17.-estradiol degrading bacteria in sequencing batch reactors for swine wastewater treatment

Meixue Chen, Hui Fang, Rong Qi, Shuaixiong He, Yuansong Wei

State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China


Two 17 -Estradiol (E2) degrading strains were isolated from the activated sludge of swine wastewater bio-treatment aerobic facility and affiliated to Bacillus subtilis based on 16S rRNA gene sequencing. The degradation rates were more than 90 95% at 37 C in 4 days when E2 was the sole carbon source. Steady and effective nutrients and estrogen removals were achieved in three parallel sequencing batch reactors (SBRs) treating real swine wastewater for 90 days, which contributed to the existence of the representatives from genera Brevibacterium, Bacillus, Nitrobacter and Methylophilus. However, the Bacillus subtilis-like strain was present in a greater abundance in Run A and Run B, as extra 10 mg/L and 1 mg/L E2 was added, to reveal its distribution contributed to process estrogen removal.


Bacillus subtilis; degradation bacteria; SBR; swine wastewater; 17 -Estradiol

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