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۱Changes in the Polyaromatic Hydrocarbon Contents of a Waste Engine Oil Polluted Soil Exposed to Different Periods of Monitored Natural Attenuation
اطلاعات انتشار: World Applied Sciences Journal، بيست و هشتم،شماره۱۱، ۲۰۱۳، سال
تعداد صفحات: ۹
Changes in the polyaromatic hydrocarbon contents of a waste engine oil (WEO) polluted soil exposed to different periods of monitored natural attenuation was comparatively investigated. Soil was previously polluted with WEO at 0, 1, 2.5, 5 and 10% w\w oil in soil and left undisturbed for varying periods of 1, 5, 10 and 14 months following pollution (MAP). Results showed that total polyaromatic hydrocarbon (PAH) content of soil in the 1% w\w oil in soil treatment (SP1) decreased from 292.5 mg\l in the first month (1 MAP) to 34.87mg\l at 14 MAP, representing a 88.08% reduction in PAH contents. At 5 MAP, benzo[b]fluoranthene was undetected, as against initial concentration of 0.21mg\l at 1 MAP. Similarly, chrysene and indeno[1,2,3–c,d]pyrene were undetected at 5 MAP. The concentration of fluoranthene was 11.54mg\l at 1 MAP and 0.07mg\l at 10 MAP. The compound was however undetected in the 14th month. Total remediation of benzo[b]fluoranthene and chrysene was possible in the 5th month in the 5%w\w (SP ) treatment and chrysene 5 in the 10%w\w oil in soil treatment (SP10). There was significant (p>0.05) reduction in indeno[1,2,3–c,d]pyrene from 2.44mg\l in the 1st month to 1.17mg\l at 14 MAP. Similarly, benzo[k]fluoranthene decreased from 307.44mg\l – 160.27mg\l in SP10 over a period of 13 months, representing a 47.21% decrease in concentration. Probable effect concentration quotients (PECQ’s) showed that toxicity was indicated for acenaphthene, benzo[b]fluoranthene, dibenzo[a,h]anthracene, fluorene, indeno[1,2,3–c,d]pyrene and naphthalene in all the levels of pollution considered (i.e. SP1.0 – SP 10.0) at 5 MAP. However at 14 MAP, PECQ’s indicated that toxicity was not indicated for benzo[b]fluoranthene and benzo[g,h,i]perylene. Toxicity was indicated for every other PAH compounds at all the levels of pollution considered.
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