CDI-EDI組合工藝處理含鹽重金屬廢水的研究
發(fā)布時間：2018-08-03 20:57
【摘要】：近年來,隨著人們風(fēng)險意識的提升,含鹽重金屬廢水的零排放技術(shù)受到了矚目,但在含鹽重金屬廢水中,由于鹽離子的吸附競爭和增溶效應(yīng),使得重金屬離子的去除難度明顯提高。本論文結(jié)合了電容去離子技術(shù)(CDI)與電去離子技術(shù)(EDI),以自制的CDI-EDI反應(yīng)裝置處理含銅模擬廢水和含鎳(Ni)電鍍廢水,考察了反應(yīng)裝置的去離子機理和效果,并對陽室的離子交換和電遷移作用,陰室的電容電極吸附作用去除重金屬離子分別進行了考察。通過三電極體系正交實驗,對2.0 cm×2.0 cm的電極材料進行了選擇,篩選出比表面積大、比電容高、性能穩(wěn)定且易制備的Ti/CAC電容電極,循環(huán)伏安最佳掃速為5.0 mV/s,掃描電壓為-0.30~0.30 V。當(dāng)電解質(zhì)為1.0 mol/L Na2SO4溶液,恒電流50.0 mA,電壓限為0.20 V時,Ti/CAC電極的充電和放電比容量分別約為138.7 F/g和139.5 F/g。采用自制的CDI-EDI裝置處理含鹽重金屬廢水,用5.0 cm×10.0 cm的Ti/CAC電容電極作為電極,分別對陽室、陰室和濃室的去離子作用進行了研究。陽離子交換樹脂是陽室去除重金屬離子的主要作用,當(dāng)陰、陽室分別填裝5.0 mL陰、陽離子樹脂時,不加電處理50.0 mg/L Cu2+,陽離子交換作用可達到68.3%的去除率。外加9.0 mA電流可較好地再生樹脂,且樹脂再生后對Cu2+的去除效果穩(wěn)定。對于陽室電遷移作用,當(dāng)處理235 mg/L Cu2+溶液,濃室進水為0.20 mol/L Na2SO4溶液時,采用4.0 mA的電流可避免電解水反應(yīng),去除陽室溶液中的Cu2+效果較好,且出水穩(wěn)定。此外,發(fā)現(xiàn)延長吸附時間或增加吸附串聯(lián)裝置數(shù)量可以提高陰極對重金屬離子的吸附效率。采用CDI-EDI裝置,將陽室離子交換和電遷移,以及陰室電吸附作用組合應(yīng)用,模擬廢水中的Cu2+去除率明顯提高。當(dāng)陰、陽室分別填裝樹脂12.0 mL,處理50.0 mg/L Cu2+溶液,外加2.0 mA電流時,處理22.5 min后,陽室和陰室出水的Cu2+去除率分別達到96.4%和87.4%。對于含Ni2+389.4 mg/L的實際電鍍廢水,經(jīng)過強化沉淀-微濾處理后,采用CDI-EDI組合工藝進一步處理,陽室和陰室出水Ni2+的平均濃度分別降為1.61 mg/L和2.01 mg/L。CDI-EDI裝置運行耗能低,效率高;樹脂在線再生,再生液和濃縮液可循環(huán)使用,達到重金屬和鹽的富集目的,且無二次污染,為含鹽重金屬工業(yè)廢水的處理提供了新的技術(shù)和數(shù)據(jù)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.
【學(xué)位授予單位】：河北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：X703
本文編號：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.
【學(xué)位授予單位】：河北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：X703
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