电解氧化法去除染料废水的色度

对染料废水进行电解氧化法处理,探讨电极间距、电流密度、H_2O_2用量、反应时间对染料废水色度去除率的影响。结果表明,在电极间距1 cm、电流密度12 mA/cm~2、H_2O_2用量0.3%、反应时间30 min的工艺条件下,色度2160度的1 500 mL染料废水经处理,剩余色度为68.2度,色度去除率达96.84%,满足印染行业间接排放要求。     

微电解-铁碳内电解耦合预处理高浓度染料废水

以实际废水为研究对象,采用微电解-铁碳内电解联合工艺法处理高浓度、高色度和高含盐量高的染料废水,考察了固/液比、铁/碳比、电流密度等因素对色度和化学需氧量（COD）的去除率的影响。结果表明,当反应时间为30 h、固液比（体积比）为1∶20、铁碳比（体积比）为1∶1、电流密度为9.26 mA/cm2时,该组合工艺处理印染废水效果稳定,平均出水色度值为1000 倍,COD去除率达到56.5%。综合处理效果与经济两方面因素,电解-内电解耦合工艺是预处理高浓度燃料废水的有效方法之一。     

基于形稳阳极-不锈钢阴极-电Fenton处理染料废水的研究

采用钌铱镀层钛电极为阳极,不锈钢为阴极,电Fenton法处理实际染料废水,采用单因子分析方法考察电极材料、电解时间、电流密度、极板间距、p H值、硫酸亚铁投加量、曝气量和搅拌速度等参数对染料废水COD去除率的影响。当电解时间为2 h,电流密度为1.2 A/mm2,极板间距为2.5 cm,p H值为2.5,硫酸亚铁投加量为0.5 g/L,曝气量为2 L/min,搅拌速度为1000 r/min,COD去除率达到47.84%。对电流密度、极板间距、p H值、硫酸亚铁投加量设计正交实验,极板间距、p H和硫酸亚铁投加量对电Fenton体系去除率的影响显著,电流密度对去除率影响不显著。     

电絮凝椰壳活性炭吸附耦合技术处理亚甲基蓝废水的研究

染料废水主要来自印染加工的各道工序,具有水量大、浓度高、色度深的特点。针对染料废水难以自然降解的问题,采用电絮凝与活性炭吸附耦合技术处理亚甲基蓝废水。先后探讨了电极板组合、反应时间、电流密度、极板间距、椰壳活性炭投加量对废水处理效果的影响。结果表明在电解时间60 min,电流密度350 mA/cm²,极板间距3.0 cm,活性炭投加量2 g/L时,亚甲基蓝废水去除率可达98.74%。     

三维电极技术催化氧化含氯羟丙基胍胶模拟废水

采用活性炭三维电极系统处理含氯羟丙基胍胶(HPG)模拟废水,考察了Cl-质量浓度、电流密度、电解时间、溶液pH、粒子电极填充率对COD去除效果的影响。结果表明,在电解时间为60 min,电流密度为7 mA/cm2,Cl-质量浓度为5 600 mg/L,粒子电极填充率为85%,溶液pH为2的最佳条件下,废水的COD去除率可达68.15%。处理过程中,Cl-电解生成强氧化性的活性氯参与HPG的氧化降解反应,导致其断链生成多种氧化产物的中间体(包括氯化有机物),同时显著提高废水的处理效果。     

电絮凝处理模拟铬黑T染料废水

电絮凝(EC)具有成本低、操作简单、无需添加药剂、污泥少以及无二次污染等优点。采用电絮凝技术处理模拟铬黑T(EBT)染料废水，研究了不同电解质及其浓度、电流密度、初始pH以及溶液初始浓度对染料废水的脱色率和化学需氧量(COD)去除率的影响。结果表明，该技术对染料废水的色度和COD的去除均有良好的去除效果，在纯Al板为电极，染料废水浓度为100 mg/L，极板间距为15 mm,NaCl浓度为0.75 g/L，电流密度为10 mA/cm²，溶液初始pH为6的实验条件下，电解20 min，脱色率可达97.5%,COD去除率为61.3%。电絮凝过程中不仅可以产生有较强吸附作用的絮体，还可以产生能够破坏染料分子中发色基团的强氧化性物质，从而降低废水的色度和COD含量。因此，电絮凝技术在染料废水的处理方面有一定的应用前景。     

铁炭微电解联合O/A/O生物工艺处理化工废水

研究铁炭微电解预处理与复合生物工艺对某一利用制药与染料工艺废水生产大苏打厂排放的高杂混合化工废水的处理效果.铁炭微电解预处理可提高该废水的可生化性,降低COD和色度,并能有效去除硫化物.该预处理对硫化物的去除率高达99%.经历40d的驯化启动阶段,后续复合生物反应器开始正常运行.后续生物处理可使出水COD维持在700 mg/L,总COD去除率80%～86%.这些结果为应用铁炭微电解与O/A/O复合生物工艺治理高杂混合化工废水提供一定的参考.     

