火力发电厂烟气脱硫废水处理工艺

WASTEWATER TREATMENT PROCESS OF FLUE GAS DESULFURIZATION IN THE POWER PLANT

石灰石-石膏湿法脱硫所产废水,由于水质较为特殊,不能直接排入电厂工业废水处理系统,需设置单独的处理装置。采用物化法对脱硫废水进行处理,经过中和、沉淀、混凝以及污泥脱水等步骤,脱硫废水主要水质指标均显著降低,出水水质达到污水综合排放标准GB8978-1996的二级新建排放标准的要求。实际运行表明,该处理工艺处理脱硫废水有效,运行稳定,运行费用较低,效益显著。但该工艺Cl-脱除能力有效,有待进一步研究。

Since the comparatively peculiar water quality, the wastewater of the Limestone/Gypsum flue gas dsulfurization （FGD） system can not drain directly into the industrial wastewater treatment plant system in the power plant. It needs to set up the separate plant to treat the waste water of FGD. The physico-chemical wastewater treatment of the FGD system includes neutralization, precipitation, flocculation and sludge dewatering, etc. After treatment, the concentration of main water quality target reduces obviously; the water quality conforms to the emissions requirement. The practical operation shows that the process is efficient,stable and lower costs in operation, it has significant economic benefits. However, this process has a limited ability of Cl^- removal, need to be studied further.