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This paper presents a study of the wastewater treatment station of the ?Low Danube", in which were analyzed the variations of physico-chemical parameters of the influent and effluent, as well as the efficiency of the treatment processes. The requirements on the quality of the effluent are in accordance with Council Directive 91/271/EEC on wastewater treatment, which aims is to prevent the negative effects of discharges of urban waste water and waste water from certain industrial activities. The parameters analyzed...

Biological domestic water treatment is an important and integral step of wastewater treatment system and it treats wastewater coming from either residential buildings or industries. This process is used to remove any contaminants that left over after primary treatment. The biological process of domestic water treatment presented in this paper consisted in the activation of the suspended microorganisms, which consisted of two distinct operations: a) aeration, where the microorganisms are mixed with nutrients from d...

The risk assessment of an organization is stipulated in international standards and in a variety of international and national laws and reglementations. In the context of the obvious environmental problems and incidents with disastrous effects for the environment of the past 50 years, industrial and business environment recognizes the importance of environmental risk management and its applied. In the process of the environmental risk management, the risk assessment and risk treatment plays a crucial role in the c...

On global scale the nickel coa tings obtaining is realised with electrolytes that have the toxically composition that working at the temperature range 40 - 800C. In this paper was proposed an ecological solution to obtaining the nickel layers and composite coatings with nickel matrix and silicon. The energy consume is reduced be cause the working is passed on ambient temperature. The addition of silicon particles into nickel plating bath leads to significantly changes for the surface morphology and for the roughne...