Treatment and Utilization of Sodium Bromide-Containing Wastewater from Rubber Factories – Bromine Extraction by Membrane Method

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Rubber factories produce wastewater containing sodium bromide. Our company has been entrusted with a project funded by the Marine Bureau in 2014, titled \"Special Project for the Transformation and Industrialization of Achievements in Strategic Emerging Marine Industries – Use of Polytetrafluoroethylene Gas Membranes for the Extraction of Bromine from Seawater or Concentrated Seawater.\" The core technology behind this project is the polytetrafluoroethylene microporous hydrophobic membrane components that our company has recently developed. If the wastewater or liquid feed contains bromide ions Br-, chlorine gas can be added in appropriate amounts to convert these ions into elemental bromine (which is volatile and non-polar). Then, the pH of the liquid feed is adjusted to 3–4, and the liquid is passed through one side of the membrane, while sodium hydroxide is used on the other side to absorb it. Using this method, the bromine content in wastewater can be reduced to 10 mg/L, or even below 1 mg/L. The power consumption for this process generally does not exceed 1 ton per ton of wastewater. The consumption of chemical reagents does not exceed 1.2 times the stoichiometric ratio. The by-product is a high-concentration, high-purity mixed aqueous solution of sodium bromate and sodium bromide; of course, it can also be crude bromine liquid. If you’re interested, please contact me within the platform.