Isolation and identification of bacterial strains efficient degrading formaldehyde and their degrading characteristics

Abstract:

In this paper, two newly isolated bacterial strain A1 and strain A2, which were capable of degrading formaldehyde in high efficiency, were identified based on the results of standard morphological identification, physiological and biochemical characters, 16S rDNA sequence analysis. Their capability of degrading formaldehyde was investigated by determination of the formaldehyde concentration change in culture. The biological packed tower hung membrane experiment was carried to determine the purification performance of the two bacterial to formaldehyde gas. The results showed that: these two bacterial strain A1 and strain A2 were identified as Pseudomonas and Sphingomonas, respectively; when formaldehyde initial concentration was below 1 200 mg/L, it could be degraded by bacteria strain A1and strain A2 completely; when original formaldehyde concentration was up to 1 600 mg/L, 50% of formaldehyde was consumed by strain A1 after 48 h, 74.3% of formaldehyde was consumed by strain A2 after 104 h; the removal efficiency of these two bacteria could be over 99%, the formaldehyde re-moval biochemical can amount to 26.4 mg/(L?h) of strain A1 and 20.6 mg/(L?h) of strain A2.