How does the entering of copper nanoparticles into biological wastewater treatment system affect sludge treatment for VFA production.
How does the entering of copper nanoparticles into biological wastewater treatment system affect sludge treatment for VFA production.
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DOI：
10.1016/j.watres.2014.06.024
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发表时间：
2014-10
期刊：
影响因子：
12.8
通讯作者：
Hong Chen;Yinguang Chen;Xiong Zheng;Xiang Li;Jingyang Luo
中科院分区：
文献类型：
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作者：
Hong Chen;Yinguang Chen;Xiong Zheng;Xiang Li;Jingyang Luo
通常，在文献中关于释放到污水处理厂的工程纳米颗粒（NPs）对污泥厌氧处理的影响的研究是通过将NPs直接添加到污泥处理系统中来进行的。实际上，在污泥被处理之前，NP必须从进水进入污水处理设施。因此，记录的结果不能反映真实的情况。在污泥厌氧发酵生产挥发性脂肪酸（VFA，废水生物脱氮的首选碳源）的过程中，研究发现，CuNPs进入生物废水处理系统对污泥来源的VFA的产生没有显著影响，而直接向污泥发酵反应器中添加CuNPs则导致VFA的产生显著低于对照试验。进一步的研究表明，CuNPs进入污水生物处理系统后，污泥颗粒尺寸减小，污泥微生物细胞破碎率增加，从而提高了污泥的溶解性。此外，对水解没有明显的影响，但对酸化有明显的抑制作用，导致最终VFA产量与对照相似。直接添加纳米铜对发酵体系的增溶作用影响不大，但对水解和酸化作用有严重抑制作用，导致最终VFA产量下降。因此，选择合适的接近真实的情况的方法，对准确评价纳米颗粒对污泥厌氧发酵的毒性至关重要。
Usually the studies regarding the effect of engineered nanoparticles (NPs), which are released to wastewater treatment plant, on sludge anaerobic treatment in the literature have been conducted by directly adding NPs to sludge treatment system. Actually, NPs must enter into the wastewater treatment facility from influent before sludge being treated. Thus, the documented results can not reflect the real situations. During sludge anaerobic treatment for producing volatile fatty acids (VFA, the preferred carbon source for wastewater biological nutrient removal), it was found in this study that the entering of CuNPs to biological wastewater treatment system had no significant effect on sludge-derived VFA generation, while direct addition of CuNPs to sludge fermentation reactor caused a much lower VFA production, when compared to the control test. Further investigation revealed that the entering of CuNPs into wastewater biological treatment system improved sludge solubilization due to the decline of sludge particle size and the increase of sludge microorganism cells breakage. In addition, there was no obvious influence on hydrolysis, while significant inhibition was observed on acidification, resulting in the final VFA production similar to the control. When CuNPs were directly added to the fermentation system, the solubilization was little influenced, however the hydrolysis and acidification were seriously inhibited, causing the ultimate VFA generation decreased. Therefore, selecting proper method close to the real situation is vital to accurately assess the toxicity of nanoparticles on sludge anaerobic fermentation.