电絮凝气浮法处理分散艳蓝E-4R废水的研究

采用电絮凝气浮法处理分散艳蓝E-4R染料废水,考察了电解时间、废水初始浓度、pH值及外加电解质氯化钠和絮凝剂等不同反应条件对废水处理效果的影响。结果表明,染料废水脱色率随着电解时间的加大而逐渐增大并随初始浓度的增大而慢慢降低;pH值在2.5~10范围内电解均可获得较高的脱色率。初始浓度为400 mg/L的染料废水,电解20 min后脱色率即达87.39%,但TOC去除率只有10.49%。投加50 mg/L氯化钠后,脱色率和TOC去除率分别达到93.61%和73.49%,TOC去除率提高60%以上。在电解的条件下投加不同絮凝剂能提高染料废水的处理效果,其处理效果从大到小依次为:硫酸铝>三氯化铝>硫酸亚铁,它们的适宜用量分别为50,100,100 mg/L。     

Fe/C微电解法处理甲基紫染料废水

利用Fe/C固定床反应器,对Fe/C微电解法处理甲基紫染料废水的反应进行了研究。考察了进水pH值、进水流量、微电解反应柱中的Fe/C体积比、反应时间对处理效果的影响。结果表明,Fe/C微电解法可较好地处理甲基紫染料废水,甲基紫染料去除率高,脱色率好,最佳工艺条件为:进水pH值3.19,水流量为0.16 mL/s,微电解反应柱中的Fe/C体积比为1∶2,反应时间为3.5 h,甲基紫的去除率可达98.2%。     

电絮凝-超滤集成技术处理洗浴废水

采用电絮凝-超滤集成技术处理洗浴废水,实验研究了电极材料、电流密度、电解时间和电导率等因素对电解洗浴废水COD、浊度去除率的影响,并确定了超滤膜的清洗周期和清洗方法.结果表明,电解工艺中Al电极较Fe电极具有更好的处理效果,电絮凝-超滤集成技术对洗浴废水的COD和浊度的去除率分别为85%和95%以上,超滤透过液达到了生活杂用水标准.超滤膜清洗周期为12天,采用化学清洗和水力冲洗相结合的清洗方法可使超滤膜的通量恢复.     

超重力-电催化耦合法降解含酚废水

将自制的超重力多级同心圆筒电解装置应用于电催化降解含酚废水的过程中, 解决电化学法处理废水存在"气泡效应"和"传质受限"导致的废水处理效率降低的难题。考察了超重力因子、电流密度、电解时间、电解质浓度、液体循环流量、苯酚初始浓度对废水降解效果的影响, 确定了超重力-电催化耦合法处理含酚废水的最佳工艺条件。结果表明:超重力因子为30、电流密度为200A/m²、电解质浓度为3g/L、液体循环流量为80L/h、电解时间为7h时, 处理初始浓度100mg/L的含酚废水, 苯酚去除率可达99.1%, COD去除率可达24.7%。超重力电催化法强化了离子传质过程, 实现了废水中苯酚的高效去除, 为含酚废水的处理研究探索了一种新途径。     

电化学方法处理酸性艳兰6B染料废水的研究

采用钛网作为阳极,钛网为阴极,对酸性艳兰6B模拟染料废水进行了实验研究,探讨了电解时间、电解质浓度、电流密度以及进水浓度对酸性艳兰6B脱色效率的影响。结果表明:增加电流密度,提高电解质浓度,延长反应时间有利于酸性艳兰6B色度的脱除,对于含有100 mg/L的酸性艳兰6B溶液,电解质NaCl的质量浓度为20.0 g/L,电流密度为2.5 A/dm2,电解时间25 min,溶液的脱色率达到93.75%。     

Hypochlorite production on Ru-Sn binary oxide electrode and its application in treatment of dye wastewater

Ruthenium-tin binary oxides [(Ru+Sn)O₂] were coated on titanium substrates by thermal decomposition. The surface morphologies and elemental analyses of these electrodes were examined by means of scanning electron microscopy. The electrochemical behaviours were characterized by cyclic voltammetry and linear-scan voltammetry (LSV) methods. The effects of electrolysis condition for the current efficiency (CE) of hypochlorite production on binary (Ru+Sn)O₂ electrodes and the treatment of a high salt-containing dye wastewater using this hypochlorite were also investigated. The highest CE for hypochlorite production exists on an RS3 (40 to 80 mol% Sn in coating solution) electrode. The major factors influencing CE for hypochlorite production are the electrolyte flow rate, current density, and chloride (Cl-) concentration. Major factors affecting energy yield are current density, Cl- concentration, and electrode distance. For low current density (300 mA.cm^?2), high Cl- concentration (1 mol.L^?1), and 0.45 cm electrode separation, a high specific energy is obtained. The RS3 electrode exhibits the best removal of organics and chromophor groups in the dye wastewater. On this electrode, better removal of organics and chromophor groups is obtained at 300 mA.cm^?2. The colour of black-red dye wastewater becomes light yellow when a charge of 792 A·min was passed, while the chemical oxygen demand (COD) of this wastewater is decreased from 10500 mg.L^?1 to 1250 mg.L^?1.     

