Heavy metals like nickel can be removed from water with the help of

Options

A. Filtration
B. Carbomethylchitosan
C. Biological treatment
D. Ultrafiltration

Answer

**Step-by-Step Solution:**

1. **Understanding the Problem:**
- The question asks how heavy metals like nickel can be removed from water. Heavy metals are a significant environmental concern, and their removal from wastewater is crucial for pollution control.

2. **Analyzing the Options:**
- The options provided are:
- Filtration
- Carbo, methyl, chitosan
- Biological treatment
- Ultrafiltration
- We need to evaluate which of these methods is effective for removing heavy metals.

3. **Evaluating Biological Treatment:**
- Biological treatment involves the use of microorganisms (microbes) to remove contaminants from water.
- Microorganisms can absorb heavy metals through a process called biosorption, where ions from the solution phase are transferred to the cellular phase of the microbes.

4. **Understanding Biosorption:**
- In biosorption, the microbes act under anaerobic conditions and effectively capture heavy metals like nickel from the water.
- This method is effective because it utilizes the natural capabilities of microorganisms to bind and remove heavy metals from wastewater.

5. **Considering Other Options:**
- **Filtration and Ultrafiltration:** While these methods can remove particulates from water, they are not specifically effective for heavy metals.
- **Carbo, Methyl, Chitosan:** This substance is primarily used in medical applications, such as cancer treatment, and is not a method for removing heavy metals from water.

6. **Conclusion:**
- Based on the evaluation, the most effective method for removing heavy metals like nickel from water is **biological treatment**.

**Final Answer:**
Heavy metals like nickel can be removed from water with the help of **biological treatment**.

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