高盐废水除氟工艺及电絮凝除氟实验的应用

Def luorination Technology of High Salt Wastewater and Application of Electric Flocculation Def luorination Test

文章分析了含氟废水的现状,阐述了高盐含氟废水产生原因及处理难度,结合高盐含氟废水的水质特征,总结了包括吸附塔吸附工艺、树脂离子交换工艺、活性炭粉煤灰吸附工艺、化学试剂沉淀工艺、电渗析工艺及电催化除氟工艺的工艺特征及各自的优缺点。结合唐山某焦化处理高盐含氟废水的实验情况,将化学沉淀法、电絮凝除氟法与焦化高盐含氟废水的处理效果作了对比。最后,通过耦合化学沉淀法及电絮凝除氟工艺,在除氟剂投加量为1‰,电絮凝电压为5.4 V,pH值为8.5的条件下,将进水的氟离子从181.0 mg/L降低至16.3 mg/L,为高盐含氟废水处理工艺探索出了一条新思路。

In this paper,the present situation of f luorine-containing wastewater is analyzed,the causes and treatment diff iculties of high-salt f luorine-containing wastewater are described,and the characteristics and advantages and disadvantages of the process including adsorption column adsorption,resin ion exchange process,activated carbon f ly ash adsorption process,chemical reagent precipitation process,electrodialysis process and electrocatalytic def luorination process are summarized in combination with the water quality characteristics of high-salt f luorine-containing wastewater.Based on the experimental results of a coking wastewater with high salt f luorine content in Tangshan,the effects of chemical precipitation and electric f locculation were compared with those of coking wastewater with high salt f luorine content.Finally,by coupling chemical precipitation method and electrof locculation def luorination process,the inf luent f luoride ion was reduced from 181.0 mg/L to 16.3 mg/L under the conditions that the dosage of def luorination agent was 1‰,the electrof locculation voltage was 5.4 V,and the pH was 8.5,and a new idea was explored for the treatment of high-salt f luorine-containing wastewater.