Sewage water is prurified by
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Sewage purification is done using physical, biological and chemical methods.
Sewage purification involves a few stages and has a lot of methods by which it is done globally, main stages are:
• Pre-treatment: screening and removal of solids (mainly inorganic solids) from the wastewater, sometimes also by sedimentation. After this grit removal is next.
• Primary treatment: mainly done by sedimentation in large basins or tanks, this separates sludge and other materials such as fat from the wastewater. The primary treatment stage of sewage purification is complex, has a lot of methods and is the longest.
• Anaerobic or aerobic digestion of contaminants – mainly for sludge.
• Constructed wetlands that have plants that oxygenates the water and absorbs toxins.
• Sedimentation and oxygenation lagoons
• Incineration of treated sludge.
• Producing fertilizers from treated sludge.
• Filter and/or oxidizing beds.
• Nutrient, Nitrogen, Phosphorus removal.