| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method and system for wastewater treatment, capable of efficiently removing various components in an original wastewater in the treatment using a reverse osmosis membrane, and capable of effectively utilizing the cleaning waste liquid of the reverse osmosis membrane. <P>SOLUTION: An original wastewater 1 is subjected to alkali aggregation and precipitation in an alkali aggregation/precipitation tank 12, and the generated precipitate 4 is separated. The water 3 treated by alkali aggregation and precipitation is treated by a reverse osmosis membrane treatment unit 14 to obtain a permeated water 7. The reverse osmosis membrane provided to the treatment unit 14 is cleaned by an alkaline chemical liquid 6, and a cleaning waste liquid 9 generated at that time is returned to the alkali aggregation/precipitation tank 12 or an original wastewater storage tank 11 in the previous stage thereof. <P>COPYRIGHT: (C)2013,JPO&INPIT |
