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AD Applications to Industrial Wastewater

AD Applications to Industrial Wastewater. Shihwu Sung, Ph.D., PE. Department of Civil, Construction & Environmental Engineering Iowa State University. Anaerobic Treatment Short Course Part 5. Background AD Fundamentals * Wastewater Characteristics Analysis

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AD Applications to Industrial Wastewater

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  1. AD Applications to Industrial Wastewater Shihwu Sung, Ph.D., PE Department of Civil, Construction & Environmental Engineering Iowa State University Anaerobic Treatment Short Course Part 5

  2. Background • AD Fundamentals • * Wastewater Characteristics Analysis • * Anaerobic Treatment Processes • (Traditional vs. High-Rate) • AD Applications to Sewage Sludge • AD Applications to Animal Wastes • AD Applications to Industrial Wastewaters • Beneficial Use of Biosolids & Regulations • AD Bio-refinery Concept

  3. Best candidates of Industrial Wastewaters for Anaerobic Treatment • Alcohol production • Brewery and Winery • Sugar processing • Starch (barley, corn, potato, wheat, tapioca and desizing • waste from textile industry. • Food processing • Bakery plant • Pulp and paper • Dairy • Slaughterhouse • Petrochemical waste

  4. Thin Stillage from Dry Corn Milling Ethanol Plant • Anaerobic Digestion (AD) • Fungal Biomass-to-Chitin and Chitosan

  5. Ground Corn Slurry Tank Liquefaction Unit Distillation System Ethanol Fermentor DDGS DWG (10-12% H2O) DWGS (60-65% H2O) Rotary Drier #2 Rotary Drier #1 (30% H2O) Centrifuge Whole Stillage (90%) (10%) (88% H2O) Syrup Evaporator (60%H2O) (94% H2O) DWG : Distiller's Wet Grains Condensate DWGS: Distiller's Wet Grains with Solubles DDGS: Distiller's Dried Grains with Solubles Overview of Production Processes Thin Stillage

  6. AD - Methane Yield Not Steady State S C S C S C S C

  7. AD - Volatile Solids Not Steady State

  8. Stillage Digestion Corn Related Studies Thermophilic CSTR Studies

  9. Stillage Digestion • Energy Recycling (Basis: 45 Mgal/yr at MGP) • Displace 43% to 59% of natural gas usage • High: $17 million/year • Low: $7 million/year • Likely: $10 million/yr • Saving a dime per gallon

  10. Anaerobic Membrane Bioreactor (AMBR)

  11. Objectives • Demonstrate the performance of AMBR to treat synthetic =wastewater at different HRT • Investigate the dynamics of methanogenic activity during start-up of AMBR • Elucidate the role of cake on the membrane surface as a biofilm or secondary membrane

  12. 500μm Non-woven Filter (NWF) and Polytetrafluoroethylene (PTFE) • NWF: random, entangled and multi-layer assembly of fibers • Formation of dynamic membrane by either pore clogging • or cake-layer formation PTFE laminated non-woven filter Non-woven filter

  13. AMBR Schematic

  14. Synthetic Wastewater COD = 500 mg/L

  15. Operation Conditions AMBR operating temperature: 25oC

  16. Reactor and Permeate COD HRT: 8 h HRT: 6 h HRT: 12 h

  17. COD Removal Efficiency HRT: 8 h HRT: 6 h HRT: 12 h Bioreactor Membrane

  18. Biomass HRT: 8 h HRT: 6 h HRT: 12 h

  19. Particle Size Distribution

  20. Summary: AMBR Performance

  21. Sludge Morphology suspended sludge attached sludge 10μm

  22. Methane Yield and Biogas Composition 8 6 HRT (h)

  23. Conclusions • AMBR system was able to treat low strength wastewater at HRT as low as 6h with effluent quality better than the conventional activated sludge process. • AMBR system produced nearly zero excess sludge. • Membrane in AMBR system complemented the decrease in biological removal efficiency. • About 65 to 75% of the influent COD was converted into methane gas. • AMBR could be used to treat low strength wastewater.

  24. Question?

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