#WaterWatch

Reverse osmosis water is purer than our tap water - engineering professor

On Friday the TimesLive reported that seventeen years of work aimed at purifying mine wastewater could start paying off close to home for the University of Cape Town.

Professor Alison Lewis, Dean of Engineering and the Built Environment at the University of Cape Town (UCT) says all of this work has been done by post-graduate students who studied at UCT.

What's really cool about it, is you take your mine water and drop the temperature to a point where the water in the brine freezes out as pure ice and because it's lighter, water will float.

Prof. Alison Lewis, Dean of Engineering and the Built Environment at the University of Cape Town (UCT)

And the contaminates in the water will crystallise out as pure salt and because they are heavier than water, will sink.

Prof. Alison Lewis, Dean of Engineering and the Built Environment at the University of Cape Town (UCT)

So you have a very simple conceptual separation process with ice floating and the salt sinking, almost deconstructing the decontaminated water, adds Lewis.

Lewis explains that should Cape Town opt for desalination then the city needs to bear in mind that reverse osmosis is very inefficient.

What you're doing is, you're pumping the salty sea water through a very fine membrane that will reject the salt on one side and recover the water on the other. Its only 40% efficient.

Prof. Alison Lewis, Dean of Engineering and the Built Environment at the University of Cape Town (UCT)

But, reverse osmosis water is purer than our tap water says Lewis.

Listen here:


This article first appeared on 702 : Reverse osmosis water is purer than our tap water - engineering professor


Recommended

by NEWSROOM AI

CapeTalk welcomes all comments that are constructive, contribute to discussions in a meaningful manner and take stories forward.

However, we will NOT condone the following:

  • Racism (including offensive comments based on ethnicity and nationality)
  • Sexism
  • Homophobia
  • Religious intolerance
  • Cyber bullying
  • Hate speech
  • Derogatory language
  • Comments inciting violence.

We ask that your comments remain relevant to the articles they appear on and do not include general banter or conversation as this dilutes the effectiveness of the comments section.

We strive to make the CapeTalk community a safe and welcoming space for all.

CapeTalk reserves the right to: 1) remove any comments that do not follow the above guidelines; and, 2) ban users who repeatedly infringe the rules.

Should you find any comments upsetting or offensive you can also flag them and we will assess it against our guidelines.

CapeTalk is constantly reviewing its comments policy in order to create an environment conducive to constructive conversations.

Read More
[LISTEN] The Naked Scientist explains how coffee may reduce your mortality rate

[LISTEN] The Naked Scientist explains how coffee may reduce your mortality rate

Chris Smith also reveals fascinating facts about the hippos closest living relative.

Behavioural change in the home is key to saving water

Behavioural change in the home is key to saving water

Government and private sector's round table on #WaterWatch is an attempt to find solutions to the country's water problems.

Flush buddy could save Cape Town 40 to 60 million liters of water

Flush buddy could save Cape Town 40 to 60 million liters of water

A Kuils River trio has come up with a product which they say could potentially save 2 litres of water with every toilet flush.

Car washes urged to go water less due to drought

Car washes urged to go water less due to drought

Mayor Patricia de Lille has met with car washes about water-efficient behaviour and introducing water less products.

Finally City of CT to install water management devices for water guzzlers

Finally City of CT to install water management devices for water guzzlers

After failed attempts to reduce water usage, stricter measures will be imposed for the offenders in the City of Cape Town.

Popular articles
Can you 'affair-proof' your marriage?

Can you 'affair-proof' your marriage?

Sexologist Nikki Goldstein says there are steps you can take to cut the risk of infidelity in your relationship.

Stadium riot: 'It's just inexplicable and unacceptable by all means'

Stadium riot: 'It's just inexplicable and unacceptable by all means'

Minister of Sports and Recreation condemns this weekend's violence by Kaiser Chiefs fans.

'He raped me every day for a year when I was 8 years old'

'He raped me every day for a year when I was 8 years old'

A woman has penned her triumphant story of survival after being sexually abused by an uncle as a child.

Euphonik (one of South Africa's top DJs) opens up about money

Euphonik (one of South Africa's top DJs) opens up about money

Bruce Whitfield talks to Euphonik (aka Themba Nkosi) about his attitude to money (hopes and fears, successes and failures, etc.)

This is how much you should be paying your domestic worker

This is how much you should be paying your domestic worker

Stephen Rathai, director of employment standards at the Department of Labour talks on the new national minimum wage.

Madiba’s private secretary Zelda la Grange opens up about money (hers and his)

Madiba’s private secretary Zelda la Grange opens up about money (hers and his)

Bruce Whitfield interviews La Grange about her and Madiba's attitude to money (hopes and fears, successes and failures, etc.)

Mugg & Bean agrees to pay medical bill of customer

Mugg & Bean agrees to pay medical bill of customer

Mugg & Bean has agreed to pay for customers medical bills after a month of being in pain and pestering the chain to pay the bill.