CDI-EDI组合工艺处理含盐重金属废水的研究
发布时间：2018-08-03 20:57
【摘要】：近年来,随着人们风险意识的提升,含盐重金属废水的零排放技术受到了瞩目,但在含盐重金属废水中,由于盐离子的吸附竞争和增溶效应,使得重金属离子的去除难度明显提高。本论文结合了电容去离子技术(CDI)与电去离子技术(EDI),以自制的CDI-EDI反应装置处理含铜模拟废水和含镍(Ni)电镀废水,考察了反应装置的去离子机理和效果,并对阳室的离子交换和电迁移作用,阴室的电容电极吸附作用去除重金属离子分别进行了考察。通过三电极体系正交实验,对2.0 cm×2.0 cm的电极材料进行了选择,筛选出比表面积大、比电容高、性能稳定且易制备的Ti/CAC电容电极,循环伏安最佳扫速为5.0 mV/s,扫描电压为-0.30~0.30 V。当电解质为1.0 mol/L Na2SO4溶液,恒电流50.0 mA,电压限为0.20 V时,Ti/CAC电极的充电和放电比容量分别约为138.7 F/g和139.5 F/g。采用自制的CDI-EDI装置处理含盐重金属废水,用5.0 cm×10.0 cm的Ti/CAC电容电极作为电极,分别对阳室、阴室和浓室的去离子作用进行了研究。阳离子交换树脂是阳室去除重金属离子的主要作用,当阴、阳室分别填装5.0 mL阴、阳离子树脂时,不加电处理50.0 mg/L Cu2+,阳离子交换作用可达到68.3%的去除率。外加9.0 mA电流可较好地再生树脂,且树脂再生后对Cu2+的去除效果稳定。对于阳室电迁移作用,当处理235 mg/L Cu2+溶液,浓室进水为0.20 mol/L Na2SO4溶液时,采用4.0 mA的电流可避免电解水反应,去除阳室溶液中的Cu2+效果较好,且出水稳定。此外,发现延长吸附时间或增加吸附串联装置数量可以提高阴极对重金属离子的吸附效率。采用CDI-EDI装置,将阳室离子交换和电迁移,以及阴室电吸附作用组合应用,模拟废水中的Cu2+去除率明显提高。当阴、阳室分别填装树脂12.0 mL,处理50.0 mg/L Cu2+溶液,外加2.0 mA电流时,处理22.5 min后,阳室和阴室出水的Cu2+去除率分别达到96.4%和87.4%。对于含Ni2+389.4 mg/L的实际电镀废水,经过强化沉淀-微滤处理后,采用CDI-EDI组合工艺进一步处理,阳室和阴室出水Ni2+的平均浓度分别降为1.61 mg/L和2.01 mg/L。CDI-EDI装置运行耗能低,效率高;树脂在线再生,再生液和浓缩液可循环使用,达到重金属和盐的富集目的,且无二次污染,为含盐重金属工业废水的处理提供了新的技术和数据支持。
[Abstract]:In recent years, with the improvement of people's risk consciousness, the zero discharge technology of heavy metal wastewater containing salt has attracted much attention. However, in the wastewater containing salt heavy metals, the adsorption competition and solubilization effect of salt ions are the main reasons. The removal of heavy metal ions is obviously more difficult. In this paper, (CDI) and (EDI), are combined to treat the copper containing simulated wastewater and nickel containing (Ni) electroplating wastewater with a self-made CDI-EDI reactor. The mechanism and effect of the device are investigated. The ion exchange and electromigration in anion chamber and the adsorption of capacitive electrode in anion chamber to remove heavy metal ions were investigated. The electrode materials of 2.0 cm 脳 2.0 cm were selected by orthogonal experiment of three-electrode system. The Ti/CAC capacitive electrodes with large specific surface area, high specific capacitance, stable performance and easy preparation were selected. The optimal sweep speed of cyclic voltammetry was 5.0 MV / s, and the scanning voltage was -0.30 ~ 0.30 V / s. When the electrolyte is 1.0 mol/L Na2SO4 solution, the constant current is 50.0 Ma, and the voltage limit is 0.20 V, the specific charge and discharge capacities of the Ti- / CAC electrode are about 138.7 F / g and 139.5 F / g, respectively. A self-made CDI-EDI device was used to treat the wastewater containing heavy metals containing salt. The deionization of anion chamber, anion chamber and concentrated chamber was studied by using the Ti/CAC capacitor electrode of 5.0 cm 脳 10.0 cm as the electrode. Cationic exchange resin is the main action of removing heavy metal ions in anion chamber. When the anion and cationic resin are filled with 5.0 mL anion respectively, the removal rate of cationic exchange can reach 68.3% without adding electricity for 50.0 mg/L Cu2. The resin can be regenerated well by adding 9.0 Ma current, and the removal effect of Cu2 is stable after the resin is regenerated. For the electromigration of the positive chamber, the electrolytic water reaction can be avoided by using the current of 4.0 Ma when the concentration chamber influent is 0.20 mol/L Na2SO4 solution, and the removal of Cu2 in the positive chamber solution is better, and the effluent is stable. In addition, it is found that the adsorption efficiency of heavy metal ions can be improved by prolonging the adsorption time or increasing the number of adsorption series devices. The removal rate of Cu2 in simulated wastewater was obviously improved by using the combination of ion exchange and electromigration in anion chamber and electrosorption in anion chamber with CDI-EDI device. When the resin was filled with 12.0 mL of resin and the solution of 50.0 mg/L Cu2 was treated with 2.0 Ma current, after 22.5 min treatment, the removal rate of Cu2 in the effluent of the positive chamber and the negative chamber reached 96.4% and 87.4%, respectively. For the actual electroplating wastewater containing Ni2 389.4 mg/L, after enhanced precipitation-microfiltration treatment, the average concentration of Ni2 in effluent of positive chamber and cathode chamber was reduced to 1. 61 mg/L and 2. 01 mg/L.CDI-EDI, respectively, and the average concentration of Ni2 was reduced to 1. 61 mg/L and 2. 01 mg/L.CDI-EDI, respectively, and the operation energy consumption was low and the efficiency was high. The resin can be regenerated on line, the regenerated liquid and concentrate can be recycled to achieve the purpose of heavy metal and salt enrichment, and there is no secondary pollution, which provides new technology and data support for the treatment of heavy metal industrial wastewater containing salt.
