Performance evaluation of anaerobic fluidized bed reactors using brick beads and porous ceramics as support materials for treating terephthalic acid wastewater

Abstract

A B S T R A C TThis study evaluated two different porous support materials (brick beads and porous ceramics) used in rapid mass-transfer anaerobic fluidized bed reactors (AFBRs) for treating terephthalic acid wastewater. The AFBRs, denoted as R1 (containing brick beads) and R2 (containing porous ceramics), were inoculated with anaerobic sludge. Results showed that the system organic loading rate increased from 7.37 kg COD/(m 3 d) to 18.52 kg COD/(m 3 d) over a period of 73 d. During the steady period, R2 showed better performance than R1. The chemical oxygen demand removal efficiency and total alkalinity removal efficiency of R1 were 65-75% and 60-70%, whereas those of R2 were 75-88% and 72-84%, respectively.

A Study on the Removal of Copper (II) from Aqueous Solution Using Lime Sand Bricks

“…The surface topography of the brick was analyzed by SEM, as shown in Figure 2. It was observed that the surfaces of lime sand bricks were uneven with large numbers of pore spaces, which perhaps provided sites for adsorption of Cu(II) either physically or chemically [23]. Figure 3 shows the FTIR spectra of the lime sand brick before Cu(II) adsorption.…”

Method for Determining the Hydraulic-Retention Time and Operating Conditions of a Circulating-Fluidized-Bed Bioreactor with Composition Disturbances

“…The fluidized-bed bioreactor (FBBR) has attracted significant attention as an alternative to the conventional suspended-growth wastewater-treatment processes because of its high-efficiency performance. Several advantages of FBBR compared with conventional wastewater-treatment processes, such as its higher biomass concentration, higher mass-transfer efficiency, lower hydraulic-retention time (HRT), and smaller footprint, have been discussed extensively in the literature. − Compared with the conventional liquid–solid FBBR, the liquid–solid circulating-fluidized-bed bioreactor (CFBBR) has additional advantages . The liquid–solid CFBBR integrates two fluidized beds into one unit, and several biochemical processes can occur within a single system, with particle recirculation between the two fluidized beds.…”