ENV_6016_Lect1&2_Intro&WW_2013

Useful references wastewater engineering treatment

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Useful References WASTEWATER ENGINEERING: TREATMENT, DISPOSAL, REUSE, by Metcalf and Eddy, Inc., McGraw-Hill, Third Edition, 1991. BIOLOGICAL PROCESS DESIGN FOR WASTEWATER TREATMENT, by L.D. Benefield and C.W. Randall, Prentice-Hall, 1980. DESIGN AND RETROFIT OF WASTEWATER TREATMENT PLANTS FOR BIOLOGICAL NUTRIENT REMOVAL, by Randall, C.W., Barnard, J.L., Stensel, H.D., Technomic Publishing Co., Lancaster, Pa., 1992. ELEMENTS OF BIOENVIRONMENTAL ENGINEERING, by A.F. Gaudy & E.T. Gaudy, Engineering Press, Inc., San Jose, California, 1988. BIOLOGY OF MICROORGANISMS, 7 th Ed. or later, by Brock, Madigan, Martinko, and Parker, Prentice Hall, Englewood Cliffs, New Jersey, 1994 or later. BIOLOGICAL WASTEWATER TREATMENT,2 nd Edition by C.P. Leslie Grady, Jr., G.T. Daigger, and H.C. Lim, Marcel Dekker, Inc., New York, New York, 1999. BIOLOGICAL AND CHEMICAL SYSTEMS FOR NUTRIENT REMOVAL, Water Environment Federation, Alexandria, Va., 1998. ANAEROBIC BIOTECHNOLOGY, by R.E. Speece, Archae Press, Nashville, Tennessee, 1996.
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Lecture 2 – Wastewater Constituents Wastewater Characteristics Wastewater contains a dissolved and particulate fraction. Both these fractions consist of organic and inorganic compounds. Typically with domestic wastewater our primary concern is organic material which is present in both dissolved and particulate (i.e. TSS) form. Because of the complexity of these organics which consist of polymeric lipids, polysaccharides, proteins and their monomers, we use several parameters to characterize organic carbon: BOD 5 – biochemical oxygen demand COD – chemical oxygen demand TOC – total organic carbon NPDES permits use BOD 5 as the effluent standard for organic carbon although COD is much more repeatable and accurate as a test, and therefore more useful for understanding the performance of a process or conducting meaningful mass balances. However COD also measures the oxygen demand associated with non-degradable organic and inorganic compounds in the wastewater since it is a chemical digestion. Typical correlation’s given in the literature: Metcalf & Eddy (1991): BOD 5 /COD = 0.4 to 0.8 for domestic WW BOD 5 /TOC = 1.0 to 1.6 for domestic WW BOD U = (BOD 5 )/(0.68) Grady, Daigger & Lim (1999): COD TOTAL =2.1 (BOD 5 ) BOD U =1.5(BOD 5 ) COD BIODEGRADABLE =1.14(BOD U )=1.71(BOD 5 ) A “T” or “S” before a parameter acronym designates total (unfiltered) and soluble (filtered, typically through a 0.45 micron membrane filter). TCOD – total COD SCOD – soluble COD TCOD – SCOD = PCOD (particulate COD, i.e. the COD associated with the TSS in the sample) Typically the PBOD is completely hydrolyzed by the microorganisms in an A.S. system. So to quantify the strength of a wastewater TCOD or TBOD must be measured. However measuring the SCOD or SBOD is also important, and in the case of BNR (biological nutrient removal) facilities further characterization of the influent fractions is necessary to conduct a proper design (i.e.
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  • Spring '13
  • RANDALL
  • Sewage treatment, nutrient removal, BNR

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