Suspended growth systems

The reac tor concepts described above can be utilized with any of the electron acceptor systems previously discussed, although some reactor types perform better with specific electron acceptors. For example, suspended growth systems are generally superior to fixed film systems when molecular oxygen is the electron acceptor because it is easier to supply oxygen to suspended growth systems. 

Residuals Produced. The residuals produced from suspended growth systems are the excess biomass produced as the result of biodegradation. In general, this biomass can be disposed without further treatment. However, site-specific conditions may require stabilization prior to disposal. 

Residuals Produced The residuals produced in a fixed-film reactor are normally small when compared to the residuals produced in a suspended growth system. There can be some sloughing of biomass during system ojjerations, and this may need to be separated from the effluent. The residuals, depending on site-specific requirements, may require additional treatment prior to ultimate disposal. 

FIGURE 11.9. Single-sludge suspended growth system for nitrification. 

In cases with a significant potential for toxic and inhibitory substances in wastewater, a doublesludge suspended growth system may be considered (see Figure 11.10). This consists of two aeration... 

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