Recent Developments:
- In October 2026, the Ministry of Jal Shakti highlighted industrial pollution control under the Namami Gange Programme (NGP), reinforcing the need for effective wastewater treatment, regulatory compliance and sustainable river management.
- In July 2026, the National Mission for Clean Ganga (NMCG) advanced its focus on nature-based solutions, including pilot projects and training to improve wastewater management and river rejuvenation.
- By July 2026, the programme had sanctioned 218 sewerage infrastructure projects with a combined treatment capacity of approximately 6,610 million litres per day (MLD). Of these, 145 projects had been completed, creating or rehabilitating approximately 4,263 MLD of treatment capacity.
- The programme increasingly emphasises treated wastewater reuse, digital monitoring, decentralised treatment and resource-efficient technologies, alongside conventional sewage treatment infrastructure.
Namami Gange Programme: Objectives and Implementation
Overview and Institutional Framework:
- The Namami Gange Programme is an integrated conservation mission launched by the Government of India in June 2014 to achieve the twin objectives of pollution abatement and conservation and rejuvenation of the River Ganga.
- The programme is implemented by the National Mission for Clean Ganga, under the Ministry of Jal Shakti. Its mandate includes pollution control, ecological restoration and coordination among institutions across the Ganga basin.
- Phase I was implemented up to March 2021 with an outlay of ₹20,000 crore, while Phase II was sanctioned up to March 2026 with an outlay of ₹22,500 crore.
- As reported in March 2026, a total of 524 projects had been sanctioned under the programme, of which 355 were completed by February 2026. These figures cover multiple types of interventions, not only sewerage infrastructure.
Major Components and Intervention Framework:
- Nirmal Ganga: Reduces pollution through sewage treatment, industrial effluent control and improved waste management.
- Aviral Ganga: Supports ecological integrity and the maintenance of adequate river flow, including environmental-flow considerations.
- Jan Ganga: Promotes public participation, community awareness and citizen involvement in river conservation.
- Gyan Ganga: Encourages scientific research, water-quality monitoring and evidence-based river management.
- Other components include riverfront development, surface cleaning, afforestation, biodiversity conservation, industrial pollution monitoring and the development of Ganga Gram.
Wastewater Treatment Technologies under Namami Gange:
Conventional Biological Treatment:
- Activated Sludge Process: Uses microorganisms suspended in wastewater to break down organic pollutants. It is widely used but can require substantial energy for aeration and sufficient space for treatment infrastructure.
- Sequential Batch Reactor: Treats wastewater in a single tank through successive stages, including filling, biological reaction, settling and discharge. Its operational flexibility makes it suitable for municipal sewage treatment.
- Upflow Anaerobic Sludge Blanket: Uses anaerobic microorganisms to decompose organic matter in wastewater. It can reduce energy requirements and generate biogas, although additional treatment may be necessary to meet discharge standards.
- Moving Bed Biofilm Reactor: Uses microorganisms attached to specially designed carrier media, allowing biological treatment within a relatively compact system.
Advanced Biological Treatment Technologies:
- Food Chain Reactor: Combines activated sludge, fixed artificial media and plant roots to remove organic pollutants and nutrients. Five systems were reported operational, including two in Bhatpara, West Bengal, and three in Prayagraj, Uttar Pradesh; another was under construction at Bhagalpur, Bihar.
- NEREDA Technology: Uses aerobic granular sludge, in which compact microbial granules provide efficient settling and biological treatment. It can reduce space and energy requirements; reported power savings are approximately 50% compared with the Activated Sludge Process and 20% compared with the Sequential Batch Reactor, although actual performance depends on operating conditions.
- These technologies can improve treatment efficiency, but their selection must account for sewage characteristics, energy availability, maintenance capacity, land constraints and the quality standards required for treated water.
Electrochemical and Advanced Oxidation Technologies:
- Electrocoagulation: Uses electric current and metal electrodes to destabilise suspended and emulsified pollutants, facilitating their removal from wastewater. It may be useful in mountainous terrain, cold climates and locations with limited space; 17 installations were reported in Uttarakhand, including Badrinath and Chamoli.
- Advanced Oxidation Processes: Use highly reactive oxidising agents to break down certain persistent pollutants. They can support on-site wastewater treatment, although energy use, operating costs and the characteristics of the contaminants influence their suitability.
- These methods can complement biological treatment but do not automatically replace the need for appropriate primary treatment, disinfection or safe management of residual sludge.
Nature-Based and Decentralised Treatment:
- Constructed Wetlands: These engineered ecosystems use aquatic plants, soil, substrates and microorganisms to remove pollutants through physical, chemical and biological processes. At Bithoor in Uttar Pradesh, six constructed wetlands were reported to treat approximately 2 MLD of wastewater, reducing Biochemical Oxygen Demand (BOD) from around 75 milligrams per litre to below 10 milligrams per litre.
- Soil Biotechnology: Combines filtration, sedimentation, infiltration and microbial decomposition to remove pollutants. Its nature-based approach can support wastewater treatment where local soil conditions and land availability are suitable.
- Johkasou Technology: Uses compact, prefabricated decentralised systems that integrate biological treatment, settling, filtration and disinfection. Six installations were reported in Uttarakhand, demonstrating their potential for small settlements and hilly locations without conventional sewer networks.
- Nature-based systems may provide additional ecological benefits, but their performance depends on design, seasonal conditions, hydraulic loading and regular maintenance.
