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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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slide1

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

slide2

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
slide3

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 from Dry Corn Milling Ethanol Plant
  • Anaerobic Digestion (AD)
  • Fungal Biomass-to-Chitin and Chitosan
overview of production processes

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

ad methane yield
AD - Methane Yield

Not Steady State

S

C

S

C

S

C

S

C

ad volatile solids
AD - Volatile Solids

Not Steady State

stillage digestion
Stillage Digestion

Corn Related Studies

Thermophilic CSTR Studies

stillage digestion1
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
objectives
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
non woven filter nwf and polytetrafluoroethylene ptfe

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

slide14

Synthetic Wastewater

COD = 500 mg/L

operation conditions
Operation Conditions

AMBR operating temperature: 25oC

reactor and permeate cod
Reactor and Permeate COD

HRT: 8 h

HRT: 6 h

HRT: 12 h

cod removal efficiency
COD Removal Efficiency

HRT: 8 h

HRT: 6 h

HRT: 12 h

Bioreactor

Membrane

biomass
Biomass

HRT: 8 h

HRT: 6 h

HRT: 12 h

sludge morphology
Sludge Morphology

suspended sludge

attached sludge

10μm

conclusions
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.