真菌对污染水稻土中苯并[a]芘共代谢降解研究
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EFFECTS OF FUNGI ON CO-METABOLIC DEGRADATION OF BENZO[A]PYRENE IN PADDY SOIL
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    摘要:

    在恒温和恒定转速培养条件下,模拟生物泥浆反应器法,选择从石油污染土壤中分离出来的青霉菌、黑曲霉、白腐真菌等3种真菌,在添加不同浓度菲和邻苯二甲酸作为共存底物情况下,研究其对水稻土中苯并[a]芘(B[a]P)的共代谢降解。结果表明,未灭菌土壤对B[a]P有降解能力。当土壤中添加菲时,提高了B[a]P在土壤中的降解率,100 mg kg-1浓度菲处理的降解率显著高于200 mg kg-1浓度菲处理,邻苯二甲酸对B[a]P降解影响不大。灭菌土壤中的B[a]P几乎没有降解。添加菲及邻苯二甲酸均促进了青霉菌对B[a]P的降解,其中菲浓度为100 mg kg-1处理效果最显著。与灭菌土壤相比,接种黑曲霉提高了B[a]P的降解率,但添加菲与邻苯二甲酸却均抑制了黑曲霉菌对B[a]P的降解。白腐真菌能有效地降解B[a]P,但高浓度菲抑制了白腐真菌对B[a]P的降解,同时邻苯二甲酸对促进白腐真菌降解B[a]P的效果不明显。

    Abstract:

    Simulated bioslurry remediation of PAHs contaminated soil was carried out. Three strains of fungi isolated from petroleum-contaminated soils were inoculated into paddy soils different in application rate of phenanthrene and phthalic acid, to investigate their effects of co-metabolic degradation of B[a]P therein. Results show that in natural soils, some native microorganisms were able to degrade B[a]P and addition of low molecular weight PAHs-phenanthrene increased, degradation rate of B[a]P in the soil. The effect was greater when the application rate of phenanthrene was 100 mg kg-1 than when it was 200 mg kg-1. But the addition of phthalic acid did not show much effect. In sterilized soils, degradation of B[a]P in soils was hardly observed. However, inoculation of Penicillium stimulated degradation of B[a]P in all the three treatments, i.e. phenanthrene at 100 mg kg-1, phenanthrene at 200 mg kg- and phthalic acid, but only in the treatment of phenanthrene at 100 mg kg-1 the effect was significant. Inoculation of Aspergillus niger also showed similar effect, which, however, was inhibited by the presence of phenanthrene and phthalic acid in the soil. White-rot fungus could effectively degrade B[a]P, but high concentration of phenanthrene inhibited its effect in the soils, and phthalic acid was neither an optimal co- substrates of white-rot fungus in degrading B[a]P in paddy soils.

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刘世亮,骆永明,吴龙华.真菌对污染水稻土中苯并[a]芘共代谢降解研究[J].土壤学报,2011,48(1):54-61. DOI:10.11766/trxb200904100164 Liu Shiliang, Luo Yongming, Wu Longhua. EFFECTS OF FUNGI ON CO-METABOLIC DEGRADATION OF BENZO[A]PYRENE IN PADDY SOIL[J]. Acta Pedologica Sinica,2011,48(1):54-61.

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  • 收稿日期:2009-04-10
  • 最后修改日期:2009-10-21
  • 录用日期:2009-11-03
  • 在线发布日期: 2010-10-19
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