Treatment of effluent resulting from wool washing process ­ comprises physico­-chemical treatment for destabilizing emulsified systems formed and biological treatment of separated aqueous phase

Abstract

Treatment of effluent involves comprises: physico­-chemical treatment for destabilizing emulsified systems formed and biological treatment of separated aqueous phase. Emulsified systems are destabilized using 20­-1000mg/l polyelectrolyte(based on acrylamide), with sulphuric acid (optimum pH=3) or ferric chloride (optimum pH=5-­5.5) or 850­-1000mg/l reactive additive (13-­14 hours treatment). Two separable phases result, with 45-­60% emulsified organic compounds removal. Aqueous phase (yellow) is treated in second phase for 4­-5 hours in active biological sludge plant (for large quantities) or 7­-8 hours aerobic biofilter (for small quantities). Treated effluent is colorless, odorless, without suspensions, with 150­-200mg/l organic charge (CC)­Cr). Advance treatment may be accomplished by chemical oxidation with NaOCl (niu=30-­40% or (better) with O3(niu=50­-60%)). USE ­Process used to treat effluent resulted from washing of wool.