Biogas

What are the stages of anaerobic digestion

- Hydrolysis Phase - Acidification Phase - Acetogenic Phase - Methanogenic Phase (View the picture up Top BOI)

Name two studied feedstock options for biogas.

- Landfill Leachate - Shrimp processing waste

What are the advantages of converting waste into biogas? (List 4)

- Reduced odors (from manure) - High quality fertilizer ( the nitrogen content in the manure) - Reduced surface and groundwater contamination - Pathogen reduction

What are some feedstocks for Biogas? (List 5)

- Sewage sludge - Municipal solid waste - Manure - Forestry waste - Agricultural waste - Industrial food processing waste - Energy Crops (Corn)

What are the drawbacks of treating the aged Landfill Leachate?

Aged Leachate has a lower production potential the COD and BOD are lower

What is Anaerobic digestion?

Anaerobic digestion is the decomposition of organic matter by microbes in an oxygen free environment

What is Biogas?

Biogas is flammable gas produced form renewable resources

Factors studied for Landfill Leachate

Concentration of H2O2 Concentration of Fe2+ Time pH Mass ratio of H2O2/Fe2+

Phase 1 of Anaerobic Digestion

Hydrolysis phase

What are the drawbacks of using landfill leachate?

It is hard to hydrolysis

Landfill Leachate v.s. Shrimp waste for biogas production

Landfill Leachate annual biogas production= 38.33 Million Liters / year Shrimp waste annual production potential= 251 Million Liters /year. Shrimp waste has the higher production potential.

What is the compostion of biogas?

Methane: 50-75% Carbon Dioxide: 25-45% Oxygen: 2-7% Nitrogen: <2% Ammonia: <1% Hydrogen Sulfide: <1%

What are the Ch4 compostions in Biogas compositions vs Natural gas?

Natural Gas: 90-95% CH4 Biogas: 55-75% CH4 Thus Biogas is more environmentally friendly

What are the three stages in Landfill Leachate

Young: 1-5 yrs Moderate: 5-15 yrs Aged: 15-30 yrs

Second and third phase

acidification phase and acetogenic phase