Abstract
In recent year, environmental degradation is concerned. The "sustainable development" has become important issue in Japan, because natural disaster triggered nuclear plant accident and environmental pollution is raised. Therefore, future petroleum crisis is feared. In manufacturing, machining fluid (metal working fluid: cutting oil, grinding fluid) is used for performance increasing. It contains oil, surface active agent, extreme pressure agent (CI, S, P etc.), anti foam agent, preservative agent, biocide etc.. It is concerned that several chemicals causes worker's health hazard while machining. Moreover, it is necessary that waste fluid treatment (incineration or coagulative precipitation etc.) is performed. Huge environmental load (CO_2 emission etc.) and disposal cost is necessary. Then, decreased or non-using of machining fluid is demanded in industry. Then, in this investigation, the electric rust preventive machining method system that uses only water as machining fluid, is proposed and developed. In part of this, water recycle system that enables to re-use water is developed. This water recycle system removes sludge, chip, fine particle, rust and ion, bacteria and pollutant (cesium etc.) etc. from used water. In addition, iodine (pollutant) reduction is evaluated. Contaminated water iodine (0.055mg/L) is decreased to less than O.OO1mg/L. Water purification performance is clarified. And, purified refined water quantity is achieved over 1OL/min. Furthermore, in order to more safety, water recycle system is installed ultraviolet radiation unit for sterilization of bacteria without biocide using.
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