Effects of copper particles on a model septic system's function and microbial community.
Effects of copper particles on a model septic system's function and microbial community.
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DOI：
10.1016/j.watres.2016.01.014
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发表时间：
2016-03-15
期刊：
影响因子：
12.8
通讯作者：
Walker SL
中科院分区：
文献类型：
--
作者：
Taylor AA;Walker SL
由于潜在的毒性以及人类和环境暴露于这些颗粒的风险增加，人们对将纳米颗粒添加到消费品中感到担忧。铜纳米颗粒存在于许多常见的消费品中;因此，潜在有毒的铜基纳米颗粒和微生物群落之间的处置和随后的相互作用可能对废水处理过程产生不利影响。本研究探讨了三种铜颗粒（微米级和纳米级铜颗粒，和纳米级Cu（OH）2为基础的杀菌剂）对模型化粪池的功能和操作的影响。化粪池系统分析包括水质评价和微生物群落表征，以检测化粪池功能和微生物群落表型/基因型之间的变化和关系。正如预期的最佳废水处理，生物需氧量（BOD 5）减少了至少63%，在纳米级铜暴露，表明正常的功能。pH值降低到低于最佳厌氧发酵范围在微量铜暴露，这表明可能发生了不完全降解的有机废物。铜杀真菌剂Cu（OH）2导致总有机碳（TOC）增加57%，这远高于化粪池系统的典型范围，并且在大部分Cu（OH）2暴露期间也对应于增加的BOD 5。TOC和BOD 5的变化表明该系统处理废物不当。总的来说，结果表明，个人暴露于三个铜颗粒引起的化粪池功能的明显中断。然而，据观察，该系统能够恢复到典型的操作条件后，三个星期的曝光。这些结果意味着，在铜的引入期间，有可能是脉冲的总有机碳的不适当的去除和显着的pH值的变化不在系统的最佳范围内。
There is concern surrounding the addition of nanoparticles into consumer products due to toxicity potential and the increased risk of human and environmental exposures to these particles. Copper nanoparticles are found in many common consumer goods; therefore, the disposal and subsequent interactions between potentially toxic Cu-based nanoparticles and microbial communities may have detrimental impacts on wastewater treatment processes. This study investigates the effects of three copper particles (micron- and nano-scale Cu particles, and a nano-scale Cu(OH)2-based fungicide) on the function and operation of a model septic tank. Septic system analyses included water quality evaluations and microbial community characterizations to detect changes in and relationships between the septic tank function and microbial community phenotype/genotype. As would be expected for optimal wastewater treatment, biological oxygen demand (BOD5) was reduced by at least 63% during nano-scale Cu exposure, indicating normal function. pH was reduced to below the optimum anaerobic fermentation range during the micro Cu exposure, suggesting incomplete degradation of organic waste may have occurred. The copper fungicide, Cu(OH)2, caused a 57% increase in total organic carbon (TOC), which is well above the typical range for septic systems and also corresponded to increased BOD5 during the majority of the Cu(OH)2 exposure. The changes in TOC and BOD5 demonstrate that the system was improperly treating waste. Overall, results imply individual exposures to the three Cu particles caused distinct disruptions in septic tank function. However, it was observed that the system was able to recover to typical operating conditions after three weeks post-exposure. These results imply that during periods of Cu introduction, there are likely pulses of improper removal of total organic carbon and significant changes in pH not in the optimal range for the system.