A three-dimensional electrochemical oxidation （3D-EC） reactor with introduction of activated carbon （AC） as particle micro-electrodes was apphed for the advanced treatment of secondary wastewater effluent of a wet...A three-dimensional electrochemical oxidation （3D-EC） reactor with introduction of activated carbon （AC） as particle micro-electrodes was apphed for the advanced treatment of secondary wastewater effluent of a wet-spun acrylic fiber manufacturing plant. Under the optimized conditions （current density of 500 A/m2, circulation rate of 5 mL/min, AC dosage of 50 g, and chloride concentration of 1.0 g/L）, the average removal efficiencies of chemical oxygen demand （CODer）, NH3-N, total organic carbon （TOC）, and ultraviolet absorption at 254 nm （UV2s4） of the 3D-EC reactor were 64.5%, 60.8%, 46.4%, and 64.8%, respectively; while the corresponding effluent concentrations of CODcr, NH3-N, TOC, and UV2s4 were 76.6, 20.1, and 42.5 mg/L, and 0.08 Abs/cm, respectively. The effluent concentration of CODer was less than 100 mg/L, which showed that the treated wastewater satisfied the demand of the integrated wastewater discharge standard （GB 8978-1996）. The 3D-EC process remarkably improved the treatment efficiencies with synergistic effects for CODer, NH3-N, TOC, and UV2s4 during the stable stage of 44.5%, 38.8%, 27.2%, and 10.9%, respectively, as compared with the sum of the efficiencies of a two-dimensional electrochemical oxidation （2D-EC） reactor and an AC adsorption process, which was ascribed to the numerous micro-electrodes of AC in the 3D-EC reactor. Gas chromatography mass spectrometry （GC-MS） analysis revealed that electro- chemical treatment did not generate more toxic organics, and it was proved that the increase in acute biotoxicity was caused primarily by the production of free chlorine.展开更多
利用自主改进的静电纺丝装置制备亲水性聚丙烯腈(polyacrylonitrile,PAN)与疏水性聚氯乙烯(polyvinylchloride,PVC)微纳米纤维/棉纤维包芯纱,并将其作为纬纱织造织物小样。结合扫描电子显微镜(scanning electron microscope,SEM)进行包...利用自主改进的静电纺丝装置制备亲水性聚丙烯腈(polyacrylonitrile,PAN)与疏水性聚氯乙烯(polyvinylchloride,PVC)微纳米纤维/棉纤维包芯纱,并将其作为纬纱织造织物小样。结合扫描电子显微镜(scanning electron microscope,SEM)进行包芯纱表面形貌表征与纤维直径测量,测试纱线强力,并对织物进行形貌观察以及水接触角测试与液态水分管理性能测试,以研究不同亲疏水性的微纳米纤维/棉纤维包芯纱对其织物导湿性能的影响。试验结果表明:亲水的PAN微纳米纤维/棉纤维包芯纱能够增强织物的导湿性,疏水的PVC微纳米纤维/棉纤维包芯纱对织物导湿性能的提升无积极作用;相比纯棉纱织物,PAN包芯纱/棉纱织物液态水单向传递指数提高了4级,并赋予其单向导湿性能。展开更多
基金supported by the Major Science and Technology Program for Water Pollution Control and Treatment (No. 2012ZX07201002-6)
文摘A three-dimensional electrochemical oxidation （3D-EC） reactor with introduction of activated carbon （AC） as particle micro-electrodes was apphed for the advanced treatment of secondary wastewater effluent of a wet-spun acrylic fiber manufacturing plant. Under the optimized conditions （current density of 500 A/m2, circulation rate of 5 mL/min, AC dosage of 50 g, and chloride concentration of 1.0 g/L）, the average removal efficiencies of chemical oxygen demand （CODer）, NH3-N, total organic carbon （TOC）, and ultraviolet absorption at 254 nm （UV2s4） of the 3D-EC reactor were 64.5%, 60.8%, 46.4%, and 64.8%, respectively; while the corresponding effluent concentrations of CODcr, NH3-N, TOC, and UV2s4 were 76.6, 20.1, and 42.5 mg/L, and 0.08 Abs/cm, respectively. The effluent concentration of CODer was less than 100 mg/L, which showed that the treated wastewater satisfied the demand of the integrated wastewater discharge standard （GB 8978-1996）. The 3D-EC process remarkably improved the treatment efficiencies with synergistic effects for CODer, NH3-N, TOC, and UV2s4 during the stable stage of 44.5%, 38.8%, 27.2%, and 10.9%, respectively, as compared with the sum of the efficiencies of a two-dimensional electrochemical oxidation （2D-EC） reactor and an AC adsorption process, which was ascribed to the numerous micro-electrodes of AC in the 3D-EC reactor. Gas chromatography mass spectrometry （GC-MS） analysis revealed that electro- chemical treatment did not generate more toxic organics, and it was proved that the increase in acute biotoxicity was caused primarily by the production of free chlorine.
文摘利用自主改进的静电纺丝装置制备亲水性聚丙烯腈(polyacrylonitrile,PAN)与疏水性聚氯乙烯(polyvinylchloride,PVC)微纳米纤维/棉纤维包芯纱,并将其作为纬纱织造织物小样。结合扫描电子显微镜(scanning electron microscope,SEM)进行包芯纱表面形貌表征与纤维直径测量,测试纱线强力,并对织物进行形貌观察以及水接触角测试与液态水分管理性能测试,以研究不同亲疏水性的微纳米纤维/棉纤维包芯纱对其织物导湿性能的影响。试验结果表明:亲水的PAN微纳米纤维/棉纤维包芯纱能够增强织物的导湿性,疏水的PVC微纳米纤维/棉纤维包芯纱对织物导湿性能的提升无积极作用;相比纯棉纱织物,PAN包芯纱/棉纱织物液态水单向传递指数提高了4级,并赋予其单向导湿性能。
