Question

Explain three phases by which treatment of industrial effluents can be done?

Answer 1

Answer:

The three phases are:

(i) Primary treatment by mechanical machines. This involves screening, grinding,flocculation and sedimentation.

(ii) Secondary treatment by biological process by add bacteria etc

(iii) Tertiary treatment by biological, chemical and physical processes. This involves recycling of waste water.

Answer 2

The techniques include automated refining of oxidation, distillation, ozonation, adsorption, vitrification, incineration, chemical immobilisation or disposal of landfills.

Explanation:

The three stages are

• Electrical equipment main care. It involves sampling, scraping, sedimentation and flocculation.
• Microbial secondary treatment by introducing bacteria etc.
• Thertiary treatment through biochemical, chemical and physical processes. Which requires wastewater recycling.

Few products, such as some detergents, may be susceptible of biological deterioration and a different type of wastewater treatment must be required in such situations.

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