电絮凝-生物吸附法处理电镀废水的研究

以发酵工业常用的酵母菌为生物吸附剂,利用电絮凝和微生物联合处理混合电镀废水。探讨了电絮凝工艺在废水高浓度区及低浓度区的去除率,并通过实际的生产运行论证了工艺的适用性。采用电絮凝-微生物联合工艺处理混合电镀废水,对废水中重金属离子的去除率达到99.98%以上。     

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。     

一种处理含重金属离子电镀废水的新工艺

为了解决含重金属离子电镀废水的处理问题,研究了电絮凝-膜法复合工艺处理含Ni^2＋、Cr^a＋等重金属离子印钞制版电镀废水,并与化学还原沉淀法进行了比较。结果表明,化学还原沉淀法无法同时兼顾对Ni^2＋、Cr^a＋的去除率,而电絮凝-膜法复合工艺对Ni^2＋、Cr^a＋的去除率可达到99％以上,全面实现了全天候稳定达到《电镀污染物排放标准》GB21900-2008排放标准。     

蛭石絮凝剂一级强化絮凝预处理皮革废水的研究

针对悬浮颗粒物多、有机污染物浓度高的皮革废水，使用生态型无生物毒性的蛭石絮凝剂，进行一级强化絮凝预处理，结合阳离子助凝剂C-PAM，并且参考传统无机絮凝剂PAC，分别调查蛭石絮凝剂对皮革废水的絮凝效果、C-PAM的协同效应以及与PAC相比之下的絮凝沉降速度。由实验结果可知，蛭石絮凝剂对皮革废水具有很好的絮凝效果，在最佳投加量为6.0 g/L时，上清液的COD、SS、浊度、TP和NH₃-N的去除率分别为62.1%、94.5%、97.9%、88.6%和19.3%；在此基础上，阳离子C-PAM为12 mg/L最佳投加量下，上清液的COD、SS、浊度要比只有蛭石絮凝剂的去除率再度增加34.3%、52.4%和54.7%，总去除率分别达到75.1%、97.6%和98.9%，对TP和NH₃-N无机物离子去除的影响很小；絮凝后上清液中的重金属和硫化物仍然满足国家排放标准，不因絮凝而超标。相比于PAC，蛭石絮凝剂具有更好的絮凝和沉降效果，在C-PAC协同下，蛭石絮凝剂2 min就基本完成沉降，而PAC却刚刚开始，即使15min后，蛭石絮凝剂的沉积物体积也只有P...     

电絮凝法处理电镀废水的研究进展

随着电镀行业的快速发展,如何对电镀废水进行高效处理是需要解决的问题。电镀废水是主要的重金属污染源,废水中含有大量的铬、镍及铜等金属离子,对环境和人类健康造成很大的危害。简述了电絮凝法的基本原理,概述了电絮凝法在电镀废水治理方面的研究进展,综述了废水处理过程中影响因素及作用机理的研究进展,最后指出了电絮凝法的发展方向及需要进一步解决的问题。     

常规絮凝工艺与加载絮凝工艺处理锌、铜废水的研究

以含锌废水和含铜废水为研究对象,在常规絮凝工艺和加载絮凝工艺中,对其处理含锌废水和含铜废水时pH的影响、混凝剂投加量的影响、以及助凝剂投加量的影响进行对比研究。结果表明,在其各自的最佳工况下,加载絮凝工艺比常规絮凝工艺对pH变化适应性更强,投药量更少,重金属去除效果更好,出水总锌、总铜、浊度分别稳定在1 mg/L、0.1 mg/L、0.5 NTU以下,远低于《广东省水污染物排放限制标准》（DB4426-2001）一级排放标准。     

絮凝-氧化处理含硫废水

本实验采用絮凝和氧化相结合方法处理含硫废水。研究了絮凝剂的用量、絮凝时pH值及氧化时pH值对处理效果的影响。处理后的废水中硫离子去除率为99.73%,其浓度为0.635mg/L,低于国家一级排放标准(1.0mg/L)。     

磁絮凝去除工业废水中铜离子的试验研究

采用磁絮凝对工业废水中重金属铜离子进行试验研究,讨论了聚合硫酸铁(PFS)投加量、静沉时间、温度、pH值、磁粉投加量对处理效果的影响.试验结果表明PFS投加量为100mg/L,pH值为8.0,静沉时间为20min,磁粉投加量为400mg/L时对含铜废水有良好的处理效果,铜离子去除率超过了97%,出水铜离子的质量浓度低于...     

催化氧化-絮凝沉淀处理橡胶助剂废水工程实例

针对橡胶助剂废水的特点,利用催化氧化-絮凝沉淀工艺对废水进行处理。工程运行结果显示,催化氧化-絮凝沉淀工艺对橡胶助剂废水具有较好的处理效果。该工艺对COD的总去除率达92.6%,苯胺类的总去除率达98.6%。污水处理站出水能够满足《污水综合排放标准》（GB8978-1996）二级标准要求。     

氧化絮凝床治理电脑生产废水

本文采用自行研制的氧化絮凝复合床（OFR）对电脑废水进行了处理，探讨了催化剂种类、槽电压、极距、空气流量及絮凝剂对处理效果的影响。实验表明：在最佳条件下，电脑废水的COD去除率高达92.12%，经絮凝处理后水的水质优于国家一级排放标准。     

