The paper presents an ecotoxicological study upon some food additives used worldwide. A brief assessment of the use of food additives, the advantages and disadvantages of their introduction into technological processes and their biological effects has been carried out. Chemical analyzes were realized in some food sauces for representatives of the group of food dyes and the group of antioxidants, namely tartrazine and the sodium salt of ethylene diamino-tetra acetic acid (EDTA). The results showed the presence of the two additives in the studied products from the Romanian market, whether declared or not. Finally, the results obtained were discussed both from the perspective of the need and the toxicity of the studied food additives.

The purpose of the paper is to reveal the development of plants grown both traditionally and environmentally friendly and to achieve a comparison of advantages and disadvantages of the two systems of agriculture. An essential aspect on which there is an emphasis with a view to the practical application of the organic farming system is the soil fertilization, given the fact that most of the problems that have made the necessity to convert to this type of agriculture are a consequence of soil  damage and affecting its quality. The researches have been performed on five species of plants grown in two systems of agriculture. The results obtained have a high theoretical and practical importance and reveal the importance of the organic farming within the framework of the activities of the environmental protection, even if the level of productivity is further reduced.

Both surface and underground water sources represent national treasures that need to be managed according to the sustainable use principle in order to maintain their quality properties. If the surface water pollution is obvious from sources chemical residues, the even some pollutants such as atmospheric emissions, waste waters, underground waters are not free from pollution, diffuse to depths of tens or hundreds meters. Unfortunately the countryside as well as the urban area, is affected by pollution as there are areas where the wells water is the only water source available for the population.

The raw water treatment using coagulant and ultrasound indicates a faster decrease of turbidity. The main water indicators - pH dynamics and dissolved oxygen content are also presented and discussed. The dose of aluminum sulphate, actually the most widely used coagulant, decreases 8 times at the use of ultrasound waves, which represents an economy of chemicals for the water plants.

The paper aimed to demonstrate that the sludge from wastewater treatment plants can be used efficiently as a fertilizer in horticulture because in the near future the storage of this sludge will become a problem. For this reason, we approached the study on the recovery of the sludge from the wastewater treatment plant of Brăila as fertilizer in the crops of ornamental garden plants that are not intended for consumption. The correct management of the sludge from wastewater treatment plants may bring a positive contribution to the vegetation development rate. The main objective of the sludge treatment is the capitalization and the decrease of negative impact on the environment.