酸性含氟废水处理回用工程实例
Engineering cases for the treatment and reuse of acidic fluorine-containing wastewater
某氢氟酸及制冷剂生产企业废水处理系统工艺流程为:调节池(曝气)→加药反应→絮凝→沉淀→脱硫塔(烟气脱硫)→加药反应→絮凝沉降。先用铝酸钙粉替代传统的石灰乳对含氟废水进行处理,再将处理后的高pH废水直接用于烟气脱硫,既节约了后续调节废水pH用的酸,又节约了烟气脱硫所用的碱,可以做到以废治废,实现了废水、废气达标排放。目前该系统已稳定运行3 a,处理后的废水、废气均能达到《无机化学工业污染物排放标准》(GB 31573—2015)直接排放限值要求。
The process flow of the wastewater treatment system of a specific hydrofluoric acid and refrigerant production enterprise is as follows:regulating tank (aeration)→dosing reaction→flocculation→sedimentation→desulfurization tower (flue gas desulfurization)→dosing reaction→flocculation sedimentation.Initially,calcium aluminate powder is employed to substitute the traditional lime milk for the treatment of fluoride-containing wastewater.Subsequently,the treated wastewater with a high pH value is directly utilized for flue gas desulfurization.This approach not only saves the acid required for the subsequent pH adjustment of the wastewater but also the alkali used for flue gas desulfurization.It can achieve the goal of treating waste by waste and realize the standard-compliant discharge of wastewater and waste gas.Currently,the system has been operating stably for three years.Both the treated wastewater and waste gas can meet the direct discharge limit requirements stipulated in the “Emission Standard of Pollutants for Inorganic Chemical Industry”(GB 31573—2015).
含氟废水 / 絮凝沉降 / 烟气脱硫 / 脱硫废水 / 以废治废
fluorine-containing wastewater / flocculation sedimentation / flue gas desulfurization / flue gas desulfurization wastewater / waste treatment by waste
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