Wet air oxidation can be used effectively to treat aqueous are too dilute to incinerate and yet too toxic to biotreat. waste streams which
C. H. Brown is an environmental control technolo y development engineer in the Chemical Techno ogy Div~s~cnr at the Oak Ridge National Laboratory. He joined ORNL in 1974 and has worked on various projects including wastewter and offgas cleanup for several technologies including coal conversion vialiquefaction. He hasa B.S. and M.S. in chemical eiigincerinx from Virginia Polytechnic Institute and State University and University of Tennessee, respectively. Michael T. Hams is a development engineer in the Engineering Develo ment Section, Chemical Technology Division, oPthe Oak Ridge National Laboratory. He has been involved with several municipal and industrial wastewater treatment development projects, He received a B.S. d e with honors, in chemical engineering Mississippi State University. He is currently pursuing an M.S. degree in chemical engineering at the University of Tennessee.t R e wastewater treatment system becomes an integral part vated sludge process (Figure 1). Powdered activated carbon addition enhances removals of adsorbable organics and toxics, permitting improved biological oxidation and nitrification of these wastewaters. Improved treatment stability is obtained by the adsorption of shock organic loads. When carbon regeneration is used in conjunction with the PACT system, secondary biological sludge disposal is eliminated and spent powdered carbon is regenerated for reuse.Evaluations by Castaldi and Ford [3] have shown the PACT system and Wet Air Regeneration combination to be cost-effective for treatment of Lurgi gasifier wastewaters compared to activated dud e systems employin wasteOther studies have shown that reliable treatment is obtained with PACT and Wet Air Regeneration combination sludge incineration or lan % disposal of waste s 7 udges. l-6, 71.
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