NCERT Solutions for Class 7 Science Chapter 18 - Free PDF Download
NCERT Science Chapter 18 Class 7 is a credible source of reference that offers students a brief comprehension of Wastewater Story interestingly and easily. NCERT Solution provide a comprehensive overview of the study sources, inclusive of all the important concepts and topics. Students preparing or revising for their annual examination or intermediate tests should access the NCERT Science Book Class 7 Chapter 18 to comprehend the chapter and gain a concise understanding of all the essential concepts. Students can access the NCERT Class 7 Science Chapter 18 from here and improve their preparation. You can also download NCERT Solutions for Class 7 Maths to help you to revise complete syllabus and score more marks in your examinations.
What You Will Learn in Class 7 Science Chapter 18 - Wastewater Story?
The following are some of the important points that are discussed throughout the chapter.
Wastewater is defined as the water that has been contaminated by numerous sources and cannot be utilised until it has been properly treated. All discharge from a household, hospitals, commercial organisations and institutions, industries, and so on is referred to as effluent.
Agricultural, horticultural, stormwater and urban runoff, and aquaculture effluent are all included in wastewater.
Effluent refers to sludge or sewage that is released into bodies of water, either directly or through treatment processes.
Contamination is a substance that contaminates another substance, such as bacteria contaminate food or water.
Sewage is a liquid waste that pollutes the water and soil. It's made up of a complex mix of suspended materials, organic and inorganic pollutants, nutrients, saprophytic and disease-causing bacteria, and other microbes.
Wastewater treatment plants remove contaminants in wastewater to a level that the environment can sustain.
The low-cost on-site sanitation system is an alternative waste treatment method that can be used where underground sewerage and trash disposal systems are not accessible.
Sludge and biogas are by-products of wastewater treatment.
We should not defecate in the open drain system since it is a breeding ground for flies, mosquitoes, and disease-causing organisms.
Excreta can be safely disposed of in low-cost ways which is particularly important for the rural areas and the developing countries.
FAQs on Wastewater Story NCERT Solutions - Class 7 Science
1. Define Sludge and Explain its Treatment.
Sludge is a solid waste, which is a result of secondary treatment of Water. The by-product is generally scrapped from the bottom of the Wastewater Treatment Plant using a skimmer and is subjected to clarified Water to lather the product. The Sludge is generally transferred to a tank and undergoes a slow decomposition process with the help of the anaerobic bacteria to produce Biogas. Biogas is usually known as an activated Sludge and you’ll often find it useful as Bio-Manure.
2. What is the Connection Between Sanitation and Disease?
Sanitation is a condition that defines public health and to remain free of diseases. It is necessary to adopt clean and proper methods of disposal of waste and sewage. Sanitation is also inclusive of clean drinking water. The cause of the disease is in an environment that lacks Sanitation. Dirty and stagnant Water is a thriving place for organisms, flies, and mosquitoes, and improper disposal of wastewater and sewage leads to water-borne diseases. Therefore, Sanitation is the ultimate tool that helps make the environment disease-free.
3. How many questions are present in NCERT Solutions For Class 7 Science Chapter 18 Wastewater Story.
There are 12 questions in the NCERT Solutions for Class 7 Science Chapter 18 Wastewater Story. NCERT Solutions provides students with reliable and genuine materials to help them comprehend, analyse, and respond to problems effectively. NCERT Solution for Class 7 Science Chapter 18 provides students with a quick overview of the chapter and succinct answers to problems. NCERT Solutions for Class 7 Science Chapter 18 PDF is simple and easy-to-understand and covers all of the important ideas and subjects.
4. How many questions have long solutions(more than 180 words) in NCERT Solutions for Class 7 Science Chapter 18 Wastewater story?
Class 7 NCERT Chapter 18 The Wastewater Story, its by-products, sewage, and the function of safe disposal techniques are all part of the science. The emphasis in Science Class 7 Chapter 18 is on short and lengthy responses. In the intermediate exams or yearly examinations, the Chapter Wastewater Story is worth 4 or 8 points. Class 7 Science Chapter 18 Solution includes all of the chapter's significant problems from the NCERT textbook.
5. What is wastewater according to Chapter 18 of Class 7 Science?
Chapter 18 of NCERT Solutions for Class 7 Science focuses on pollutants' concerns with natural resource water and its grave effects. It discusses how pollution is created and how it affects people's health. The conversion of wastewater created by human activities, which results in soil and water contamination, is also covered in this chapter. The construction of a wastewater treatment plant to minimise pollution levels in the environment. Adoption and installation of low-cost on-site sanitation solutions to replace sewage systems that are unavailable. The Wastewater Treatment Plant's by-products, on the other hand, include Biogas and Sludges.
6. What is sludge? Explain how it is treated
Physical, chemical, and biological procedures are used in wastewater treatment to eliminate contaminating physical, chemical, and biological materials. Water passes through bar screens before being sent to a grit and sand treatment tank. After that, the water is allowed to settle in a huge tank with a sloping centre. Solids, such as faeces, settle in the bottom and must be scraped away with a scraper. The sludge is this. A skimmer is used to remove floatable materials such as oil and grease. Clarified water is a term used to describe water that has been cleansed of impurities. The sludge is transported to a separate tank where anaerobic microorganisms break it down. The biogas generated during the process can be utilised as a fuel or to generate power.
7. Where can I find the PDF of NCERT Solutions of Chapter 18 of Class 7 Science?
You can find the PDF of NCERT Solutions of Chapter 18 of Class 7 Science free of cost on Vedantu website and app. NCERT Solutions provides students with reliable and genuine materials to help them comprehend, analyse, and respond to problems effectively. NCERT Solution for Chapter 18 of Class 7 Science is a very efficient way to kickstart your preparation and the PDF version makes it all the more convenient. It will help you organise your notes better and also amp up your understanding.