Removal of AOX FRM bleach plant mill effluents by pH shift using

Details Removal of AOX FRM bleach plant mill effluents by pH shift using Removal of AOX FRM bleach plant mill effluents by pH shift using

1990-09-19

1992-06-09

Hruskoci, Peter

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

162 301, 162 3011, 162 33, 210726, 210737, 210752, 210761, 210908, 210919, 210928, C02F 158

Patent

active

051204487

ABSTRACT:
A process for removal of adsorbable organic chlorine (AOX) in which the acid-soluble AOX present in kraft chlorination (C.sub.D) effluents are destablized and converted to inorganic chloride by pH shift using the alkalinity and acidity sources available at the mill; C.sub.D effluent, typically having a pH of 1-2 and E.sub.1 effluent, typically having a pH of 9-12 can be mixed in various proportions to achieve a pH between 6.5-9.0 or the C.sub.D effluent is adjusted in pH to 6-11 with an alkaline composition so taht alkaline hydrolysis as well as precipitation of organic material occurs and the treated effluent contains less AOX than present in the original untreated effluents; the AOX removal is enhanced substantially by (i) the presence of a sulphide or (ii) by carrying out the alkaline treatment at elevated temperature and pressure.

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