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首页> 外文期刊>Environmental Science & Technology >Estimation of Water Sampling Rates and Concentrations of PAHs in a Municipal Sewage Treatment Plant Using SPMDs with Performance Reference Compounds
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Estimation of Water Sampling Rates and Concentrations of PAHs in a Municipal Sewage Treatment Plant Using SPMDs with Performance Reference Compounds

机译：使用SPMD与性能参考化合物估算市政污水处理厂的水采样率和PAHs浓度

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摘要

Semipermeable membrane devices (SPMDs) were exposed at ten sampling points, each representing a different stage in the treatment process, in a municipal sewage treatment plant. Differences in SPMD uptake kinetics of polycyclic aromatic hydrocarbons (PAHs) due to variations in conditions at the sampling sites were evaluated by using five performance reference compounds (PRCs) with log K_(ow) values of 4.20 to 6.34. PRC release rate constants (k_(e,PRC) values) were calculated for PRCs for which 50-98%rnof the initial amounts were lost during the sampling period. The k_(e,PRC) values were high, ranging from 0.08 to 0.11 day~(-1) for the studied PRCs, at sampling site W1 (raw sewage), the only sampling site where significant amounts of the PRCs with log K_(ow) values > 5 were released from the SPMDs. At the other sampling sites, only PRCs with log K_(ow) values between 4.20 and 4.50 were released in significant amounts. The release rates at these sites were lowest (0.04 day~(-1)) at sampling site W9 (the secondary clarifier) and highest (0.18 day~(-1)) at W8 (the active sludge aeration basin). Differences between sampling rates (R_s) obtained using published laboratory-calibrated data and PRC-corrected R_s values were visualized by principal component analysis (PCA). The water concentrations of 24 studied PAHs fell substantially during the course of the sewage treatment process. However, low molecular weight PAHs were more effectively removed than high molecular weight PAHs. Significant deviations between actual and estimated water concentrations may arise unless PRC-corrected R_s values are applied.
机译：在市政污水处理厂中，半渗透膜装置（SPMD）暴露于十个采样点，每个采样点代表处理过程的不同阶段。通过使用五个对数K_（ow）值为4.20至6.34的性能参比化合物（PRC）来评估由于采样点条件变化而引起的多环芳烃（PAH）SPMD吸收动力学差异。计算了PRC释放速率常数（k_（e，PRC）值），其中PRC在采样期间损失了初始值的50-98％。 k_（e，PRC）值很高，在被采样的PRC的采样点W1（原始污水）处为0.08到0.11天〜（-1），这是唯一的采样点，其中有大量的logs K_（ ow）从SPMD中释放了> 5的值。在其他采样地点，仅释放了log K_（ow）值在4.20和4.50之间的PRC。在采样点W9（二级澄清池），这些位置的释放速率最低（0.04天〜（-1）），而在W8（活性污泥曝气池）的最高释放速率（0.18天〜（-1））。通过主成分分析（PCA）可以显示使用已发布的实验室校准数据获得的采样率（R_s）与PRC校正的R_s值之间的差异。在污水处理过程中，研究的24种多环芳烃的水含量大幅下降。但是，低分子量的PAHs比高分子量的PAHs更有效地被去除。除非应用PRC校正的R_s值，否则实际和估计的水浓度之间可能会出现明显的偏差。

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  • 来源
    《Environmental Science & Technology》 |2007年第14期|5044-5049|共6页
  • 作者

    LIJANA AUGULYTE; PER-ANDERS BERGQVIST;

  • 作者单位

    Department of Chemistry, Environmental Chemistry, Umek University, SE-901 87 Umek, Sweden;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

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