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盐酸羟胺促进分级Fenton氧化土壤长链原油的试验研究
徐金兰, 刘博雅
西安建筑科技大学环境与市政工程学院
摘要:
H2O2分次投加可以提高石油烃(total petroleum hydrocarbons, TPH)去除率,本试验选用900 mmol/L H2O2分3次投加的方式进行分级Fenton氧化修复长链原油污染土壤。在Fe2+、固相铁、Fe2+ +盐酸羟胺、固相铁+盐酸羟胺4种催化体系下进行试验,发现在向Fe2+ 体系和固相铁体系加入盐酸羟胺后,后两级反应?OH强度明显增强,是未加入盐酸羟胺体系下的3倍 ~ 4倍,TPH及长链烃氧化量也大幅提高。采用向Fenton体系中加入盐酸羟胺的方式,克服了分级Fenton氧化过程中由于Fe2+不足导致?OH强度较第一级显著降低、TPH及长链烃氧化量大幅下降的缺陷,促进了后两级反应过程中?OH的产生,从而大大提高了后两级TPH及长链烃的去除效果,使后两级去除效果与第一级接近,能够维持在较高水平,为急需短时间进行的土壤修复提供了一定的理论依据。
关键词:  H2O2分次投加  盐酸羟胺  •OH强度  长链烃  氧化效果
DOI:10.13758/j.cnki.tr.2020.03.017
分类号:X53
基金项目:国家自然科学基金项目(51778524)资助。
Experimental Study of Hydroxylamine Hydrochloride on Improving Fenton Oxidation of Long Chain Crude Oil in Soil
XU Jinlan, LIU Boya
School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology
Abstract:
The removal rate of total petroleum hydrocarbons (TPH) can be improved by stepwise addition of H2O2, and the 900 mmol/L H2O2 was divided into 3 times for stepwise Fenton oxidation to remediate the soil polluted by long chain oil in this study. Experiment was conducted under the four catalysis systems, i.e., Fe2+, solid iron, Fe2++ hydroxylamine hydrochloride, solid iron + hydroxylamine hydrochloride. It was found that ?OH intensities were facilitated significantly in the last two reactions when hydroxylamine hydrochloride was added to Fe2+ and solid iron systems, which was 3–4 times of the system without hydroxylamine hydrochloride. The oxidation of TPH and long chain hydrocarbon were also greatly increased. Hydroxylamine hydrochloride could overcome the shortcomings of significant reduction of ?OH intensity than the first stage and the significant decreases of oxidation of TPH and long chain hydrocarbons which are attributed to the lack of Fe2+, facilitated significantly ?OH production in second and third stages, thus, greatly improved the removal efficiencies of TPH and long chain hydrocarbon similar to the first stage and could be maintained at a higher level. This study could provide certain theoretical bases for the urgent need for short-term soil remediation.
Key words:  Stepwise addition of H2O2  Hydroxylamine hydrochlorid  •OH intensity  Long chain hydrocarbon  Oxidation efficiency

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