Development of a system dynamics model for polycyclic aromatic hydrocarbons and its application to assess the benefits of pollution reduction

“…For example, QWASI is a simplified lake model. The purpose is to analyze and calculate the chemical exchange of chemicals in water, air and water-sediment and the chemical transformation in a single phase, so it is not suitable for chemical behavior analysis of land and rivers; EQC sets up a fixed multimedia environment system, which cannot be directly used for regional environment simulation; SimpleBox, CalTOX, ChemCAN, and TaPL3 can be applied to chemicals in regions On the distribution and risk assessment of environmental media, the reliability of the models have been verified [18][19][20][21][22][23][24][25][26][27].The fugacity model also has obvious shortcomings, because the existing fugacity models assume that the spatial characteristics of each medium are uniform, that is, the fugacity of each point in each medium is equal. If the model is used for heterogeneous phases, the behavior characteristics of pollutants cannot be reflected spatial variability, the accuracy of the model would be reduced.…”

Section: Multimedia Model Calculationmentioning

confidence: 99%

Environmental Occurrence and Ecological Risk of Bisphenol A in Erhai Lake Basin Away From Industrial Regions in China

Shen¹,

Sui²,

Feng³

et al. 2020

Pol. J. Environ. Stud.

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The environmental distribution and migration of bisphenol A (BPA) has attracted attention due to its widespread use. The Erhai Lake Basin is dominated by agricultural production and tourism, and almost no industry. In this research, BPA pollution in the non-industrial region was investigated. BPA was found in all samples of inflow rivers, with concentrations ranging 2.80 ng/L~61.85 ng/L. The measured 15 rivers that account for 78.7% of the total inflow volume were inputting BPA concentration of 20.69 ng/L into Erhai Lake with an annual load of 8.54 kg/year. The measured BPA removal efficiency of sewage treatment plants ranged 49.8%~92.8%. Oxidation Ditch and A 2 O-MBR treatment process achieved the better BPA removal efficiency. The amount of BPA discharged directly to Erhai Lake from the effluent of the sewage plants each year was 1.63 kg. Based on the above research, a multimedia model of QWASI was established, and water concentration calculated was 0.203ng/L. A PNEC value considering more sensitive receptors was applied to this study, and it was indicated that there was a certain ecological risk in the water of the Boluo River estuary, while other rivers and lake were relatively safe. It was revealed that the ecological risk of BPA was relatively low in the Erhai Lake.

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“…PAHs are characterized by rings that share carbon atoms and a common aromatic pi electron cloud (Fessenden & Fessenden, 1986), such as naphthalene or camphor. Naphthalene is often used as a deodorizer, antiseptic, and moth repellent (Chen et al, 2018). The example of naphthalene or camphor can be seen in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

The Effect of the RADEC Model on Conceptual Understanding of Polycyclic Aromatic Hydrocarbons (PAHs) Topic

Hayati,

Kadarohman,

Sopandi

et al. 2023

JSSH

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This study was conducted to analyze the conceptual understanding of students and their struggle on Polycyclic Aromatic Hydrocarbons (PAHs) compounds topic through the implementation of the RADEC Model. Respondents consisted of 37 students from Chemistry Education Department and 33 students from the Chemistry Department at a university in Bandung, Indonesia. This study is an experimental study with a pre-experimental type. Data on conceptual understanding were obtained through pre-tests and post-tests, while data on students’ difficulties were obtained through survey. The data were analyzed using SPSS 24. It was found that there was an increase in the conceptual understanding of the students of Chemistry Education and Chemistry Department in the medium category with n-gain values of 0.33 and 0.38, respectively. The results of inferential analysis through the Wilcoxon Test with Asymp. Sig. (2-tailed) were <0.05 for the two groups of students indicating differences in the pre-test and post-test results with a higher average post-test score. Friedel-Crafts acylation is a concept that is difficult to understand by students from the Chemistry Education Department and the Chemistry Department with the same percentage of 33%. Chemistry Department students also have difficulty understanding the electrophilic substitution concept with a percentage of 33%. As a practical implication, this study successfully showed the effective implementation of the RADEC model, serving as an innovative and beneficial learning approach. The model offered substantial support to students in grasping complex topic such as PAHs compounds.

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Development of a system dynamics model for polycyclic aromatic hydrocarbons and its application to assess the benefits of pollution reduction

Cited by 7 publications

References 39 publications

Production, removal and fate of steroid estrogens under the background of total sewage interception in the Erhai Lake Basin, China

Production, removal and fate of steroid estrogens under the background of total sewage interception in the Erhai Lake Basin, China

Environmental Occurrence and Ecological Risk of Bisphenol A in Erhai Lake Basin Away From Industrial Regions in China

The Effect of the RADEC Model on Conceptual Understanding of Polycyclic Aromatic Hydrocarbons (PAHs) Topic

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