| With the rapid development of China’s economy, people are demanding water quality increasingly, but due to the effects of erosion, sewage, water pollution and other factors, Surface water component gradually become more complex, conventional water treatment processes, it is difficult to completely remove water, trace organic pollutants, most of which are health hazards to human health. These organic contaminants can be enriched through the food chain, into people’s body, it also can cause chronic poisoning. Thus, the impact of organic matter in water on the human body has attracted much more attention. PAHs are a ubiquitous class of water environment of toxic organic pollutants, and polycyclic aromatic hydrocarbons (PAHs) in an aqueous environment by chemical or microbial action which can be converted into substituted polycyclic aromatic hydrocarbons (SPAHs), which may have a stronger SPAHs toxicity and the "three consistency" and thus endanger human health.Paper chose the parent PAHs and MPAH, OPAH and NPAH, the three typical SPAHs target contaminants. Since few studies on SPAH of water, so the lack of PAH such as sophisticated analytical methods. First, the application is capable of measuring a set of these three categories SPAH and pre-treatment methods and instrumental analysis of 16 kinds of priority control PAH simultaneously. Further verify the reliability and accuracy of the method, this paper studied the detection limit and the limit of quantification in the aqueous phase of the sample ng/L of magnitude, while the standard deviation was also lower than 20%. Description of the method of wastewater treatment plants can sample matrix for accurate and stable detection, successful understanding of the target concentration level in the wastewater treatment plant.In order to investigate the wastewater plant PAHs and SPAHs existence and secondary treatment and regeneration of different water treatment processes for their removal, for a total of four Beijing and Guangdong wastewater treatment plants and SPAHs, PAHs were detected, while the recycled water has been assessed on health risk. The results showed that:the influent concentration from the point of view, four wastewater treatment plants, low aromatic hydrocarbon concentration (191.8～394.2 ng · L-1) was significantly higher than the high aromatic hydrocarbons (89.3～ 108.2 ng · L-1); SPAHs in OPAHs total concentration (253.8～ 322.2 ng · L-1) was higher than the methyl substituent (MPAHs, 44.3～220.4 ng ·L-1). Different secondary treatment processes for the removal of PAHs was 43.7%～58.2%, to SPAHs removal rate was 45.8%～52.1%. Different Recycled water treatment processes for removal of PAHs and SPAHs large difference, PAHs removal in the range of 1.8%～41.1%, SPAHs removal rate in the range of 2.35%～25.9%. The results showed that the removal of the object-based biodegradable, moreover, adsorbed on solid particles, with particle precipitation to remove one of the main ways. By wastewater treatment plant reclaimed water risk assessment, Benzo [a] pyrene (BaP) and Dibenzo [a, h] anthracene (DBA) two kinds of carcinogens in TEQ concentrations were higher than 1, the larger their cancer risk, safety they remain to be improved. |
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