Fate of Polycyclic Aromatic Hydrocarbon (PAHs) in Urban Lakes under Hydrological Connectivity: A Multi-Media Mass Balance Approach

IF 7.6 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Shizhao Zhang, Xinli Xing, Haikuo Yu, Minkai Du, Yuan Zhang, Peng Li, Xin Li, Yanmin Zou, Mingming Shi, Weijie Liu, Shihua Qi
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引用次数: 0

Abstract

Polycyclic aromatic hydrocarbons (PAHs) are a class of organic pollutants widely present in various environmental media. Some PAHs have carcinogenic, teratogenic, and mutagenic effects. Urban lakes are severely polluted by PAHs due to human activities. Longyang Lake (LL) and Moshui Lake (ML), which serve as entry lakes for Wuhan's “Six Lakes Connectivity” project, were chosen as the study areas to learn about the migration of PAHs. Water flows from LL to ML through the Mingzhu River. Multi-Media Mass Balance Model (MMBM) and fugacity fractions (ff) were used to characterize the migration of PAHs under the hydrological connectivity project. Compared to , the MMBM can describe the migration of PAHs in a more detailed and quantitative way. The concentration of PAHs in water of LL decreased from 36.5 ng·L-1 to 26.59 ng·L-1 over 43 days, while those in ML increased from 46.8 ng·L-1 to 198.25 ng·L-1 over 141 days. Sediment takes a longer time to decrease to stabilization. The concentration of PAHs in the sediment of LL decreased from 932 ng·g-1 to 0.95 ng·g-1 over 13.33 years, while those in ML decreased from 4812 ng·g-1 to 1.04 ng·g-1 over 16.96 years. The stabilized concentrations were consistently lower than the observed concentrations and fell below the modeled stabilized concentrations obtained in the unconnected case (2170 ng·L-1 in water and 40.81 ng·g-1 in sediment). The MMBM showed that PAHs in the lake are mainly exported through runoff. However, modeling results indicated that upstream LL did not increase total PAHs concentrations in the ML because the output from ML was significantly higher. Sediment parameters sensitively influenced the results of the model. Although the simulation results showed reductions of PAHs pollution in two lakes under the hydrological connectivity project, long-term monitoring results are needed to optimize the model.

Abstract Image

水文连通性下城市湖泊中多环芳烃(PAHs)的去向:一种多媒体物质平衡方法
多环芳烃(PAHs)是一类广泛存在于各种环境介质中的有机污染物。一些多环芳烃具有致癌、致畸和致突变作用。由于人类活动,城市湖泊受到多环芳烃的严重污染。选择武汉市“六湖联通”工程的入口湖龙阳湖和磨水湖作为研究区,研究多环芳烃的迁移情况。水通过明珠河从LL流到ML。利用多媒体质量平衡模型(MMBM)和逸度分数(ff)表征了水文连通性工程下多环芳烃的迁移特征。相比之下,MMBM可以更详细和定量地描述多环芳烃的迁移。在43 d内,LL水体中多环芳烃浓度从36.5 ng·L-1下降到26.59 ng·L-1, ML水体中多环芳烃浓度从46.8 ng·L-1上升到198.25 ng·L-1。泥沙减少到稳定需要较长的时间。LL沉积物中多环芳烃浓度在13.33 a内从932 ng·g-1下降到0.95 ng·g-1, ML沉积物中多环芳烃浓度在16.96 a内从4812 ng·g-1下降到1.04 ng·g-1。稳定浓度始终低于观测到的浓度,并且低于未连接情况下获得的模型稳定浓度(水中2170 ng·L-1,沉积物40.81 ng·g-1)。MMBM结果表明,湖泊中的多环芳烃主要通过径流输出。然而,模拟结果表明,上游LL并没有增加ML中的总PAHs浓度,因为ML的输出明显更高。泥沙参数对模型结果影响较大。虽然模拟结果显示水文连通工程下两个湖泊的多环芳烃污染有所减少,但需要长期的监测结果来优化模型。
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来源期刊
Environmental Pollution
Environmental Pollution 环境科学-环境科学
CiteScore
16.00
自引率
6.70%
发文量
2082
审稿时长
2.9 months
期刊介绍: Environmental Pollution is an international peer-reviewed journal that publishes high-quality research papers and review articles covering all aspects of environmental pollution and its impacts on ecosystems and human health. Subject areas include, but are not limited to: • Sources and occurrences of pollutants that are clearly defined and measured in environmental compartments, food and food-related items, and human bodies; • Interlinks between contaminant exposure and biological, ecological, and human health effects, including those of climate change; • Contaminants of emerging concerns (including but not limited to antibiotic resistant microorganisms or genes, microplastics/nanoplastics, electronic wastes, light, and noise) and/or their biological, ecological, or human health effects; • Laboratory and field studies on the remediation/mitigation of environmental pollution via new techniques and with clear links to biological, ecological, or human health effects; • Modeling of pollution processes, patterns, or trends that is of clear environmental and/or human health interest; • New techniques that measure and examine environmental occurrences, transport, behavior, and effects of pollutants within the environment or the laboratory, provided that they can be clearly used to address problems within regional or global environmental compartments.
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