Non-biodegradable industrial waste that can be utilized by cement industry is

Options

A. Fly ash
B. Slag
C. Gypsum
D. Both (1) & (2)

Answer

To solve the question regarding non-biodegradable industrial waste that can be utilized by the cement industry, we will analyze the options provided.

### Step-by-Step Solution:

1. **Understanding Non-Biodegradable Waste**:
- Non-biodegradable waste refers to materials that do not decompose naturally and can persist in the environment for a long time.

2. **Analyzing the Options**:
- **Option A: Fly Ash**:
- Fly ash is a by-product from coal-fired power plants. It is lightweight and can be mixed with cement to enhance its properties. Fly ash is indeed non-biodegradable and is commonly used in the cement industry.

- **Option B: Slag**:
- Slag is a by-product from the production of iron and steel. It is also non-biodegradable and is used in cement production to improve strength and durability.

- **Option C: Gypsum**:
- Gypsum is a mineral used in cement to control the setting time. However, it is not classified as industrial waste; rather, it is a natural mineral that is biodegradable in some contexts.

3. **Conclusion**:
- Both fly ash and slag are non-biodegradable industrial wastes that can be utilized in the cement industry. Gypsum, while important for cement, does not fit the category of non-biodegradable industrial waste.
- Therefore, the correct answer is **Option D: Both A and B** (Fly Ash and Slag).

### Final Answer:
The non-biodegradable industrial waste that can be utilized by the cement industry is **both fly ash and slag**.

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