The industrial development, the demographic growth and the limitation of the natural regions have determined a continuous degradation of the water quality due to high concentrations and complexity of pollutants from the wastewater. The centralized and decentralized treatment systems apply treatment procedures and techniques which can be complementary in solving the environmental pollution problems due to wastewater. In the present paper a three-dimensional mathematical model was elaborated based on the experimental data obtained in a wastewater treatment plant with sequential operation, correlating the treatment degree with independent variables such as the temperature of the wastewater and the treatment duration, respectively. The mathematical model was developed and verified by using a specialized software, Table Curve 3D .The model was based on experimental data obtained by using a low capacity treatment plant, with a sequential operation, in a Sequencing Batch Reactor (SBR) type and the real domestic wastewater.

The sludge treatment processes represent a priority when we refer to the municipal wastewater treatment, but can implicate very complex studies and applications if we consider the industrial wastewater recovery and treatment processes. Even if the industrial sludges are seen as wastes, they can represent an important resource if are properly managed in the storage, treatment and recovery processes. This paper aims to identify some methods to optimize the coagulation and flocculation process used in petroleum slurry treatment. The application was carried out in real conditions of operation, aiming to establish the optimal concentrations for the chemical compounds used: the dispersant Drimax 1235, coagulant Magnafloc LT 32 and flocculant Magnafloc 120 L. The optimal concentration was established by analyzing the efficiency of the liquid and solid phase separation.

Cadastral methods must be as fast and accurate as possible. A method of cadastre is reference to the use the aircraft. Because during a flight can occur diverse external factors that can change the normal flight conditions, can influence respectively pictures from by the camera, it is necessary that it be mounted on a stabilizing platform. Such a platform was designed and built by S.C. Aerostar S.A. Bacau in collaboration with "VasileAlecsandri" University of Bacau. This platform, on three axes, permit the achievement the movements to compensate of the axis system of the aircraft, respectively have been combined two stabilized platforms: a simple one, for motion compensation on an axis (gyration) and a compound one, for compensating movement on the other two axes (the roll and pitch motions ). The correction of deviation is performed by the power supply and control units, while the information regarding the aircraft's deviation is provided by the inertial measurement unit.