Techno-economical comparison of conventional hydroxide precipitation and electrocoagulation for heavy metal removal from industrial wastewater
Techno-economical comparison of conventional hydroxide precipitation and electrocoagulation for heavy metal removal from industrial wastewater
复制标题
传统氢氧化物沉淀与电絮凝去除工业废水重金属的技术经济比较
作者：
J. Rodriguez;M. Schweda;S. Stopić;B. Friedrich
采用传统的串联系统和新型电凝聚法（EC），通过中和/沉淀两种工艺处理工业废水。目的是将铜和锰等金属的浓度降低到1毫克/升以下。污水由RTB-BOR提供，RTB-BOR是塞尔维亚铜矿开采和冶炼综合体，是欧盟资助的INTREAT项目的一部分。它的重点是防止区域水资源受到污染，因为目前含有重金属的废水排放到这些区域。尽管电凝聚在世纪前就获得了专利，但这一过程背后的操作机制并不确定，这与化学沉淀的情况相反。EC-方法被描述为两个协同过程的总和，并行工作，但彼此分开。一方面，混凝过程被认为是一个逐步机制的基础上，在水化学的金属阳离子。它从水解开始，然后是冷凝和络合机制，形成胶体聚集体，然后充当凝结剂。另一方面，平行工作的电沉积机制通过在较低pH值下去除重金属来确保工艺的效率，充当溶解在废水中的所有外来阳离子的磁铁。这两种工艺都符合排放要求，但在原材料使用、能源需求和排放要求方面的效率以及运营成本等方面，观察到与应用机制有关的重大差异。与广泛使用的化学沉淀法（如级联系统）相比，EC工艺具有重大优势，本出版物将介绍该工艺。
Treatment of industrial wastewater was performed by means of two neutralization/precipitation processes, using a conventional cascade line system and a novel electrocoagulation method (EC). The aim was to decrease the concentration of metals as Cu and Mn below 1 mg/l. Effluents were provided by RTB-BOR, a Serbian copper mining and smelting complex being part of the EU funded project INTREAT. It focuses on the prevention of regional water resources contamination, where effluents containing heavy metals are currently discharged. Despite the fact that electrocoagulation was patented a century ago, there is no certainty about the operating mechanism behind this process, which is much the opposite case from chemical precipitation. The EC-method is described as the sum of two synergetic processes, working in parallel but acting separately one from another. On one hand, the coagulation process is considered as a stepwise mechanism based on fundamentals in the aqueous chemistry of metal cations. It starts with a hydrolysis, followed by condensation and complexation mechanisms, building colloidal conglomerates, which then act as the coagulant. On the other hand, the electrodeposition mechanism, working in parallel, ensures the efficiency of the process by removing heavy metals at lower pH values, acting as kind of a magnet for all foreign cations dissolved in the wastewater. Both processes have met discharge requirements, but significant differences related to applied mechanisms were observed, concerning material raw usage, energy demand and efficiency in terms of discharge requirements and operational costs among others. The EC-process has major advantages in comparison to the widespread chemical precipitation as in a cascade line system, which will be presented in this publication.
DOI：
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发表时间：
2022
期刊：
影响因子：
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作者：
Masaharu Motoshita;Hiroki Hatayama;Ryosuke Yokoi;Kamrul Islam
通讯作者：
Kamrul Islam