Discuss the steps to be taken to minimise environmental degradation by industry?
Industries cause significant environmental degradation through air, water, land, and noise pollution. To minimise this degradation, several important steps need to be taken.
First, water pollution can be controlled by minimising water use through reusing and recycling it in two or more successive stages. Rainwater harvesting should be adopted to meet water requirements. Hot water and effluents must be treated before being released into rivers and ponds. This treatment involves three phases: Primary treatment by mechanical means (screening, grinding, flocculation, and sedimentation), Secondary treatment by biological processes, and Tertiary treatment using biological, chemical, and physical processes that involve recycling of wastewater. Overdrawing of groundwater reserves also needs to be regulated legally.
Second, air pollution can be reduced by fitting smoke stacks with electrostatic precipitators, fabric filters, scrubbers, and inertial separators to reduce particulate matter. Smoke can be minimised by using oil or gas instead of coal in factories.
Third, noise pollution can be controlled by fitting generators with silencers and redesigning machinery to increase energy efficiency and reduce noise. Noise absorbing materials may be used along with personal protective equipment like earplugs.
Finally, the challenge of sustainable development requires integration of economic development with environmental concerns.
Explanation
This answer is structured as a 5-mark long answer covering all major steps mentioned in the NCERT textbook. The context provides specific measures for controlling water pollution (minimising use, rainwater harvesting, three-phase effluent treatment), air pollution (electrostatic precipitators, using cleaner fuels), and noise pollution (silencers, redesigning machinery). The answer also includes the concept of sustainable development which integrates economic growth with environmental protection.