Wyniki wyszukiwania - BazTech

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Pollution status and health risk assessment of a specific organophos-phate pesticide-contaminated site

Jin Zhibo, Chun-Yan Diao, Li Jianfeng

Environment Protection Engineering

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2024

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Vol. 50, nr 3

89--197

EN

Organophosphate pesticide pollution is a severe global environmental issue, posing significant threats to human health. This study focuses on an organophosphate pesticide production site in North China. Controlled soil and groundwater were sampled using grid sampling and direct-push technology. Analytical methods such as headspace gas chromatography-mass spectrometry (GC-MS), gas chromatography (GC), and purge and trap GC-MS were employed to detect contaminants, including volatile organic compounds (VOCs), semi-volatile organic compounds (SVOCs), pesticides, and heavy metals. The results indicate that the maximum exceedances in the contaminated soil for benzene, xylene, tri-chloromethane, Parathion, phosphorodithioic acid, Phorate, and Terbufos were 490.63, 411.22, 3459.09, 507.89, 277.29, 1946.15, and 281.5 times the standard limits, respectively. In groundwater, benzene, dichloromethane, trichloromethane, and Phorate exceeded the standard limits by 220.83, 1374, 1853.33, and 806.67 times, respectively, severely contaminating the local soil and groundwater and damaging the eco-system. Additionally, the carcinogenic risk values in the contaminated soil for benzene, toluene, phenylethane, xylene, 1,3,5-trimethylbenzene, 1,2,4-trimethylbenzene, Parathion, 1,2,4-trichlorobenzene, tri-chloromethane, naphthalene, and aniline were 2.75E–3, 1.36E–2, 1.034E–2, 9.72E–1, 1.5E–3, 8.9E–3, 1.85E–3, 4E–3, 3.48E–2, 2.7E–2, 1.03E–3, respectively. In groundwater, toluene, xylene, dichloromethane, and trichloromethane showed carcinogenic risk values of 8E–3, 1.86E–2, 1.23E–2, 3.07E–2, respectively, significantly exceeding the acceptable limits and posing severe threats to the health of nearby residents. Furthermore, the hazard quotient for non-carcinogenic effects of Cypermethrin in soil was 1.15, and 2,6-dichlorophenol in groundwater was 1.22, both slightly above the standard, indicating a mild impact on the health of nearby residents. Overall, this study provides a theoretical basis for subsequent remediation work at the contaminated site through pollutant analysis.

2

Power supply risk assessment method for relay protection system faults

Tuyou S., Jiekang W., Weideng Y., Anan D.

Archives of Electrical Engineering

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2016

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Vol. 65, nr 4

803--814

EN

The influence and the potential risk due to hidden faults of a relay protection system on power supply in distribution systems are paid more and more attention to. A probability analysis method is used to analyse fault characteristics and action mechanism of dominant faults, hidden misoperation and non-operation of the relay protection systems, and failure probability model of relay protection system is constructed and simplified. The effects of dominant faults, hidden misoperation and non-operation of the relay protection systems on the reduced power supply load power are analysed, and a probabilistic model for reduced power supply load power is constructed by three parts corresponding to dominant faults, hidden misoperation and non-operation. A probability calculation method of power supply risk occurrence due to hidden faults of relay protecttion system is proposed considering the fault probability of the relay protection systems, the frequency of the hidden faults occurring in operation period, the reduced power supply load power or load power outage, and the connection mode of the in-lines, out-lines and transformers in a substation. The feasibility and applicability of the proposed method for estimation of risk value probability of the relay protection systems is verified by two studied examples.

3

Risk assessment for ERP system implementation

Nafkha R., Strzęciwilk D.

Information Systems in Management

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2014

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Vol. 3, No. 3

182--192

EN

In this article, based on the results of questionnaire sent to 50 companies with different employment size, events affecting the failures of the ERP system implementation were identified and their risk level as well as additional costs related to preventive actions (reducing the probability or effects of the problem occurrence) were investigated. To evaluate the risk values of chosen ERP system implementation tasks, PMI (Project Management Institute) standard was applied.