| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for reducing the amount of a waste liquid by concentrating a waste liquid and subjecting the concentrate to solid liquid separation to give a waste liquid of which the inorganic salt content has been lowered, and to provide a method for treating a waste liquid by subjecting a specific component contained in a recovered inorganic salt and the like to purification and the like for reutilization of the purified component. <P>SOLUTION: The method for reducing the amount of a waste liquid is characterized by concentrating a waste liquid containing an inorganic salt (for example, sodium sulfate) to give a concentrated waste liquid and separating the concentrated waste liquid into a solid component and a liquid component (for example, by centrifugation). The method for treating a waste liquid is characterized by comprising the amount reduction step in the method for reducing the amount of a waste liquid. For example, a method may be adopted in which a calcium compound is added to a liquid component containing sulfate ions to give sludge, and the sludge is dehydrated to give a dehydrate which is then reutilized as a material for cement. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
