Factors Affecting Performance

Factors affecting the performance of submerged attached growth bioreactors are similar to those affecting the performance of other biological treatment processes. Those particularly important to these bioreactors include the total organic loading, the substrate flux and surface loading, the hydraulic loading, and the SRT.

21.2.1 Total Volumetric Loading

As with other attached growth bioreactors, the total volumetric loading is calculated as the mass of substrate applied to the bioreactor per unit time divided by the media volume. When the substrate is organic matter, the total volumetric loading is the TOL. Consequently, it is calculated with Eq. 19.1.

The performance of packed and fluidized bed bioreactors has traditionally been characterized by graphical relationships between the TOL and the removal efficiency. Figures 21.9 through 21.12 provide examples of such relationships for packed bed bioreactors treating municipal wastewater to achieve a variety of treatment goals. Figure 21.9 illustrates the relationship between the TOL (based on total chemical oxygen demand [COD]) and the effluent total COD concentration for twelve full-scale facilities and demonstrates the typical decrease in effluent quality (increased effluent total COD) observed with increasing TOL/ Performance could also be characterized by using the removal efficiency, where a decrease in efficiency would be

Figure 21.9 Effect of total organic loading (TOL) on effluent COD concentration. The data are from twelve full-scale DFPB and UFPB bioreactors containing fired clay media. (From J. P. Canler and J. M. Perret, Biological aerated filter: assessment of the process based on 12 sewage treatment plants. Water Science and Technology 29(10/11): 13-22, 1994. Copyright © Elsevier Science Ltd.; reprinted with permission.)

Total Organic Loading, kg COD/(m3day)

Figure 21.9 Effect of total organic loading (TOL) on effluent COD concentration. The data are from twelve full-scale DFPB and UFPB bioreactors containing fired clay media. (From J. P. Canler and J. M. Perret, Biological aerated filter: assessment of the process based on 12 sewage treatment plants. Water Science and Technology 29(10/11): 13-22, 1994. Copyright © Elsevier Science Ltd.; reprinted with permission.)

0 2 ~ 04 0.6 0 8 1 1.2 1.4 Total Nitrogen Loading, kg N/(m3day)

Figure 21.10 Effect of total nitrogen loading (TNL) on TKN removal efficiency during combined carbon oxidation and nitrification (COD/TKN = 10). The data are from twelve full-scale DFPB and UFPB bioreactors containing fired clay media. (From J. P. Canler and J. M. Perret, Biological aerated filter: assessment of the process based on 12 sewage treatment plants. Water Science and Technology 29(10/11): 13-22, 1994. Copyright © Elsevier Science Ltd.; reprinted with permission.)

0 2 ~ 04 0.6 0 8 1 1.2 1.4 Total Nitrogen Loading, kg N/(m3day)

Figure 21.10 Effect of total nitrogen loading (TNL) on TKN removal efficiency during combined carbon oxidation and nitrification (COD/TKN = 10). The data are from twelve full-scale DFPB and UFPB bioreactors containing fired clay media. (From J. P. Canler and J. M. Perret, Biological aerated filter: assessment of the process based on 12 sewage treatment plants. Water Science and Technology 29(10/11): 13-22, 1994. Copyright © Elsevier Science Ltd.; reprinted with permission.)

w cp flj

Was this article helpful?

0 0

Responses

  • larry
    What are the factors affecting a bioreactor's performance?
    2 years ago

Post a comment