The Wastewater Treatment Of Sodium Bromide Produced In Manufacturing Bromobutyl Rubber

When manufacturing bromobutyl rubber, two kinds of wastewater are produced. One is the main wastewater containing sodium bromide , the other is the minor wastewater. containing sodium bromide , sodium sulphate, sodium sulphite. To protect environment, it is necessary to find an effective way to treat these wastewaters.In all possible ways of wastewater treatment, Electrodialysis(ED) method is selected to treat the existed wastewater. Its advantage is to develop water source and prevent environment from being polluted, at the same time, to retrieve useful materials soluble in wastewater.Electrodialysis is one of the most important membrane methods for separation or concentration of ions in solutions based upon their selective electromigration through ion-exchange membrane, which applies to desalination of salted waters, production of ultra-pure water, wastewater treatment, concentration of dilute solutions, separation of electrolytes and non-electrolytes, and so on.The basic principles of electrodialysis and process flow were introduced in this thesis. We measured the limited current of various velocity and concentration of NaBr and concluded the formula of I,,m=0.007Ca748 u ?222.The paper mainly studied the desalination and concentration properties of NaBr, Na2SO4, Na2SO3 and their mixtures and measured their highest mass concentration obtained after they were treated by electrodialysis. From the experiment data, we calculated the parameters: desalination efficiency, current efficiency, energy consumption, etc. Experimental results show that the electrodialysis is technically feasible. It provides basic data for pilot-experiment and industry-enlargement.