Biodegradation of Nonylphenol Ethoxylates by a Bacterial Strain with Heterotrophic Nitrogen Removal Ability
1株异养脱氮菌降解壬基酚聚氧乙烯醚的研究

Biodegradation of nonylphenol ethoxylates(NPEOs) by Bacillus sp.LY with heterotrophic nitrogen removal ability was investigated.The study showed that Bacillus sp.LY could biodegrade NPEOs largely combined with heterotrophic nitrogen removal.After 14d,removal efficiency of NPEOs was 95.6% and removal rates of TN was 43.9%.Biodegradation of NPEOs by the strain Bacillus sp.LY conformed to the first-order kinetic model,with biodegradation rate constant 0.224 d-1. NPEOs were biodegraded through a nonoxidative pathway with sequential removal of ethoxyl units.Moreover,no more harmful nonylphenoxyacetic acids were formed by this pathway.NPEOs could be degraded by Bacillus sp.LY in the presence of different nitrogen contaminants NH4Cl,NaNO3 and NaNO2. The removal efficiency of NPEOs was highest in the presence of ammonium.Results may make contribution to the efficient removal of compound contamination of NPEOs and nitrogen contaminants.