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Waste can be turned into an economic opportunity, says an Indian-Australian Scientist Veena Sahajwalla

The two-day event that addressed the need to develop the scrap recycling industry in India saw participation by over 280 delegates from the scrap and steel industry

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E-waste. Image source: Wikimedia Commons

New Delhi, Sept 11, 2016: An Indian-Australian scientist who has been looking for ways to transform waste into something useful, said here on Saturday that non-metallic waste can be turned into new economic opportunity.

“We can either consider non-metallic waste as an environmental burden or turn it into a brand new economic opportunity,” Veena Sahajwalla, Director at the Centre for Sustainable Materials Research and Technology at the University of New South Wales in Australia, said.

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Veena Sahajwalla. Pic from Twitter account.
Veena Sahajwala. Pic from Twitter account.

Sahajwalla, who invented Polymer Injection Technology (PIT) that can be used to recycle end-of-life rubber tyres to replace coal and coke in making a green steel, was speaking at “Scrap Recycling Conference – Emerging Markets”.

The two-day event that addressed the need to develop the scrap recycling industry in India saw participation by over 280 delegates from the scrap and steel industry.

“Green steel could be a potential solution deal with the growing problem of disposal of waste tyres globally,” Sahajwalla added.

The PIT or “green steel” technology introduces a simple modification into the conventional manufacturing process for steel precisely and controls the injection of granulated waste tyres in conventional electric arc furnace (EAF) steel making, partially replacing non-renewable coke.

Waste tyres, like coke, are good sources of hydrocarbons. This means they can be usefully transformed in EAF steel making, as long as the process of injecting them into the furnace is precisely calibrated.

However, though modern tyres are fundamentally rubber products, they are a complex mix of natural and synthetic rubbers, and various structural reinforcing elements such as metals and chemical additives, which makes the recycling process more complicated from the traditional methods.

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This complex nature of wastes has also led to stockpiling, dumping and diversion to landfill, exposing people to environmental and health risks.

“So from the traditional reduce, recycle and reuse one has to move towards reforming. It’s the transformation of waste to higher value products,” Sahajwalla noted.

In addition, the waste stocks are full of materials that contain valuable elements like carbon, hydrogen, silicon and metals that we would otherwise source from virgin raw materials.

The technology may not only help control pollution but also open several avenues for metal and scrap processors in India, Sahajwalla said. (IANS)

  • Manthra koliyer

    This can surely help us destroy all the debris.

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Scientist Who Coined the Term ‘Global Warming’ Dies at 87

"His discoveries were fundamental to interpreting Earth's climate history," said Oppenheimer.

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Scientist, Global Warming
FILE - U.S. professor Wallace Broecker poses during a meeting at the Lincei Academy where he is receiving the Balzan 2008 Award in Rome, Nov. 21, 2008. VOA

A scientist who raised early alarms about climate change and popularized the term “global warming” has died. Wallace Smith Broecker was 87.

The longtime Columbia University professor and researcher died Monday at a New York City hospital, according to a spokesman for the university’s Lamont-Doherty Earth Observatory. Kevin Krajick said Broecker had been ailing in recent months.

Broecker brought “global warming” into common use with a 1975 article that correctly predicted rising carbon dioxide levels in the atmosphere would lead to pronounced warming. He later became the first person to recognize what he called the Ocean Conveyor Belt, a global network of currents affecting everything from air temperature to rain patterns.

“Wally was unique, brilliant and combative,” said Princeton University professor Michael Oppenheimer. “He wasn’t fooled by the cooling of the 1970s. He saw clearly the unprecedented warming now playing out and made his views clear, even when few were willing to listen.”

In the Ocean Conveyor Belt, cold, salty water in the North Atlantic sinks, working like a plunger to drive an ocean current from near North America to Europe. Warm surface waters borne by this current help keep Europe’s climate mild.

Otherwise, he said, Europe would be a deep freeze, with average winter temperatures dropping by 20 degrees Fahrenheit or more and London feeling more like Spitsbergen, Norway, which is 600 miles north of the Arctic Circle.

Broecker said his studies suggested that the conveyor is the “Achilles heel of the climate system” and a fragile phenomenon that can change rapidly for reasons not understood. It would take only a slight rise in temperature to keep water from sinking in the North Atlantic, he said, and that would bring the conveyor to a halt. Broecker said it is possible that warming caused by the buildup of greenhouse gases could be enough to affect the ocean currents dramatically.

Scientists, Global Warming
FILE – Climate scientist Wally Broecker of New York’s Columbia University addresses the audience during the Rome ceremony at which he was awarded a Balzan Prize for outstanding scientific achievement, Nov. 21, 2008. VOA

“Broecker single-handedly popularized the notion that this could lead to a dramatic climate change ‘tipping point’ and, more generally, Broecker helped communicate to the public and policymakers the potential for abrupt climate changes and unwelcome ‘surprises’ as a result of climate change,” said Penn State professor Michael Mann.

In 1984, Broecker told a House subcommittee that the buildup of greenhouse gases warranted a “bold, new national effort aimed at understanding the operation of the realms of the atmosphere, oceans, ice and terrestrial biosphere.”

“We live in a climate system that can jump abruptly from one state to another,” Broecker told the Associated Press in 1997. By dumping into the atmosphere huge amounts of greenhouse gases, such as carbon dioxide from the burning of fossil fuels, “we are conducting an experiment that could have devastating effects.”

“We’re playing with an angry beast — a climate system that has been shown to be very sensitive,” he said.

Broecker received the National Medal of Science in 1996 and was a member of the National Academy of Science. He also served a stint as the research coordinator for Biosphere 2, an experimental living environment turned research lab.

Broecker was born in Chicago in 1931 and grew up in suburban Oak Park.

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He joined Columbia’s faculty in 1959, spending most of his time at the university’s laboratory in Palisades, New York. He was known in science circles as the “Grandfather of Climate Science” and the “Dean of Climate Scientists.”

“His discoveries were fundamental to interpreting Earth’s climate history,” said Oppenheimer. “No scientist was more stimulating to engage with: he was an instigator in a good way, willing to press unpopular ideas, like lofting particles to offset climate change. But it was always a two-way conversation, never dull, always educational. I’ll miss him.” (VOA)