| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for processing wastewater discharged from an incineration plant, which solves problems associated with an MF membrane treatment, lowers cost of equipment and provides easy operation management.SOLUTION: The method for processing wastewater discharged from an incineration plant includes: an aggregation and sedimentation step of adding a coagulant and an alkali to the wastewater to form aggregate and depositing it; a neutralization step of adding an acid to a separated water away from the aggregate deposited in the aggregation and sedimentation step, such that the separated water has a pH value in the range of 7.5 to 9.5 and has Langelier index in the range of a negative; a sand filtration step of sand filtrating the processed water in the neutralization step; a pre-filtration step of treating the filtrate obtained in the sand filtration step with active carbon and then being filtrated with a prefilter; and a reverse osmosis membrane treatment step of treating the filtrate obtained in the pre-filtration step with a reverse osmosis membrane. The membrane concentrated water obtained in the reverse osmosis membrane treatment step is supplied to a temperature decreasing device, in the method and device for processing wastewater. |
