Biodegradation of phenol in a draft-tube spouted bed bioreactor with biomass attached to hydrogel particles

Abstract

The performance of a draft-tube spouted bed bioreactor (DT-SBB) packed with hydrogel particles for biomass immobilization has been used to treat a phenolic wastewater in continuous mode. The biomass support particles were made of a cyclodextrin-based polymer and then seeded with an acclimated mixed culture. Due to the low density of such particles and also the bioreactor design, the pumping energy required to maintain a moving bed of the resulting bioparticles was very low and a recirculation flow was not necessary. The inlet phenol concentration and the phenol inlet loading rate were the operating variables studied. Phenol removal efficiency was used to monitor the process. The DT-SBB showed a high removal capacity (up to 2.8 kg-phenol/m 3 d) with a high efficiency (>99%). The removal capacity of the DT-SBB was found to be limited by the availability of dissolved oxygen in periods with high phenol elimination rate. The removal efficiency decreased significantly for higher loading rates (>3.1 kg/m 3 d) because of phenol inhibition. The evolution of the distribution of microbial populations was also investigated. A predominance of gram-negative bacteria (especially the genera Pseudomonas and Acinetobacter) was observed during the periods of maximum degradation.

Development of Novel N-isopropylacrylamide (NIPAAm) Based Hydrogels with Varying Content of Chrysin Multiacrylate

“…NIPAAm-based polymers exhibit a lower critical solution temperature (LCST) at ~32–33 °C in aqueous solution, which can be easily adjusted to physiological temperature through the modification of the hydrophilic/hydrophobic balance in the polymer with comonomers [ 6 , 7 , 8 , 9 , 10 ]. There are numerous applications of the sharp phase transition, which can be a reversible swelling change for crosslinked systems, especially in the designing of a controlled release system e.g., drug delivery, analytical separation and detection [ 11 , 12 , 13 , 14 , 15 ].…”