摘要
以含钼地表水为研究对象,对比了絮凝沉淀法和离子交换法深度处理效果、动力学和药剂消耗成本。对絮凝沉淀法,当FeCl_(3)用量为0.3mol/L时,钼去除率为97.66%,残余钼浓度2.61μg/L,pH=6.56,30min钼絮凝沉淀基本达到平衡,FeCl_(3)和NaOH消耗0.52元/m^(3)。对于离子交换法,当大孔阴离子交换树脂用量为6.0g/L时,钼去除率96.41%,残余钼浓度4.017μg/L;pH=4.0吸附容量最大,为qmax=36.50μg/g,pH=8.02时q=36.02μg/g,较最大吸附容量降低1.32%;吸附符合准二级动力学模型,100min吸附基本达到平衡。以7%NaOH溶液按10∶1再生树脂,吸附—再生循环7次后,q/q0保持在96.48%~97.65%。按照12~20BV/h流速柱处理103.2~105BV溶液,树脂柱床被穿透,当处理液在160.6~162.4BV时,树脂柱床饱和。NaOH消耗5.42元/m^(3)。絮凝沉淀法在动力学和药剂成本方面优势较明显,该研究对含钼地表水深度处理和工艺设计具有指导意义。
Aiming at treatment of molybdenum contaminated surface water,treatment effect,dynamics and agent consumption of flocculation precipitation and ion exchange method were compared.As for flocculation precipitation method,when dosage of FeCl_(3) is 0.3 mol/L,molybdenum removal rate is97.66%and residual Mo concentration is 2.61μg/L,pH=6.56.Flocculation precipitation reaches equilibrium within 30min.Cost of FeCl_(3) and NaOH is 0.52RMB/m^(3).As for ion exchange method,when addition of macroporous anion exchange resin is 6.0g/L in batch adsorption,molybdenum removal rate is96.41%and residual Mo concentration is 4.017μg/L.The maximum adsorption capacity is 36.50μg/g when pH=4.0,when pH=8.02,adsorption capacity is 36.02μg/g and 1.32%lower than that of the maximum.Adsorption data fit pseudo second order equation and reaches equilibrium within 100min.Regenerated by 7%NaOH,resin used in adsorption-regeneration cycle for 7times,its q/q0keeps between 96.48%-97.65%.In column adsorption,when feed velocity is 12-20BV/h,breakthrough volume is 103.2-105BV and saturated volume is 160.6-162.4BV.Cost of NaOH is 5.42 RMB/m^(3).Flocculation precipitation method has advantage on kinetics and cost.This study has guiding significance for advanced treatment and process design of molybdenum contaminated surface water.
作者
赵可江
王俊
崔俊峰
段文杰
黄做华
黄伟庆
田振邦
ZHAO Ke-jiang;WANG Jun;CUI Jun-feng;DUAN Wen-jie;HUANG Zuo-hua;HUANG Wei-qing;TIAN Zhen-bang(Henan Academy of Sciences the Institute of Chemistry Co.,Ltd.,Zhengzhou 450002,China)
出处
《有色金属（冶炼部分）》
CAS
北大核心
2021年第6期109-114,共6页
Nonferrous Metals（Extractive Metallurgy)
基金
河南省科技重大专项(181100310100)
河南省科学院基本科研项目(200603058)
河南省科技开放合作项目(200903001)
河南省环境功能材料杰出外籍科学家工作室项目(GZS2018002)。
关键词
钼
地表水
絮凝沉淀
离子交换
动力学
再生
molybdenum
surface water
flocculation precipitation
ion exchange
dynamics
regeneration
