The volumetric mass transfer coefficient and the power number are some of the most important parameters in engineering; they are needed to scale up the equipment and/or processes. Besides, the volumetric mass transfer coefficient (kLa) for the different operational conditions (aeration and agitation rates) were obtained in the culture medium free of microorganisms and for the fermentation, such conditions were found for the most production of bikaverin. The Reynolds number and the power were determined for different treatments in bioreactor. The results in the bioreactor showed that high speed of Agitation Equipment and low aeration rate favor bikaverin production, the highest production was 112.23 mgL-1 with the condition of 0.1 vvm and 500 rpm was found on the average kLa during the fermentation of 41.42 h-1, whereas, to the culture medium without microorganisms the kLa increases proportionally to the increase of the agitation and aeration rates.
Divided by the way of mixing self-stirring, forced mixing two. Self-descending mixer is the mixture placed in a rotating drum, with the drum rotation, the drum of the mixture to a certain degree of lifting the mixture, and then free to fall down by their own weight. Repeat this way until the mix well. This mixer generally mixes plastic and semi-plastic concrete. Mandatory mixer is a stirring drum does not move, but by the drum shaft rotating blades are forced to stir. This mixer mixing quality, high production efficiency; but the power consumption, and the blade wear fast. Generally suitable for mixing dry hard concrete.
The influence of mechanical disintegration of excess sewage sludge on the performance of centrifugal dewatering and filtration was investigated. Examining different methods of mechanical cell disintegration, the best results were obtained using a high-pressure homogenizer. As a result of disintegration the dry solids content of the dewatered sludge increases when applying centrifugal forces. In the case of unconditioned sludge separated by using a beaker centrifuge this can be explained by the large portion of organic components that can be found in the centrate, whereas a high degree of the inorganic components can be found in the sediment. By adding conditioning agents the organic components are flocculated while the disruption of the particle structure leads to an increase in conditioner-demand. A dual conditioning using ferric salts and polymer led to the lowest dosage and the best dewatering results. Thickening Equipment results (using a decanter) are improved for disintegrated sludge that may be caused by a different floc structure.
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