Solid Waste Compaction Ratio Definition

The compaction ratio in solid waste management measures the effectiveness of compaction in reducing waste volume.

Understanding the Ratio

Compaction aims to increase the density of solid waste by reducing its volume. Therefore, the compaction ratio is defined as the ratio of the waste's density after compaction to its original density before compaction.

• As-compacted density: The density of the waste after undergoing the compaction process.
• As-discarded density: The original density of the waste as it is typically thrown away, before compaction.

Formula for Compaction Ratio

The formula is expressed as:

$ \text{Compaction Ratio} = \frac{\text{As-compacted Density}}{\text{As-discarded Density}} $

Reasoning

A compaction ratio greater than 1 indicates that the waste density has increased due to compaction, meaning the volume has been reduced. Option A correctly represents this relationship.

• Option 1 (Correct): Accurately defines the ratio as the measure of increased density after compaction compared to the initial density.
• Option 2: Represents the inverse, indicating volume increase, which contradicts the purpose of compaction.
• Options 3 & 4: Use "as-deposited density," which is less precise than "as-discarded density" and also potentially reverses the correct ratio.

Therefore, the correct definition involves comparing the higher, compacted density to the lower, original discarded density.