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CE3503 Environmental Engineering

CE3503 Environmental Engineering. Wastewater Treatment. Dr. Martin T. Auer MTU Department of Civil & Environmental Engineering. Federal Water Pollution Control Act Amendments of 1972 (The Clean Water Act) Technology-based effluent limits Water quality-based effluent limits

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CE3503 Environmental Engineering

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  1. CE3503 Environmental Engineering Wastewater Treatment Dr. Martin T. Auer MTU Department of Civil & Environmental Engineering

  2. Federal Water Pollution Control Act Amendments of 1972 (The Clean Water Act) • Technology-based effluent limits • Water quality-based effluent limits • Total Maximum Daily Loads (TMDLs) • National Pollutant Discharge Elimination System (NPDES) Add Clark In A Watershed – Everyone Lives Downstream

  3. Receiving Water Impacts River DO Model Q = 8 C = 0, 250, 100

  4. Michigan NPDES Permit

  5. Treatment Plant Design Design Model Cin = 250 k = 0.1 V = 0, 250, 750

  6. Federally-Regulated Non-Domestic Sources Aluminum Forming Battery Manufacturing; Cement Manufacturing; Coil Coating & Can Making; Copper Forming; Dairy Products Processing; Electrical & Electronic Component Manufacturing; Electroplating & Metal Finishing; Explosives Manufacturing; Fruit & Vegetable Processing; Ferroalloy Manufacturing; Fertilizer Manufacturing; Glass Manufacturing; Gum & Wood Chemicals Manufacturing; Ink Formulating; Inorganic Chemical Manufacturing; Iron & Steel Manufacturing; Leather Tanning & Finishing; Meat Products Processing; Metal Molding & Casting; Mining Operations; Nonferrous Metals Processing; Organic Chemicals, Plastic & Synthetic Fibers Manufacturing; Paving & Roofing Materials Manufacturing; Soap & Detergent Manufacturing; Petroleum Refining; Pesticide Manufacturing; Porcelain Enameling; Pharmaceutical Manufacturing; Plastic Molding & Forming; Pulp, Paper and Paperboard Manufacturing Timber Products Processing; Textile Mills http://www.socwa.com/indwaste.htm

  7. Chemicals Designated as Priority Pollutants (126) • AROCLOR 1254 (industrial product; banned) • BENZENE (industrial product) • BENZO(A)PYRENE (asphalt roofing manufacture) • CADMIUM (heavy metal; electric/gas industries) • CHLORDANE (pesticide; banned or restricted) • CHROMIUM (heavy metal; widely used in industry) • DDT (pesticide; banned or restricted) • ENDRIN (pesticide; banned or restricted) • MERCURY (heavy metal; electric/gas and chemical industries) • PENTACHLOROPHENOL (industrial chemical – wood products) • TOLUENE (widely used industrial chemical) • TRICHLOROETHYLENE (industrial solvent, degreaser) http://www.scorecard.org/chemical-groups/one-list.tcl?short_list_name=pp

  8. What’s in wastewater? Waste • human feces and urine • food from sinks • soaps and other cleaning agents • runoff from streets and lawns • industrial discharges

  9. What’s in wastewater? Water • lots of it! • Urinal - 1 gallon per flush • Toilet - 4 gallons per flush • Shower - 20 gallons per use • Overall - 55 gal/person/day

  10. It’s mostly water! There are about 500 parts of waste in every 1 million parts of wastewater; that’s 500 ppm. H2O It’s like trying to find this class at a sold out Packers game!

  11. So what’s the problem? P SNOT: it’s not a pretty picture!

  12. Composition of Domestic Wastewater ConstituentInfluentEffluent Suspended Solids 200-300 30 BOD5 200-400 30 Ammonia Nitrogen 20-40 1-2 Phosphorus 7-10 1 Fecal Coliforms 104-106 200 All concentrations are mg/L, except fecal coliforms which are colony forming units (cfu) per 100 mL.

  13. This is really not something I’ve given a lot of thought to. Where does it go when you flush the toilet?

  14. Collection Systems

  15. P Hancock P Houghton G Franklin Sq. Surface; 30” G Super 8 Near Surface; 30” G MTU 10’;36” G M&M Bldg. Lake; 48” POTW 20’; 48” P Portage Lake Sewer System

  16. Diurnal Variation in Wastewater Flow Metcalf & Eddy

  17. Wet-Dry Variation in Wastewater Flow Metcalf & Eddy

  18. Bar Rack

  19. Screen

  20. Comminutor

  21. Grit Chamber

  22. horizontal flow clarifier upward flow clarifier

  23. Preliminary Treatment Overview from pumps or wet well Bar Rack or Screen or Comminutor Grit Chamber Flow Equalization to primary treatment

  24. Primary Treatment – Rectangular Clarifier

  25. Primary Treatment – Circular Clarifier

  26. (From Kiely, 1997)

  27. Secondary or Biological Treatment Simple carbohydrates (a form of organic matter) are produced by plants through the process of photosynthesis. These are then converted to more complex carbohydrates and other forms of organic matter such as starches, fats and proteins. simple . The sun’s energy, captured during photosynthesis, is stored in the chemical bonds of this organic matter. Organisms (from bacteria to humans) take up and metabolize organic matter to obtain the energy required to support life. In secondary or biological treatment, we utilize microorganisms to remove the dissolved and small particulate organic matter which would exert an oxygen demand if it were released to the environment. The waste (actually organic matter) is simply converted into another form (microorganisms) which can then be separated from the waste stream by settling yielding a clean effluent.

  28. The Microbial Loop in Nature

  29. Microorganisms in Secondary or Biological Treatment Source: http://www.college.ucla.edu/webproject/micro7/studentprojects7/Rader/asludge2.htm

  30. The Microbial Loop in Secondary Treatment

  31. Secondary Treatment – Trickling Filter

  32. Secondary Treatment – Trickling Filter Filter Media Image Source: Wastewater Engineering, Metcalf & Eddy

  33. Secondary Treatment – Rotating Biological Disks

  34. Secondary Treatment – Activated Sludge

  35. The Monod Curve (From Kiely, 1997)

  36. Batch Growth Curve

  37. Log Growth Endogenous Growth Declining Growth F/M Ratio versus BOD Removal Efficiency (From Kiely, 1997)

  38. Activated Sludge: aeration (diffuser)

  39. Activated Sludge: aeration (mechanical)

  40. Activated Sludge: Plug Flow Configurations Plug Flow (Conventional) (From M&E)

  41. Activated Sludge: Plug Flow Configurations (From M&E)

  42. Activated Sludge: Plug Flow Configurations (From M&E)

  43. Activated Sludge: Completely Mixed Flow Configurations (From M&E)

  44. Activated Sludge: Completely Mixed Flow Configurations (From M&E)

  45. Secondary Clarifier

  46. Disinfection (UV light)

  47. Putrescible putrid: in a state of foul decay, as animal or vegetable matter putrescible: liable to become putrid

  48. Anaerobic Digestion: Biochemistry

  49. Anaerobic Digestion: Reactors

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