| 摘要 |
A method for pretreating desulfurized and denitrified waste water is provided to improve the quality of condensed water generated during an evaporation and condensation process, and reuse the condensed water. A waste water, which is inputted from a raw water storage tank, is primarily precipitated in a first precipitation tank(1) to remove suspended particles from the waster water and transfer supernatant to a recycle tank(2). The supernatant is inputted into a softening tank(3). Softeners, such as Na2CO3 and Ca(OH)2, are inputted into the softening tank to precipitate and remove CaSO4 and Ca(HCO3)2 contained in the waste water using CaCO3. The waste water after the softening reaction is inputted into a coagulation tank(4). A coagulant such as FeCl3 and a coagulation supplement such as polymer are inputted into the coagulation tank to coagulate suspended particles and CaCO3 precipitators remaining in the waste water. The waste water after the coagulating reaction is secondarily precipitated in a second precipitation tank(5) to minimize suspended particles in the waste water and transfer supernatant to a neutralization tank(6). An acid is inputted into the neutralization tank to neutralize the acidity of the waste water, and the neutralized waste water is transferred to a first processed water storage tank.
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