Project : The Wastewater Story
Note :- Write main points of the chapter.
Answers
Answer:
Rich in lather, mixed with oil, black– brown water that goes down the drains from sinks, showers, toilets, laundries is dirty. It is called wastewater. This used water should not be wasted. We must clean it up by removing pollutants.
Answer:
The waste water story:
Explanation:
During primary treatment, wastewater is temporarily held in a settling tank where heavier solids sink to the bottom while lighter solids float to the surface.
Secondary treatment of wastewater works on a deeper level than primary and is designed to substantially degrade the biological content of the waste through aerobic biological processes.
1 Biofiltration
Biofiltration uses sand filters, contact filters or trickling filters to ensure that any additional sediment is removed from the wastewater.
2 Aeration
Aeration is a lengthy process which increases oxygen saturation by introducing air to wastewater.
3 Oxidation ponds
Typically used in warmer climates, this method utilises natural bodies of water such as lagoons, allowing wastewater