Practice Quiz or MCQ (Multiple Choice Questions) with solutions are available for Practice, which would help you prepare for chapter Waste water Story, Class 7, Science. You can practice these practice quizzes as per your speed and improvise the topic.Q.Liquid waste from houses is calleda)Sludgeb)Effluentc)Smogd)SewageCorrect answer is option 'D'. Can you explain this answer?

Question

Answer

Sewage is wastewater released by homes, industries, hospitals, offices and other users. It also includes rainwater that has run down the street during a storm or heavy rain. The water that washes off roads and rooftops carries harmful substances with it. Sewage is a liquid waste. Most of it is water, which has dissolved and suspended impurities.

Answer

Sewage

Sewage refers to the liquid waste produced by households, industries and commercial establishments. It is a mixture of domestic wastes, human excreta, soaps, detergents, food wastes, oils, grease, chemicals, and other pollutants that are carried away from homes and buildings through a system of pipes and drains.

Composition of Sewage

The composition of sewage varies depending on the source and the treatment processes involved. However, the most common components of sewage include:

1. Organic matter: This includes human and animal excreta, food waste, and other biodegradable materials.

2. Suspended solids: These are small particles of organic and inorganic matter that are carried in the water.

3. Nutrients: Sewage contains nitrogen, phosphorus, and other nutrients that can promote the growth of algae and other aquatic plants.

4. Pathogens: These are microorganisms that can cause diseases in humans and animals.

Treatment of Sewage

Sewage treatment involves a series of processes designed to remove the pollutants from the wastewater before it is discharged into the environment. The treatment processes include:

1. Primary treatment: This involves the physical removal of solids and other suspended materials from the wastewater.

2. Secondary treatment: This involves the biological treatment of the wastewater to remove organic matter and other pollutants.

3. Tertiary treatment: This involves the removal of nutrients and other contaminants that were not removed during the primary and secondary treatment processes.

Disposal of Sewage

The disposal of sewage can have significant environmental and public health impacts. If sewage is not treated properly, it can contaminate water sources, cause the spread of diseases, and harm aquatic life. Therefore, it is important to ensure that sewage is properly treated and disposed of in a way that protects the environment and public health.

Answer

Liquid waste from houses is called sewage.

Sewage is the term used to describe the wastewater or liquid waste that is produced by households, commercial properties, and industries. It includes everything from human waste to soapy water and everything in between. Sewage is transported through a system of pipes and pumps to a treatment plant where it is cleaned and purified before being released back into the environment.

Importance of Sewage Treatment
Sewage treatment is essential for protecting public health and the environment. Untreated sewage can contain harmful bacteria, viruses, and other contaminants that can make people sick. It can also pollute streams, lakes, and rivers, killing fish and other aquatic life. By treating sewage, we can remove these harmful contaminants and prevent them from entering our waterways.

Sewage Treatment Process
The sewage treatment process typically involves several stages, including:

1. Screening and Grit Removal: The first step is to remove any large objects and grit that may damage equipment or interfere with the treatment process.

2. Primary Treatment: During primary treatment, the sewage is settled in large tanks, allowing solids to settle to the bottom while oils and grease float to the top. This process removes about 60% of the solids and organic matter from the sewage.

3. Secondary Treatment: Secondary treatment involves biological processes that use bacteria to break down organic matter and remove nutrients like nitrogen and phosphorus. This process can remove up to 90% of the organic matter from the sewage.

4. Tertiary Treatment: Tertiary treatment is an optional process that further purifies the sewage by removing any remaining contaminants. This can include processes like filtration, disinfection, and chemical treatment.

Conclusion
In conclusion, sewage is the liquid waste produced by households, commercial properties, and industries. It is transported through a system of pipes and pumps to a treatment plant where it is cleaned and purified before being released back into the environment. Sewage treatment is essential for protecting public health and the environment. The sewage treatment process involves several stages, including screening and grit removal, primary treatment, secondary treatment, and tertiary treatment.

Answer

Sewage

Answer

because it is an excrement of waste water from houses.

Answer

sewage is the waste water or material .it is none biogradable

Answer

Sewage is correct answer

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