Class 7 Exam > Class 7 Questions > What is sludge? how it is treated.a)Liquid wa...
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What is sludge? how it is treated.
- a)Liquid waste; by filtration
- b)Solid waste; by incineration
- c)Semi-solid waste; by anaerobic digestion
- d)Chemical waste; by neutralization
Correct answer is option 'C'. Can you explain this answer?
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What is sludge? how it is treated.a)Liquid waste; by filtrationb)Solid...
Sludge is a semi-solid byproduct that is produced during wastewater treatment processes. It is composed of both organic and inorganic materials that settle out during sedimentation, often containing a mixture of water, microorganisms, and solid waste materials.
Treatment of Sludge:
The most common method for treating sludge is anaerobic digestion. Here’s how the process works:
- Anaerobic Digestion:
- In this process, sludge is placed in a sealed container known as an anaerobic digester, where bacteria break down the organic material in the absence of oxygen.
- The digestion process produces biogas (methane and carbon dioxide) as a byproduct, which can be captured and used for energy generation.
- Anaerobic digestion reduces the volume of sludge, stabilizes it, and reduces odors. The end product is a digested sludge, which can sometimes be further treated for use as fertilizer.
This method is preferred because it reduces the volume of waste, produces useful byproducts like biogas, and minimizes environmental impacts.
Other Methods of Treatment:
- Dewatering: Sludge is often dewatered to reduce its water content, making it easier to handle and transport.
- Incineration: Sometimes, dried sludge is burned to reduce its volume, though this can be energy-intensive and release pollutants if not controlled properly.
- Composting: In some cases, treated sludge can be composted to be used as a soil conditioner.
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What is sludge? how it is treated.a)Liquid waste; by filtrationb)Solid...
What is Sludge?
Sludge is a semi-solid waste material that is typically a byproduct of various industrial processes, wastewater treatment, and sewage treatment. It consists of organic and inorganic solids that settle out from liquids during treatment processes.
Characteristics of Sludge
- Composition: Sludge contains a mixture of water, microorganisms, and suspended solids, making it thick and gooey.
- Sources: It can originate from sewage treatment plants, industrial processes, or even stormwater runoff.
Treatment of Sludge
The treatment of sludge is crucial to minimize environmental impact and recover useful resources. One of the most effective methods is anaerobic digestion.
What is Anaerobic Digestion?
- Process: This is a biological process that breaks down organic matter in the absence of oxygen.
- Microorganisms: Specific bacteria work to decompose the sludge, producing biogas (which can be captured and used for energy) and digestate (which can be used as fertilizer).
Benefits of Anaerobic Digestion
- Energy Production: The biogas generated can be used to produce electricity or heat.
- Reduced Volume: The process significantly reduces the volume of sludge, making it easier to manage.
- Nutrient Recovery: The remaining digestate is rich in nutrients and can be used to enrich soil.
In summary, the correct answer is option 'C' because sludge is a semi-solid waste that undergoes treatment through anaerobic digestion, effectively converting waste into useful energy and reducing environmental impact.
Sludge is a semi-solid waste material that is typically a byproduct of various industrial processes, wastewater treatment, and sewage treatment. It consists of organic and inorganic solids that settle out from liquids during treatment processes.
Characteristics of Sludge
- Composition: Sludge contains a mixture of water, microorganisms, and suspended solids, making it thick and gooey.
- Sources: It can originate from sewage treatment plants, industrial processes, or even stormwater runoff.
Treatment of Sludge
The treatment of sludge is crucial to minimize environmental impact and recover useful resources. One of the most effective methods is anaerobic digestion.
What is Anaerobic Digestion?
- Process: This is a biological process that breaks down organic matter in the absence of oxygen.
- Microorganisms: Specific bacteria work to decompose the sludge, producing biogas (which can be captured and used for energy) and digestate (which can be used as fertilizer).
Benefits of Anaerobic Digestion
- Energy Production: The biogas generated can be used to produce electricity or heat.
- Reduced Volume: The process significantly reduces the volume of sludge, making it easier to manage.
- Nutrient Recovery: The remaining digestate is rich in nutrients and can be used to enrich soil.
In summary, the correct answer is option 'C' because sludge is a semi-solid waste that undergoes treatment through anaerobic digestion, effectively converting waste into useful energy and reducing environmental impact.
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What is sludge? how it is treated.a)Liquid waste; by filtrationb)Solid waste; by incinerationc)Semi-solid waste; by anaerobic digestiond)Chemical waste; by neutralizationCorrect answer is option 'C'. Can you explain this answer?
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What is sludge? how it is treated.a)Liquid waste; by filtrationb)Solid waste; by incinerationc)Semi-solid waste; by anaerobic digestiond)Chemical waste; by neutralizationCorrect answer is option 'C'. Can you explain this answer? for Class 7 2024 is part of Class 7 preparation. The Question and answers have been prepared according to the Class 7 exam syllabus. Information about What is sludge? how it is treated.a)Liquid waste; by filtrationb)Solid waste; by incinerationc)Semi-solid waste; by anaerobic digestiond)Chemical waste; by neutralizationCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 7 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What is sludge? how it is treated.a)Liquid waste; by filtrationb)Solid waste; by incinerationc)Semi-solid waste; by anaerobic digestiond)Chemical waste; by neutralizationCorrect answer is option 'C'. Can you explain this answer?.
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