Wastewater treatment process

Liquid purification or separation – Processes – Treatment by living organism

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210617, 210625, 210630, 210903, C02F 330

Patent

active

057334552

ABSTRACT:
A wastewater treatment process having improved solids separation characteristics and reduced biochemical oxygen demand (BOD) in the purified wastewater comprising the steps of: passing wastewater containing suspended solids and biodegradable organic substances through a main aerobic biological oxidation zone and therein oxidizing a portion of the BOD and converting a portion of the BOD into additional suspended solids and at least a portion of the ammonia nitrogen content (NH.sub.3 --N) of the wastewater is oxidized to nitrate nitrogen (NO.sub.3 13 N); passing the effluent from said aerobic biological oxidation zone to an aerobic/mixing zone and therein mixing said effluent with effluent from the anoxic/anaerobic zone; passing the effluent from said aerobic/mixing zone to a settling zone and therein separating purified wastewater having reduced BOD and suspended solids, and sludge containing suspended solids; passing a portion of the sludge formed in the settling zone and volatile acids to an anoxic/anaerobic zone and therein increasing the extracellular polymer content of said sludge, the release of phosphorus into solution and the reduction of nitrate nitrogen to molecular nitrogen gas; and recycling an effective amount of the effluent from said anoxic/anaerobic zone to said aerobic/mixing zone.

REFERENCES:
patent: 2391494 (1945-12-01), Walker
patent: 2517792 (1950-08-01), Kraus
patent: 3220706 (1965-11-01), Valdespino
patent: 3654147 (1972-04-01), Levin et al.
patent: 4056465 (1977-11-01), Spector
patent: 4488967 (1984-12-01), Block et al.
patent: 4522722 (1985-06-01), Nicholas
patent: 4663044 (1987-05-01), Goronszy
patent: 4725357 (1988-02-01), Downing et al.
patent: 4874519 (1989-10-01), Williamson
patent: 4915840 (1990-04-01), Rozich
patent: 4999111 (1991-03-01), Williamson
patent: 5022993 (1991-06-01), Williamson
Norris, D.P., Parker, D.P., Daniels, M.L., and Owens, E.L. 1980. "Efficiencies of Advanced Waste Treatment Obtained with Upgraded Trickling Filters." Civil Engineering-ASCE, 48:96-101.
Norris, D.P., Parker, D.P., Daniels, M.L., and Owens, E.L. 1982. "High Quality Trickling Filter Effluent without Tertiary Treatment." J. Wat. Poll. Cont. Fed., 54:1087-98.
Fedotoff, R.C. 1983. "The Trickling Filter Finds New Partner." Water Engineering & Management, Jun.:28.
Niku, S., et al. 1982. "Reliability and Stability of Trickling Filter Process." J. Wat. Poll. Cont. Fed., 54:129-34.
Forster, C.F. 1971. "Separation of Activated Sludge Using Natural and Synthetic Polymers." Water Pollution Control, 71:363-71.
Wilkinson, J.F. 1958. "The Extracellular Polysaccharides of Bacteria." Bacteriol. Rev., 22:46.
Tenny, M.W., and Stumm, W. 1965. "Chemical Flocculation of Microorganisms in Biological Waste Treatment." J. Wat. Poll. Cont. Fed., 37:1370-88.
Gulas, V., Bond, M., and L. Benefield 1979. "Use of Exocellular Polymers for Thickening and Dewatering Activated Sludge." J. Wat. Poll. Cont. Fed., 51:798-807.
Pavoni, J., Tenny, M., and Echelberger, Jr., W. 1972. "Bacterical Exocellular Polymers and Biological Flocculation." J. Wat. Poll. Cont. Fed., 44:414-31.
Friedman, B., et al. 1970. "Structure of Exocellular Polymers and their Relationships to Bacterial Flocculation." J. Bacteriol., 98:1328-88.
Kiff, R.J. 1978. "A study of the Factors Affecting Bioflocculation in the Activated Sludge Process." Water Pollution Control, 77:464-70.
Harris, R.H., and Mitchell, R. 1975. "Inhibition of the Bioflocclation of Bacteria by Biopolymers." Water Research, 9:993-99.
Symons, J., McKinney, R., and Hassis, H. 1960. "Procedure for Determination of the Biological Treatability of Industrial Wastes. " J. Wat. Poll. Cont. Fed., 32:841-52.
Weng, C., and Molof, A.H. 1974. "Nitrification in the Biological Fixed-Film Rotating Disk System. " J. Wat. Poll. Cont. Fed., 46:1676.
Geher, R., and Henry, J.G. 1983. "Removal of Extracellular Materials: Technicals and Pitfalls." Water Research, 17:1743-48.
Novak, J.E., and Haugan, B.E. 1981. "Polymer Extraction from Activated Sludge. " J. Wat. Poll. Cont. Fed., 53:1420-24.
Brown, M.J., and Lester, J.N. 1980. "Comparison of Extracellular Polymer Extraction Methods." Appli. & Environ. Microbiol., 40:179-86.
Osborn, D. W. "Sewage Purification in South Africa - Past and Present ", ISSN 0378-4738=Water SA Vol. No.3. Jul. 1988.
Eckenfelder, W. Wesley, Jr., "Biological Phosphorus Removel : State of The Art Review, Pollution Engineering, 88-93 (Sep., 1987).
Barnard James L., "Activated Primary Tanks for Phosphate Removal", Water SA, 10, No. 3, 121-126 (Jul. 1984).
Air Products and Chemical, Inc. Brochure entitled "Environmental Products Update, 2 pages (Jan. 1988).
Single page from Air Products and Chemicals, Inc. brochure commencing "Reviewing the features of the UCT process . . . " (date unknown).
Dagger et al. . . . Journal WPCF 60, No. 10, P. 1834, (date unknown).

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