Determination of Polychlorinated Naphthalenes in Landfill Leachates and its Removal in Wastewater Treatment Processes

Q3 Environmental Science

Journal of Water and Environment Technology Pub Date : 2021-01-01 DOI:10.2965/JWET.20-135

Koji Ito, H. Kameoka, J. Ono, A. Banno, Y. Yabuki

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引用次数: 1

Abstract

Di-through octachlorinated naphthalenes (DiCNs, TrCNs, TeCNs, PeCNs, HxCNs, HpCNs and OcCN) in landfill leachates can be analyzed with the same cleanup procedure as dioxins. In this study, a modified method was developed by confirming the elution order of each isomer of polychlorinated naphthalenes (PCNs) in a chromatogram of a gas chromatograph/high resolution mass spectrometer (GC/HRMS) using an Rh-12 ms capillary column, which is mainly employed for the analysis of dioxins. Using this method, PCNs in landfill leachate samples and treated leachate samples from each corresponding wastewater treatment process were quantified. PCN concentrations in landfill leachates ranged from 8.0–12,000 pg/L, and DiCNs-PeCNs were detected in almost all samples. Removal of PCNs by flocculation and active carbon treatment was greater than that achieved by activated sludge treatment in wastewater treatment plants. Furthermore, by changing the temperature of the H2SO4 coated silica gel column in the modified method, it became possible to measure monochlorinated naphthalenes (MoCNs), which could not be measured previously. MoCN concentrations detected were much higher compared to concentrations of DiCNs-OcCN in most of landfill leachates. Unlike PCNs, MoCNs are not POPs, but they are nevertheless important for understanding the properties of landfill leachates.

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垃圾渗滤液中多氯萘的测定及其在废水处理过程中的去除

垃圾填埋场渗滤液中的二透八氯化萘(DiCNs、TrCNs、TeCNs、PeCNs、HxCNs、HpCNs和OcCN)可采用与二恶英相同的清理程序进行分析。本研究采用主要用于二恶英分析的Rh-12 ms毛细管柱，在气相色谱仪/高分辨率质谱仪(GC/HRMS)色谱图中确定多氯萘(PCNs)各异构体的洗脱顺序，建立了一种改进的方法。利用该方法，对各相应废水处理工艺的垃圾渗滤液样品和处理后的渗滤液样品中的pcn进行了定量分析。垃圾渗滤液中PCN浓度范围为8.0 ~ 12000 pg/L，几乎所有样品中都检测到dicns - pecn。絮凝和活性炭处理对PCNs的去除率大于污水处理厂的活性污泥处理。此外，在改进的方法中，通过改变H2SO4包覆硅胶柱的温度，可以测量以前无法测量的单氯化萘(mocn)。在大多数垃圾渗滤液中检测到的MoCN浓度远高于DiCNs-OcCN浓度。与pcn不同，mocn不是持久性有机污染物，但它们对于了解垃圾填埋场渗滤液的特性仍然很重要。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Water and Environment Technology Environmental Science-Water Science and Technology

CiteScore

1.80

自引率

0.00%

发文量

审稿时长

43 weeks

期刊介绍： The Journal of Water and Environment Technology is an Open Access, fully peer-reviewed international journal for all aspects of the science, technology and management of water and the environment. The journal’s articles are clearly placed in a broader context to be relevant and interesting to our global audience of researchers, engineers, water technologists, and policy makers. JWET is the official journal of the Japan Society on Water Environment (JSWE) published in English, and welcomes submissions that take basic, applied or modeling approaches to the interesting issues facing the field. Topics can include, but are not limited to: water environment, soil and groundwater, drinking water, biological treatment, physicochemical treatment, sludge and solid waste, toxicity, public health and risk assessment, test and analytical methods, environmental education and other issues. JWET also welcomes seminal studies that help lay the foundations for future research in the field. JWET is committed to an ethical, fair and rapid peer-review process. It is published six times per year. It has two article types: Original Articles and Review Articles.