SummaryShipping represents a significant source of diesel emissions, which affects global climate, air quality and human health. As a solution to this problem, biodiesel could be used as marine fuel, which could help in reducing the negative impact of shipping on environment and achieve lower carbon intensity in the sector. In Southern Europe, some oily wastes, such as wastes from olive oil production and used frying oils could be utilized for production of the second-generation biodiesel. The present research investigates the influence of the secondgeneration biodiesel on the characteristics of gaseous emissions of NOx, SO2, and CO from marine diesel engines. The marine diesel engine that was used, installed aboard a ship, was a reversible low-speed two-stroke engine, without any after-treatment devices installed or engine control technology for reducing pollutant emission. Tests were carried out on three regimes of engine speeds, 150 rpm, 180 rpm and 210 rpm under heavy propeller condition, while the ship was berthed in the harbor. The engine was fueled by diesel fuel and blends containing 7% and 20% v/v of three types of second-generation biodiesel made of olive husk oil, waste frying sunflower oil, and waste frying palm oil. A base-catalyzed transesterification was implemented for biodiesel production. According to the results, there are trends of NOx, SO2, and CO emission reduction when using blended fuels. Biodiesel made of olive husk oil showed better gaseous emission performances than biodiesel made from waste frying oils.

The aim of this study was to investigate the physicochemical properties of peloid, its mineralogical composition and its antimicrobial activity, including the presence of algae, with the aim of considering its dermo-cosmetic application, such as anti-skin aging and treatment. Physicochemical analysis showed that peloid from Ulcinj coast, contains minerals, necessary for smooth performance of skin functions, as well as, the whole body. A studied peloid sample showed significant antimicrobial activity of Candida albicans strain, and the presence of algae of Bacillariophyta division, known to have a beneficial effect on skin health. Results of examination of peloid from Ulcinj locality, recommended it as a high quality natural substance applicative in dermo-cosmetic preparations for treatment of problematic skin.

UVODMineralno blato -peloid koristi se od davnina, a podaci o njegovom korišćenju su pronađeni na papirusima pisanim prije 4000 godina koji pokazuju da su Egipćani koristili peloid kod opekotina, ginekoloških bolesti i problema sa zglobovima (1). Peloid nastaje dugogodišnjim taloženjem prirodnih elemenata i veoma je djelotvoran kod reumatskih i dermatoloških oboljenja.ljekovito blato -peloid sa lokaliteta ulcinja, nalazi se na bazenima Solane, na dubini od jedan i po metar ispod površine, u sloju čija debljina iznosi i do 10 m, sa srednjom debljinom oko 3,5 m. ulcinj je sa svojim prirodnim resursima -sumporna mineralna voda, ljekovito mineralno blato, pijesak, prirodna morska so, matične lužine i drugo poznat od davnina (2). naučnik Mihajlo Pupin je još 1910. godine pisao o zdravstvenim mogućnostima ulcinja i tražio koncesiju za izgradnju sanatorijuma, a kralj aleksandar Karađorđević je proglasio ulcinj prirodnim liječilištem. Peloid postoji i na mnogim drugim lokacijama na zemlji, a jedna od najpoznatijih je region Mrtvog mora u izraelu; njegovu hemijsku analizu je uradio još lavoazije 1772. godine (3, 4). uprkos velikoj primjeni mineralnog blata -peloida u dermatologiji i kozmetičkim preparatima, još uvijek postoje nejasnoće u vezi sa njegovom hemijskom strukturom, prirodnom mikrobiološkom florom i njegovim uticajem na mikroorganizme. ovaj prikaz karakteristika mineralnog blata iz ulcinjske solane ima za cilj da pomogne boljem razumijevanju osobina peloida sa ove lokacije i doprinese većoj upotrebi ovog nesumnjivo vrlo kvalitetnog prirodnog resursa.

As a carbon neutral fuel, biodiesel is one option in future IMO scenarios for reducing carbon intensity in shipping sector, and at same time reducing emission of pollutants. Some oily wastes, such as waste from olive oil production, might be used for production of second-generation biodiesel. The current study looks into the effect of biodiesel on the characteristics of gaseous pollutant emissions of NOx and CO from slow-speed two-stroke marine diesel engines that do not have any after-treatment devices or engine control technology installed to reduce gaseous pollutant emissions. While the ship was berthed in the harbor, tests were performed on two separate loads at 210 rpm. The engine was powered by diesel fuel and blends of 7%, 20%, and 25% v/v of biodiesel derived from oily wastes generated during olive oil processing. For biodiesel production in lab conditions, base-catalyzed transesterification was implemented. According to the findings, there are tendencies of reduced gaseous emissions when utilizing blended fuels.