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Delignification Process in Wood Treatment

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Delignification Process in Wood Treatment

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Questions and Answers

What is the primary purpose of delignification in the wood?

To remove the lignin from the wood (correct)

To increase the roughness of the wood surface

To bleach the wood white

To glue the wood fibres together

What is the main cause of the deterioration of the wood when the chlorine residual is above 1 mg/L and the pH is above 8.0?

Crevice corrosion

Stress corrosion cracking

Microbiological corrosion

Chemical attack (correct)

Which of the following is NOT a type of corrosion mentioned in the text?

Galvanic corrosion (correct)

Crevice corrosion

Pitting corrosion

Stress corrosion cracking

What is the main cause of microbiological corrosion in the cooling system?

All of the above Signup and view all the answers

Where is delignification most prevalent in the cooling tower?

In the wetted areas of the tower Signup and view all the answers

How can delignification be controlled in the cooling tower?

By accurate control of pH levels and chlorine residuals Signup and view all the answers

What is the purpose of using oxidizing agents like chlorine and microbicides in cooling water systems?

To control microbiological activity Signup and view all the answers

In a once-through cooling water system, what happens to the water after it passes through the plant?

It is discharged back into the original source Signup and view all the answers

What is the advantage of using closed recirculating cooling water systems?

They allow for better temperature control and lower chemical requirements Signup and view all the answers

In open recirculating cooling water systems, what is the purpose of blowdown?

To control the concentration of minerals in the water Signup and view all the answers

Which type of cooling water system is commonly used in power and process plants?

Open recirculating systems Signup and view all the answers

What is the advantage of using evaporative cooling in open recirculating cooling water systems?

It reduces the requirement for water makeup Signup and view all the answers