Manipulation of Unfrozen Water Retention for Enhancing Petroleum Hydrocarbon Biodegradation in Seasonally Freezing and Frozen Soil,Environmental Science & Technology

当前位置： X-MOL 学术 › Environ. Sci. Technol. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Manipulation of Unfrozen Water Retention for Enhancing Petroleum Hydrocarbon Biodegradation in Seasonally Freezing and Frozen Soil
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2021-06-22 , DOI: 10.1021/acs.est.0c07502
Jihun Kim ₁ , Aslan Hwanhwi Lee ₁ , Wonjae Chang ₁

Affiliation

Manipulating the retention of unfrozen water in freezing contaminated soil to achieve prolonged bioremediation in cold climates remains unformulated. This freezing-induced biodegradation experiment shows how nutrient and zeolite amendments affect unfrozen water retention and hydrocarbon biodegradation in field-aged, petroleum-contaminated soils undergoing seasonal freezing. During soil freezing at a site-specific rate (4 to −10 °C and −0.2 °C/d), the effect of nutrients was predominant during early freezing (4 to −5 °C), alleviating the abrupt soil-freezing stress near the freezing-point depressions, elevating alkB1 gene-harboring populations, and enhancing hydrocarbon biodegradation. Subsequently, the effect of increased unfrozen water retention associated with added zeolite surface areas was critical in extending hydrocarbon biodegradation to the frozen phase (−5 to −10 °C). A series of soil-freezing characteristic curves with empirical α-values (soil-freezing index) were constructed for the tested soils and shown alongside representative curves for clays to sands, indicating correlations between α-values and nutrient concentrations (soil electrical conductivity), zeolite addition (surface area), and hydrocarbon biodegradation. Heavier hydrocarbons (F3: C16–C34) notably biodegraded in all treated soils (22–37% removal), as confirmed by biomarker-based analyses (17α(H),21β(H)-hopane), whereas lighter hydrocarbons were not biodegraded. Below 0 °C, finer-grained soils (high α-values) can be biostimulated more readily than coarser-grained soils (low α-values).

中文翻译：

操纵未冻水保持力促进季节性冻土中石油烃生物降解

在寒冷气候下操纵未冻结水在受冻污染的土壤中保留以实现长期生物修复的方法仍未制定。这种冷冻诱导的生物降解实验显示了养分和沸石改良剂如何影响经历季节性冷冻的田间老化、石油污染土壤中的未冻水保留和碳氢化合物生物降解。在特定地点（4至-10°C和-0.2°C / d）的土壤冻结期间，早期冻结（4至-5°C）期间养分的影响占主导地位，缓解了突然的土壤冻结压力在冰点凹陷附近，升高alkB1携带基因的种群，并增强碳氢化合物的生物降解。随后，与增加的沸石表面积相关的未冻结水保留增加的影响对于将烃生物降解扩展到冻结相（-5 至 -10°C）至关重要。为测试土壤构建了一系列具有经验 α 值（土壤冻结指数）的土壤冻结特征曲线，并与粘土到沙子的代表性曲线一起显示，表明 α 值与养分浓度（土壤电导率）之间的相关性，沸石添加（表面积）和碳氢化合物生物降解。重质碳氢化合物（F3：C16-C34）在所有处理过的土壤中显着生物降解（去除 22-37%），正如基于生物标志物的分析（17α(H),21β(H)-hopane）所证实的，而轻质碳氢化合物没有被生物降解. 0℃以下，

更新日期：2021-07-06

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11