Chapter 20: Problem 7

Name and describe three methods of treating raw sludge, and give the end product(s) that may be produced from each method.

Short Answer

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Three raw sludge treatment methods include Anaerobic Digestion that yields biogas and soil conditioner, Aerobic Digestion which results in carbon dioxide, water, and new bacterial cells, and Composting that produces beneficial soil amendment.

Step by step solution

Method 1: Anaerobic Digestion

Anaerobic digestion involves the breakdown of raw sludge by bacteria in an oxygen-free environment. During anaerobic digestion, the complex organic materials found in sludge are decomposed to produce biogas, a combination of methane and carbon dioxide. Remaining sludge can be used as soil conditioner.

Method 2: Aerobic Digestion

In aerobic digestion, breakdown of raw sludge occurs by bacteria in the presence of oxygen. Bacteria metabolize organic compounds in the sludge, converting them into carbon dioxide, water, and new bacterial cells. Solid end products, called biosolids, are used for land application or disposed in landfills.

Method 3: Composting

Composting is another method that involves the breakdown of organic matter in the sludge by microorganisms in the presence of oxygen. The high temperatures generated during composting help to reduce pathogens. The end product of composting is compost, which is beneficial soil amendment.

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Name and describe three methods of treating raw sludge, and give the end product(s) that may be produced from each method.

Short Answer

Step by step solution

Method 1: Anaerobic Digestion

Method 2: Aerobic Digestion

Method 3: Composting

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