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。     

Box-Behnken响应面法优化电絮凝工艺处理初期雨水研究

采用电絮凝工艺快速处理初期雨水,探究极板材料、电解时间、静沉时间、电极连接方式、极板间距、电流密度和极板数量等对污染物去除效果的影响,对影响程度较大的3个参数(电解时间、电流密度、极板间距),利用Box-Behnken响应面法优化最佳操作条件。结果表明,电解时间和电流密度对污染物去除效果影响呈极显著,在电解时间30 min、电流密度40 A/m²、极板间距3 cm的运行条件下,电絮凝法可有效去除初期雨水中的SS、COD和TP,SS去除率为92.46%,COD和TP去除率分别达到了85.46%和99.70%,吨水电耗为1.68 kW·h。     

电絮凝—电解耦合技术处理船舶生活污水的研究

采用电絮凝—电解耦合技术处理船舶生活污水,研究了电絮凝过程中电流密度、电絮凝时间、污水盐度、极板间距、污水初始pH等因素对船舶生活污水COD去除率的影响;进一步采用自制Ti/SnO2-Sb2O3/β-PbO2-La电极深度电解处理电絮凝后的污水,并对电解过程中的电流密度、电解时间等进行考察。结果表明:在最佳电絮凝条件下,COD去除率可达到64%;在随后的电解深度处理过程中,当电流密度为0.06 A/cm2、电解时间为180 min时,COD总去除率为93%。     

电絮凝-活性炭纤维吸附法处理电镀废水的研究

提出了以铝板作为电极板,采用电絮凝法处理含铬、镍及铜电镀废水。研究了电流密度、处理时间、电极板间距和p H等因素对铬、镍及铜离子去除效率的影响。实验结果表明,电流密度控制在5 A/dm2,极板间距为2.0~2.5 cm,电解时间控制在30 min,p H在6~9范围内,能达到较理想的去除效果。当采用电絮凝-活性炭纤维吸附法处理混合电镀废水,对废水中重金属离子的去除率达到99.97%以上。     

电絮凝法去除兰炭废水中的COD

考察了铝及不锈钢作阳极的电絮凝法去除兰炭废水COD的可行性,以及处理时间、pH、电流密度、电解质浓度、极板间距等操作条件对兰炭废水COD去除效果的影响。实验结果表明:铝阳极电絮凝去除兰炭废水COD的效果好于不锈钢阳极。用铝阳极在电流密度为0.05 A/cm2、pH=7的条件下电絮凝4 h,兰炭废水COD去除率最高可达75%。实验结果表明,铝阳极电絮凝法可实现对兰炭废水的预处理。     

超声强化三维电极/电-Fenton处理孔雀石绿印染废水

采用超声强化三维电极/电-Fenton的方法处理印染废水,以孔雀石绿为去除对象。研究了超声与三维电极/电-Fenton联用的的处理效果和影响因素,包括反应时间、p H、电解质浓度、电压、极板间距、曝气强度等。结果表明,单独超声处理孔雀石绿废水时COD去除率并不明显,色度几乎没有变化,但有新的物质产生;超声强化三维电极/电-Fenton对孔雀石绿废水的处理效果很好,比三维电极/电-Fenton对COD和色度去除率分别提高了21%和9.67%,在反应时间为120 min,p H为3、电解质Na2SO4浓度为5 g/L、电压为14 V、极板间距为9 cm、曝气强度为0.8L/min的最佳反应条件下,COD和色度去除率分别达到85.42%和99.85%。通过正交实验得出,影响因素显著性依次为:电解质浓度p H极板间距曝气强度电解电压。     

电絮凝法处理乳胶漆废水

采用电絮凝法处理乳胶漆废水,考察了初始水质、电流密度、极板间距、反应时间等因素对处理效果的影响,研究表明乳胶漆废水与生活污水体积比为1∶3、电流密度5 m A/cm2、极板间距为10 mm、反应时间6 min时,处理效果最好。对化学需氧量(COD)去除率88.06%,悬浮物(SS)的去除率99.77%,可生化性(BOD/COD)由0.02提高到0.65,满足后续生化处理的要求。     

