Lg Chem, Ltd

Kyeong Hyeon Jo

Jun Seok Ko

Seung Whan Oh

Suk Yung Oh

Yong Heon Cho

Joo Sik Oh

A method for purifying of waste water includes: supplying a mixed stream, in which wastewater including water, a nitrile-based monomer, and ammonia and an acid component are mixed, to a first column; condensing an upper discharge stream of the first column, supplying the condensed stream to a decanter to separate the stream into a water layer and an organic layer, and supplying components of the organic layer to a second column; and separating a by-product from a lower discharge stream of the second column, and recovering the nitrile-based monomer from an upper discharge stream of the second column.

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Daejeon, South Korea

Kyeong Hyeon Jo