Abstract
Concern over steroid estrogens has increased rapidly in recent years due to their adverse health effects. Effluent discharge from wastewater treatment plants (WWTPs) is the main pollutant source for environmental water. To understand the pollutant level and fate of steroid estrogens in WWTPs, the occurrence of estrone (E1), 17-β-estradiol (E2), estriol (E3), and 17-β-ethinylestradiol (EE2) was investigated in the Gaobeidian WWTP in Beijing, China. Water samples from influent as well as effluent from second sedimentation tanks and advanced treatment processes were taken monthly during 2006 to 2007. In influent, steroid estrogen concentrations varied from 11.6 to 1.1 × 102 ng/l, 3.7 to 1.4 × 102 ng/l, no detection (nd) to 7.6×102 ng/l and nd to 3.3 × 102 ng/l for E1, E2, E3, and EE2, respectively. Compared with documented values, the higher steroid estrogen concentrations in the WWTP influent may be due to higher population density, higher birthrate, less dilution, and different sampling time. Results revealed that a municipal WWTP with an activated sludge system incorporating anaerobic, anoxic, and aerobic processes could eliminate natural and synthetic estrogens effectively. The mean elimination efficiencies were 83.2%, 96.4%, 98.8%, and 93.0% for E1, E2, E3, and EE2, respectively. The major removal mechanism for natural estrogens and synthetic estrogen EE2 were biodegradation and sorption on the basis of mass balance in water, suspension particles, and sludge. In the WWTP effluent, however, the highest concentrations of E1, E2, E3, and EE2 attained were 74.2, 3.9, 5.1, and 4.6 ng/l, respectively. This is concerning as residual steroid estrogens in WWTP effluent could lead to pollution of the receiving water. Advanced flocculation treatment was applied in the WWTP and transformed the residual estrogen conjugates to free species, which were reduced further by filtration with removal shifting from 32% to 57% for natural estrogen, although no EE2 was removed.
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Acknowledgements
We thank Dr. Jun Zhou for providing us with the WWTP information and Dr. Xiaoqing He for providing us with help during the sampling period. This work was supported by the Chinese Academy of Sciences (KZCX1-YW-06) and the National Basic Research Program of China (2007CB407301).
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Zhou, Y., Zha, J. & Wang, Z. Occurrence and fate of steroid estrogens in the largest wastewater treatment plant in Beijing, China. Environ Monit Assess 184, 6799–6813 (2012). https://doi.org/10.1007/s10661-011-2459-y
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DOI: https://doi.org/10.1007/s10661-011-2459-y