电絮凝-气浮法处理乳化油废水实验研究

采用电絮凝-气浮法处理乳化油废水,筛选处理效果好的电极,并进行操作条件的优化实验。结果表明,铝、铁和304不锈钢电极中以铝电极为佳;优化操作条件为:电流密度12.47 m A/cm2(对应槽电压10.6 V)、电气浮时间为50 min、极板间距为1.5 cm、p H为3,在此条件下,乳化油废水的油和COD的去除率可分别达到96.01%和95.28%。可为含油废水的处理提供参考。     

利用电絮凝法深度处理二级处理生活污水出水的研究

采用双铝极板,利用电絮凝法对城市生活污水二级处理出水进行处理,以氨氮、总磷和COD的去除率等为指标,通过探索电解时间、极板间距、电流密度、pH值等参数的单因素影响分析,研究各参数对处理效果的影响,确定最佳条件。实验表明,采用双铝极板电絮凝法深度处理城市生活污水二级处理出水可有效的去除氨氮、总磷和COD。     

同轴极脉冲电絮凝法处理黄金矿业废水中Cd2+的研究

针对黄金矿业废水有毒重金属污染严重的问题,采用同轴极脉冲电絮凝法对黄金矿业废水中的Cd2+进行处理。结合能耗分析,考察了电流密度、初始p H、电解时间、搅拌速度对处理效果的影响。结果表明,对于Cd2+初始质量浓度为0.244 1 mg/L的黄金矿业废水,当电流密度为1.5 A/dm2,电解时间为25 min,初始p H为6,搅拌速度为500 r/min时,Cd2+去除率达到96.6%,能耗为17.81 k W·h/mg。同轴极脉冲电絮凝法对Cd2+有较好的去除效果。     

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。     

Electrocoagulation process for the post-treatment of anaerobically treated urban wastewater

Suitability of the electrocoagulation (EC) process for the post-treatment of anaerobically treated urban wastewater was assessed, in batch system employing real effluent from an upflow anaerobic sludge blanket (UASB) reactor. Response surface methodology (RSM) was used to optimize three important process parameters, namely current density, electrolysis time and initial pH. At the optimum conditions of pH 7.07, electrolysis time 18.0 min and current density 15.0 mA/cm², chemical oxygen demand (COD), turbidity and phosphate removal efficiencies observed were 71.0%, 98.5% and >99.9%, respectively, which were very close to the model-predicted values. High removals of suspended solids (SS; 87.5%), biochemical oxygen demand (BOD) (83.3%) and total coliforms (99.994%) were also obtained at the optimum conditions.     

电芬顿法降解苯酚废水的研究

对以空气扩散电极为阴极,铁板为阳极的电化学体系降解苯酚模拟废水进行了研究。采用分光光度法测定苯酚浓度,研究了pH值、电解时间和电流密度对苯酚去除率的影响。结果表明,电芬顿体系对含酚废水有很强的降解能力,初始浓度为300 mg/L的苯酚溶液,在电流密度20 mA/cm2条件下电解180 min,苯酚去除率99.5%,COD(Chemical Oxygen Demand)去除率85.1%。     

DSA电极催化氧化法处理制药废水的应用研究

以DSA电极为阳极、钛电极为阴极构成电解池,对抗生素废水进行了催化氧化处理。单因素实验结果表明,当槽电压7.0 V、极板间距1 cm、初始pH=5、进水初始COD 3 000 mg/L、Na Cl投加质量浓度3.0 g、电解时间30 min时,COD去除率可达到49.66%,色度去除率达85.01%。正交试验分析,当槽电压7.0 V、电解时间60 min、初始pH=5、Na Cl投加质量浓度2.5 g/L时,其电解效果最佳,可为该制药废水生化性调节起到良好的作用。     

Investigation of shipyard wastewater treatment using electrocoagulation process with Al electrodes

In this study, shipyard oily wastewater treatment was investigated by electrocoagulation (EC) using aluminum electrodes in a batch reactor by evaluating different operation conditions. The maximum chemical oxygen demand (COD) removal efficiency of 88.83% was obtained at current density of 3 mA/cm². The removal efficiency was gradually improved with increasing current density and decreased with increasing COD concentration. However, initial pH value was not determinant factor for this process. Total energy and electrode cost were calculated as $0.88 per m³ treated wastewater. The result of this research shows that EC process seems to be an efficient method for the oily wastewater treatment.     

