纳米氧化锌对膜生物反应器 CANON 工艺中氮去除、微生物活性和微生物群落的影响。
Effect of zinc oxide nanoparticles on nitrogen removal, microbial activity and microbial community of CANON process in a membrane bioreactor.
机构信息
Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, School of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China.
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
出版信息
Bioresour Technol. 2017 Nov;243:93-99. doi: 10.1016/j.biortech.2017.06.052. Epub 2017 Jun 15.
In this study, a membrane bioreactor (MBR) was adopted for completely autotrophic nitrogen removal over nitrite (CANON) process. Zinc oxide nanoparticles (ZnO NPs) was step-wise increased to analyze the influence on nitrogen removal, microbial activity and microbial communities. Finally ZnO NPs was removed to study its recovery capability. The bioactivities of ammonia-oxidizing bacteria (AOB), anaerobic ammonia-oxidizing bacteria (AAOB) and nitrite-oxidizing bacteria (NOB) were detected by batch experiments. Results showed that the ZnO NPs with low concentration (≤5mgL) was profitable for nitrogen removal while the high concentration performed inhibition, and it lowered the abundance of both AOB and NOB while enhanced that of AAOB. ZnO NPs with high concentration (≥10mgL) suppressed both AOB and AAOB, and long-term exposure within ZnO NPs led to microbial diversity decrease. The inhibition threshold of ZnO NPs on CANON process was 10mgL, and the profitable concentration was 1mgL.
在这项研究中，采用膜生物反应器（MBR）实现了亚硝酸盐完全自养脱氮（CANON）工艺。逐步增加氧化锌纳米颗粒（ZnO NPs），分析其对氮去除、微生物活性和微生物群落的影响。最后去除 ZnO NPs，研究其回收能力。通过批量实验检测氨氧化菌（AOB）、厌氧氨氧化菌（AAOB）和亚硝酸盐氧化菌（NOB）的生物活性。结果表明，低浓度（≤5mg/L）的 ZnO NPs 有利于氮的去除，而高浓度则表现出抑制作用，降低了 AOB 和 NOB 的丰度，同时提高了 AAOB 的丰度。高浓度（≥10mg/L）的 ZnO NPs 抑制了 AOB 和 AAOB，长期暴露在 ZnO NPs 中会导致微生物多样性减少。ZnO NPs 对 CANON 工艺的抑制阈值为 10mg/L，有利浓度为 1mg/L。
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