Cheap & indigenous adsorbents based approach to drinking water purification

The idea of this project is to look for the alternatives of expansive absorbents like activated carbon and other purification methods like RO. One way of doing this is to use indigenous substances like rice husk, neem leaves for adsorbing the impurities. The project mainly aim at making a list of such substances, testing them and finally come out with DIY(Do-It-Yourself) type of manual that can guide any literate person to make an efficient water filter by just using the available resources around him.

The project is divided in 3 phases. The first phase which has been completed focused on doing an extensive study of research papers available and developing a database of all the indigenous and cheap substances which can act as a potential adsorbent. In the second phase we are currently testing 5 such substances (Rice husk, Egg shells, Wheat barn, neem leaves, coconut husk) in lab for their effectiveness in removing common impurities like fluoride. In the final phase we would use the most effective of these tested adsorbents in designing a cheap and compact water filter.

Electricity from waste heat of gas stove

This is the most recent project taken up by Parishodh Pilani team. The aim of the project is to utilize waste heat from a flame of gas stove and convert it into electricity using a thermoelectric effect. This project is vey feasible considering as much as 50% of heat produced from stove is wasted while cooking and also hand there is a huge shortage of electricity in our country forcing my towns and villages to spend nights in darkness. The electricity produced from this model can be stored using batteries and can be later used for lighting and other purposes.

Work would be done mainly on increasing efficiency, reducing costs and improving design so that it can be easily incorporated in any gas stove.

Rope Pump


The aim of this project is to completely develop an economical and portable storage system for biogas (in modular form) to be used for kitchen purposes. This will provide a fuel solution to a large section of the rural population, while making use of a renewable energy source. It involves:

  1. Enhancement of biogas quality in least possible cost such that it is sufficient for storage and use in kitchen. This consists of Wobble number optimization and heat capacity enhancement.

  2. An economic pumping mechanism for storing the sufficiently enhanced gas into acceptable volumes.

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