An Experimental Study on Application of ImmobilizedMicroorganism Technology for Treatment of PhenolicWastewater

摘要

In this paper, phenol wastewater treatment was investigated by using improved PVAimmobilization of good strains. Immobilization method based on the usage of phosphorylatedpolyvinyl alcohol (PVA) was developed. PVA was first cross linked with boric acid for a short time (10min) to form a spherical structure, which was followed by solidification of the gel beads byesterification of PVA with phosphate. The optimum condition of immobilizing microorganism by PVAand the characteristics such as activity of immobilized gel, resistibility of high phenol were studied inthe experiment. The optimum condition of immobilizing microorganism: the consistence of PVA is100 g·L-1; the PH of cross linker is 7.0. So the PVA hydrogel has a high tensile and folding strengthand good handleability and processability.And the immobilized spherules utilized for phenol degradation after domestication are prepared byembedding immobilized bacteria sludge for degradation of phenol by the embedding carrier PVA,with the addition of feasible powder active carbon. The results show that the efficiency of degradingphenol by immobilized microorganism can be enhanced obviously. The degradation rate to 1500mg·L-1 can be beyond 98.3%. Moreover, the retaining time of wastewater has been shortened. Thismethod has been proved to be an efficient approach to treat phenolic wastewater.