Table 5 - Effect of glutaraldehyde biocide on laboratory-scale rotating biological contactors and biocide efficacy

Table 5. Viability of re-established biofilms of the RBCs receiving the wastewater A and B and untreated biofilms of the control RBC.

Viability	Control RBC	RBC receiving wastewater A	RBC receiving wastewater B
TVC of biofilms (log cfu cm^-2)	7.89 ± 0.52	6.39 ± 0.39	5.11 ± 0.55
TVC of planktonic cells (log cfu ml^-1)	6.57 ± 0.57	5.90 ± 0.42	4.19 ± 0.46
Wastewater A = the wastewater containing the mineral salts and 180 ppm glutaraldehyde. Wastewater B = the wastewater containing only 180 ppm glutaraldehyde. *The results are expressed as mean and standard deviation during steady state.