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Difficulty: HardConservation of Natural Resources and Environmental Management

An estuarine wetland ecosystem in a coastal industrial corridor experiences severe eutrophication due to untreated organic sewage and industrial runoff, leading to a critical decline in dissolved oxygen and widespread fish kills. Which integrated environmental management approach provides the most ecologically sustainable solution to restore the water quality and preserve biodiversity in the wetland?

  1. Implementation of biological wastewater treatment and bioremediation using micro-organisms, combined with enforcing statutory effluent limits on industrial discharge.Answer
  2. B
    Draining the entire wetland basin to completely remove organic matter and allowing primary succession to re-establish the ecological community on bare rock substrate.
  3. C
    Applying persistent chemical oxidants continuously to the entire estuarine basin to artificialize dissolved oxygen levels while ignoring upstream effluent sources.
  4. D
    Constructing aquatic physical barriers to invert the ecosystem's pyramid of energy, thereby reducing energy loss at decomposer trophic levels.

Answer

Implementation of biological wastewater treatment and bioremediation using micro-organisms, combined with enforcing statutory effluent limits on industrial discharge.
Combining biological wastewater treatment and bioremediation directly neutralizes excess organic nutrients and pollutants. Enforcing effluent discharge limits prevents continuous influx of contaminants, offering a sustainable, long-term solution for wetland restoration.

Step-by-Step Solution

1
Identify the primary environmental problem
Eutrophication caused by excess organic nutrients in untreated sewage and industrial effluent.
Excess nutrients trigger algal blooms whose subsequent decomposition consumes dissolved oxygen, leading to hypoxia.
2
Evaluate sustainable restoration methods
Bioremediation and biological wastewater treatment degrade organic pollutants into harmless inorganic substances.
Biological treatment utilizes decomposers naturally without introducing toxic chemical residues.
3
Integrate regulatory management controls
Enforcing statutory effluent standards prevents ongoing nutrient input.
Sustainable conservation requires combining biological remediation techniques with legal and institutional enforcement.

Key Concept

Water pollution control and biological environmental management
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Topics

Conservation of Natural Resources and Environmental Management

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