Current Affairs

HAND HELD WATER PURIFIER

The research: by IISc

Developing a technology to filter extremely dirty water, that can be encased in a small, portable device and runs on very little power.

Overview

  • There are plenty of technologies available in the market to treat water. But most of them are capable of treating only tap water and are either membrane-based or use chemicals.
  • In remote villages or areas hit by natural disasters, ponds and wells still remain the primary source of water, but this is not fit for drinking.
  • Traditional water-treatment technologies are not designed to treat very dirty or waste water.
  • Membranes need to be changed and chemicals must be disposed of in a safe manner.

Principle

Filter based membrane less chemical free technology.

Scientists used electric fields to achieve the objective. When an electric field is established in a container with water, the impurities and small particles get polarised and are then attracted to each other. Smaller particles coalesce into larger granules while remaining suspended in water. These granules can then be filtered easily, using a normal tea filter or a clean cloth.

Analysis

  • There was no new physics to the experiment that we performed, as the problem was essentially an engineering issue.
  • The key was to understand how electric fields permeate ion rich fluids and how they interact with neutral impurities.
  • This understanding helped scientists identify the field strengths needed to maximise this interaction and then use this concept to improve the filtration process.

Advantages

  • They have managed to develop a technology that can convert very dirty water — from ponds, lakes, wells and even waste water — into drinkable quality.
  • Unlike in the traditional filtration technologies, there is zero wastage of water. In fact, even the waste water can be reused.
  • The entire instrument can be encased in a one-litre bottle and needs very little power to run, either a battery or hand-held dynamo(solar cel- only l00 milli watts of power ) will serve the purpose.

Hand Held Water Purifier

The research: by IISc

Developing a technology to filter extremely dirty water, that can be encased in a small, portable device and runs on very little power.

Overview

  • There are plenty of technologies available in the market to treat water. But most of them are capable of treating only tap water and are either membrane-based or use chemicals.
  • In remote villages or areas hit by natural disasters, ponds and wells still remain the primary source of water, but this is not fit for drinking.
  • Traditional water-treatment technologies are not designed to treat very dirty or waste water.
  • Membranes need to be changed and chemicals must be disposed of in a safe manner.

Principle

Filter based membrane less chemical free technology.

Scientists used electric fields to achieve the objective. When an electric field is established in a container with water, the impurities and small particles get polarised and are then attracted to each other. Smaller particles coalesce into larger granules while remaining suspended in water. These granules can then be filtered easily, using a normal tea filter or a clean cloth.

Analysis

  • There was no new physics to the experiment that we performed, as the problem was essentially an engineering issue.
  • The key was to understand how electric fields permeate ion rich fluids and how they interact with neutral impurities.
  • This understanding helped scientists identify the field strengths needed to maximise this interaction and then use this concept to improve the filtration process.

Advantages

  • They have managed to develop a technology that can convert very dirty water — from ponds, lakes, wells and even waste water — into drinkable quality.
  • Unlike in the traditional filtration technologies, there is zero wastage of water. In fact, even the waste water can be reused.
  • The entire instrument can be encased in a one-litre bottle and needs very little power to run, either a battery or hand-held dynamo(solar cel- only l00 milli watts of power ) will serve the purpose.

 

Question:

Explain the working and advantages of Hand Held Water Purifier?

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