Abstract:

Aiming at the problems of conventional treatment of fluorine-containing wastewater in color television kinescope factory,an experiment on the enhanced coagulation treatment by sludge recirculation is carried out.The experimental results in lab and full-scale running showthat the sludge recirculation has enhanced the coagulation of fluorine-containing wastewater and got a good treatment effect.The fluoride of effluent water can be controled at a level of below 10.5 mg/L,and the fluoride in discharged water of the color television kinescope factory is stabilized at 4—6 mg/L.Compared with the conventional treatment process,the enhanced coagulation process do not need to dose calcium chloride,and it reduces the lime dosage 40%,reduces half sludge production,saves the coagulant 75%—80%,and increases the sedimentation efficiency 50%.The treatment cost reduces from2.75 yuan/m³ to 1.35 yuan/m³ and gets a considerable economic benefits.

Key words: fluorine-containing wastewater, ferric chloride, enhanced coagulation, sludge recirculation

摘要：

针对彩管厂含氟废水常规处理工艺存在的问题,提出了合理的污泥回流强化混凝处理工艺,并在实验室小试研究和实际生产运行中取得了很好的处理效果,出水F-质量浓度控制在10.5 mg/L以下,工厂混合后的排放水F-质量浓度基本稳定在4—6 mg/L。同时,省去了氯化钙投药系统,石灰用量比原来减少40%,产污泥量减至原来的一半,混凝剂用量减至原来的1/5—1/4,沉淀效率比原来提高50%,处理成本则由2.75元/m³降至1.35元/m³,取得了显著的经济效益。

关键词: 含氟废水, 三氯化铁, 强化混凝, 污泥回流

CLC Number: 

• X703.1