| 焦化废水A/O2和A/O/H/O处理工艺中多环芳烃的削减行为分析 |
| 摘要点击 1574 全文点击 617 投稿时间：2018-01-09 修订日期：2018-03-04 |
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| 中文关键词 焦化废水 A/O2 A/O/H/O 多环芳烃(PAHs) 生物降解 |
| 英文关键词 coking wastewater A/O2 A/O/H/O polycyclic aromatic hydrocarbons (PAHs) biodegradation |
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| 中文摘要 |
| 多环芳烃（PAHs）是焦化废水的特征污染物，不同的焦化废水处理工艺会影响其归趋行为与削减量.基于此，本文追踪了焦化废水厌氧/好氧/好氧（A/O2）和厌氧/好氧/水解/好氧（A/O/H/O）处理工艺中PAHs的分布行为，使用气质联用色谱（GC-MS）检测并分析了两种工艺中各单元反应器内废水及污泥样品的PAHs浓度，通过通量衡算，评估工艺系统处理效果的差异性.结果表明，两种工艺的前置A厌氧池对PAHs的削减不明显，PAHs在A池富集的浓度远高于O池及H池，低环PAHs经水相从A池进到O池后得到有效降解，高环PAHs则大部分富集于污泥相中，风险比较大，应该区别处理；A/O/H/O工艺对低环的PAHs生物削减率略高于A/O2工艺，对4环以上的PAHs，A/O/H/O则表现出更明显的降解有效性，理解为A/O/H/O工艺的H池促进了大分子有机物的水解，对PAHs具有针对性.综合研究结果认为，A/O/H/O工艺表现出比A/O2更明显的降解PAHs的优势. |
| 英文摘要 |
| Polycyclic aromatic hydrocarbons (PAHs) are typical organic pollutants found in coking wastewater, and their behavior and reduction can be affected by different treatment processes. Based on these considerations, this study investigated the behaviors of PAHs in coking wastewater under A/O2 and A/O/H/O treatment processes, respectively. In order to evaluate variations in PAH removal under two different treatment processes, samples were taken from different treatment units for quantification of PAHs using gas chromatography-mass spectrometry. Results showed that PAHs were barely degraded in anaerobic tanks of either treatment process and accumulated much higher concentrations than in aerobic and hydrolytic tanks. While low molecular weight PAHs (LMW PAHs) in aqueous phase from anaerobic tanks were degraded effectively in aerobic tanks, high molecular weight PAHs (HMW PAHs) mostly accumulated in the sludge phase; these potentially pose a higher environmental risk and therefore need to be treated separately. Moreover, the A/O/H/O process showed higher degradation of PAHs bioavailability and higher removal effectiveness for PAHs with four or more benzene rings than the A/O2 process; this is attributed to the hydrolytic tank's ability to promote hydrolysis of macromolecular organic compounds and therefore improve biodegradability of PAHs. Comprehensive results from the study indicated that the A/O/H/O process is more advantageous for degradation of PAHs than the A/O2 process. |
