Biological Processes Flashcards

1
Q

Anaerobic decomposition

A

When organic matter decays under the absence of oxygen

End products include: CH4, CO2, NH3

issues: large land areas required, sludge does not dewater, production of hydrogen sulfide

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2
Q

Mesophilic Bacteria

A

Convert organic acids to methane, have very slow growth rates, 85-100F

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3
Q

Thermophilic Bacteria

A

Convert organic acids to methane, have very slow growth rates, 120-135F

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4
Q

Composting

A

Aerobic
end product is partially decomposed organic fraction
natural process, backyards, good soil conditioner

aerobic microorganisms extract energy from the organic matter through a series of exothermic reactions that break down the material into simpler materials

temperature increases, destroys most bacteria

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5
Q

Composting Organic Wastes

A

a passively aerated compost system consists of shredded and/or screened source-separated organic wastes placed in windrows

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6
Q

Composting MSW

A

very little use for compost that has glass, plastic, and potentially toxic materials

metals like Pb can present health concerns

odors are emitted

limited reduction in volume of waste

some feed stocks can be composted

agricultural wastes can be composted

sewage sludges are mixed with wood chips & compost

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