Waste Minimization in Chromium Plating Industry Waste Minimization in Chromium Plating Industry
نویسندگان
چکیده
Membrane electrolysis (ME) is the only commercial technology using ion-exchange membranes for chromic acid recycling and recovery. On one hand, the technology has a number of promising advantages, but on the other hand, it has not yet gained common acceptance probably due to a lack of operation stability and efficiency. Published results of the research can be divided into three categories: lab scale studies, patents and systems, which have already been used at industrial scale. Furthermore, this literature review includes electro-electrodialysis (EED) and an overview about anion exchange membranes (AEM) used for applications with chromate containing solutions.
منابع مشابه
Evaluation of optimal waste management in the plating industry based on the Delphi Method and Fuzzy Analytic Hierarchy Process (Case Study: Paitakht Industrial District of Tehran)
The plating industry is one of the main toxic chemicals consumers, which uses various chemicals, including solvents, acids, bases, cleansers, sophisticated organic ingredients, and metal salts of cadmium, nickel and chromium. Due to the growing production of industrial waste in spite of actions related to these wastes’ management, no comprehensive pattern was introduced at different levels. Thi...
متن کاملEtal Recovery from Waste Sludges
Waste metals in the form of metal oxide (hydroxide) sludges are generated in significant amounts by the metal finishing industries, and their accumulations pose problems for disposal and challenges for recycle. The availability of technically feasible efficient separations of metals such as nickel, cobalt, chromium, cadmium, copper, tin, zinc, lead, manganese, molybdenum, and titanium from plat...
متن کاملAn Example of Economic Plating Waste Treatment by Reverse
The large volumes of water used in rinsing operations in the plating industry may contain cyanides, chromium, nickel, and zinc, resulting in a substantial loss of valuable plating chemicals. From an economic viewpoint, particular consideration should be given to measures that will permit recovery of chemicals and water for reuse. In view of the wide variety of conditions found in plating practi...
متن کاملPlating with Trivalent Chrome
Hexavalent chromium wastes need to be chemically reduced to trivalent chrome in the shop’s treatment plant. This necessitates the use of expensive chemicals such as sulfur dioxide, sodium metabisulfite or sodium borohydride. Also considerable hazardous sludge is generated during the neutralization step of the treatment process due to the high chromium concentration of the plating solutions. Haz...
متن کاملZinc recovery and waste sludge minimization from chromium passivation baths.
This work reports the feasibility of applying emulsion pertraction technology (EPT) aiming at zinc recovery and waste minimization in the zinc electroplating processes that include Cr (III) passivation. The assessment consists of firstly the lifetime extension of the passivation baths by selective removal of the tramp ions zinc and iron, and secondly, the recovery of zinc for further reuse. Spe...
متن کامل