Control of thermal pollution

CONTROL OF THERMAL POLLUTION

Reduction of Noise at source

  • Select a better machinery even if expensive which produces lease noise. Some extent noise may have a relation with
  • Handling materials and equipments gently, which produces noises when it is handled improperly. For example, trolleys, trucks etc.
  • Better supporting structures and tight fixing can reduce the noise up to 3 dB.
  • Use of resilient materials like rubber, springs , felt etc can reduce noise.
  • Noise isolation can be achieved by enclosing noise producing area from the other or keeping away from the normal human activity.
  • Better maintenance and greasing the machine will lead to reduction of noise and machine performance.

Noise Control by Absorption of Reflected Sound

  • Ceiling
    • The absorptivity of the ceiling can be increased by introducing large absorbing area. By using suspended grid systems or by vertically suspending panels of noise absorbing materials can be used for this purpose.
  • Screens
    • Sound reduction of about 10 dB can be achieved by using proper screens near the noise location. Woolen boards, perforated asbestos, teak plywood etc are used for this purpose.
  • Noise Pollution by Design
    • Proper aquastics of building could reduce the noise and echoing to a great extent. Excellent sound insulation is achieved by construction of glassed windows without space by filling with sound absorbing material.
  • Planting Trees
    • The presence of trees near the noise site can reduce the noise by 8-10 dB. It has been reported that dense evergreen forest can reduce the noise by 18 dB by multiple scattering by dense barrier.
  • Use of Ear Protection Aids
    • In noise industries workers are provided with ear protection aids, like earplugs, headphones, noise helmets etc.
  • Noise Control by Town Planning and Legislation
    • It is the duty of the planners to segregate industrial area, highways etc from the residential area.
    • Legislators are to make acceptable law and their coordinates to help in implementing the same in letter and spirit.
Last modified: Wednesday, 9 March 2011, 6:06 AM