NIT Rourkela Recycles 1,000L Daily, Cuts Water Use 90%

When COVID-19 hit and handwashing advisories flooded every corner of life, Professor Kasturi Dutta noticed something most of us missed: all that extra soapy water had to go somewhere. While the world focused on staying safe, she started asking where the surge of detergent-laden wastewater was ending up.

At the National Institute of Technology Rourkela, that question became a solution. Near the campus dhobi ghat (traditional laundry area), two large tanks now stand quietly doing remarkable work: turning up to 1,000 liters of dirty laundry water into clean, reusable greywater every single day.

The system cuts freshwater demand by 85 to 90 percent at the campus laundry facility. That matters more than it might sound because laundry wastewater carries surfactants, phosphates, and chemicals that can choke oxygen from rivers and lakes when released untreated.

Prof Dutta's journey to this moment started years before the pandemic. During postdoctoral research in Taiwan, she worked on municipal wastewater systems and helped develop reactors that both cleaned polluted water and generated biogas.

When she joined NIT Rourkela in 2015, she brought that vision with her. In 2023, CSR funding from the Higher Education Financing Agency gave her team the chance to build something real on campus.

The setup looks surprisingly simple: two black tanks connected by pipes beside the laundry area. Inside, though, it works like a carefully designed ecosystem called a constructed wetland-microbial fuel cell system.

Wastewater flows from an underground collection tank into treatment units where natural processes and microbial action break down pollutants. The system handles 300 liters in 24 hours and helps reuse between 500 and 1,000 liters daily depending on weather and evaporation.

The treated water meets Bureau of Indian Standards safety limits, with surfactants and chemical oxygen demand reduced to around 1 part per million. Students and staff can see it working in real time, not hidden away in some distant facility.

The Ripple Effect

Prof Dutta designed this as a medium-scale pilot precisely because most research jumps from tiny lab tests to massive city-wide systems with nothing in between. This bridge-sized solution can be replicated at other educational institutions, apartment complexes, or community laundry facilities facing water scarcity.

The campus dhobi facility uses about 1,400 liters daily. Before this system, much of that water simply flowed away, carrying its chemical load downstream.

Now it circulates back, easing pressure on freshwater sources during summer months when water scarcity hits hardest. The innovation addresses both pollution and conservation in one elegant loop.

What started as pandemic-era concern about increased detergent use has become a working model for sustainable water management. The system proves that wastewater doesn't have to be waste at all.