The duration for which of the usable compost generation is 3−6 months?
Pit composting
The question concerns the time taken by different waste-composting methods to produce usable compost.
In pit composting, biodegradable waste is layered in a dug pit and left to decompose naturally through microbial action. Because it relies on slow, unaided natural decomposition, it typically takes about 3 to 6 months to yield usable compost.
Vermi composting uses earthworms to accelerate breakdown and usually gives compost in a shorter period (about 2 to 3 months). Automatic and semi-automatic waste converters are mechanized systems that use heating, grinding and controlled aeration to produce compost very rapidly, often within a single day to a few weeks, far faster than the 3−6 month range. Hence only the slow, natural pit method fits the stated duration.
Correct answer: Pit composting
Match List I with List II
| LIST I (Type of wastes) | LIST II (Example) |
|---|---|
| A. Toxic wastes | I. Acid |
| B. Reactive wastes | II. Hypodermic needle |
| C. Corrosive wastes | III. Nitroglycerine |
| D. Infectious wastes | IV. Pesticide |
Choose the correct answer from the options given below:
What is the correct sequence of processes involved in particle removal from largest to smallest in waste water treatment?
A. Sedimentation
B. Flocculation
C. Screening
Choose the correct answer from the options given below:
Given below are two statements :
Statement I : Municipal solid waste includes Garbage and Rubbish.
Statement II : Garbage consists of both combustible and non combustible materials.
In the light of the above statements, choose the most appropriate answer from the options given below :
Which of the following sequences of disposal options for low hazardous solid waste from industrial and urban sources is in order of increasing desirability?
Following are two sets of items. Set-I lists different types of washes, while Set-II indicates method of their disposal. Match the two sets and given your answer from the code given below:<
| Set-I (Types of Waste) | Set-II (Metdods of Disposal) |
| (a) Dry Waste | (iv) By recycling |
| (b) Wet Waste | (i) By composting |
| (c) Toxic Waste | (ii) By burying in landfills |
| (d) Soiled Waste | (iii) By dropping tdem in corporation bins. |
Define e-waste.
Given below are two statements
Statement I:-
Aerobic digestion of sewage sludge requires lots of energy
Statement II:-
Aerobic digestion of sewage sludge produces huge amount of methane
In light of the above statements, choose the correct answer from the options given below
During waste water treatment, large objects like plastic bottles, plastics, and cans are removed by:
Which of the following is likely a characteristic of hazardous waste?
Arrange the following components of municipal solid waste in order of their increasing abundance.
A. Paper and Cardboard
B. Food
C. Tin Cans
D. Dirt and Ash
E. Textiles
Choose the correct answer from the options given below: