钎剂工业废水处理工艺优化试验研究

摘要

钎剂工业生产废水含有表面活性剂以及氢氟酸等物质,可生化性较差,传统沉淀+蒸发方式处理钎剂废水效果较差.试验研究粉末活性炭吸附+光催化工艺处理钎剂工业废水,首先通过投加氢氧化钙中和氢氟酸,再经粉末活性炭(PAC)以及光催化吸附降解表面活性剂.结果显示,当氢氧化钙投加摩尔比(Ca2+/F-)为7～8、PAC与COD质量比为3时,光催化条件为紫外光强容积负荷0.012 W/cm3、催化剂TiO2投加量30 mg/L、H2 O2投加量4.5 gH2O2/gCOD时,经光催化2.5 h后,即可以达到氟化物浓度小于20 mg/L及COD小于100mg/L的排放要求.%Flux wastewater contains surfactant and hydrofluoric acid (HF),resulting in low biodegradability and poor treatment performance by the traditional precipitation and evaporation method.Experimental study of the powder activated carbon adsorption+photocatalysis process for flux wastewater treatment was carried out.In this process,the HF was neutralized by adding calcium hydroxide Ca(OH)2,and the surfactant was removed by powdered activated carbon (PAC) adsorption and photocatalytic degradation.The results showed that the effluent quality could meet the discharge permits of fluoride concentration below 20 mg/L and COD below 100 mg/L after photocatalytic treatment for 2.5 hours under thefollowing conditions:Ca (OH)2 dosage at reaching Ca2+/F-molar ratio of 7～8;PAC to COD mass ratio at 3;UV light intensity at 0.012 W/cm3;catalyst (TiO2) dosage at 30 mg/L;and H2O2 dosage at 4.5 gH2O2/gCOD.