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In the sanitation sphere, Waste-to-Value (WTV) refers to a system that converts human waste into outputs of value, such as energy, fertilizer, or other byproducts. 

  • Human waste that has been properly composted can provide a nutrient-rich soil amendment for agriculture purposes

  • Methane, generated as a byproduct of the decomposition of excreta can be used for generating cooking gas and energy generation

  • Excreta can be collected and sold to produce energy commercially, with biochar, a potent fertilizer, being produced as a by-product of burning. 

To realize the full health and economic benefits of sanitation, the entire Sanitation Value Chain must be considered, from toilet use, collection, transportation, treatment, and disposal. Waste-to-Value supports opportunities throughout the entire Sanitation Value Chain.


By creating value for the user, an incentive is built for the toilets to be used and maintained.  Waste-to-Value technologies can also reduce water-borne vector transmission, environmental degradation and human exposure to untreated excreta

Why is Waste-to-Value important ?

Our Waste to Value Technology

Integral to the Aerosan HUB model is our anaerobic digester (a biogas plant) that is directly fed by the toilet waste.  Aerosan’s anaerobic digester contains and treats waste more cost-effectively than conventional pit latrines because biogas plants have low maintenance costs and are constructed with local expertise and resources making them affordable and feasible long term.

Aerosan HUB biogas plants are constructed underground, saving space in urban regions. Local expertise and materials are used. 

Aerosan was the first in Nepal to generate biogas directly from public toilet waste. Since it was established in March 2018, our pilot continues to produce biogas for a nearby teashop, for up to 16 hours a day, replacing 2 cylinders of LPG a month, reducing the costs of an expensive imported source of fuel.

Each Aerosan HUB prevents 40 tonnes of waste per annum from being dumped into the region's fresh rivers and lakes.

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