摘要
以表面活性剂ＴＷ８０为供试物，进行了为期１５０ｄ的实验研究，并分别在３０、６０和１５０ｄ间隔采样监测ＰＡＨｓ降解率．结果表明，３０ｄ后，土壤中ＰＡＨｓ的降解率达９０％，比对照提高约３０％．６０ｄ后，浓度为１００００ｍｇ·ｋｇ－１表面活性剂的土壤和对照中，ＰＡＨｓ降解率从６５．１％和６０％迅速提高到９３．８％和７９．２％．其它处理中，ＰＡＨｓ的平均降解率仅比３０ｄ的结果提高４％．１５０ｄ后，所有处理中ＰＡＨｓ的降解率均达到９０％以上．可以认为，表面活性剂能提高ＰＡＨｓ的生物可利用性，加快ＰＡＨｓ的降解速率，从而减少污染暴露时间．但表面活性剂浓度过高可抑制微生物活性．研究还发现，ＴＷ８０土壤中含有优势真菌．经鉴定为常见青霉、蠕形青霉、淡紫青霉和顶孢头孢霉．
An experiment was conducted on the effect of surfactant TW 80 on biodegradation of
polycyclic aromatic hydrocarbons (PAHs) in soil for 150 days. Samples were collected in the
intermittence of 30, 60 and 150 days to monitor the degradation rate of PAHs. The results
indicate that after 30 days, the degradation rate reached 90%, approximately 30% higher than
that of control. After 60 days, the degradation rate with a concentration of TW 80 at 1000mg·kg
-1 and the control reached from 65.1% and 60.0% to 93.8% and 79.2%, respectively; but the
average degradation of PAHs in other treatements increased only by 4%, compared with results
of 30 days. One hundred and fifty days later, the degradation rate in all treatments was over
90%. It is suggested that surfactant can improve the bioavailability of PAHs and speed up the
degradation rate, therefore, reduce the exposure time of pollutants. But, surfactant at high
concentration can inhibit the activity of microbes. It was also found that the soil with surfactant
TW 80 contained dominant fungi which were identified as Penicillium freguentant,
P.vermiculatum, P.lilacinum and Cephalosporium acremonium, indicating that these fungi
were the driving force for rapid degradation of PAHs in soil.
出处
《应用生态学报》
CAS
CSCD
1999年第2期230-232,共3页
Chinese Journal of Applied Ecology
基金
国家自然科学基金
关键词
土壤污染
多环芳烃
表面活性剂
TW-80
降解率
Contaminated soil,
Polycyclic aromatic hydrocarbons(PAHs), Surfactant TW 80, Degradation rate, Dominant fungi.
