Anaerobic digestion using a fixed-bed reactor with bacteria immobilized by polyacrylate on a saddle-shaped slag support - Yang, M.; Yoshimura, M.; Okada, M.; Nagai, S.; Sunahara, H. (Elsevier)
Anaerobic bacteria were immobilized by polyacrylate, which was cross-linked with Ca^2^+ ion, on a saddle-shaped slag support. The substance diffusion characteristics were improved because of a thin polymer gel layer only 0.95 mm in thickness. After immobilization, the support was packed in a fixed-bed reactor which was recycled, and the reactor performance was evaluated by using a synthetic wastewater of glucose and cornsteep-liquor. The COD removal reached 90% on the 17th d, and the acclimation of the immobilized bacteria was accomplished within 30 d. The COD removal at an HRT of 24 h was 96 to 93% for a COD load of 5 to 12 gdm^-^3d^-^1, COD removal of 85% was obtained at an HRT of 8 h and COD loading rate of 7.2 gdm^-^3d^-^1. The SS in the effluent was 0.07 to 0.37 gdm^-^3, and the net biomass yield and methane conversion ratio were 0.02 gVSSg^-^1 COD and 0.36 dm^3g^-^1 COD (25^oC), respectively. In terms of system stability at a short HRT, methane conversion, and biomass yield, the performance of the immobilized system was better than the biofilm system.
http://dx.doi.org/10.1016/0922-338X(92)90188-Z
Keywords: ZM