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Chapter 18: Problem 46

What properties make a substance a good coagulant for water purification?

Short Answer

Expert verified
A good coagulant for water purification should possess properties such as effective removal of contaminants, fast action, low dosage requirement, non-toxicity, environmental friendliness, and affordability. These properties ensure efficient water treatment with minimal negative impacts on human health and the environment.

Step by step solution

01

Understand coagulation in water purification

A coagulant is a chemical substance that plays a significant role in water purification. It helps in the removal of contaminants, particularly suspended particles and turbidity. Coagulation is a process in which a coagulant forms an insoluble substance by causing particles to clump together in a larger mass. These larger masses can then be separated from the water through filtration or sedimentation.
02

Effective removal of contaminants

A good coagulant should effectively and efficiently remove a wide range of contaminants, including colloidal and suspended particles, dissolved organic matter, and microorganisms. The coagulant should be able to form a large, stable floc that can easily be separated from the water.
03

Fast-acting

A suitable coagulant should be fast-acting, ensuring rapid coagulation and floc formation. This property helps in reducing the treatment time, making the process more efficient and cost-effective.
04

Low dosage requirement

A good coagulant should require low dosages to achieve the desired level of purification. Lower dosages will result in less residual chemicals in the treated water, which ultimately leads to a safer and better tasting water supply.
05

Non-toxic and environmentally friendly

A suitable coagulant should not have any adverse effects on human health or the environment. It should be non-toxic and should not introduce any harmful byproducts into the treated water. It should also be biodegradable and environmentally friendly.
06

Economic factors

The cost of a coagulant is an essential factor to consider, as it affects the overall cost of water treatment. A good coagulant should be readily available and affordable. In summary, a good coagulant for water purification should be effective in removing contaminants, fast-acting, require low dosages, be non-toxic and environmentally friendly, and affordable.

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