Volume-15 ~ Issue-6 ~ June 2022

Abstract: La ville de Niamey s'est dotée dernièrement d'une nouvelle station de traitement des boues de vidange (BV) par lits de séchage non plantés : une technique basée sur la sédimentation, l'évaporation et l'infiltration. Les boues dépotées à la station sont essentiellement issues des fosses septiques et des fosses toutes eaux. L'objectif du présent travail est d'étudier le rendement épuratoire de cette station. A cet effet, un échantillonnage des BV brutes et du percolât a été réalisé au niveau de chaque unité de traitement, suivi des analyses physico-chimiques et bactériologiques d'une part et d'autre part, un suivi morphologie des plantes a été évaluer........

Keywords: rendement épuratoire, boues de vidange, STBV, Niamey.

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Abstract: For this paper, the dried, milled and particle size classified aluminum hydroxide samples were collected from the new unit, designed to produce different grades of dried and milled aluminum hydroxide with specific particle size distribution at Alum SA Tulcea, Romania. The research program included the selection of several samples based on particle size and particle size distribution, namely, fractions 0-10, 0-20, 0-45 and 45-150 microns, and the normal Bayer product 0-150 microns as blank sample. The thermal treatments of these samples consist in their heating up at a rate of 5ºC/minute at 260°C, 300°C and respectively, 400°C, followed by a 3 hours more heating at each final temperature........

Keywords: Calcined aluminas, crystallinity, density, brightness, water adsorption capacity, oil adsorption capacity, particle size dimensions.

[1]. Dobra G, Iliev S, Cotet L, Boiangiu A, Hulka I, Kim L, Catrina GA, Filipescu L, Heavy metals as impurities in the Bayer production cycle of the aluminum hydroxide from Sierra Leone Bauxite. Preliminary study, J. Sib. Fed. Univ. Engineering and Technologies, 2021, 14(.2):151-165.
[2]. Dobra G, Garcia-Granda S, Iliev S, Cotet L, Hulka I, Negrea P, Duteanu N, Boiangiu A, Filipescu L, Aluminum hydroxide impurities occlusions and contamination sources, Rev. Chim, 2020. 71(9):65–76.
[3]. Dobra G, Iliev S, Anghelovici N, Cotet L, Filipescu L, Impurities Accumulation on the Surface of Alumina Hydrate Particles in Bayer Technology, Rev. Chim. 2019,70(2): 355-360.
[4]. Dobra G, Kiselev A, Filipescu L,. Alistarh V, Anghelovici N, Iliev S, Full analysis of Sierra Leone bauxite and possibilities of bauxite residue filtration, J. Sib. Fed. Univ. Engeering and. Technology, 2016, 9(5):643-656.
[5]. Meshcheryakov EP, Reshetnikov SI, Sandu MP, Knyazev AS, Kurzina IA,. Efficient Adsorbent-Desiccant Based on Aluminium Oxide, Appl. Sci. 2021, 11(6), 2457.

Abstract: The study focused on profiles of heavy metals in Cow Milk compared with corresponding values of different researchers in Nigeria and other countries. Fresh Cow Milk samples (obtained from a herder settlement outside Okada town, Benin City, Edo State in Nigeria) were carefully collected from lactating cows digested and subjected to heavy metal analysis using atomic absorption spectroscopy. All the metals (Fe, Pb, Cu, Cd, Co, Mn, Zn and Ni) assessed were found to be present in all the samples. The analyzed metal profiles are as follows: concentration of Fe, Cu Zn Pb Cd, Co, Ni and Mn ranged from 0.586 to 0.652, 0.287 to 0.384, 0.129 to 0.232, 0.022 to 0.036, 0.005 to 0.019, 0.046 to 0.082, 0.070 to 0.086, 0.073 to 0.087 mg/l respectfully. Iron, lead, nickel and cadmium contents in this study did exceed the tolerance limits of WHO/SON Standards, giving rise for concern of the consumption of fresh milk (obtained from this area) and its uses to produce related consumable products..

