| abstract |
The adsorbable organic halogen (AOX) content of waste water is reduced by treating the water, in the sump phase or trickle phase, at 20-100 deg.C and 1-20 bars with an excess of H2, on a catalyst contg. Ni or Co.The waste water contains a high loading of inorganic salts, with 10-50 g/l (20-40 g/l) of inorganic halide, calc. as chloride. The Ni or Co are used as Raney catalysts. Treatment is continuous, at 30-90 (40-85) deg.C and 5-15 bars, pH 6-9 (6-8), and water feed of LHSV is 1-50/h (1-10/h), w.r.t. catalyst vol.. |