C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
362/12
C02F 1/66 (2006.01) C02F 1/72 (2006.01) C02F 3/02 (2006.01) C02F 3/12 (2006.01)
Patent
CA 1277045
ABSTRACT Combinations of physicochemical and biological treat- ment processes are capable of removing dioxins, polychlorobi- phenyls (PCB's) and other halogenated organic compounds from wastewaters; the dioxins and PCB's are removed by at least 90 percent in the pretreatment steps of neutralization, oxidation, and sedimentation; the residual amounts are removed in a powdered activated carbon enhanced sequencing batch reactor (PAC-SBR) operating at high mixed liquid suspended solids concentration ( > 5000)mg/L); power activated carbon (PAC) is supplemented to the bioreactor to ensure complete removal of the dioxins (<0.8 ppt) and PCB's (<2 ppb); the PAC-SBR enhanced biological treatment process is capable of meeting stringent effluent limits not only on dioxins and PCB's hut also on other toxic halogenated organic compounds; the treatment cost of this process is sub- stantially less than either the conventional granular acti- vated carbon adsorption technology or two stage treatment of biodegradation and carbon absorption.
498118
Sojka Stanley A.
Ying Wei-Chi
Occidental Chemical Corporation
Swabey Ogilvy Renault
LandOfFree
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