Water cleared off sludge in Waste Water Treatment Plant (WWTP) is known as - 

The correct answer is Reclaimed water.

Key Points

• Reclaimed water, also known as recycled water, is treated wastewater that is purified and reused for various purposes, including irrigation, industrial processes, and groundwater recharge.
• It is a vital resource in wastewater treatment plants (WWTPs) to ensure water sustainability and reduce dependency on freshwater sources.
• Reclaimed water typically undergoes several stages of treatment, such as primary, secondary, and tertiary treatment, to remove contaminants and pathogens.
• Many countries, including the USA, Australia, and Singapore, have adopted the use of reclaimed water in urban and agricultural settings to combat water scarcity.
• The use of reclaimed water helps conserve water resources, reduce pollution, and promote sustainable water management practices.

Additional Information

• Primary Treatment: The initial stage of wastewater treatment involves the removal of large solids, oils, and grease through processes like sedimentation and screening.
• Secondary Treatment: A biological process that removes organic matter and nutrients using microorganisms, typically through activated sludge systems or biofilters.
• Tertiary Treatment: The final stage of wastewater treatment, which involves advanced processes like filtration, disinfection (e.g., chlorination or UV treatment), and chemical treatments to ensure water quality.
• Uses of Reclaimed Water: Reclaimed water is used for agricultural irrigation, industrial cooling, landscaping, replenishing groundwater aquifers, and even potable reuse in some regions.
• Environmental Benefits: Reclaiming wastewater reduces the discharge of pollutants into natural water bodies, minimizes water extraction from ecosystems, and supports sustainable urban development.