A mature compost is generally identified by its:
Correct answer: C. Dark, stable appearance and earthy odour
- A. Strong ammonia odour and high temperature
- B. High content of fresh food scraps
- C. Dark, stable appearance and earthy odour
- D. Rapid production of foul-smelling gases
Explanation
Mature compost is relatively stable, dark and soil-like, with an earthy odour and little further heat generation. Strong ammonia odour and high temperature indicate active or incomplete decomposition rather than maturity.
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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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