Space-Efficient and On-Site Sanitation:
- Multi-storey Sewage Treatment Plants: Use vertical infrastructure to reduce land requirements in densely populated areas. India’s first four-storey municipal sewage treatment plant was developed at Muni Ki Reti in Uttarakhand, with a capacity of 7.5 MLD.
- Faecal Sludge and Septage Management: Treats sludge collected from septic tanks and on-site sanitation systems, extending sanitation services to settlements without sewer networks. A pilot faecal sludge treatment plant with a capacity of 10 kilolitres per day was sanctioned at Chunar, Uttar Pradesh.
- Decentralised treatment can reduce dependence on extensive sewer networks, but safe sludge transport, treatment, disposal and reuse remain essential.
Monitoring, Treated-Water Reuse and River-Basin Management:
Monitoring and Regulatory Compliance:
- Effective river rejuvenation requires continuous monitoring of sewage-treatment performance, wastewater discharge and river-water quality. Digital dashboards, drain mapping and surveillance systems can improve operational oversight and help identify pollution hotspots.
- Industrial effluent control is essential because untreated industrial discharges can introduce toxic chemicals and other pollutants that conventional municipal sewage treatment may not adequately remove.
- The Central Pollution Control Board and relevant state pollution control boards play important roles in water-quality monitoring, pollution-control standards and regulatory enforcement.
Reuse and Circular Water Management:
- Treated wastewater reuse can reduce freshwater demand when suitable treatment standards are met. Potential applications include industrial processes, gardening, urban landscaping and other non-potable uses.
- Reuse requires water-quality testing, fit-for-purpose treatment, separate distribution systems and safeguards against human exposure to contaminants.
- Recovering energy and useful materials from wastewater, alongside responsible sludge management, can improve resource efficiency and reduce the long-term operating costs of treatment infrastructure.
River-Basin Approach:
- River pollution cannot be addressed solely by cleaning the main river channel. A river-basin approach must account for tributaries, drains, groundwater interactions, urban settlements, industrial clusters and upstream land-use patterns.
- Maintaining environmental flows supports river ecology and the capacity of rivers to assimilate treated discharges, although natural dilution cannot substitute for effective pollution prevention and treatment.
- Coordination among the Union Government, state governments, urban local bodies, industries and communities is necessary because sewage generation, infrastructure operation and pollution enforcement involve multiple institutions.
Challenges and the Way Forward:
Key Implementation Challenges:
- Infrastructure and operational gaps: Constructing treatment plants is insufficient unless sewer connections, reliable electricity, trained personnel, maintenance and performance monitoring are also ensured.
- Technology suitability: No single treatment technology is appropriate for every location. Land availability, climate, sewage composition, energy consumption, lifecycle costs and local technical capacity must guide technology selection.
- Financial sustainability: High capital expenditure and recurring operational costs can affect the long-term functioning of sewage treatment plants, particularly where user charges and municipal resources are inadequate.
- Industrial pollution: Effective enforcement, accurate discharge monitoring and accountability for non-compliance are necessary to prevent untreated industrial effluents from undermining river-cleaning efforts.
- Reuse and public acceptance: Treated water requires dependable quality standards, suitable infrastructure and public confidence before it can become a reliable alternative to freshwater.
Priorities for Sustainable River Rejuvenation:
- Adopt a technology-neutral approach: Select conventional, advanced biological, electrochemical or nature-based systems according to local requirements rather than assuming that one technology is universally superior.
- Strengthen performance-based operations: Monitor treatment efficiency, energy consumption, compliance with discharge standards and plant uptime throughout the operational life of infrastructure.
- Expand decentralised sanitation: Integrate sewage networks with local treatment systems and faecal sludge management to serve smaller settlements and difficult terrain.
- Promote wastewater reuse: Develop reliable reuse markets and infrastructure while ensuring that treated water meets standards appropriate to its intended application.
- Improve institutional coordination: Strengthen coordination among pollution-control authorities, urban local bodies, industries, research institutions and communities.
- Integrate ecological restoration: Combine pollution control with wetland conservation, biodiversity protection, environmental-flow management and public participation.
Value Addition for UPSC:
Key Concepts and Examination Linkages:
- Biochemical Oxygen Demand: BOD measures the oxygen required by microorganisms to decompose biodegradable organic matter in water. A high BOD generally indicates greater organic pollution and can reduce dissolved oxygen available to aquatic organisms.
- Dissolved Oxygen: Adequate dissolved oxygen is essential for aquatic life. Organic pollution can lower dissolved oxygen as microorganisms consume it during decomposition.
- Circular Economy: Wastewater can be treated as a resource for water reuse, energy recovery and material recovery, reducing waste and pressure on freshwater supplies.
- Nature-Based Solutions: These use or replicate natural processes to address environmental challenges while potentially providing ecological and social co-benefits.
- General Studies Paper II: Government policies, institutional coordination, local governance and programme implementation.
- General Studies Paper III: Environmental pollution, water security, sustainable technology, biodiversity conservation and infrastructure development.
Conclusion: The Namami Gange Programme demonstrates the shift from conventional sewage infrastructure towards technology-driven, decentralised and resource-efficient wastewater management. Its long-term success depends not merely on creating treatment capacity but also on effective operation, industrial compliance, treated-water reuse and ecological restoration across the entire river basin.
