THERMOCHEMICAL CONVERSION TECHNOLOGIES FOR PRODUCING BIOFUELS FROM AGRICULTURAL BIOMASS

Biomass generated as residue from various agricultural activities is a renewable resource for producing energy, being available in abundant quantities and having low negative impact on environment quality. Biomass can be converted to biofuel using different thermal, biological and physical processes, however these technologies are not yet fully developed, to be able to successfully replace the classic sources of energy production. In this paper, will be assessed the main technologies for converting biomass into biofuels, exploring the physical and chemical characteristics of energy potential from agricultural biomass sources

THE CHEMICAL COMPOSITION OF SOME SORGHUM GENOTIPES FOR GRAINS CULTIVATED IN THE CENTER OF MOLDOVA

In the lab, three sorghum hybrids for grains cultivated in the Center of Moldova were analyzed qualitatively, two of them having white grains, and one having red grains. Two of the hybrids, one with white grains (Albanus) and one with red grains (Alize) came from Euralis SAS France, and the third, with white grains, came from N.A.R.D.I. Fundulea Romania (Fundulea 32). The results obtained from the laboratory investigations indicated that the variation of the chemical composition of the sorghum grain depending on the cultivated hybrid

THE CHEMICAL COMPOSITION OF SOME SORGHUM GENOTIPES FOR GRAINS CULTIVATED IN THE CENTER OF MOLDOVA

In the lab, three sorghum hybrids for grains cultivated in the Center of Moldova were analyzed qualitatively, two of them having white grains, and one having red grains. Two of the hybrids, one with white grains (Albanus) and one with red grains (Alize) came from Euralis SAS France, and the third, with white grains, came from N.A.R.D.I. Fundulea Romania (Fundulea 32). The results obtained from the laboratory investigations indicated that the variation of the chemical composition of the sorghum grain depending on the cultivated hybrid

Obtained results regarding the optimization of grain sorghum technology in pedoclimatic conditions from Central of Moldova

In recent decades in Romania and in many other regions of the world, there is a high frequency of drought years, to three years out of every five. This climate negatively affects the productivity of agricultural crops, and agricultural research must find solutions to diversify the assortment of crops that in tougher environmental conditions guarantee the stability and profitability of agriculture. One of the safest solutions is the cultivation of sorghum, whether for grain or biomass, which due to good drought resistance, the ability to withstand high temperatures and capitalize on poorly fertile land is superior by the yields of all crops and especially, cereals and fodder plants. In the pedoclimatic conditions from the Center of Moldova, starting with 2018 year, were initiated some researches regarding the optimization of the cultivation technology for grain sorghum, in order to create a technology in relation to the new climatic conditions and in relation to the protection of the environment. The results obtained on average over two agricultural years, 2018 and 2019, indicated a very large variation of grain production depending on the sowing density provided and on the applied mineral fertilizers, this being between 4074 kg/ha and 10234 kg/ha. The best results were obtained in the variants sown with 30 g.g./sqm and fertilized with N150P80 with and without the application of the biostimulator Aminosol. From the point of view of economic efficiency, the variant sown with 30 g.g./sqm and fertilized with N150P80 was the most profitable

Experimental Water Treatment Plant from Agrozootechnical Farm

According to the existing statistical data at the country level, over 65% of the wastewater (rural from agricultural livestock farms) is discharged without purification, 61% are insufficiently purified and only 10-15% are properly purified. The pollution effect of wastewater not purified or insufficiently purified on surface waters, is mainly manifested by the content of suspended matter, of organic matter, in nutritional salts, ammonium and in pathogenic microorganisms. It is well-known that the nutritional salts of nitrogen and phosphorus cause the eutrophication of surface waters, with the effect of consuming the dissolved oxygen needed to sustain the aquatic life. Ammonia is particularly toxic to aquatic life. Unsaturated or insufficiently purified wastewater pollutes groundwater, among others with nitrates, ammonium and bacteriologically. From the presented results, the purification of waste water is an essential requirement of the development of human civilization. Being a necessity with special social and ecological implications, the unitary regulation and the general provision of the necessary infrastructure is a priority, in this sense an article will be presented in an experimental treatment station that performs the collection of waste water from an agrozootechnical farm. The purification of water within this experimental model of treatment plant will be done autonomously from an energy point of view (electricity supply is carried out through a hybrid system based on photovoltaic panels and wind turbine), and the recovery. The use of purified water is done in a greenhouse, using a mixed irrigation system (dripping / spray irrigation)

Dimensional characteristics of grist intermediate products obtained in the first two technological passages in the reduction phase of an industrial milling plant

After the wheat is coarsely grinded in the breakage technological phase and after a certain percentage of flour and bran has been extracted here, the crushing is continued in the reduction technological phase. The paper presents the flow of grist products at the first two technological passages from the reduction phase of an industrial milling unit. Samples taken from these two technological passages were subjected to a granulometric analysis, and with the experimental data a nonlinear correlation was performed with the Rosin-Rammler law, obtaining correlation coefficients of over 0.954. The paper also discusses the limits of the dimensions between which the particles of each fraction are sorted at the first two technological passages in the reduction phase. The analysis performed in this paper can serve in establishing the fabrics of the sifting frames from the plansifter compartments, respectively when adjusting the roller mills