Augulyte Lijana, Kliaugaite Daina, Racys Viktoras, Jankunaite Dalia, Zaliauskiene Audrone, Bergqvist Per-Anders, Andersson Patrik L
Department of Chemistry, Umeå University, 901 87 Umeå, Sweden.
J Hazard Mater. 2009 Oct 15;170(1):103-10. doi: 10.1016/j.jhazmat.2009.04.129. Epub 2009 May 6.
The efficiency of a biologically activated carbon system for treating wastewater polluted with petroleum products was examined and the effects of process parameters on its efficacy were evaluated. In each experiment 17 alkylated and 19 non-alkylated polycyclic aromatic hydrocarbons (PAHs) and total petroleum hydrocarbons (TPHs, C(10)-C(40)) were extracted using semipermeable membrane devices from wastewater before and after treatment. The acquired data during experiments were analyzed using principal component analysis (PCA). The treatment system robustly removed dissolved PAHs across the studied ranges of the process parameters, providing overall removal efficiencies of 96.9-99.7% for the sum of 36 PAHs. However, the major contributor to their removal was sorption rather than biodegradation, and despite the general efficiency of the process there was up to a 9-fold range in the sums of quantified PAHs in the effluents between experiments. Combinations of long process contact time (24 h) with high temperature (24 degrees C) and moderate oxygen concentration (6-7 mg O(2) L(-1)) resulted in good removal of bioavailable PAHs. The removal of TPHs was more dependent on biological activities during the wastewater treatment, and consequently more dependent on the process parameters. In addition, small but significant proportions of PAHs were volatilized and released during the wastewater treatment.
考察了生物活性炭系统处理受石油产品污染废水的效率，并评估了工艺参数对其效能的影响。在每个实验中，使用半透膜装置从处理前后的废水中提取17种烷基化和19种非烷基化多环芳烃（PAHs）以及总石油烃（TPHs，C(10)-C(40)）。实验期间获取的数据采用主成分分析（PCA）进行分析。在所研究的工艺参数范围内，该处理系统能有效去除溶解的PAHs，36种PAHs总和的总体去除效率为96.9-99.7%。然而，其去除的主要贡献因素是吸附而非生物降解，尽管该工艺总体效率较高，但不同实验中流出物中定量PAHs总和的范围高达9倍。较长的工艺接触时间（24小时）与高温（24℃）和中等氧浓度（6-7mg O(2) L(-1)）的组合可有效去除生物可利用的PAHs。TPHs的去除在废水处理过程中更依赖生物活性，因此更依赖工艺参数。此外，在废水处理过程中有少量但显著比例的PAHs挥发并释放。
