Sludge Treatment and Disposal in Chemical Engineering

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What is the primary reason for treating sludge?

To decrease the water content

To reduce the aesthetic displeasure

To eliminate potentially harmful elements (correct)

To improve the organic material content

What percentage of solids does trickling filter sludge typically contain?

70%

3-8%

90%

2-5% (correct)

What is the main advantage of sludge thickening?

Reducing the water content to 1%

Substantially reducing the sludge volume (correct)

Changing the organic material content

Decreasing the sludge volume to a solid state

What is the characteristic of tertiary sludge if a secondary clarifier is used to remove phosphate?

Contains chemical precipitates Signup and view all the answers

What percentage reduction in volume can be achieved when sludge with 1% solids is thickened to 5%?

80% Signup and view all the answers

What is the maximum achievable solids concentration in gravity thickening?

10% Signup and view all the answers

Which method is primarily used to thicken the solids in chemical and waste activated sludges?

Dissolved air flotation (DAF) Signup and view all the answers

What is the main advantage of dissolved air flotation (DAF) according to the text?

Minimal space requirements Signup and view all the answers

What is the typical increase in solids content achieved by flotation for activated sludge?

36-38% Signup and view all the answers

Which type of sludge is difficult to thicken under gravity according to the text?

Waste activated sludge (WAS) Signup and view all the answers

Sludge Treatment and Disposal in Chemical Engineering

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Questions and Answers

What is the primary reason for treating sludge?

What percentage of solids does trickling filter sludge typically contain?

What is the main advantage of sludge thickening?

What is the characteristic of tertiary sludge if a secondary clarifier is used to remove phosphate?

What percentage reduction in volume can be achieved when sludge with 1% solids is thickened to 5%?

What is the maximum achievable solids concentration in gravity thickening?

Which method is primarily used to thicken the solids in chemical and waste activated sludges?

What is the main advantage of dissolved air flotation (DAF) according to the text?

What is the typical increase in solids content achieved by flotation for activated sludge?

Which type of sludge is difficult to thicken under gravity according to the text?

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