E-Waste Management | CBSE Class 11 | Computer Science
Dear Class 11th STUDENTS, ! Welcome to this tutorial of Digital Footprints from your CBSE class 11 of Computer Science Syllabus .
In this tutorial, we shall be learning our chapter-1: Digital Footprints from Unit 3: Society, Law and Ethics (SLE-1)- Cyber safety as CBSE BOARD suggested to learn about computer system and its organisation to complete this section.
Unit 3: Society, Law and Ethics (SLE-1)- Cyber safety
Chapter 1 : Digital Footprints
I advice you to check the latest syllabus given by CBSE Board at its Official website: www.cbseacademic.nic.in
Also, in this tutorial we will covers all necessary topics/concepts required to complete your exams preparations in CBSE classes 11th.
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E – waste Management
Electronic waste, e-scrap, or waste Electrical and Electronic Equipment (WEEE) describes discarded electrical or electronic devices. “Electronic waste” may also be defined as discarded computers, office electronic equipment, entertainment device electronics, mobile phones, television sets and refrigerators. This includes used electronics which are destined for reuse, resale, salvage, recycling, or disposal of all the different types of waste, electronic waste has the characteristics of:
(a) the fastest growing segment of waste
(b) most valuable due to its basic composition
(c) very hazardous if not handled carefully
Waste Disposal Process
E-Waste is categorized by the government of India under the broad class of hazardous waste. Within e-waste, there are several categories such as large and small household appliances, electrical and electronic toys and sporting equipment, tools, computers and related equipment and so forth.
Composition of e-waste: Electrical and Electronic equipment contains metallic and non metallic elements, alloys and compounds such as Copper, Aluminum, Gold, Silver, Palladium, Platinum, Nickel, Tin, Lead, Iron, Sulphur, Phosphorous, Arsenic etc.
The E- waste management involves proper recycling and recovery of the disposed material. The recycle and recovery includes the following unit operations.
Dismantling:
Removal of parts containing dangerous substances (CFCs, Hg switches, PCB); removal of easily accessible parts containing valuable substances (cable containing copper, steel, iron, precious, metal containing parts).
Segregation of ferrous metal, non-ferrous metal and plastic:
This separation is normally done in a shredder process.
Refurbishment and reuse:
Refurbishment and reuse of e-waste has potential for those used electrical and electronic equipments which can be easily refurbished to put to its original use.
Recycling/recovery of valuable materials:
Ferrous metals in electrical are furnaces, non-ferrous metals in smelting plants, precious metals in separating works.
Treatment/disposal of dangerous materials and waste:
Shredder light fraction is disposed off in landfill sites or sometimes incinerated (expensive), chlorofluoro-carbons (CFCs) are treated thermally, printed circuit Board (PCB) is incinerated or disposed off in underground storages, Mercury (Hg) is often recycled or disposed off in underground landfill sites.
benefits of e-Waste Recycling
The e-Waste disposal and proper recycling is very much necessary and important for the benefit of people, environment and the nation. The key benefits are:
Allows for recovery of valuable precious metals: Most consumer electronics contain valuable materials like copper, gold and zinc that can should be recycled. Virgin Materials are significantly more costly than recycled materials for manufacturing.
Protects public health and water quality: E-waste contains a variety of toxic substances, which may include lead, mercury and cadmium. When e-waste is disposed into landfills, these toxins can be released into the atmosphere or leak in through the land and have negative health and environmental effects.
Creates jobs: Recycling e-waste domestically creates jobs for professional recyclers and refurbishes and creates new markets for the valuable components that are dismantled.
Toxic Waste: Mining produces toxic waste, which are linked with crop devastation and human health crisis due to water contamination.
Saves landfill space: E-waste is a growing waste stream. Recycling these items will help conserve landfill space.
