Removal of dioxins, PCB's and other halogenated organic compound

Details Removal of dioxins, PCB's and other halogenated organic compound Removal of dioxins, PCB's and other halogenated organic compound

1985-03-21

1986-11-18

Castel, Benoit

Liquid purification or separation

Processes

Treatment by living organism

210626, 210631, 210909, C02F 308

Patent

active

046234640

ABSTRACT:
Combinations of physicochemical and biological treatment processes are capable of removing dioxins, polychlorobiphenyls (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 a high mixed liquor suspended solids concentration (>5000 mg/L). Powder 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 on not only on dioxins and PCB's but also on other toxic halogenated organic compounds. The treatment cost of this process is substantially less than either the conventional granular activated carbon adsorption technology or two stage treatment of biodegradation and carbon absorption.

REFERENCES:
patent: 4168228 (1979-09-01), Mallat et al.
patent: 4237002 (1980-12-01), Strudgeon et al.
patent: 4271013 (1981-06-01), Bhattacharyya
patent: 4292176 (1981-09-01), Grutsch et al.
Chem. Abstr., vol. 101:59561r, "Enhanced Biological Treatment of Leachates from Industrial Landfills", (1984).
Randall, T. L., "Wet Oxidation of PACT Process Carbon Loaded with Toxic Compounds", Proc. of the 38th Ind. Waste Conf. Purdue Univ., pp. 323-338 (1983).
Cormack, J. W. et al., "A Pilot Study for the Removal of Priority Pollutants by the PACT Process", Proc. of the 38th Ind. Waste Conf. Purdue Univ., pp. 403-415 (1983).

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