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| Until recently, nearly all sewage treatment-related regulations and researches have focused on the removal of the conventional and toxic pollutants from liquid effluents. The discharge of toxic compounds to the atmosphere has been implicitly regarded as a way of removal or destruction. During sewage treatment, the fate mechanism of volatilization/stripping, sorption and biotransformation primarily determines the fate of volatile HAPs. The objectives of this study are to investigate the emission characteristics of HAPs, which are generated from the liquid surface of sewage treatment facilities, by using an emission isolation flux chamber. HAP emissions increased at the inlet of the aerobic chamber during summer due to the relatively high atmospheric temperature. The percent ratio of flux for toluene reached its peak in winter, accounting for 33.6–34.2% of the total, but decreased to 25.1–28.6% in summer. In autumn, trichloroethene (TCE) was the highest, recording 17.6–18.1%, with chloroform and toluene showing similar levels. It seems that the ratio of chlorinated hydrocarbons increases in both summer and autumn because the chamber temperature during that time is higher than winter. This study is the initial study to investigate the emission characteristics of volatile HAPs emitted from domestic sewage treatment facilities to the air in Korea. Therefore, the isolation flux chamber will be used as an emission estimations tool to measure HAPs from sewage treatment facilities and may be applied to develop the emission factor and national source inventory of HAPs. |
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| 現(xiàn)在為止,幾乎所有與污水處理相關的法規(guī)和研究都集中在液體中常規(guī)及有毒污染物的去除方面。將有毒化合物排放到大氣中已逐漸被視為排除或銷毀的方式。污水處理過程中,一定的揮發(fā)/剝離,吸附和生物轉(zhuǎn)化的機理決定了HAPS的結果。本研究使用一個隔離的排放通量室,通過研究污水處理設施產(chǎn)生的排放液的表面特性,從而達到調(diào)查HAPS的目的。夏季由于氣溫相對較高,HAP的排放量在有氧室的入口處增加,在冬季,甲苯在通量中的比例為33.6-34.2%,達到峰值;但在夏季下降到25.1-28.6%。在秋季,三氯乙烯(TCE的)含量最高,為17.6-18.1%,與氯仿,甲苯含量相當。無論在夏季或秋季,由于溫度都比冬天高,氯化烴在通量中的比例也會增加。本研究初步調(diào)查了從韓國生活污水處理設施排放到大氣中的揮發(fā)性HAPS的排放特性,隔離通量室將被用作排放估算工具來測量污水處理設施產(chǎn)生的HAPS,也許可用于開發(fā)排放因子和HAPS的國家來源清單。 |
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