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India's Water Future: Cities Reuse Wastewater
10 Jul
Summary
- Rural India faces water crisis exacerbated by climate change.
- Bengaluru reuses treated wastewater, second globally.
- Wastewater recharge boosts rural groundwater levels significantly.
The climate crisis intensifies India's water scarcity, with unpredictable rainfall and depleted aquifers threatening rural communities. A significant portion of India's workforce, reliant on agriculture, faces increasing water challenges.
Bengaluru exemplifies a new strategy by treating wastewater not as waste but as a valuable resource. The city produces nearly 1.9 billion litres of wastewater daily, with a substantial portion now reused. This initiative, particularly the KC Valley project, channels treated water to drought-affected rural districts.
This urban wastewater offers a drought-proof water source, unlike unreliable rainfall. Bengaluru is transferring approximately 650 million litres of treated water daily to Kolar and Chikkaballapur. This water revitalizes a network of over 200 restored lakes and tanks in these districts.
The treated water percolates through soil, naturally purifying and recharging aquifers. This soil aquifer treatment process yields water suitable for agriculture and, with further treatment, for drinking.
Innovative projects, like one near Devanahalli, are already supplying about 12% of local water needs through revived open wells. This approach has demonstrated a 58% to 73% increase in groundwater levels and a tenfold rise in recharge rates.
Challenges remain, including lake eutrophication and the need for advanced treatment as systems scale up. Despite these issues, India is pioneering one of the world's most ambitious rural water resilience plans using urban wastewater.