Keywords: Heavy metals, Fresh cow's milk, atomic absorption spectroscopy

[1]. Abdalla M O M, Hassabo A A and Elsheikh N A H (2013): Assessment of some heavy metals in waste water and milk of animals grazed around sugar cane plants in Sudan. Livestock Research for Rural Development. Volume 25, Article #212. Retrieved September 3, 2021, from http://www.lrrd.org/lrrd25/12/abda25212.htm
[2]. Ahmad Ijaz, Aqal Zaman, Noreen Samad, Muhammad Mazhar Ayaz, Shah Rukh, Atif Akbar, and Najeeb Ullah (2017): Atomic Absorption Spectrophotometery Detection of Heavy Metals in Milk of Camel, Cattle, Buffalo and Goat from Various Areas of Khyber- Pakhtunkhwa (KPK), Pakistan; Journal of Analytical & Bioanalytical Techniques 2017, 8:3 DOI: 10.4172/2155-9872.1000367
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Abstract: Here in we discussed the biogenic synthesis of palladium (Pd) nanomaterials from plants and microbes because it is cost-effective, sustainable, and environmentally friendly. Plants and their parts are known to contain a variety of primary and secondary metabolites that convert metal salts to metal nanoparticles. The pH, temperature, incubation time, and concentrations of plant extract and metal salt all have an effect on the shape, size, and stability of Pd nanoparticles. Pd nanoparticles are widely used in catalysis, drug delivery, and cancer treatment. They have demonstrated size and shape-dependent specificity and selectivity in therapeutic properties. We discussed the biogenic fabrication of Pd nanoparticles, their potential applications as catalysts, medicine, and biosensors in this review

Key words: Biogenic synthesis, herbal extract, phytochemicals, metal nanoparticles, cancer treatment

[1]. Zengsheng Han, Le Dong, Jin Zhang, Tianming Cui, Shengfu Chen, Guanglong Ma, Xiaolei Guo and Longgang Wang "Green synthesis of palladium nanoparticles using lentinan for catalytic activity and biological applications" https://doi.org/10.1039/C9RA08051A(2019)
[2]. Aruna Jyothi Kora and LoriRastogi" Green synthesis of palladium nanoparticles using gum ghatti (Anogeissus latifolia) and its application as an antioxidant and catalyst" https://doi.org/10.1016/j.arabjc.2015.06.024(2018)
[3]. Azizi S, Mahdavi Shahri M , Rahman HS , Rahim RA, Rasedee A, Mohamad R "Green synthesis palladium nanoparticles mediated by white tea (Camellia sinensis) extract with antioxidant, antibacterial, and antiproliferative activities toward the human leukemia (MOLT-4) cell line" DOI https://doi.org/10.2147/IJN.S149371(2017).
[4]. Kadam. J, Madiwale. S, Bashte. B, Dindorkar. S, Dhawal. P. & More. P." Green mediated synthesis of palladium nanoparticles using aqueous leaf extract of Gymnema sylvestre for catalytic reduction of Cr (VI)" SN AppliedSciences volume 2, Article number: 1854 (2020) [5]. Sadaf Lebaschi , Malak Hekmati , Hojat Veisi "Green synthesis of palladium nanoparticles mediated by black tea leaves (Camellia sinensis) extract: Catalytic activity in the reduction of 4-nitrophenol and Suzuki-Miyaura coupling reaction under ligand-free conditions" DOI: 10.1016/j.jcis.2016.09.027(2017)

Abstract: Background: Beaches are key points for recreation and coastal tourism and a major source of income for many countries. Thus, good beaches attract tourists and degraded ones discourage tourism. Also, beaches and coastal areas are ecosystem areas and vital for the conservation of natural resources. The research goal in this paper was to analyze the concentration of heavy metals on the tourist beaches of the city of Puerto Plata (Dominican Republic) and its impact on the conservation of coastal marine systems and the development of recreational activities and tourism.........

Key words: heavy metal, pollution, beach, tourism.

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