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Combined Effects of Plant Cultivation and Sorbing Carbon Amendments on Freely Dissolved PAHs in Contaminated Soil
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2019-04-18 , DOI: 10.1021/acs.est.8b06265
Patryk Oleszczuk 1, 2 , Magdalena Rakowska 2 , Thomas D. Bucheli 3 , Paulina Godlewska 1 , Danny D. Reible 2
Affiliation  

We report freely dissolved concentrations (Cfree) of PAHs in soils amended with 2.5% biochar and activated carbon (AC) during a long-term (18-months) field experiment. The study evaluates also the impact of different plants (clover, grass, willow) on Cfree PAHs. The cumulative effect of treatments on nitrogen and available forms of phosphorus, potassium, and magnesium is also assessed. The direct addition of biochar to soil did not cause any immediate reduction of the sum of 16 Cfree PAHs, while AC resulted in a slight reduction of 5- and 6 ring compounds. The efficiency of binding of Cfree PAHs by biochar and AC increased with time. For biochar, the maximum reduction of 4–6-ring PAHs (18–67%) was achieved within 6 months. For 2- and 3-ring PAHs, a gradual decrease of Cfree was observed which reached 60–66% at 18 months. AC proved to be better in reducing Cfree PAHs than biochar, though for 2- and 3-ring PAHs, the differences in AC and biochar performances were smaller than those for 4–6-ring PAHs. After 18 months, a significantly lower content of Cfree PAHs was observed in the soil with plants compared to the unplanted soil. Except for potassium, AC or biochar did not negatively impact nutrient availability.

中文翻译:

耕作和分拣碳素改良剂对污染土壤中自由溶解的PAHs的联合影响

我们报告自由溶解浓度(ç自由长期(18个月)田间试验过程中有2.5%的生物炭和活性炭(AC)修正土壤多环芳烃)。该研究评估也是不同的植物(三叶草,草,柳)对影响Ç免费多环芳烃。还评估了处理对氮以及磷,钾和镁的有效形式的累积影响。将生物炭直接添加到土壤中不会立即减少16 C游离PAHs的总量,而AC会导致5和6环化合物的轻微减少。不含C的结合效率生物炭和AC的PAH随时间增加。对于生物炭,在6个月内最大减少了4-6个环的PAHs(18-67%)。对于2环和3环PAH,观察到C的逐渐降低,在18个月时达到60-66%。AC被证明是更好的在减少Ç自由多环芳烃比生物炭,虽然用于2-和3-环多环芳烃,在AC生物炭性能的差异,并较4-6环多环芳烃小。18个月后,与未种植的土壤相比,在有植物的土壤中观察到了游离C的PAHs含量明显降低。除钾,AC或生物炭外,对养分的利用率没有负面影响。
更新日期:2019-04-20
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