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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

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

  • * 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


  • 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


    Thin stillage from dry corn milling ethanol plant
    Thin Stillage Treatment from Dry Corn Milling Ethanol Plant

    • Anaerobic Digestion (AD)

    • Fungal Biomass-to-Chitin and Chitosan


    Overview of production processes

    Ground Corn Treatment

    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


    Ad methane yield
    AD - Methane Yield Treatment

    Not Steady State

    S

    C

    S

    C

    S

    C

    S

    C


    Ad volatile solids
    AD - Volatile Solids Treatment

    Not Steady State


    Stillage digestion
    Stillage Digestion Treatment

    Corn Related Studies

    Thermophilic CSTR Studies


    Stillage digestion1
    Stillage Digestion Treatment

    • 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



    Objectives
    Objectives Treatment

    • 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


    Non woven filter nwf and polytetrafluoroethylene ptfe

    500 Treatmentμm

    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


    Ambr schematic
    AMBR Schematic Treatment


    Synthetic Wastewater Treatment

    COD = 500 mg/L


    Operation conditions
    Operation Conditions Treatment

    AMBR operating temperature: 25oC


    Reactor and permeate cod
    Reactor and Permeate COD Treatment

    HRT: 8 h

    HRT: 6 h

    HRT: 12 h


    Cod removal efficiency
    COD Removal Efficiency Treatment

    HRT: 8 h

    HRT: 6 h

    HRT: 12 h

    Bioreactor

    Membrane


    Biomass
    Biomass Treatment

    HRT: 8 h

    HRT: 6 h

    HRT: 12 h




    Sludge morphology
    Sludge Morphology Treatment

    suspended sludge

    attached sludge

    10μm



    Conclusions
    Conclusions Treatment

    • 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.


    Question? Treatment


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