Waste Generation and Characterisation Questions and Answers

Q: If the wet weight of the waste was 102.2 kg and the dry weight is 81.4 kg, calculate the percent of moisture content of the waste :

The moisture content is 20.35%.Moisture content of solid waste is normally reported on a wet-weight basis: the water lost on drying as a percentage of the original wet weight.\[ \begin{aligned} M &= \frac{w - d}{w} \times 100 \\ &= \frac{102.2 - 81.4}{102.2} \times 100 \\ &= \frac{20.8}{102.2} \times 100 \approx 20.35\% \end{aligned} \]Dividing by the dry weight instead (the dry-basis formula) gives \(20.8/81.4 \approx 25.6\%\), close to the 25.22% option. 10.15% and 5.1% are roughly half and a quarter of the right value.

What is the estimated per capita solid waste generation in the small towns of India ?

A.0.1 kg
B.0.3 to 0.4 kg
C.0.5 kg
D.0.5 to 0.6 kg

Exam Year(s)

MH SET - 2020, SET Exam - 2020,

Answer: A

The estimated per capita solid waste generation in small towns is about 0.1 kg per day.

Indian estimates show that per capita municipal solid waste rises with town size and income: about 0.1 kg per person per day in small towns, rising to about 0.5 kg in the largest cities.

The higher figures of 0.3 to 0.6 kg belong to larger towns and cities, not to small towns.

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If the wet weight of the waste was 102.2 kg and the dry weight is 81.4 kg, calculate the percent of moisture content of the waste :

A.5.1%
B.10.15%
C.20.35%
D.25.22%

Exam Year(s)

MH SET - 2023, SET Exam - 2023,

Answer: C

The moisture content is 20.35%.

Moisture content of solid waste is normally reported on a wet-weight basis: the water lost on drying as a percentage of the original wet weight.

\[ \begin{aligned} M &= \frac{w - d}{w} \times 100 \\ &= \frac{102.2 - 81.4}{102.2} \times 100 \\ &= \frac{20.8}{102.2} \times 100 \approx 20.35\% \end{aligned} \]

Dividing by the dry weight instead (the dry-basis formula) gives \(20.8/81.4 \approx 25.6\%\), close to the 25.22% option. 10.15% and 5.1% are roughly half and a quarter of the right value.

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Waste Generation and Characterisation Questions and Answers

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