Wastewater Story - Chapter 18: Class 7 Science NCERT Book (PDF)

Chapter 18 (Wastewater Story) of Class 7 Science NCERT Book (PDF) is available here for download in PDF format. Download now and prepare for CBSE Class 7th Science exam.

Created On: Jul 19, 2021 18:16 IST
NCERT
NCERT

Chapter 18 (Wastewater Story) of Class 7 Science NCERT Book (PDF) is available here for download in PDF format. Download now & prepare for CBSE Class 7 Science exam in academic session 2021-22. It is one of the most important chapters of the CBSE Class 7th Science NCERT textbook & many essential questions are framed from this chapter.

Download NCERT Book Class 7 Science (PDF) Chapter 18 - Wastewater Story

Snapshot from Chapter 18 of Class 7 Science NCERT Textbook:  

Important topics of this chapter:

⇒ Aerobic bacteria

⇒ Anaerobic bacteria

⇒ Biogas

⇒ Contaminant

⇒ Sanitation

⇒ Sewage

⇒ Sewer

⇒ Sewerage

⇒ Sludge

⇒ Wastewater

⇒ Aeration

Important points of this chapter:

⇒ Used water is wastewater. Wastewater could be reused.

⇒ Wastewater is generated in homes, industries, agricultural fields and in other human activities. This is called sewage.

⇒ Sewage is a liquid waste which causes water and soil pollution.

⇒ Wastewater is treated in a sewage treatment plant.

⇒ Treatment plants reduce pollutants in wastewater to a level where nature can take care of it.

Where underground sewerage systems and refuse disposal systems are not available, the low cost on-site sanitation system can be adopted.

⇒ By-products of wastewater treatment are sludge and biogas.

⇒ Open drain system is a breeding place for flies, mosquitoes and organisms which cause diseases.

⇒ We should not defecate in the open. It is possible to have safe disposal of excreta by low cost methods

Download Chapter 18 - Wastewater Story (NCERT Book Class 7 Science)

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  • Jayant Pratap Singh 10 hours ago
    Now it has become very clear that the chinese are behind the fire incident at SII. It is high time we provide multi layered security to SII and weed out employees having a leftist ideology and pàkistan suppoters...
    Reply
  • Arjun Singh 10 hours ago
    Now it has become very clear that the chinese are behind the fire incident at SII. It is high time we provide multi layered security to SII and weed out employees having a leftist ideology and pàkistan suppoters...
    Reply
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    RP Singh 10 hours ago
    Now it has become very clear that the chinese are behind the fire incident at SII. It is high time we provide multi layered security to SII and weed out employees having a leftist ideology and pàkistan suppoters...
    Reply
    Pratap 10 hours ago
    Now it has become very clear that the chinese are behind the fire incident at SII. It is high time we provide multi layered security to SII and weed out employees having a leftist ideology and pàkistan suppoters...
    Reply
  • Jayant Pratap Singh 10 hours ago
    Now it has become very clear that the chinese are behind the fire incident at SII. It is high time we provide multi layered security to SII and weed out employees having a leftist ideology and pàkistan suppoters...
    Reply
  • Jayant Pratap Singh 10 hours ago
    Now it has become very clear that the chinese are behind the fire incident at SII. It is high time we provide multi layered security to SII and weed out employees having a leftist ideology and pàkistan suppoters...
    Reply
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