What is known to have the highest concentration of Sulfur in the waste stream?

• A. Gypsum Board
• B. Plasterboard
• C. Sulfuric soil
• D. Construction debris

Answer: (A)

Gypsum board, also known as drywall, is composed primarily of gypsum, which contains a significant amount of sulfur. The chemical formula for gypsum is CaSO₄·2H₂O, indicating that sulfur is an integral part of its structure. When gypsum board is disposed of, it contributes a high concentration of sulfur to the waste stream.

In contrast, while plasterboard and construction debris may also contain some sulfur, they typically do not have the same level of concentration as gypsum board, which is specifically designed from gypsum material. Sulfuric soil, while it may contain sulfur compounds, is not a direct comparison since it refers to soil types rather than a manufactured material that is disposed of as part of waste management practices. Hence, gypsum board is recognized as the material in this context that contributes the highest concentration of sulfur when included in the waste stream.