CEGR Environmental Engineering IIName:1. Short answer1.1Why de-chlorinate at wastewater treatment plants is required before dischargingwater?The essence of de-chlorination of wastewater before discharge is to remove thechlorine residues because they have toxic effects on aquatic life.1.2Why pretreatment required for industrial wastewater?To remove harmful pollutants from the wastewater before releasing it to thesewerage systems. Releasing untreated waste water would cause pollution to thereceiving water bodies.1.3What is backwashing?It is the process of pumping water backwards through the cleaning medium,mainly as a maintenance technique, to clean the water filtering system.1.4Why is carbon dioxide important in the atmosphere?Carbon dioxide presence in the atmosphere makes vital processes such asphotosynthesis and respiration occur. It is through such processes that oxygen;which is vital to humanity is generated and replenished.2. How do greenhouse gases affect global climate condition?They absorb the radiation from the sun, and emit thermal infrared radiation, hencecausing global warming (rise in temperatures). The persistence of the conditionleads to desertification of the affected land.3. It is high time for human beings to take the right action towards saving the earth frommajor environmental issues. If ignored today, these ill effects are sure to curb humanexistence in the near future. Our planet e ...
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