TREATMENT OF TECHNOLOGICAL WATER FOR THE AEROSPACE INDUSTRY – OPERATING PROBLEMS

The paper presents the water treatment technology for FPI line (Fluorescent Penetrant Inspection) which is used to conduct diagnostic tests in the field of structural cracks, erosion, corrosion, defects of the material, welds cohesion. The problem that occurred during operation of the FPI line was an increase of turbidity and milky colour of water (i.e. white water) in bathtub of the last rinse which caused the formation of deposits on washed parts and hampered diagnostic process. On the basis of the physicochemical and bacteriological analysis the assessment of changes in water quality during the cleaning process was carried out. The problem of the formation of the so-called "white water" was described and solved. An analysis of necessity of water treatment station modernization as well as the legitimacy of the use of the disinfection process were made. The following parameters of water were analysed: pH, turbidity, conductivity, hardness, dissolved oxygen, total organic carbon, permanganate index, SiO₂ content, heavy metals contents, and the total number of mesophilic and psychrophilic bacteria. The results of the analyses indicate that the cause of the growth of technological water turbidity on the FPI, is formation of polysilicon acid. Polymerized forms of silicates exist in colloidal form, therefore, the observed phenomenon is the emergence of so-called "white water" and the formation of deposits.

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