Why in news?
The Ministry of Jal Shakti emphasized that effective greywater reuse can save 30-40% of total water use by recycling wastewater. Promote simple and sustainable technologies like soak pits at household or community levels under schemes such as Swachh Bharat Mission (Grameen) Phase-II.
 
What is Greywater management?

• Greywater management refers to the treatment and reuse of domestic wastewater generated from sources like bathing, laundry, and kitchen sinks but excluding toilet waste (blackwater).

Key Aspects of Greywater Management

• Sources and Nature: Greywater is wastewater without fecal contamination, making it easier and safer to treat compared to sewage.
• Health Implications: Proper management is necessary to avoid health risks from stagnant greywater, such as mosquito-borne diseases.
• Treatment Technologies:
  • Household Level: Soak pits, leach pits, magic pits, and simple filtration or settling tanks are common.
  • Community Level: Cluster greywater pits, waste stabilization ponds, constructed wetlands, phytorid technology, and decentralized wastewater treatment systems (DEWATS).
  • Nature-Based Solutions: Constructed wetlands, green roofs, and biofilters that use plants and microbes to break down contaminants.
  • Mechanical and Biological Systems: Filtration, membrane bioreactors, activated sludge processes, and ultraviolet disinfection.
• Reuse: Treated greywater is reused for non-potable purposes such as irrigation, toilet flushing, and washing, thus conserving high-quality freshwater resources.
• Implementation Strategy: Preferably managed at household or gram panchayat/village level with convergence with water supply schemes for integrated water management.

Benefits

• Reduces freshwater demand
• Minimizes wastewater discharge and environmental contamination
• Decreases the load on sewage treatment facilities
• Supports safe water reuse for irrigation and other purposes

Challenges

• Appropriate technological selection based on geography, demography, and land availability
• Maintenance and monitoring
• Public awareness and capacity building for adoption at rural and urban levels

Overall, greywater management involves decentralized, cost-effective, and simple technologies that communities can adopt to promote water reuse and sanitation hygiene sustainably.

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