Upgrade activated sludge plant

FIGURE 21.11 Process flow diagram of upgrade activated sludge plant at apaper mill using a DAF cell. 

For waste treatment rather than fermentation for product formation, again few examples of process economics exist in the literature. Those that do, favor fluidization. Badot et al. (1994) described an industrial prototype fluidized bed reactor that competed favorably on an economical basis with activated sludge processes for treating carbon pollution and was estimated to be economically comparable to fixed bed processes for denitrification. Schneeberg (1994) described the successful and economically-sound implementation of fluidization as an upgrade to an existing wastewater treatment plant. The restricted space available for extension of the wastewater plant made fluidization particularly advantageous in this case. 

The vendor claims that Mixflo is an economical option for capacity expansion and emission control at wastewater treatment plants. According to the vendor, upgrading air-based activated sludge treatment systems with Mixflo can reduce energy costs by greater than one third (D22912J,... 

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