Emulsion liquid membrane for the recovery chromium (VI) from effluents using monosuccimide and bisuccimide as surfactant

An emulsion liquid membrane (ELM) process is being developed for application to many industrial waste treatment problems. Using the ELM technique to remove chromium (VI) from electroplating effluent with the objective of reducing levels to below allowable discharge limits was investigated. In this work, tertiary amine N7301 was chosen as a carrier. In establishing a mental recovery process using ELM, the choice of a suitable surfactant is a key factor. Monosuccimide L113A, bissuccimide L113B, and Span 80-three surfactants-were examined. The emulsion made of L113A or L113B had a good efficiency in removal of chromium (VI) from electroplating effluent and were stable, which could still attainted a reasonable result after 60 days of being made. The electroplating effluents were treated with the emulsion made of L113A or L113B. A total of 184 mg Cr/L in the effluent decreased to 0.35 mg Cr/L in one run, and 673 mg Cr/L reduced to 0.25 mg Cr/L by using a two-stage process. The concentration of chromium (VI) in internal phase could reached 8 g/L, which could be reused directly.