Effects of bacterial activity on estrogen removal in nitrifying activated sludge.
The effects of bacterial activity on the degradation of estrone (E1), estradiol (E2), estriol (E3) and ethinylestradiol (EE2) in nitrifying activated sludge (NAS) were studied with different substrates and organic loading rates (OLRs) and low temperature conditions. Heterotroph was shown to have utilized glucose prior to E1 for metabolism. The co-metabolism of ammonia oxidizing bacteria (AOB) dominated the degradation of E1, E2 and EE2 in NAS. The higher the organic loading, the higher the rate of organic matter transformation, with less ammonia oxidation and less degradation of E1, E2 and EE2. The degradation of E3 in NAS was shown to be largely due to heterotroph metabolism. On the basis of the difference of apparent activity between heterotroph and AOB at 4 degrees C, the process of estrogen degradation via the co-metabolism of AOB was able to be identified.
Ren
Yong-Xiang
YX
Graduate School of Engineering, Tohoku University. 6-6-06 Aoba, Sendai 980-8579, Japan.
Nakano
Kazunori
K
Nomura
Munehiro
M
Chiba
Nobuo
N
Nishimura
Osamu
O
D001419:Bacteria / Q000378:metabolism*; D004967:Estrogens / Q000302:isolation & purification* / Q000378:metabolism*; D009584:Nitrogen / Q000378:metabolism*; D012722:Sewage / Q000737:chemistry* / Q000382:microbiology*; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000378:metabolism
D004967:Estrogens; D012722:Sewage; D014874:Water Pollutants, Chemical; D009584:Nitrogen