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Sludge Treatment

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  1. Sludge Treatment CE 326 Principles of Environmental Engineering Department of Civil, Construction and Environmental Engineering Iowa State University Prof. Tim Ellis Spring 2010

  2. Announcements • Monday, April 26th • Course review • Exam review • Wednesday, April 28th • 3rd Exam during lab period (in lab classroom) • Friday, April 30th • No class • A.S. design lab due

  3. History • Thomas Crapper • Myth or legend? The World War I doughboys passing through England brought together Crapper's name and the toilet. They saw the words T. Crapper-Chelsea printed on the tanks and coined the slang "crapper" meaning toilet (from : Plumbing and Mechanical, June 1993).

  4. Sludge Processes • Thickening • Stabilization • Conditioning • Dewatering • Volume Reduction • Disposal

  5. Thickening • c___________ sludge using gravity or f________ methods. Primary sludge can be thickened to a maximum of about 10% solids and secondary sludge to a maximum of about 6% solids. oncentrating lotation

  6. Gravity thickener

  7. Process flow with recycle:

  8. Dissolved Air Flotation (DAF) Thickener

  9. Dissolved Air Flotation (DAF) Thickener

  10. Stabilization rganics • Converting the o_______ in the sludge to more stable (inert) forms so they can be handled more easily (more d____________, less potential for odors) and used as soil conditioners. • Typically stabilization involves anaerobic or aerobic digestion. • During digestion considerable v______ s_____ destruction occurs ewaterable olatile olids

  11. Conditioning • Addition of c_________ to allow better separation of the water and the solids. Ferric c_______ and organic and inorganic p_______ are frequently used for sludge conditioning. oagulant hloride olymer

  12. Dewatering • V________, pressure, or drying methods for removing w_____ from the solids. • Typically about 25 to 35% solids can be achieved. acuum ater

  13. Volume Reduction • Drying and p__________ for sale as a fertilizer • C__________ • I___________ of sludge with ash residual for ultimate disposal. elletization omposting ncineration

  14. Biosolids • Biosolids are t_______ s______; • there are two different classes: • Class A: no detectable levels of p___________ and meets m_____ regulations, requires controlled treatment process involving high pH, temperature, or both; no permit required for land application • Class B: have been t_______ but may contain some pathogens and metals, requires permit for land application • approximately __% of all biosolids are land applied reated ludge athogens etals reated 50

  15. Processes for Class A • Processes for generating Class A biosolids: • sludge p___________ • T____________ treatment (55̊C for 24 h) • temperature p______ anaerobic digestion (55̊C digester followed by 35̊C digester) developed at ISU asturization hermophilic hased

  16. Anaerobic Digestion

  17. Steps in Anaerobic Digestion Hydrolysis Acidogenesis Acetogenesis Methanogenesis

  18. Fixed vs. floating cover

  19. Belt Filter Press

  20. Filter Press http://www.metlabsolutions.com/Shriver%20Press%20-%20side.JPG

  21. Centrifuge

  22. Land Application

  23. Characteristics • Blackish in color • 15% - 90% Solids • Mud-like to granular appearance • Mild to strong odor (musty or swamp like)

  24. View of machine used to aerate compost placed in windrows.

  25. Overview of windrow composting operation

  26. Plants Grow Better with Biosolids

  27. Tree Rings Before and After Organic Matter Applied

  28. Back River WWTP

  29. Back River WWTP

  30. Back River WWTP

  31. Back River WWTP

  32. Abu Dhabi WWTP

  33. Abu Dhabi WWTP

  34. Abu Dhabi WWTP

  35. Abu Dhabi WWTP

  36. Abu Dhabi WWTP

  37. Budapest WWTP

  38. Lake Balaton WWTP

  39. Lake Balaton WWTP

  40. Lake Balaton WWTP

  41. Lake Balaton WWTP

  42. Wastewater Treatment in Developing Countries Community Biogas Plant in China

  43. Shouguang City WWTP, PRC

  44. Shouguang City WWTP, PRC