NEW LITERATURE Water clarification. New booklet takes mystery out of water clarification by clearing up some commonly misunderstood aspects of coagulation, flocculation and other aspects of water clarification. Bulletin has sections on coagulation theory, chemicals, equipment, process mixing and feeding, precipitation softening, and sludge handling. Nalco Chemical Co. 105 Computer planning. Brochure entitled "Urban and Environmental Technologies" is comprised of three sections: City Planning. Environment, and fnergy Systems. Computer Sciences Corp. 106 Tertiary treatment. Booklet discusses centrifugal waste water concentrators which remove most suspended solids from many effluents including those from paper, textile, tobacco, meat packing, potato, and poultry in107 dustries. SWECO. Inc.
Phosphate removal. Study entitled "Phosphate removal in secondary systems," describes method for practical phosphate removal from secondary effluents. Can-Tex I ndustries 113 Film. Free-loan film entitled "Slimming your Waste" describes current advances in solid waste processing and recycling through the eyes of a
homemaker. American Iron and Steel Institute, 201 East 42nd Street, New 'fork, N.Y., 10017 (Write direct.) Gel filtration chart. Wall chart measuring 18 by 25 in. shows upper exclusion limits, linear operating ranges, and lower exclusion limits of gel filtration materials. Bio-Rad Laboratories, 32nd & Griffin Avenues, Richmond, Calif. 94804 (Write direct.)
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The "Classic". for salinity measurements
Pelletizer. Literature describes an attendant-free, completely automatic system that changes dust to easily disposable pellets. Can be used with existing or planned dust collection system. Hartley Controls Corp. 108
I nstrumentation selection. Technical bulletin discusses variables involved in selecting appropriate instrumentation for waste water systems. Photos of typical installations and process flow diagrams illustrate text. Graver 109 Water Conditioning Co. Freon. Technical bulletin tells of the use of Freon fluorocarbon as an extraction solvent for determining the presence of oils and greases in waste water analysis. The product is highly volatile and low in residue on evaporation. I t is nonflammable and 110 low in toxicity. Du Pont
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Power plants. Reprint of technical paper reviews the status of technology for controlling pollutants from fossil fuel-fired power plants. Paper reviews state of the art of particulate collection and control of SO2 and NOx 111 emissions. Research-Cottrell Panel design. 12-page booklet highlight's Hach panel design and fabrication capabilities for engineered water analysis systems. Hach Chemical Co. 112 Need more information about any items? If so, j u s t circle the appropriate numbers on one of the reader service cards bound into the back of this issue and mail in the card. No stamp is necessary. Circle NO. 19 on Readers' Service Card
Volume 7, Number 2, February 1973
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