电絮凝技术在水处理中的应用

电絮凝是一种环境友好型技术。电絮凝方法占地面积小,不需要添加化学试剂,污泥量少,操作简单,可以有效去除水中的COD、重金属、色度、氟化物和有毒有害物质。本文介绍了电絮凝处理水的基本原理,综述了电絮凝在水处理中的应用及存在的不足,提供了解决方法。针对能耗较高的问题,可从改进电源、研制新电极和与其他技术连用等方面研究。     

电絮凝处理海水中污染物的研究

采用铁电极和铝电极对电絮凝处理受污染海水过程中浊度和化学需氧量(COD)去除效率进行了研究,试验结果表明:电絮凝处理海水工艺对浊度具有一定的去除效果,其去除率可达85%以上,铝电极的处理效果要好于铁电极。对电絮凝处理海水过程中COD的去除效率进行了试验研究,试验中发现电絮凝处理海水过程中剩余COD值与电流密度呈二级反应关系,并拟合出相应的动力学方程。     

Arsenic Removal from Industrial Effluent through Electrocoagulation

In the present investigation, it is attempted to remove arsenic from smelter industrial wastewater through electrocoagulation. Experiments covering a wide range of operating conditions for removal of the arsenic present in the smelter wastewater are carried out in a batch electrochemical reactor. Mild Steel and Stainless Steel plates have been used as the anode and cathode respectively. It has been observed from the present work that arsenic can be removed effectively through electrocoagulation.     

电絮凝处理含铜电镀废水的研究

通过实验研究了电絮凝处理含铜电镀废水的效果,分别考察了电解时间、电流密度、污染物初始浓度以及pH值的影响,结果表明,pH在中性时,电絮凝对Cu的去除效果好;电流密度增大,污染物去除效果也增大,4 A/dm2的污染物去除效果最好,电解Cu只需10 min就能达到理想的去除效果。初始浓度越大,所需要的通电量越大。     

Coagulation and Electrocoagulation of Wastes Polluted with Colloids

Abstract

The goal of this work has been to compare for both, continuous and batch processes, the efficiencies of the chemical and the electrochemical coagulation processes with hydrolyzing aluminum salts, and to determine the similarities or differences that exist between both coagulation processes. To meet the objective, experiments of both coagulation technologies have been carried out in the same operation conditions and the results have been interpreted in terms of the mechanisms previously proposed in literature for kaolin coagulation. The charge neutralization by the adsorption of monomeric hydroxocations onto the kaolin surface can be the primary coagulation‐mechanism for low concentration of aluminum and acidic pHs (below 4). In the range of pH 4–7, two primary mechanisms can explain the experimental behavior of the system: sweep flocculation for high concentration of aluminum, and a combination of precipitation‐charge‐neutralization and charge neutralization by adsorption of monomeric or polymeric aluminum, for low concentration of aluminum. In the continuously‐operated processes, the efficiency in the turbidity‐removal seems to be much related to the aluminum species present in the treated waste, and not to the way of adding aluminum to the reaction system. For the same steady‐state pH and aluminum concentration, the same turbidity removal is obtained in both, the chemical and the electrochemical coagulation processes. For high aluminum/kaolin ratios, kaolin suspensions which contain sulfate as electrolyte, achieve better removals of turbidity than those containing chloride ions. The operation mode (continuous or discontinuous) influences greatly on the efficiency of the electrocoagulation processes. Similar efficiencies are obtained for low (below 5 mg dm^?3) and high doses of aluminum (above 20 mg dm^?3). However, at intermediate doses a strong difference is observed, with a more marked decrease in the efficiency in the discontinuous process. This observation has been explained considering that the addition of aluminum in the continuous process is instantaneous (and not progressive as in the discontinuous one), and thus, the sweep coagulation mechanism is more favored in this operation mode.     

Separation of Pollutants from Restaurant Wastewater by Electrocoagulation

Abstract

Of late, electrocoagulation has been widely used to treat a wide variety of wastewaters, including textile, dye, electroplating, chemical mechanical polishing wastewaters, etc. Excessive coagulant material may be avoided by electrocoagulation. The contaminants present in wastewaters are maintained in solution by electrical charges. When metal ions of opposite electric charge, provided by an electrocoagulation system, may become unstable and precipitate in a form that is usually very stable. The present work involves the treatment of nearby restaurant effluent in Surat, Gujarat, India. Two different electrodes, aluminum and iron, are used for electrocoagulation. The effect of applied voltage and time of electrolysis on various parameters—such as conductivity, COD, TDS, and turbidity are studied. The removal efficiency of COD is found to be between 50–72% and the optimum time is between 15–30 minutes. Electrocoagulation proved to be a process which could neutralize pH significantly. The major impact of change in electrode is considered and aluminum is found to be better than iron in many respects. The operating cost is estimated from the power cost and cost of electrode material.     

高压脉冲电凝法处理电镀混合废水

高压脉冲电凝系统为当今新一代电化学水处理设备。对电镀含铬废水及混合废水中的锌、镍、铜、氰化物、磷、油等污染物有显著的治理效果，是较理想的电镀混合废水治理新工艺。尤其对大、中型电镀厂家具很好的推广应用价值。     

除草剂哌草丹的合成

哌啶为起始原料，先同光气反应合成哌啶酰氯；哌啶酰氯再与α，α-二甲基苄硫醇在催化剂的作用下缩合而得除草剂哌草丹。二步总收率为76．5％，原药纯度可迭95％以上。该项小试技术经优化后已投入批量生产。