Electrochemical removal of the insecticide imidacloprid from water on a boron-doped diamond and Ta/PbO<Subscript>2</Subscript> anodes using anodic oxidation process

The removal of pesticides from water is a major environmental concern. This study investigates the electrochemical removal of the insecticide imidacloprid (IMD) from aqueous solutions on a boron-doped diamond (BDD) and Ta/PbO₂ anodes under galvanostatic electrolysis. The influence of operating parameters, such as applied current density (50–100 mA cm^?2), initial chemical oxygen demand COD (0) (281–953 mg L^?1), temperature (25–65 °C) and pH (3.0–10.0) on COD and instantaneous current efficiency (ICE), was studied using the BDD electrode. The degradation efficiency of IMD increased by increasing current density and temperature, but noticeably decreased by the increase of initial pH value and initial concentration of IMD. The COD decay follows a pseudo-first-order kinetic, and the process was under mass transport control. COD removal reaches 90% when using an apparent current density of 100 mA cm^?2, initial COD of 953 mg L^?1, pH of 3.0 and at 25 °C after 4.5 h electrolysis time. Compared with Ta/PbO₂, BDD anode has shown better performance and rapidity in the COD removal using the same electrolysis device.     

基于开放小区道路的废水研究

针对小区开放中的废水改进,进行了电极处理废水试验。结果表明,当槽电压5 V、极板间距1.5cm、初始pH=5.5、进水初始质量浓度4 000 mg/L可以达到最佳的废水处理。进水初始质量浓度5 000 mg/L、NaCl投加量4.0 g和电解时间50 min时,COD去除率为45.66%,色度去除率为80.01%。     

Comparative study of electrocoagulation and electrochemical Fenton treatment of aqueous solution of benzoic acid (BA): Optimization of process and sludge analysis

Benzoic acid containing synthetic solution was pretreated by acid precipitation at various pH (1-3) and temperature (15-60 °C). Pre-treated solution was further treated by electrocoagulation (EC) and electrochemical Fenton (EF) processes using iron anode and graphite cathode. Optimization of independent operating parameters, namely, initial pH: (3-11), current density (A/m²): (15.24-76.21), electrolyte concentration (mol/L): (0.03-0.07) and electrolysis time (min): (15-95) for EC process and pH: (1-5), current density (A/m²): (15.24-76.21), H₂O₂ concentration (mg/L): (100-500) and electrolysis time (min): (15-95) for EF process, was performed using central composite design (CCD) in response surface methodology (RSM). Maximum removal efficiencies of BA- 76.83%, 88.50%; chemical oxygen demand (COD) - 69.23%, 82.21% and energy consumption (kWh/kg COD removed) - 30.86, 21.15 were achieved by EC and EF processes, respectively, at optimum operating conditions. It was found that EF process is more efficient than EC process based on removal of BA and COD with lower energy consumption. The sludge obtained after EC and EF treatments was analyzed by XRD, FTIR, DTA/TGA and SEM/EDX techniques.     

成对电—三维电极电解染料废水

以酸性大红3R模拟高酸高氯染料废水为研究对象,通过成对电-三维电极氧化技术,水气循环处理染料废水;实际考察了pH、NaCl质量浓度、电流密度、电解时间等对电解效果的影响,并对电解机理做了初步探讨。结果表明,水流速度3.2 L.min-1,电流密度100 mA.cm-2,经过电解8 h,废水COD去除率达80%,色度去除率95%,废水中的有机物得到了有效地降解,为工程化处理高酸高氯废水提供依据。     

TiO2膜光电催化氧化法降解印染废水的研究

采用TiO2膜电极,利用电化学和光催化协同作用对印染废水进行了降解,讨论了协同作用的机理。考察了电流密度、溶液pH值和光照强度等因素对降解率的影响。研究结果表明：光电催化氧化法的活性蓝染料溶液降解率高于电极氧化法和光催化法,证明电化学和光催化在反应过程中具有协同作用。在电流密度20 mA/cm2、pH值为4、光照距离为8 cm的条件下,降解初始浓度100 mg/L活性蓝染料模拟印染废水,2.5 h时COD去除率为88.4%,色度脱除率为93%。