| 污水处理厂中有机磷阻燃剂的污染特征 |
| 摘要点击 2162 全文点击 652 投稿时间：2017-09-12 修订日期：2017-11-16 |
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| 中文关键词 污水处理厂 有机磷阻燃剂 氧化沟 A2/O |
| 英文关键词 wastewater treatment plant organophosphorus flame retardant (OPFRs) oxidation ditch A2/O |
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| 中文摘要 |
| 为了研究污水处理厂中有机磷阻燃剂（organophosphorus flame retardants，OPFRs）的污染特征，于2017年采集苏州市8个污水处理厂（7个A2/O工艺与1个氧化沟工艺）的进水、二沉池出水、污水厂出水、生物池污泥以及脱水剩余污泥.采用加速溶剂萃取（ASE）-固相萃取方法测定了污水与污泥中10种OPFRs的浓度，并比较了两种不同工艺各个工艺段OPFRs的去除效果，估算了最终排入环境的日均排放量.结果表明：7种OPFRs在进水、出水、污泥中均有检出，进水和总出水中OPFRs总浓度范围分别为0.74~222.65 μg·L-1和0.46~175.41 μg·L-1，均值分别为65.56 μg·L-1和22.99 μg·L-1；二沉池出水中OPFRs总浓度为0.48~178.14 μg·L-1，均值为43.14 μg·L-1；估算污水厂出水中OPFRs日排放量为36.69~2177.12 g·d-1.剩余污泥中OPFRs总含量（以干重计）范围为89.32~596.24 μg·g-1，均值（以干重计）为249.35 μg·g-1，剩余污泥中OPFRs的日排放量最小为3.57~7.15 kg·d-1，最大为47.70~95.40 kg·d-1.氧化沟工艺对OPFRs有较好去除，去除率达到92%；A2/O工艺则为11%~99%，差异性较大.3种氯代类的OPFRs[分别为磷酸三（2-氯乙基）酯、磷酸三（1-氯-2-丙基）酯、磷酸三（1，3-二氯-2-丙基）酯]是进水与出水中主要成分，主要由于氯代OPFRs的使用量大和传统污水处理技术对其去除率低. |
| 英文摘要 |
| Sewage water, the influent of the secondary sedimentation tanks, the final effluent, sludge from biological pools, and dewatered excess sludge samples from eight wastewater treatment plants (WWPTs) in Suzhou, including those from seven A2/O processes and one oxidation ditch process, were collected in 2017 to study the pollution characteristics of organophosphorus flame retardants (OPFRs) in WWPTs. Accelerated solvent extraction (ASE) combined with a solid-phase extraction method was used to detect the concentration of 10 organic phosphorus flame retardant (OPFRs). The removal efficiency of OPFRs was compared and final daily emissions were estimated. The results showed seven kinds of OPFRs were detected in the influent, final effluent, and sludge. The total content of OPFRs in the influent ranged from 0.74 to 222.65 μg ·L-1 (average 65.56 μg ·L-1), while the content in the final effluent was between 0.46 and 175.41 μg ·L-1 (average 22.99 μg ·L-1). The concentration in the effluent of the secondary sedimentation tank was between 0.48 and 178.14 μg ·L-1 (average 43.14 μg ·L-1). The daily emission of OPFRs in final effluent was 36.69-2177.12 g ·d-1. The content in the dewatered excess sludge was between 89.32 and 596.24 μg ·g-1 dw (average 249.35 μg ·g-1 dw), the minimum daily emission was 3.57-7.15 kg ·d-1, and the maximum was 47.70-95.40 kg ·d-1. The oxidation ditch process has a good removal rate of OPFRs, at 92%, while the A2/O process removal rate covered a large range from 11%-99%. Three chlorinated OPFRs, TCEP, TCPP, and TDCPP, were the main components in the influent and final effluent, mainly because of the large consumption of OPFRs and also because the removal rate by the traditional wastewater treatment technology was low. |
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