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首页> 外文期刊>Environmental Science & Technology >Development of Engineered Natural Organic Sorbents for Environmental Applications. 4. Effects on Biodegradation and Distribution of Pyrene in Soils
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Development of Engineered Natural Organic Sorbents for Environmental Applications. 4. Effects on Biodegradation and Distribution of Pyrene in Soils

机译：开发用于环境应用的工程天然有机吸收剂。 4.对土壤中of的生物降解和分布的影响

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The effects of engineered natural organic amendments on the biodegradation and distribution of pyrene in soils were assessed. Pyrene was aged for 105 days in soils amended with either raw or superheated water (SHW)-processed MI peat or soybean stalks, and then subjected to biodegradation with specifically selected microorganisms for 130 days. Initial rates of pyrene mineralization in the soils were increased by addition of raw MI peat, but markedly decreased by additions of SHW-processed MI peat and both processed and raw soybean stalks. Pyrene sorbed by the processed organic sorbents was, however, slowly but steadily degraded by microorganisms over a greater than 4-month test period. Pyrene distributions in the soils were examined by sequential extractions of samples before and after biodegradation. Fractions of pyrene extracted readily with water orwater/methanol mixtures were decreased substantially in both soils by the addition of processed amendments, while the nonextractable fractions associated with humic and fulvic acids and humin were increased markedly. The results demonstrate that SHW-processed amendments effectively reduce the ecological and human availability and aqueous phase extra eta bility of organic contaminants while facilitating their steady microbial degradation and eventually complete remediation.
机译：评估了天然工程有机改良剂对of在土壤中的生物降解和分布的影响。 with在用原水或过热水（SHW）处理的MI泥炭或大豆秸秆改良的土壤中老化105天，然后用特定选择的微生物进行生物降解130天。土壤中MI的初始矿化速率通过添加未加工的MI泥炭而增加，但通过添加SHW处理的MI泥炭以及加工的和未加工的大豆秸秆而显着降低。但是，经过大于4个月的测试期间，被加工的有机吸附剂吸附的slowly被微生物缓慢而稳定地降解。通过在生物降解之前和之后依次提取样品来检查土壤中的distribution分布。通过添加加工过的改良剂，在水或水/甲醇混合物中容易提取的pyr的馏分大大减少了，而与腐殖酸，黄腐酸和腐殖质相关的不可提取馏分则显着增加。结果表明，SHW处理的修正物有效地降低了有机污染物的生态和人类利用度以及水相的额外能力，同时促进了其稳定的微生物降解并最终完成了修复。

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