Which practice best follows the waste-management principle of resource recovery?
Correct answer: C. Recovering metals from discarded electronic equipment
- A. Discharging untreated leachate to a river
- B. Burning mixed waste without energy capture
- C. Recovering metals from discarded electronic equipment
- D. Storing all waste permanently in open heaps
Explanation
Recovering metals from electronic waste returns useful materials to production and reduces the need for virgin resources. Uncontrolled burning and open dumping create pollution rather than recover resources safely.
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Environmental engineering examines water supply, water quality, treatment processes, wastewater collection and treatment, solid waste management, air pollution and public health protection. It covers sedimentation, coagulation, filtration, disinfection, biological treatment and disposal methods, while distinguishing drinking-water treatment from sewage treatment and BOD from COD.
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