Short-term effects of nanoscale Zero-Valent Iron (nZVI) and hydraulic shock during high-rate anammox wastewater treatment
Short-term effects of nanoscale Zero-Valent Iron (nZVI) and hydraulic shock during high-rate anammox wastewater treatment
复制标题
纳米零价铁 (nZVI) 和水力冲击在高速率厌氧氨氧化废水处理过程中的短期影响
DOI：
10.1016/j.jenvman.2018.03.069
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发表时间：
2018
影响因子：
8.7
通讯作者：
Jin Ren Cun
中科院分区：
文献类型：
--
作者：
Xu Jia Jia;Zhang Zheng Zhe;Ji Zheng Quan;Zhu Ying Hong;Qi Si Yu;Tang Chong Jian;Jin Ren Cun
在上流式厌氧污泥包层反应器中，研究了瞬态纳米级零价铁（nZVI）（50、75和100 mg L−1）、水力冲击（流量增加2倍）及其组合作用下厌氧氨氧化（anammox）系统的稳定性和弹性。对冲击载荷的响应可分为三个阶段，即冲击、惯性和恢复期。冲击载荷的影响与冲击强度成正比。高浓度nZVI（100 mg L−1）作用2 h后，出水水质逐渐恶化。在水力冲击和联合冲击下，单位冲击强度对出水的敏感性指数和反应都较高。在冲击阶段，厌氧氨氧化活性和血红素c含量显著降低，最大损失率分别为30.5%和24.8%。然而，在所有测试的冲击负荷下，冲击期的细胞外聚合物数量都有不同程度的增加，变化趋势不同。这些结果表明，厌氧氨氧化系统的稳健性取决于所施加的冲击的大小，在这种情况下，随着nZVI浓度的增加，减少水力停留时间可以提高反应器的阻力。
The stability and resilience of an anaerobic ammonium oxidation (anammox) system under transient nanoscale Zero-Valent Iron (nZVI) (50, 75 and 100 mg L−1), hydraulic shock (2-fold increase in flow rate) and their combination were studied in an up-flow anaerobic sludge blanket reactor. The response to the shock loads can be divided into three phases i.e. shock, inertial and recovery periods. The effects of the shock loads were directly proportional to the shock intensity. The effluent quality was gradually deteriorated after exposure to high nZVI level (100 mg L−1) for 2 h. The higher effluent sensitivity index and response caused by unit intensity of shock was observed under hydraulic and combined shocks. Notably, the specific anammox activity and the content of heme c were considerably reduced during the shock phase and the maximum loss rates were about 30.5% and 24.8%, respectively. Nevertheless, the extracellular polymeric substance amount in the shock phase was enhanced in varying degrees and variation tendency was disparate at all the tested shock loads. These results suggested that robustness of the anammox system was dependent on the magnitude shocks applied and the reactor resistance can be improved by reducing hydraulic retention time with the increase of nZVI concentration under these circumstances.