Pengolahan limbah cair yang mengandung logam besi, tembaga dan nikel dengan flotasi ozon. (Studi kasus pengaruh ozon dan konsentrasi zeolit terhadap kinerja proses) = Industrial disposal which contains iron metal, copper and nickel with ozone floatation. (Case study of ozone influence and concentration of zeolit to process performance) (Fakultas Teknik Universitas Indonesia, 2006)