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首页> 外文期刊>Environmental Science & Technology >Combined Bioaugmentation and Biostimulation To Cleanup Soil Contaminated with High Concentrations of Atrazine
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Combined Bioaugmentation and Biostimulation To Cleanup Soil Contaminated with High Concentrations of Atrazine

机译：生物强化与生物刺激相结合，净化高浓度of去津污染的土壤

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We developed a joint bioaugmentation and biostimulation approach for the clean up of soil contaminated with high (168.7 and 337.4μg g{sup}(-1)) concentrations of the herbicide atrazine (2-chloro-4-(ethylamino)-6-isopropylamino-s-triazine). Pseudomonas sp. strain ADP (P. ADP) was used for bioaugmentation (～10{sup}7 cells g{sup}(-1) soil), and citrate (concentration range 5.8-40 mg g{sup}(-1) soil) and succinate (6.2-30.8 mg g{sup}(-1)) were used for biostimulation. The study soil had indigenous potential for atrazine mineralization (54.4 ± 2% of 168.7 μg g{sup}(-1) mineralized after 67 day), but rapid mineralization only took place after a prolonged acclimation phase (～28 days). Inoculation with P. ADP alone resulted in a limited improvement in mineralization (e.g., 30.6 ± 1% mineralization of 168.7 μg g{sup}(-1) of atrazine in inoculated soil cf. <0.5% in noninoculated in 7 days). Quantification of surviving numbers of P. ADP revealed a 10-fold decline from initial levels. However, bioaugmentation together with citrate or succinate biostimulation markedly increased P. ADP cell survival and atrazine mineralization (e.g., addition of 11.6 mg g{sup}(-1) of citrate increased mineralization of 337.4μg g{sup}(-1) of atrazine from <2 to 79.9 ± 1% in 13 days). A critical parameter in determining the extent of atrazine mineralization by P. ADP was C{sub}s:N{sub}(atz) (soluble carbon to atrazine nitrogen ratio): C{sub}s:N{sub}(atz) > 40 was required for maximal atrazine mineralization. We suggest our observations may be used as a framework for rational bioremediation of field soils contaminated with atrazine.
机译：我们开发了一种联合生物强化和生物刺激方法，用于清理被高浓度（168.7和337.4μgg {sup}（-1））除草剂at去津（2-氯-4-（乙基氨基）-6-异丙基氨基）污染的土壤-s-triazine）。假单胞菌ADP（P. ADP）菌株用于生物强化（〜10 {sup} 7细胞g {sup}（-1）土壤）和柠檬酸盐（浓度范围5.8-40 mg g {sup}（-1）土壤）和琥珀酸酯（6.2-30.8 mg g {sup}（-1））用于生物刺激。研究的土壤具有阿特拉津矿化的固有潜力（67天后矿化度为168.7μgg {sup}（-1）的54.4±2％），但快速矿化仅在长时间的适应阶段（​​约28天）后发生。单独接种P.ADP会导致矿物质的改善有限（例如，接种土壤中阿特拉津的168.7μgg {sup}（-1）的矿化率为30.6±1％，而非接种7天为<0.5％）。对存活的P. ADP数量进行定量分析显示，与初始水平相比下降了10倍。然而，生物强化与柠檬酸或琥珀酸的生物刺激一起显着增加了P. ADP细胞的存活率和阿特拉津的矿化作用（例如，添加11.6 mg g {sup}（-1）的柠檬酸盐会增加337.4μgg {sup}（-1）的矿化度。在13天内将r去津从<2降至79.9±1％）。确定P.ADP形成at去津矿化程度的关键参数是C {subss：N {sub}（atz）（可溶性碳与at去津氮之比）：C {sub} s：N {sub}（atz）最大阿特拉津矿化需要> 40。我们建议将我们的观察结果用作合理的生物修复被at去津污染的田间土壤的框架。

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