Water Circularity
For Prelims: Composite Water Management Index, Water Circularity, Industry 4.0, 3G Ethanol Production, AMRUT 2.0, Central Pollution Control Board
For Mains: Water crisis and management in India, Wastewater treatment and reuse in India, Circular economy.
Why in the News?
A study titled "Waste to Worth: Managing India’s Urban Water Crisis Through Wastewater Reuse," published by the Centre for Science and Environment (CSE), emphasizes the importance of water circularity. It advocates the reuse of treated wastewater as a solution to both the growing water scarcity and environmental degradation in India.
Key Findings of the Study on Wastewater Reuse
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India’s Growing Water Scarcity: India ranks 132nd globally in per capita water availability (India-WRIS), with freshwater resources declining by 73% since 1951 (from 5,200 cubic meters per capita to 1,486 m³ in 2021). Projections suggest a further drop to 1,367 m³ per capita by 2031. India already faces water stress (below 1,700 m³ per capita) and risks becoming water-scarce (below 1,000 m³ per capita) without urgent intervention.
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Water Supply vs. Demand: India accounts for just 2% of the world’s landmass but only has 4% of global freshwater resources, despite supporting 18% of the world’s population and 15% of its livestock. This imbalance creates significant pressure on India’s water supply.
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Wastewater Generation Crisis: In 2020-21, urban India generated 72,368 million liters per day (MLD) of sewage, but only 44% (31,841 MLD) of it had treatment capacity, and only 28% (20,236 MLD) was treated. The remaining 72% went untreated, causing severe water pollution. Wastewater generation is expected to increase by 75-80% over the next 25 years, reaching 48 billion cubic meters (BCM) annually by 2050—far exceeding current treatment capacity.
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Water Governance Challenges: Indian cities depend on distant rivers (e.g., Cauvery for Bengaluru, Krishna and Godavari for Hyderabad), increasing costs and exacerbating shortages, particularly in urban peripheries and informal settlements. The NITI Aayog’s Composite Water Management Index shows 16 states scoring below 50 out of 100, signaling poor water management. Additionally, untreated sewage is commonly discharged into water bodies.
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Policy Gaps: While the Ministry of Jal Shakti mandates cities to reuse at least 20% of treated water, compliance remains low. Informal reuse of wastewater in agriculture and industry occurs without structured policies, and untreated sewage is used by farmers, risking health.
What is Water Circularity?
Water circularity involves recycling, reusing, and recovering resources within the water treatment cycle, aiming to maximize value for individuals, businesses, and the environment. This practice reduces waste, lowers pollution, and regenerates natural ecosystems.
Benefits of Water Circularity:
- Cost Reduction: Recycling treated wastewater reduces industrial water costs, particularly in power plants and data centers supporting Industry 4.0.
- Agricultural Benefits: India generates approximately 317 km³ of municipal wastewater annually, which could irrigate 40 million hectares, about 10% of the nation’s irrigated land.
- Economic Value: Wastewater recycling in thermal power plants can save 10 million cubic meters of water per year and generate $300 million annually in benefits.
- Nutrient Recovery: Cities generate 2,500 tonnes of nutrients daily from sewage, valued at Rs 19.5 million. Recovering nitrogen and phosphorus from wastewater to produce organic fertilizers can reduce reliance on synthetic alternatives, improving soil health and boosting agricultural productivity.
- Groundwater Recharge: Using treated sewage for artificial groundwater recharge helps replenish aquifers and enhance water security.
- Energy Generation: Extracting biogas from wastewater can power water utilities, while algal biofuel production (3G ethanol) can reduce environmental impact and support India’s climate policies.
Measures to Strengthen Wastewater Reuse in India
- Water Credit System: Similar to carbon trading, water reuse credits can incentivize industries to adopt water-efficient practices.
- Decentralized Treatment Systems: Implementing decentralized wastewater treatment systems at the household, community, or institutional levels can reduce pressure on centralized sewage treatment plants (STPs) and increase local reuse. Integrating localized systems within Smart Cities under AMRUT 2.0 is essential.
- Mandates for Industries and Power Plants: Enforce 100% treated wastewater use in thermal power plants within a 50 km radius of STPs, as per the Power Tariff Policy of 2016.
- Wastewater Distribution Networks: Repurposing unused canal networks to channel treated wastewater for irrigation, as demonstrated by Uttar Pradesh, can enhance resource utilization.
- Incentives and Regulations: Provide tax incentives, low-interest loans, and financial support for private investments in wastewater recycling. Enforce zero-liquid discharge (ZLD) systems in industries and offer subsidies for adopting these technologies.
- Monitoring and Compliance: Enforce stringent standards by the Central Pollution Control Board (CPCB) for wastewater discharge, alongside regular audits. Utilize IoT-based sensors for real-time water quality monitoring at STPs.
Drishti Mains Question:
What is water circularity, and how can it help address India’s water crisis?
UPSC Civil Services Examination, Previous Year Question (PYQ)
Prelims
Q.1. Which of the following ancient towns is well-known for its elaborate system of water harvesting and management, including the construction of dams and water reservoirs? (2021)
(a) Dholavira
(b) Kalibangan
(c) Rakhigarhi
(d) Ropar
Ans: (a)
Dholavira, located on Khadir Beyt in the Rann of Kutch, is noted for its sophisticated water management system, including dams and interconnected reservoirs. It is one of the most significant Harappan sites and showcases advanced urban planning, construction, and water management techniques.
Q.2. With reference to ‘Water Credit,’ consider the following statements: (2021)
- It applies microfinance tools to the water and sanitation sector.
- It is a global initiative launched under the World Health Organization and the World Bank.
- It aims to help poor communities meet their water needs without relying on subsidies.
Which of the statements is/are correct?
(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2, and 3
Ans: (c)
WaterCredit is a microfinance program that addresses the need for affordable water and sanitation solutions, helping poor communities access financing for water infrastructure without relying on subsidies. However, it is not a World Health Organization or World Bank initiative but is launched by Water.org, a non-profit organization.
Mains
Q.1. What are the key features of the Jal Shakti Abhiyan, launched by the Government of India for water conservation and security? (2020)
Q.2. Suggest measures to improve water storage and irrigation systems to ensure efficient use amid depleting water resources. (2020)
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