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An Ecological Assessment of the Pollution Status of the Danube River Basin in the Galati Region—Romania

Journal of Water Resource and Protection 2013年第9期5卷 876-886页

作者： Gideon A. Ajeagah Cioroi Maria praisler mirela Oana Constantin Mihaela Palela Gabriela Bahrim 1Laboratory of Hydrobiology and Environment Faculty of Science University of Yaounde 1 Yaounde Cameroon 2Faculty of Science Dunarea de Jos University of Galati Galati Romania Faculty of Science Dunarea de Jos University of Galati Galati Romania Facuty of Food Science and Engineering Dunarea de Jos University of Galati Galati Romania

Physico-chemical parameters and bio-contamination assessment through protozoan cysts and helminths eggs were carried out from the period of June to September 2010 in order to appreciate the pollution of the Danube River Basin in Romania. It recorded a higher tenor in Magnesium ion (60 mg/L) with respect to the calcium ion (20 mg/L). Other ions identified at substantial proportions were iron (1.459 mg/L), manganese (6.583 mg/L), phenol (12.780 mg/L) and Aluminium (0.0441 mg/L). Twenty one ciliated protozoa were identified in our analysis of water in the Danube River. Prominent was the presence of Caenomorpha medusula and Metopus ovatus which are indicators of polysaprobity. Resistant forms of enteropathogenic protozoa were present in our samples. These are Cryptosporidium sp (65 oocysts/l in August), Entamoeba histolytica (22 cysts/L in September), Giardia sp with 30 cysts/L in August. The helminths identified were Ascaris lumbricoides, Clornochis sinensis, Diphyllobothium latum, Enterobius vermicularis, Heterophrys heterophrys, larva of strongiloides stercoralis and Taenia sp. There is a low impact of natural depollution mechanisms which can functionally reduce the impending effect of the communicable diseases that are being transmitted by humans who constantly explore this aquatic medium during their leisure or economic activities.

关键词： Biological Pollution Danube River Basin Physico-Chemical Contamination

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Effect of Texture and Surface Chemistry of Palm Nut Hull Activated Carbon on the Adsorption of Pigments and Free Fatty Acids from Vegetable Oils

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材料科学与工程（中英文B版） 2019年第3期9卷 99-112页

作者： Jean Baptiste Bike Mbah Richard Kamga mirela praisler Dinica Rodica Department of Applied Chemistry National Advanced School of Agro-Industrial SciencesUniversity of NgaoundereP.O.Box 455NgaoundereCameroun Département of Physic Faculty of SciencesUniversitatea“Dunarea de Jos”din GalatiStr.Domneasca nr.47.800 008GalatiRomania Département of Chemistry Faculty of SciencesUniversitatea“Dunarea de Jos”din GalatiStr.Domneasca nr.47.800 008GalatiRomania

Activated carbons were produced from palm nut hull,which is a waste material of palm oil extraction *** carbons having various pore size distributions and surface composition were obtained by conventional carbonization method via the sulphuric acid solution pre-treatment *** surface areas,mesopore volume and-OH groups of activated carbons increase with the increases of sulphuric acid solution *** activated carbons obtained were tested for the adsorption of pigments and free fatty acids from palm oil and shea *** comes out from this study that the amount of adsorbate(*** and free fatty acids)fixed increases with the increase of the adsorption temperature and with the increases of mesopore *** diffusion,pseudo-first-order and pseudo-second-order kinetics models were used to analyze the kinetics data obtained at different temperatures(temperature range 60℃ to 90℃).Among the kinetics models used,the pseudo-second order was the best applicable model to describe the adsorption of oil pigments and free fatty acid onto activated *** activation energies obtained by applying the Arrhenius equation for the adsorption of pigments were low(*** than 40 kJ·mol^-1 for the both vegetables oils),indicating that the adsorption could be assigned to physisorption.

关键词： Palm nut hull activated carbon pores size distribution surface composition vegetable oil decolourisation

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