All posts by simiecoind

Abstract:

Surfactants are substances that reduce surface tension and they are worldwide used
in all branches of industry such as householder products, cosmeticals, pharmaceuticals, petroleum.
The large utilization of surfactants is reflected in their accumulation in the domestic and industrial wastewaters and subsequently into the waste waster treatment plants (WWTP) and the environment. Once in the environment, the surfactants could harm
it by inducing important changes in water quality which could directly affect the human life.
This paper is a monitoring study of anionic and nonionic surfactants from domestic wastewaters during three seasons (winter 2018, spring 2018 and summer 2018). The samples were taken from specific sampling points along Romanian counties: Ilfov,
Prahova, Giurgiu, Dambovita and Braila.
The results showed that the concentration of the surfactants varied between 0.85 mg/L and 6.73 mg/L for anionic surfactants and 0.81 mg/L up to 6.48 mg/L for nonionic surfactants related to the accepted value of surfactants concentration (as sum of anionic and nonionic) of 25 mg/L (Romanian legislation, HG 352/2005, NTPA 002 and Annex 2/2005). Moreover, the study revealed that the highest concentration of both anionic and nonionic surfactants were detected in Dambovita County during summer.

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Abstract:

The paper presents the preliminary results obtained in a study aimed to assess the level of air pollution with heavy metals in urban areas by means of using bioindicators. The tests were carried out in one of the most polluted cities in western Romania, using as bio-indicators corticolous lichens collected from seven representative sites for air quality in the city. The assessment level of air pollution with heavy metals (Cd, Ni, Pb, Cu, Mn, Zn, Cr) was based on the effect that their presence could induce on lichens. Thus, two methods were used for the quantification of the effect such as: a) IAP method, variation in diversity and abundance – calculation of the value of Index of Atmospheric Purity, IAP and b) determining the content of heavy metals in the lichen thalli, respectively.
Classification of air quality from the seven sampling sites in pollution classes (low pollution, moderate pollution, high pollution and very high pollution) was based on the statistical tests for correlation between the metal concentration in the air and the specific parameters for the two evaluation methods (the IAP index value for the first method and the metals concentration in the lichen thalli for the second method). The tests results revealed a differentiated air quality in the seven sites, also indicating the
method of biomonitoring with corticolous lichens as a viable option for assessing the air quality in polluted areas with heavy metals.

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Abstract:

The paper compares the results obtained by applying three calculation methodologies for the height of the chimney of a hazardous waste installation. Thermal waste treatment processes are a feasible option after recovery (collection,
sorting, recycling) and prior to controlled disposal.
Monitoring data at a hazardous waste incineration plant made it possible to calculate three heights of the incinerator emission network.
The incineration plant is thus operated in such a way that the emissions of the harmful substances of the chimney are in conformity with the VLE values transposed into the national legislation by Law no. 278/2013 regarding industrial emissions, Annex 6.
Three methodologies are used to determine the height of the chimney: according to the Technical Instructions for Air Quality Control – “TA Luft”, according to “Arrêté
du 25/01/91 relatif aux incinération de résidus urbains” and according to “RS 814.318.” 142.1 Ordonnance sur la l’air (Opair) “.

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