Question 40 (Textile Engineering & Fibre Science)
Determine the correctness or otherwise of the following Assertion [a] and the Reason [r]
Assertion : In effluent treatment, flocculation is used to precipitate out the organic impurities.
Reason : Flocculation involves use of moderately charged polyelectrolytes.
| (A) | Both [a] and [r] are false |
| (B) | Both [a] and [r] are true and [r] is the correct reason for [a] |
| (C) | Both [a] and [r] are true but [r] is not the correct reason for [a] |
| (D) | [a] is false but [r] us true |
[Show Answer]
D
Frequently Asked Questions | FAQs
What is effluent treatment in textile?
Effluent treatment is the process of treating the wastewater generated during textile manufacturing processes before it is discharged into the environment. The textile industry is known to generate significant amounts of wastewater, which contains a variety of pollutants including dyes, chemicals, and organic matter.
Effluent treatment is necessary to ensure that the wastewater is safe to discharge into the environment and does not cause harm to people or the ecosystem. The process typically involves several stages of treatment, including physical, chemical, and biological treatment methods.
Preliminary treatment: In this stage, large particles and debris are removed from the wastewater using screens and filters.
Physical treatment: In this stage, the wastewater is subjected to physical processes such as sedimentation, flocculation, and filtration to remove suspended solids, organic matter, and other impurities.
Chemical treatment: In this stage, chemicals such as coagulants and flocculants are added to the wastewater to facilitate the removal of suspended solids and other impurities.
Biological treatment: In this stage, microorganisms such as bacteria and fungi are used to break down organic matter in the wastewater, converting it into harmless substances such as carbon dioxide and water.
Advanced treatment: In some cases, additional treatment steps may be required to remove specific pollutants such as heavy metals or persistent organic pollutants.
Effluent treatment is an important aspect of sustainable textile manufacturing, as it helps to minimize the impact of textile production on the environment and protect the health and well-being of people and ecosystems. Many countries have regulations in place to ensure that textile manufacturers implement effective effluent treatment processes and meet strict discharge standards.
What is the flocculation process?
In the textile industry, flocculation is a process used in the treatment of wastewater generated during various textile manufacturing processes. The wastewater contains a variety of pollutants including dyes, chemicals, and organic matter, which need to be removed before the water can be safely discharged into the environment.
The flocculation process in textiles typically involves the following steps:
Coagulation: In this step, chemicals such as aluminum sulfate or ferric chloride are added to the wastewater to neutralize the electrical charges on suspended particles and to form small, sticky clumps called microflocs.
Flocculation: In this step, another chemical called a flocculant is added to the wastewater to promote the growth and formation of larger flocs from the microflocs formed in the coagulation step. The flocculant used in the textile industry is typically a long-chain polymer that adsorbs onto the surface of the microflocs, causing them to agglomerate and form larger flocs.
Settling: Once the flocs have formed, they are allowed to settle to the bottom of the wastewater under the influence of gravity. The settled flocs, or sludge, can then be removed from the wastewater by sedimentation or filtration.
Additional treatment: In some cases, additional treatment steps may be required to remove specific pollutants such as heavy metals or persistent organic pollutants.
Flocculation is an important process in the textile industry, as it helps to minimize the impact of textile production on the environment and protect the health and well-being of people and ecosystems. By removing pollutants from the wastewater, flocculation helps to ensure that the water can be safely discharged into the environment without causing harm.