锰氧化菌激活及生物氧化锰去除乙炔基雌二醇试验研究
2021-07-22翟俊夏亦寒成水平田雨王泉峰
翟俊 夏亦寒 成水平 田雨 王泉峰



摘 要:利用污水廠好氧污泥进行锰氧化细菌的激活试验,探究pH值以及初始Mn2+浓度对激活效果的影响,采用高通量测序技术分析激活前后微生物群落变化,利用X射线衍射(X-ray diffraction,XRD)技术对产生的生物氧化锰进行表征,研究pH值和投加量对生物氧化锰去除乙炔基雌二醇(17α-ethinylestradiol,EE2)的影响。结果表明:pH值为7、初始Mn2+浓度为1 mmol/L时,Mn2+氧化率7 d内能达到83.3%,锰氧化菌激活效果最好。XRD结果表明:生物氧化锰主要含有MnO2、Mn3O4、Na3Mn(PO3)CO3等3种成分。高通量测序结果表明:经过激活后,芽孢杆菌属(0.75%)、不动杆菌属(1.26%)、假单胞菌属(1.36%)、鞘氨醇杆菌属(1.81%)、黄杆菌属(2.39%)、微杆菌属(2.97%)、气单胞菌属(7.35%)的丰度显著增加,典型的锰氧化细菌菌属总丰度达到17.89%。EE2在反应pH值为4.0、生物氧化锰投加量为20 mg/L的条件下去除效果最好,48 h后EE2的去除率可达97.7%,其中,生物氧化锰对EE2的去除率可达76.9%。
关键词:乙炔基雌二醇;锰氧化菌;高通量测序;生物氧化锰
中图分类号:X522 文献标志码:A 文章编号:2096-6717(2020)04-0154-08
收稿日期:2020-09-26
基金项目:国家自然科学基金(51878093)
作者简介:翟俊 (1977- ),男,教授,博士生导师,主要从事废水处理理论与技术研究,E-mail:zhaijun99@126.com。
Received:2020-09-26
Foundation item:National Natural Science Foundation of China (No. 51878093)
Author brief:ZHAI Jun (1977- ), professor, doctorial supervisor, main research interests: wastewater treatment theory and technology, E-mail: zhaijun99@126.com.
Activation of manganese-oxidizing bacterium and removal of 17 α-ethinylestradiol by biogenic manganese oxides
ZHAI Jun1, XIA Yihan1, CHENG Shuiping2, TIAN Yu1, WANG Quanfeng1
(1. College of Environment and Ecology, Chongqing University, Chongqing 400045, P. R. China; 2. College of Environmental Science and Engineering, Tongji University, Shanghai 200092, P. R. China)
Abstract: Aerobic sludge from the wastewater treatment plant was sampled as inoculation bacteria, and the effects of pH and initial Mn2+ concentration on the activation of manganese-oxidizing bacterium were studied. High-throughput sequencing technology was used to analyze the variation of microbial communities before and after activation. On this basis, the biogenic manganese oxides produced by manganese-oxidizing bacterium were characterized by X-ray diffraction. Besides, the effects of pH and biogenic manganese oxides dosage on the removal of EE2 by biogenic manganese oxides were analyzed. The results show that the best activation effect of manganese oxidizing bacterium is obtained when the initial Mn2+ concentration is 1 mmol/L at pH 7.0 and 83.3% Mn2+ is transformed into biogenic manganese oxides after 7 days under this condition. XRD results show that the biogenic manganese oxides produced mainly include MnO2, Na3Mn(PO3)CO3, and Mn3O4. According to the results of high-throughput sequencing, the abundance of Bacillus(0.75%), Acinetobacter(1.26%), Pseudomonas(1.36%), Sphingobacterium(1.81%), Flavobacterium(2.39%), Exiguobacterium(2.97%), Areomonas(7.35%) increases significantly, and the total relative abundance of typical manganese-oxidizing bacterium reaches 17.89%. When the biogenic manganese oxides dosage is 20 mg/L at pH 4.0, EE2 has the best removal efficiency. After 48 h, the removal rate of EE2 reaches 97.7%, in which 76.9% is removed by biogenic manganese oxides.
Keywords:17α-ethinylestradiol; manganese-oxidizing bacterium; high-throughput sequencing; biogenic manganese oxides
乙炔基雌二醇(17α-ethinylestradiol,EE2)是一种典型的人工合成类固醇雌激素,主要应用于治疗脱发症、乳腺癌、前列腺等疾病,其中,大量未被人体利用的EE2以及代谢物会排放进入环境[1]。据统计,目前中国自然水体内的EE2浓度为5.7~70 ng/L[2-4]。然而,即使在如此低浓度的条件下,EE2也会对环境中非目标生物的生长、发育以及繁殖产生明显影响,甚至会通过食物链富集对生态安全和人类健康产生潜在威胁[5]。……
