General Design Considerations Waste disposal Waste Disposal 1
- Slides: 9
General Design Considerations “Waste disposal”
Waste Disposal 1 - Gas waste air pollution The waste gas may contains solid particles or toxic gases The solid particles may be removed by: ØCyclones ØElectrostatic precipitator ØVenturi scrubber The toxic gases may be removed by ØAbsorption, Scrubbing, Washing……. The most dangerous toxic gases are SOx, NOx, Cl 2, NH 3
ØThese gases cause ozone depletion where they consume O 3 through the following reactions: SO 2 + O 3 = SO 3 + O 2 NO + O 3 = NO 2 + O 2 Cl + O 3 = Cl. O + O 2 Cl. O + O = Cl + O 2 O 3 absorbs U. V rays which cause skin cancer and premature aging……
Waste Disposal (cont. ) Liquid waste water pollution Causes of water pollution: 1. Dissolved inorganic salts ( Ca and Mg Salts) 2. Acids and alkalies 3. Suspended solids and floating matters 4. Oxygen consuming materials 5. Toxic and coloring materials
BOD (Biological Oxygen Demand) ØThe amount of free oxygen required to oxidize the organic matter present in the waste water by aerobic bacteria present in it. COD (Chemical Oxygen Demand) ØThe amount of free oxygen required to oxidize the organic matter present in the waste water by chemical oxidants.
Solid Wastes land (soil pollution) ØUnderground water pollution through leaching operation To solve the problem of solid wastes ØIncineration and burying in concrete encased blocks are possible solutions ØLandfilling in un inhibited area
Incinerator
Landfilliing in concrete encased block
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