在不分隔的反应器中原位电生成活性氯氧化降解蒽醌染料

The purpose of this paper was to investigate the possibility of treating C. I. Reactive Blue 19 wastewater by electrochemical oxidation via electrogenerated active chlorine, using metallic oxide coatings （dimensional stable anode, DSA） as anode. The electrolysis for the simulated wastewater was conducted at a constant current. Absorbances at 592 nm and 255 nm were measured to follow the decolorization of the dye and the degradatin of its aromatic ring. After 4 h of electrolysis under the experimental conditions： current density of 15 A·m^-2, 0.2 mol·L^-1 NaCl, 0.1 mol·L^-1 Na2SO4, 0.1 mmol·L^-1 dye, initial pH=6.4 and T=30℃, 100% decolorization of the dye and about 45% degradation of its aromatic ring were achieved, while no obvious change of total organic carbon was observed. The experimental results suggest that the decolorization of the dye and degradation of its aromatic ring were directly affected by current density, temperature, concentrations of the dye and sodium chloride, while slightly affected by initial pH and sodium sulfate concentration; the decolorization of the dye and degradation of its aromatic ring followed pseudo-first-order kinetics; and indirect electrooxidation, using electrogenerated active chlorine, predominated in the electrochemical oxidation.     

In situ hypochlorous acid generation for the treatment of textile wastewater

An electrolytic process based on chlorine generation was adopted to treat wastewater containing textile dyes. In situ production of hypochlorous acid was achieved in an undivided electrolytic cell. The cell contained a graphite rod as the anode and a stainless steel sheet as the cathode. The generated chlorine reacts with water leading to the formation of hypochlorous acid and hydrochloric acid. The resultant hypochlorous acid, being an oxidising agent, oxidises the organic components present in the textile wastewater. In this study, the colour in wastewater containing Procion Navy and Procion Red dyes, respectively, was completely removed after 40 min of electrolysis at a constant current density of 39 mA/cm² (where the initial dye concentrations were 3700 and 3200 mg/l, respectively). In the case of the Procion Yellow and composite dyes, complete colour removal occurred after 50 min of electrolysis (with initial dye concentrations of 3500 mg/l). Even though colour removal occurred during the electrolysis process, it required up to 180 min of electrolysis to reduce the COD values for the four dyes (Procion Navy, Red, Yellow and the composite) from the initial levels of 4520, 4200, 4170 and 4283 mg/l to 70, 45, 39 and 52 mg/l, respectively. This clearly indicates that the process removes both colour and organic components present in textile wastewater.     

Treatment of textile dye wastewater by using an electrochemical bipolar disc stack reactor

Textile dye house wastewater from a reactive dye processing unit was treated by using an electrochemical oxidation technique. The experiments were carried out in an electrochemical bipolar disc reactor using RuO₂ coated on titanium as anode and titanium as cathode. The sodium chloride present in the effluent was used as supporting electrolyte. Operating parameters such as current density, reservoir hold‐up and electrolysis time were studied for maximum Chemical Oxygen Demand (COD) reduction and other relevant parameters such as current efficiency and power consumption per kg of COD removal were calculated. The higher flow rate and lower reservoir hold‐up resulted in improved COD removal. The applied current density was also found to significantly influence the reduction of COD. A suitable mathematical model is also proposed to illustrate the relationship between the basic parameters. Pseudo mass transfer coefficients were also evaluated for different experimental conditions. Copyright © 2004 Society of Chemical Industry     

电生成强氧化剂处理染料废水试验研究

本文研究了用电化学方法生成的强氧化剂H2O2和HClO处理酸性铬兰K染料废水。在电解过程中向阴极表面通纯氧，氧在阴极上还原可生成H2O2，以NaCl作为电解质，Cl-在阳极上还原为Cl2，Cl2进一步转化为HClO，H2O2和HClO都是强氧化剂，都可氧化降解染料分子。电解废水30．0min，褪色率和CODcr去除率分别为90．5％和76．7％，电解废水50．0min，褪色率和CODcr去除率分别为100．0％和83．1％。     

活性黑5染料模拟废水电解脱色探究

为明确活性黑5染料在电化学体系中的脱色过程,以石墨为阴极,Ti/PbO_2为阳极,考察了电流大小、初始pH值、电解质种类及浓度、电解时间、温度、染料初始浓度对染料脱色过程的影响。结果表明:电流大小、氯化钠浓度对活性黑5脱色率影响较大,一定条件下染料脱色率可达99%;初始pH对染料脱色率几乎无影响,随着初始pH在4~10范围内变化,脱色率始终稳定在99%以上;染料的脱色率随着电解时间的增加而增大,当电解时间达到60 min时,染料脱色率达到99%。     

多维电极法处理活性染料废水影响因子正交实验分析

以活性嫩黄K-4G染料模拟废水为处理对象(CODCr=4000mg／L，色度=13000，pH=6.5)采用多维电极法．选择了6个影响脱色率和CODCr降解率的因素，每个因素3个水平进行正交试验。实验结果表明：电解时间、电流密度和电导率对脱色率和CODCr降解率影响最大。最优水平组合为A3B3C3D1E1F3，在此条件下脱色率为81%，CODCr降解率为85％。