Safe Reuse of Treated Wastewater: 3% Reuse, 126.45 MLD Prayagraj Potential and India's Circular Water | CurrentPulse AI
Safe Reuse of Treated Wastewater: 3% Reuse, 126.45 MLD Prayagraj Potential and India's Circular Water
📅 Published 1 September 2026•⏱ 6 min read•EnvironmentGS-3
Economy
Safe Reuse of Treated Wastewater:3% Reuse, 126.45 MLD
Prayagraj Potential and India's Circular Water Economy
Why in News?
Safe Reuse of Treated Wastewater is emerging as a national urban-water priority as freshwater scarcity, sewage
pollution and industrial demand intensify.
NITI Aayog has noted that less than 1,000 MLD, about 3% of treated wastewater and around 1% of total
wastewater generated, was being reused for valuable purposes in the baseline assessment it cited.
Recent city-level reuse plans under the Ganga framework show how treated sewage can substitute freshwater in
power plants, railways, landscaping and selected irrigation uses.
Prayagraj
Project-Level Numbers
Prayagraj's identified reuse projects together represent 126.45 MLD of potential treated-water reuse with
estimated investment of about ₹1,625 crore.
Naini STPIII to Prayagraj Power Generation Company has a proposed reuse link of 50 MLD.
Naini I and II STPs to Meja Urja Nigam have a proposed combined reuse of 72 MLD.
Railway reuse projects include 3.32 MLD from Rajapur STP to Prayagraj Junction and 1.13 MLD from Kodra
STP to Subedarganj Railway Station.
Agra
Sewage and Reuse Data
Agra generates about 286 MLD of sewage, and nearly 21% was reported as remaining untreated in the city
reuse plan.
Existing sewage-treatment capacity of 221 MLD is planned to rise to 398 MLD, which would create
headroom above present sewage generation if plants operate effectively.
Identified reuse includes 5 MLD to Agra Cantt, Agra Fort and Idgah railway stations, 2 MLD to a Medical
College Metro corridor and 21 MLD toward Keetham Jheel.
These projects together operationalise about 28 MLD reuse potential with estimated investment of ₹93
crore.
Kanpur Example
The Bingawan Sewage Treatment Plant in Kanpur has capacity of 30 MLD and has operated since June 2023.
Watch and revise
Related YouTube explanation
Open topic-specific videos for “Safe Reuse of Treated Wastewater: 3% Reuse, 126.45 MLD Prayagraj Potential and India's Circular Water”. Prefer official, institutional or established UPSC education channels and verify dates before revising.
It was developed under the Hybrid Annuity Model and uses Sequential Batch Reactor technology.
HAM can improve lifecycle accountability because part of private payment is linked to operation and performance
rather than only construction.
Even where sewage is treated, reuse can remain low if distribution pipelines and buyers for treated water are
absent.
AMRUT 2.0 Targets
AMRUT 2.0 was designed to move toward universal urban water-supply coverage and 100%
sewerage/septage coverage in 500 AMRUT cities.
The mission envisaged 2.68 crore urban household tap connections benefiting around 10.7 crore people
and 2.64 crore sewer/septage connections benefiting around 10.6 crore people.
Recycle and reuse of treated wastewater is intended to meet about 20% of total city water needs and 40%
of industrial water demand under the mission vision.
City Water Balance Plans are a key circular-economy instrument for matching water sources, consumption, sewage
generation and reuse.
Circular Water Economy
A linear city extracts freshwater, uses it once, treats some sewage and discharges it; a circular city treats
wastewater to fit-for-purpose quality and reuses it.
Industrial cooling, construction, railways, landscaping and some agricultural uses often do not require
drinking-water quality.
Substituting treated wastewater in these sectors preserves higher-quality freshwater for households and
ecosystems.
Reuse also reduces nutrient and pollutant loads discharged into rivers.
Fit-for-Purpose Treatment
Water quality should match the end use: irrigation, cooling towers, construction and groundwater recharge have
different chemical and microbiological requirements.
Over-treating all wastewater to potable standards wastes energy and money; under-treatment creates health and
soil risks.
Standards must consider pathogens, salinity, heavy metals, nutrients and industrial contaminants.
Regular monitoring is essential because treatment-plant performance can fluctuate.
Economics of Reuse
A treatment plant without a reuse network may still discharge most treated water into a river; therefore, pipelines
and off-take contracts are part of the project, not an afterthought.
Tariffs must be attractive enough for industries to switch from freshwater while still covering operation and
distribution costs.
Long-term purchase agreements with power plants, railways or large industries can improve revenue certainty.
₹1,625 crore for 126.45 MLD in Prayagraj illustrates the capital intensity of building a reuse network, not
only the STP itself.
Groundwater Link
Industrial substitution of treated wastewater can reduce pressure on urban and peri-urban aquifers.
Managed aquifer recharge is possible in selected settings but requires stringent water-quality safeguards to avoid
contaminating groundwater.
Over-extraction can cause falling water tables, higher pumping energy and land subsidence in susceptible
geological settings.
Urban water security therefore requires integrated management of surface water, groundwater, rainwater and
treated wastewater.
Namami Gange Link
Safe reuse is being integrated with river rejuvenation because treated sewage that is productively reused does not
enter rivers as discharge.
City-Level Reuse Action Plans have been completed for Agra, Prayagraj and Varanasi under the Ganga framework.
By July 2026, the number of Ramsar wetlands within the Ganga Basin was reported to have reached 35, adding a
wetland-conservation dimension to river-basin planning.
Aviral Ganga relates to ecological flow; Nirmal Ganga relates to pollution reduction.
Health and Agriculture
Irrigation reuse can supply both water and nutrients, but untreated or poorly treated sewage can expose farmers
and consumers to pathogens and contaminants.
Salinity and sodium can degrade soil structure if unsuitable water is applied repeatedly.
Crop restrictions and irrigation methods can reduce exposure for certain reuse applications.
Public-health agencies and agriculture departments therefore need to participate in water-reuse regulation, not
only urban utilities.
Way Forward
Mandate city water-balance and reuse plans for water-stressed urban areas.
Create quality classes for different reuse purposes and publish continuous compliance data.
Build dedicated reuse pipelines alongside new STPs so treatment capacity automatically creates a marketable
water resource.
Use long-term industrial off-take contracts and rational freshwater pricing to make reuse financially viable.
Track litres of freshwater actually displaced, rather than reporting only MLD of treatment capacity.
Prelims Quick Revision
Baseline productive reuse cited by NITI Aayog: less than 1,000 MLD; about 3% of treated wastewater and
1% of wastewater generated.
AMRUT 2.0 vision: reuse can meet 20% of city water needs and 40% of industrial demand.
Probable Mains Question
India's urban wastewater challenge is increasingly an issue of resource recovery rather than disposal
alone. Examine the opportunities and safeguards required for a circular water economy.