Transforming Wastewater Treatment

Key Highlights:

• The Namami Gange Programme, launched in 2014, is an Integrated Conservation Mission for pollution abatement and rejuvenation of the National River Ganga.
• It has undertaken 199 sewerage infrastructure projects worth ₹31,327 crore, creating 2,237 MLD new Sewage Treatment Plant (STP) capacity and rehabilitating 873 MLD.
• The programme adopts a technology-neutral approach, utilizing diverse methods like Food Chain Reactor (FCR), Electrocoagulation, and Sequential Batch Reactor.
• Innovative solutions include multi-storey STPs (e.g., Muni Ki Reti), constructed wetlands (e.g., Bithoor), and Johkasou packaged systems.
• Advanced biological treatment like NEREDA and natural methods like Soil Biotechnology are employed for efficient wastewater management.
• It emphasizes energy recovery through biogas generation and solar power, efficient sludge management, and long-term operation via the Hybrid Annuity Model (HAM).

Detailed Insights:

• The Namami Gange Programme's twin objectives are effective abatement of pollution and conservation/rejuvenation of the Ganga River.
• The programme aims to create a total of 5,270 MLD of new STP capacity and rehabilitate 925 MLD of existing capacity.
• Food Chain Reactor (FCR) technology, introduced via NGP, improves upon the Activated Sludge Process with a smaller footprint, lower power consumption, and nutrient removal.
• Electrocoagulation is a non-biological treatment using electric current, suitable for cold temperatures and hilly terrains, implemented in Uttarakhand.
• Multi-storey STPs, such as the country's first four-storey municipal plant at Muni Ki Reti, address land constraints through vertical construction.
• Constructed Wetlands (CWs) are nature-based systems using plants and microorganisms for in-situ treatment in smaller habitations, exemplified in Bithoor.
• Johkasou provides a decentralised, packaged treatment option for low-flow applications and locations where civil construction is challenging.
• NEREDA is an efficient biological treatment using aerobic granular sludge, offering a smaller footprint, lower construction costs, and significant power savings.
• Soil Biotechnology is a natural treatment system combining physical and biochemical processes, minimizing mechanical equipment, as seen at Devprayag.
• Faecal Sludge and Septage Management (FSSM) addresses treatment for areas not connected to conventional sewerage networks, often through co-processing.
• Energy recovery is achieved through biogas generation from anaerobic digestion of sludge, contributing significantly to STP power needs in places like Varanasi and Prayagraj.
• Green STPs integrate on-site solar power plants and efficient equipment to reduce operational costs and enhance environmental sustainability.
• Sludge management includes dewatering using devices like Volute Press and thermal stabilisation through incineration pilots, such as at Rishikesh.
• Rehabilitation efforts upgrade ageing STP equipment and trunk sewers, ensuring compliance with treatment standards and long-term performance.
• The Hybrid Annuity Model (HAM)-based Public-Private Partnership (PPP) and One City/Cluster–One Operator model ensure sustained operation and accountability over 15 years.

Key Concepts Involved:

• Namami Gange Programme: An Integrated Conservation Mission launched in 2014 for pollution abatement and rejuvenation of the National River Ganga.
• Hybrid Annuity Model (HAM): A Public-Private Partnership (PPP) model where the government pays a fixed annuity to the private developer for construction and operation over a period.
• Sewage Treatment Plant (STP): A facility designed to remove contaminants from wastewater to produce an effluent suitable for discharge or reuse.
• Biochemical Oxygen Demand (BOD): A measure of the amount of dissolved oxygen required by aerobic biological organisms to break down organic material in a water sample.