Removal of endocrine-disrupting chemicals and conventional pollutants in a continuous-operating activated sludge process integrated with ozonation for excess sludge reduction.
Removal of endocrine-disrupting chemicals and conventional pollutants in a continuous-operating activated sludge process integrated with ozonation for excess sludge reduction.
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DOI：
10.1016/j.chemosphere.2014.01.006
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发表时间：
2014-06
期刊：
影响因子：
8.8
通讯作者：
Yafeng Nie;Z. Qiang;Weiwei Ben;Jun-xin Liu
中科院分区：
文献类型：
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作者：
Yafeng Nie;Z. Qiang;Weiwei Ben;Jun-xin Liu
污泥臭氧化被认为是实现剩余污泥完全减量的有前途的技术，但迄今为止其对内分泌干扰物（EDCs）和常规污染物（即，COD、N和P）在活性污泥法中的作用尚不清楚。在这项研究中，建立了两个实验室规模的连续运行的活性污泥处理系统：一个是与臭氧氧化剩余污泥减量，另一个是在正常条件下运行作为对照。结果表明，臭氧投加量为100 mg O3 g − 1 SS时，在45 d的连续运行期内，污泥减量系统中的剩余污泥产量为零。臭氧氧化虽然降低了活性污泥的比耗氧速率，但对系统的COD和含氮物质的去除效果影响不大。污泥臭氧化对目标内分泌干扰物（雌酮、17β-雌二醇、雌三醇、17α-乙炔基雌二醇、双酚A和4-壬基酚）的去除率略高。然而，总磷去除率下降显着，由于其积累在污泥减量系统，这需要磷回收的活性污泥法。
Sludge ozonation is considered as a promising technology to achieve a complete reduction of excess sludge, but as yet its effects on the removal of endocrine-disrupting chemicals (EDCs) and conventional pollutants (i.e., COD, N and P) in the activated sludge process are still unclear. In this study, two lab-scale continuous-operating activated sludge treatment systems were established: one was operated in conjunction with ozonation for excess sludge reduction, and the other was operated under normal conditions as control. The results indicate that an ozone dose of 100 mg O3g−1SS led to a zero yield of excess sludge in the sludge-reduction system during a continuous-operating period of 45 d. Although ozonation gave a relatively lower specific oxygen uptake rate of activated sludge, it had little effect on the system’s removal performance of COD and nitrogen substances. As a plus, sludge ozonation contributed a little more removal of target EDCs (estrone, 17β-estrodiol, estriol, 17α-ethinylestradiol, bisphenol A, and 4-nonylphenol). However, the total phosphorus removal declined notably due to its accumulation in the sludge-reduction system, which necessitates phosphorus recovery for the activated sludge process.