化学沉淀法处理酸性含氟废水研究  

TREATMENT OF ACIDIC FLUORIDE-CONTAINING WASTEWATER BY CHEMICAL SEDIMENTATION PROCESS

作　　者：高海生[1] 李瑞[1] 樊彩梅[1] 

机构地区：[1]太原理工大学化学化工学院,山西太原030024

出　　处：《水处理技术》2014年第11期107-110,114,共5页Technology of Water Treatment

摘　　要：针对某磷肥厂除氟工序中废水含氟量过高的问题,设计了"熟石灰沉淀-水循环利用"的工艺改进方案;如遇紧急情况需要对含氟废水进行外排时,则以聚合氯化铝(PAC)进行混凝深度处理;并进行了除氟实验。结果表明,含氟废水当加入理论质量1.3倍的熟石灰、反应30 min时,即可使废水中F-含量达到工厂废水循环利用要求的质量浓度30 mg/L以下;熟石灰处理后的循环水达到GB 8979-1996一级排放标准的混凝PAC最大投加量为0.6 g/L。对反应生成的沉淀物进行X射线衍射表征表明,废水中的氟是以氟化钙的沉淀形式析出。该法流程简单、处理效率高、反应时间短,系统封闭运行,几乎无废水排放。To decrease the F-content of wastewater in a phosphate fertilizer plant, the ＂slaked lime precipitate- water circulation use＂ process was designed.Poly-aluminium chloride（PAC） was used for advanced treatment of Fluoride-containing water. The results show that when the slaked lime dosage is 1.3times of theoretical mass and reaction time is 30 min, the mass concentration of F-of wastewater below 30 mg/L, which meets the requirement of factory waste water recycling. The recycled water after slaked lime treatment meets Level 1 emission standard of GB 8979-1996. The XRD result shows that the Fluoride in wastewater is separate out as calcium fluoride. Above all, this process is briefness and efficient, which has short reaction time. This system is closed to run, and nearly without wastewater discharge.

关 键 词：含氟废水 化学沉淀法 熟石灰 聚合氯化铝 

分 类 号：X703.1[环境科学与工程—环境工程]