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| Study of emission characteristics and removal efficiency of estrogens in biogas slurry at farm |
| YU Wei-wei1, YANG Shuo1, YANG Lun1, DU Bang-hao1, WAN Qiao-ling2, CHEN Yao1, XIE Ming-yang1 |
1. School of River and Ocean Engineering, Chongqing Jiaotong University, Key Laboratory of Hydraulic and Waterway Engineering of theMinistry of Education, Chongqing 400074, China;
2. Chongqing Monitoring Station, Water Quality Monitoring Network of National Urban Water Supply, Chongqing 400060, China |
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Abstract To explore the emission characteristics of steroid estrogens in biogas slurry, the anaerobic and aerobic tank effluent samples were continuously monitored in summer, autumn, and winter by solid phase extraction-high performance liquid chromatography-tandem mass spectrometry (SPE-HPLC-MS/MS) analysis method from a typical dairy farm in Chongqing city, China. The results showed that the total amounts of five steroid estrogens (estrone; 17α-estradiol; 17β-estradiol; estriol; estrone-3-sulfate) were ranged at 347.28~2117.65ng/L and 10.75~1070.00ng/L in anaerobic and aerobic tank effluent, respectively. The anaerobic tank effluent was dominated by E1, 17α-E2, and 17β-E2, and the aerobic tank effluent was dominated by E1 and 17β-E2.The average removal efficiency of E1, 17β-E2, and 17α-E2by aerobic treatment reached 85.70%, 56.82%, and 57.32%, respectively. Moreover, E1-3S was effectively removed under anaerobic treatment. Under the effect of microorganisms, the interconversion amongE1, 17α-E2, and 17β-E2 was found both in anaerobic and aerobic treatment. However, the low detection frequency of E3 indicated that the ratio of estrogen to E3 was lower in the system. The assessment of simulated estrogen activity (EEQ95th) was reduced by an average of 70.34% after anaerobic-aerobic treatment, but the estrogens ecological risk of biogas slurry could not be ignored and required continuous monitoring.
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Received: 09 October 2019
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