摘要：Phenol and its derivatives are the most abundant organic contaminants in coking wastewater with high toxicity, carcinogenicity and mutagenesis, which often inhibit or kill the microorganisms in biological reactors. Therefore, it is necessary to screen a high-efficient phenol-degrading strain for improving degradation efficiency of phenol. In this study, a strain of Serratia sp. was isolated from coking wastewater treatment system and then immobilized using polyvinyl alcohol (PVA)-carrageenan. Furthermore, degradation kinetics of free and immobilized Serratia sp. for phenol were compared based on Haldane model. The fitted kinetics equation showed that the maximum phenol specific degradation rate of free Serratia sp. was 0.076 h-1, while that of the immobilized one was 6.696 h-1. Its value was much higher than the former, which indicated that the degradation efficiency for phenol of immobilized Serratia sp. was much stronger than that of free Serratia sp.. Moreover, comparison experiment of free and immobilized Serratia sp. for phenol degradation performance from actual coking wastewater further confirmed the above results.
