Environmental impacts are the effects that engineered materials, energy systems, and manufacturing processes have on our natural surroundings. In the exam, you need to evaluate the benefits and drawbacks of different technologies, explain material lifecycles, and describe safe workshop waste disposal.
Material Selection and Product Lifecycles
Every engineered item affects the environment during its extraction, manufacturing, use, and final disposal. We call these stages the product lifecycle.
- Extracting metal ores and drilling crude oil takes large amounts of energy and damages natural habitats.
- Selecting durable materials that can be repaired or recycled keeps products out of landfill for longer.
- Collect swarf (small metal chips) and offcuts in scrap bins so the metal can be recycled.
- Designing products that unscrew easily makes maintenance and recycling at end of life much simpler.
Engineers follow three clear steps to lessen this impact: reduce material use, reuse standard parts, and recycle scrap.
Workshop Fluids and Pollution Control
Mechanisms like chain and sprocket drives need regular oil or grease to stop metal parts grinding together. Getting rid of these fluids carelessly causes severe pollution.
- Discarding used oil down workshop sinks or road drains can contaminate waterways and harm aquatic life.
- Pouring lubricants onto open soil can contaminate soil and harm plants.
- Collect all waste oils, greases, and coolants in sealed drums for specialist chemical processing.
- Environmental engineering focuses on building facilities like wastewater treatment plants to remove pollutants before water returns to rivers.
Energy Technologies in Transport and Power
Engineers develop cleaner power systems to cut emissions and lower our reliance on fossil fuels.
| Technology | Positive Environmental Impact | Negative Environmental Impact |
|---|---|---|
| Petrol or Diesel Engine | None | Burns fossil fuels and emits carbon dioxide and toxic exhaust fumes |
| Electric Vehicle (EV) | Zero tailpipe emissions while driving | Mining battery minerals uses heavy machinery and damages local environments |
| Wind Turbine | Generates clean electricity without burning fuel | Can disrupt local bird habitats and creates mechanical noise |
A petrol car gives good range and convenience, but those are practical benefits rather than environmental ones.
Mechatronics, Automation, and E-Waste
Mechatronics brings together mechanical components, circuits, and computer control to run machines with high precision.
- Motion sensors and microcontrollers switch off lights and heaters in empty rooms to prevent energy waste.
- Automated factory robots handle hazardous tasks like spray-painting and welding, keeping human workers safe from toxic fumes.
- Automating production lines can displace factory workers, so engineers must weigh social effects alongside factory output.
- Discarded printed circuit boards form electronic waste (e-waste). Some components contain harmful substances that can contaminate soil and water if disposed of incorrectly.
Key terms
- Sustainability
- Meeting our needs today without stopping future generations from meeting their own needs.
- Lifecycle
- The complete journey of a product from raw material extraction to manufacturing, use, and disposal.
- Contamination
- The pollution of land, water, or air caused by hazardous chemicals or improper waste disposal.
- Environmental engineering
- The engineering discipline that designs systems to control pollution and safeguard air, water, and soil.
- Renewable energy
- An energy source that replenishes naturally and will not run out, such as wind or solar power.
- Non-renewable energy
- A finite energy source that depletes permanently as it is used, such as coal, petrol, or gas.
- Mechatronics
- The combination of mechanical parts, electronics, and software to build automated systems.
- E-waste
- Discarded electrical or electronic equipment.
Check yourself
What three steps help engineers minimise a product's lifecycle impact?
Reduce material and energy use, reuse components, and recycle materials at end of life.
Name two distinct environmental problems caused by dumping machine oil outside.
Contamination of land and contamination of waterways.
What is one environmental drawback of wind turbines?
They can disrupt bird habitats and create noise disturbance.
Why is e-waste a serious environmental concern when thrown into landfill?
Some components contain harmful substances that can contaminate soil and water if disposed of incorrectly.