【学位授予单位】：河北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X703
本文编号：2162978
[Abstract]:In recent years, with the improvement of people's risk consciousness, the zero discharge technology of heavy metal wastewater containing salt has attracted much attention. However, in the wastewater containing salt heavy metals, the adsorption competition and solubilization effect of salt ions are the main reasons. The removal of heavy metal ions is obviously more difficult. In this paper, (CDI) and (EDI), are combined to treat the copper containing simulated wastewater and nickel containing (Ni) electroplating wastewater with a self-made CDI-EDI reactor. The mechanism and effect of the device are investigated. The ion exchange and electromigration in anion chamber and the adsorption of capacitive electrode in anion chamber to remove heavy metal ions were investigated. The electrode materials of 2.0 cm 脳 2.0 cm were selected by orthogonal experiment of three-electrode system. The Ti/CAC capacitive electrodes with large specific surface area, high specific capacitance, stable performance and easy preparation were selected. The optimal sweep speed of cyclic voltammetry was 5.0 MV / s, and the scanning voltage was -0.30 ~ 0.30 V / s. When the electrolyte is 1.0 mol/L Na2SO4 solution, the constant current is 50.0 Ma, and the voltage limit is 0.20 V, the specific charge and discharge capacities of the Ti- / CAC electrode are about 138.7 F / g and 139.5 F / g, respectively. A self-made CDI-EDI device was used to treat the wastewater containing heavy metals containing salt. The deionization of anion chamber, anion chamber and concentrated chamber was studied by using the Ti/CAC capacitor electrode of 5.0 cm 脳 10.0 cm as the electrode. Cationic exchange resin is the main action of removing heavy metal ions in anion chamber. When the anion and cationic resin are filled with 5.0 mL anion respectively, the removal rate of cationic exchange can reach 68.3% without adding electricity for 50.0 mg/L Cu2. The resin can be regenerated well by adding 9.0 Ma current, and the removal effect of Cu2 is stable after the resin is regenerated. For the electromigration of the positive chamber, the electrolytic water reaction can be avoided by using the current of 4.0 Ma when the concentration chamber influent is 0.20 mol/L Na2SO4 solution, and the removal of Cu2 in the positive chamber solution is better, and the effluent is stable. In addition, it is found that the adsorption efficiency of heavy metal ions can be improved by prolonging the adsorption time or increasing the number of adsorption series devices. The removal rate of Cu2 in simulated wastewater was obviously improved by using the combination of ion exchange and electromigration in anion chamber and electrosorption in anion chamber with CDI-EDI device. When the resin was filled with 12.0 mL of resin and the solution of 50.0 mg/L Cu2 was treated with 2.0 Ma current, after 22.5 min treatment, the removal rate of Cu2 in the effluent of the positive chamber and the negative chamber reached 96.4% and 87.4%, respectively. For the actual electroplating wastewater containing Ni2 389.4 mg/L, after enhanced precipitation-microfiltration treatment, the average concentration of Ni2 in effluent of positive chamber and cathode chamber was reduced to 1. 61 mg/L and 2. 01 mg/L.CDI-EDI, respectively, and the average concentration of Ni2 was reduced to 1. 61 mg/L and 2. 01 mg/L.CDI-EDI, respectively, and the operation energy consumption was low and the efficiency was high. The resin can be regenerated on line, the regenerated liquid and concentrate can be recycled to achieve the purpose of heavy metal and salt enrichment, and there is no secondary pollution, which provides new technology and data support for the treatment of heavy metal industrial wastewater containing salt.
【学位授予单位】：河北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X703
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