A water body characterized by nutrient rich water supports abundant growth of phytoplanktons and other water plants on its surface. Over time, the water body gets filled with a large number of such plants and the process is called Eutrophication. In such water bodies, dissolved oxygen content is nil or very less.
Which of the following steps are used to treat industrial wastes and reduce pollution?
(i) Recycle the wastes
(ii) Discharge the wastes into the sea
(iii) Treat and neutralise harmful chemicals in the wastes

Options

A. Only (i) and (ii)
B. Only (i) and (ii)
C. Only (ii) and (iii)
D. All the these

Explanation

To address the question regarding the treatment of industrial wastes and the reduction of pollution, we will analyze each of the proposed steps:

1. **Recycle the wastes**: Recycling industrial wastes involves processing the waste materials so they can be reused. This reduces the amount of waste generated and minimizes the release of pollutants into the environment. By recycling, we can conserve resources and reduce the overall impact on the ecosystem. Thus, this step is effective in treating industrial wastes and reducing pollution.

2. **Discharge the wastes into the sea**: Discharging industrial wastes into the sea is not a solution to pollution. In fact, this action would exacerbate the problem by introducing harmful pollutants into marine ecosystems. This can lead to severe environmental consequences, including eutrophication, which is characterized by excessive nutrient enrichment and depletion of dissolved oxygen. Therefore, this step is not effective and should be avoided.

3. **Treat and neutralize harmful chemicals in the wastes**: This step involves treating industrial wastes to neutralize harmful chemicals before they are released into the environment. By treating these wastes, we can reduce their toxicity and mitigate their harmful effects on ecosystems. This is an effective method for managing industrial waste and reducing pollution.

**Conclusion**: Based on the analysis, the effective steps to treat industrial wastes and reduce pollution are:
- (i) Recycle the wastes
- (iii) Treat and neutralize harmful chemicals in the wastes

Thus, the correct options are (i) and (iii).