Correct Option
The correct option isTreatment of effluents before release
Explanation
Industrial discharge is a significant source of water pollution, introducing heavy metals, toxic chemicals, and organic waste into aquatic ecosystems. The primary objective of pollution control strategies is to reduce the toxicity and volume of these pollutants before they enter natural water bodies.
Option Analysis
- Direct release into rivers is incorrect: Direct release of industrial waste into rivers is the primary cause of water pollution. It leads to immediate degradation of water quality, harming aquatic life and making water unsafe for consumption.
- Treatment of effluents before release is correct: Treating effluents before release is the most effective strategy. This involves physical, chemical, and biological processes (such as Effluent Treatment Plants or ETPs) to remove contaminants, neutralize pH levels, and reduce Biological Oxygen Demand (BOD) to safe limits defined by environmental regulations.
- Storage in open ponds is incorrect: Storage in open ponds is not a solution; it poses severe risks of groundwater contamination through leaching and overflow during precipitation, merely delaying pollution rather than controlling it.
- Mixing with chemical fertilizers is incorrect: Mixing industrial waste with chemical fertilizers is scientifically unsound. It would likely increase the chemical load in soil and water runoff, exacerbating eutrophication and toxicity rather than mitigating pollution.
Key Takeaway: The mandatory treatment of industrial effluents (wastewater) to meet environmental safety standards prior to discharge is the fundamental method for controlling industrial water pollution.