Advanced treatment of refractory sebacic acid wastewater

摘要

Advanced treatment of refractory sebacic acid (SA) present in wastewater discharges from SA manufacturing industry (SAWW) is reported. Ion exchange (IE), electrochemical oxidation (EO), EO coupled with electrocoagulation (EO-EC), wet air oxidation (WAO), and catalytic wet air oxidation (CWAO) experiments were conducted. It is found that SA can be efficiently removed from aqueous solutions using a strong base anion-exchange resin (Amberlite IR 400), which showed a breakthrough capacity of 49.0 mg SA/mL resin (0.485 meq/mL). However, presence of inorganic anions (SO_4~(2-), PO_4~(2-), Cl~-, and NOp is detrimental. Regeneration and reuse of spent resin, the effect of inorganic anions and morphology (SEM) of spent resin were also investigated. In addition, batch EO experiments conducted using Ti/RuO_2-Pt anode and stainless steel (SS) cathode showed poor mineralization efficiency (8.4%). Pd~(2+)-catalyzed WAO experiments performed in a high pressure reactor (473 K, 0.689 MPa, 2h) provided more efficient mineralization of SA (42.2%) compared with EO. The results constitute an important outcome which may be useful to SA manufacturing industry.