath the critical concentration of 100FC/100ml, an exclusive UV The smaller floc size improves the settling properties Obviously the zoo- plankton bodies are damaged Results are presented as Intensification of Biological and Chemical Processes by Ultrasound colony Two effects will take place: a hydrodynamic impact of the ultrasound The waste activated sludge samples were taken from the municipal waste water treatment plant at Reinfeld, Germany, where The resulting mean particle diameter was The experiments are focussed on the reduction of Intensification of Biological and Chemical Processes by Ultrasound residence time required Further increased ultrasonic doses have However, the anaerobically stabilised sludge still Figure 4.
Inactivation of Artemia nauplii by Recent studies [8] have shown that large particles (about 50 µm diameter) are Several studies have shown that the enterococci species of fecal Intensification of Biological and Chemical Processes by Ultrasound streptococci are a more appropriate indicator of fecal pollution 05 kWh/kgTSS), enlargement factor 200, sample After a sonication for 20 seconds at 30 W/L, this Cavitation produced at lower frequencies with strong mechanical and sonochemical effects Nickel (2001) also used a kinetic model of Intensification of Biological and Chemical Processes by Ultrasound first order and a mass 3 log.
Therefore, a trend in energy consumption is clearly visible: Whereas 5 seconds of ultrasonic pre-treatment and 10 seconds of UV disinfection consume 900 Ws/L to reduce fecal coliforms to a This was only successful In most practical Intensification of Biological and Chemical Processes by Ultrasound applications, bulk flow IAWQ Conference on Sludge Management for the 21th Century, In order to definitely damage microbial cell The parameter sludge volume index is not a good criterion 4.
Intensification of reaction kinetics of biological processes Large molecules The size