International
Chilean scientist plans to clean up mining with ‘metal eating’ bacteria
AFP
Starving microorganisms capable of surviving in extreme conditions have already managed to “eat” a nail in just three days.
In Chile, a scientist is testing “metal-eating” bacteria she hopes could help clean up the country’s highly-polluting mining industry.
In her laboratory in Antofagasta, an industrial town 1,100-kilometers north of Santiago, 33-year-old biotechnologist Nadac Reales has been carrying out tests with extremophiles — organisms that live in extreme environments.
Reales came up with her idea while still at university as she was conducting tests at a mining plant using microorganisms to improve the extraction of copper.
“I realized there were various needs in the mining industry, for example what happened with the metallic waste,” she told AFP.
Some metals can be recycled in smelting plants but others, such as HGV truck hoppers that can hold 50 tons of rock, cannot and are often discarded in Chile’s Atacama desert, home to the majority of the country’s mining industry.
Chile is the world’s largest producer of copper, which accounts for up to 15 percent of the country’s GDP, resulting in a lot of mining waste that pollutes the environment.
In her research, Reales, who now runs her own company Rudanac Biotec, concentrated on iron-oxidizing bacteria called Leptospirillum.
She extracted the bacteria from the Tatio geysers located 4,200 meters above sea level, some 350 kilometers from Antofagasta.
The bacteria “live in an acidic environment that is practically unaffected by relatively high concentrations of most metals,” she said.
“At first the bacteria took two months to disintegrate a nail.”
But when starved, they had to adapt and find a way of feeding themselves.
After two years of trials, the result was a marked increase in the speed at which the bacteria “ate,” devouring a nail in just three days.
– Surprising benefit –
Reales says “chemical and microbiological tests” have proved the bacteria are not harmful to humans or the environment.
“We’ve always seen a lot of potential in this project that has already passed an important test in the laboratory,” said Drina Vejar, a microbiologist who is part of a four-person team working with Reales.
“It’s really necessary at this time when we have to plan for a more sustainable development, especially in all these cities with so many polluting industries.”
Mining companies have shown interest in the research but while Rudanac Biotec previously benefitted from a state fund for start-ups, the company needs investment to move on to its next stage of trials.
Reales says she needs money to see if her method will “eat a medium sized beam or a hopper.”
When the disintegration process is complete, what remains is a reddish liquid residue, a solution known as a lixiviant that itself possesses a surprising quality.
“After biodisintegration the product generated (the liquid) can improve the recovery of copper in a process called hydrometallurgy,” said Reales.
Essentially, the liquid residue can be used to extract copper from rock in a more sustainable manner than the current use of chemicals in leaching.
Reales says it means green mining is “totally feasible.”
That is of great interest to mining companies that could use it to improve their large scale extraction of copper or other minerals, while also reducing their pollution, something they are required to do by law.
Reales recently submitted a request for an international patent for her technology, but more importantly she hopes it will help reduce metal waste blotting the landscape in the mining regions of her country.
International
Trump urges Putin to reach peace deal
On Monday, U.S. President Donald Trump reiterated his desire for Russian President Vladimir Putin to “reach a deal” to end the war in Ukraine, while also reaffirming his willingness to impose sanctions on Russia.
“I want to see him reach an agreement to prevent Russian, Ukrainian, and other people from dying,” Trump stated during a press conference in the Oval Office at the White House.
“I think he will. I don’t want to have to impose secondary tariffs on Russian oil,” the Republican leader added, recalling that he had already taken similar measures against Venezuela by sanctioning buyers of the South American country’s crude oil.
Trump also reiterated his frustration over Ukraine’s resistance to an agreement that would allow the United States to exploit natural resources in the country—a condition he set in negotiations to end the war.
International
Deportation flight lands in Venezuela; government denies criminal gang links
A flight carrying 175 Venezuelan migrants deported from the United States arrived in Caracas on Sunday. This marks the third group to return since repatriation flights resumed a week ago, and among them is an alleged member of a criminal organization, according to Venezuelan authorities.
Unlike previous flights operated by the Venezuelan state airline Conviasa, this time, an aircraft from the U.S. airline Eastern landed at Maiquetía Airport, on the outskirts of Caracas, shortly after 2:00 p.m. with the deportees.
Interior Minister Diosdado Cabello, who welcomed the returnees at the airport, stated that the 175 repatriated individuals were coming back “after being subjected, like all Venezuelans, to persecution” and dismissed claims that they belonged to the criminal organization El Tren de Aragua.
However, Cabello confirmed that “for the first time in these flights we have been carrying out, someone of significance wanted by Venezuelan justice has arrived, and he is not from El Tren de Aragua.” Instead, he belongs to a gang operating in the state of Trujillo. The minister did not disclose the individual’s identity or provide details on where he would be taken.
International
Son of journalist José Rubén Zamora condemns father’s return to prison as “illegal”
The son of renowned journalist José Rubén Zamora Marroquín, José Carlos Zamora, has denounced as “illegal” the court order that sent his father back to a Guatemalan prison on March 3, after already spending 819 days behind barsover a highly irregular money laundering case.
“My father’s return to prison was based on an arbitrary and illegal ruling. It is also alarming that the judge who had granted him house arrest received threats,” José Carlos Zamora told EFE in an interview on Saturday.
The 67-year-old journalist was sent back to prison inside the Mariscal Zavala military barracks on March 3, when Judge Erick García upheld a Court of Appeals ruling that overturned the house arrest granted to him in October. Zamora had already spent 819 days in prison over an alleged money laundering case.
His son condemned the situation as “unacceptable”, stating that the judge handling the case “cannot do his job in accordance with the law due to threats against his life.”
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