摘要
针对BF4-质量浓度为5 000 mg/L、F-质量浓度为6 000 mg/L的高浓度PAO生产废水,研究钾盐沉淀—铝盐水解—石灰沉淀的水处理工艺。试验结果表明,在室温、pH=2.0、总钾盐质量分数5%、KCl与KAl(SO4)2.12H2O质量比为5∶1的条件下,钾盐沉淀可使BF4-质量浓度降低到300 mg/L;在30℃、pH=2.0、铝盐质量分数3%、AlCl3.6H2O与Al2(SO4)3.18H2O质量比为3∶2的条件下,水解后BF4-质量浓度降低为8 mg/L;石灰沉淀时Ca(OH)2与F-物质的量比为2.5∶1。处理后废水中的F-和BF4-的质量浓度均降低为10 mg/L以下,F-质量浓度达到《污水综合排放标准》(GB 8978—1996)的一级排放标准。
For the wastewater from the PAO plant containing 5 000 mg/L fluoride and 6 000 mg/L fluoroborate iron,the treatment process which composed of kalium salt precipitation-aluminate hydrolysis-lime precipitation has been studied.The results show that under the following conditions：at room temperature,pH=2.0,the total kalium salt mass fraction is 5%,m（KCl）∶m（KAl（SO4）2·12H2O） is 5∶1,the kalium precipitation can make the mass concentration of BF4-decrease to 300 mg/L.Under another condition：at 30 ℃,pH=2.0,aluminate mass fraction is 3% and m（AlCl3·6H2O）∶m（Al2（SO4）3·18H2O）is 3∶2,after the BF4-is hydrolyzed,its mass concentration is decreased to 8 mg/L.Under further conditions：when lime precipitation is conducted,n（Ca（OH）2）∶n（F-）is 2.5∶1,after the treatment,the mass concentrations of F-and BF4-in wastewater are both decreased to less than 10 mg/L, and the mass concentration of fluoride can reach the first class of the Integrated Wastewater Discharge Standard（GB 8978—1996）.
出处
《工业水处理》
CAS
CSCD
北大核心
2011年第6期62-65,共4页
Industrial Water Treatment
关键词
PAO
含氟废水
氟硼酸根
化学沉淀
水解
poly-α-olefin lubricant
fluoride-containing wastewater
fluoroborate
chemical precipitation
hydrolysis
