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WATER WORLD
Dirty tap water has Rio residents on edge
By Perrine Juan, Joshua Howat Berger
Rio De Janeiro (AFP) Feb 6, 2020

Many household drinking water filters fail to totally remove PFAS
Washington DC (UPI) Feb 05, 2020 - Most municipal water systems don't filter out PFAS, a unique class of toxic chemicals, leaving citizens to remove the pollutants on their own. Unfortunately, new research suggests the majority of household water filters fail to entirely remove PFAS from water.

Per- and polyfluoroalkyl substances, or PFAS, are a class of synthetic compounds used in a variety of industrial processes and found in dozens of household items. They have been linked to a variety of health problems, including cancer and high cholesterol, and a report published last month found the toxins are accumulating in municipal drinking water all over the United States.

For the latest study, published Wednesday in the journal Environmental Science and Technology Letters, scientists wanted to find out how well household water filters protect drinkers from these harmful toxins.

"We tested 76 point-of-use filters and 13 point-of-entry or whole-house systems and found their effectiveness varied widely," lead researcher Heather Stapleton, professor of environmental health at Duke University, said in a news release.

"All of the under-sink reverse osmosis and two-stage filters achieved near-complete removal of the PFAS chemicals we were testing for," Stapleton said. "In contrast, the effectiveness of activated-carbon filters used in many pitcher, countertop, refrigerator and faucet-mounted styles was inconsistent and unpredictable. The whole-house systems were also widely variable and in some cases actually increased PFAS levels in the water."

Scientists tested water samples, before and after filtration, at homes in central and southeastern North Carolina. The tests screened for the presence of 16 different PFAS. There are 600 PFAS compounds currently being used by various industries, but the chemicals that are most prevalent in the environment -- and feature the most well-documented toxicity -- mostly originate from fire-fighting foams and stain- and water-repellents.

Because the chemical bonds in these unique human-made chemicals are so strong, they don't degrade. Natural processes don't break them down, which is why they're sometimes called "forever chemicals." They persist in the environment, and also in human blood.

"Certain ones stick to proteins in our blood," Rick Rediske, professor at the Annis Water Resources Institute in Michigan, told UPI last month. "DDT and pesticides go in to our fat. Lead goes into our bones. Mercury goes into muscle. Because PFAS are carried around in our blood and aren't discarded, they naturally concentrate over time. And they attach to the proteins that carry antibodies, cholesterol and hormones, that's why you get so many different health effects caused by these compounds."

The study carried out by Duke researchers showed the best ways to remove PFAS from drinking water at home is to use either reverse osmosis or two stage filters. The two techniques removed 94 percent of PFAS, while activated-carbon filters removed an average of 74 percent of PFAS.

"The under-sink reverse osmosis filter is the most efficient system," Knappe said. "Unfortunately, they also cost much more than other point-of-use filters. This raises concerns about environmental justice, since PFAS pollution affects more households that struggle financially than those that do not struggle."

First the water was dirty, then it was full of detergent: Rio de Janeiro residents have had some disturbing stuff coming out of their taps, the latest environmental bungle for Brazil.

The problem started a little over a month ago, with widespread complaints of stinky, brown tap water in the "Marvelous City," which is known for the breathtaking beauty of its beaches, but also a history of polluting and mismanaging its water.

The public water utility, a much-maligned company called Cedae, said the issue was a harmless organic compound called geosmin. It fired the head of the city's main water treatment plant, used carbon particles to reduce the geosmin and assured the greater metropolitan area's 12 million inhabitants their water was safe to drink.

But then it had to make another embarrassing announcement Monday: high levels of detergent from an unknown source had been found in the same water treatment plant, forcing authorities to shut it down.

The plant, known as Guandu, serves nine million people. The 13-hour shut-down left large swathes of the city with no tap water, in the middle of a sweltering southern-hemisphere summer.

As panic buying has set in, bottled water suppliers have struggled to keep up with demand.

"Deliveries have quadrupled. And everyone wants water right this minute," said Luciana de Barbosa de Jesus, owner of a wholesale supplier in the city center, as her delivery staff rushed to fill trucks and bicycle carts with huge orders of bottles and jugs.

- Schools closed, carnival questioned -

The water shut-off forced authorities to push the start of the school year back from Wednesday to Thursday for more than 1,500 public schools.

It has also raised concerns about the city's world-famous carnival in two weeks' time, when some two million tourists will flock to Rio.

"If we don't solve this problem fast, we could be holding carnival with a shortage of bottled water, forcing people to drink (tap) water that might not be safe," said Leonardo Do Santos, a 38-year-old banker, as he stocked up on water in the central business district.

Bottled water is already becoming hard to find.

Many supermarkets have run out or are limiting customers' purchases. On the street, vendors have as much as tripled the price of a 1.5-liter bottle, to six reals (nearly $1.50).

Residents are even turning to bottled water in the city's poorest neighborhoods, the favelas, despite the economic sacrifice.

"A lot of people are buying bottled water here. They're already running out of 20-liter jugs in some places," said Helio, a resident of the sprawling Mare favela.

- Politics and punchlines -

It is the latest bad environmental PR for Brazil, home to the world's largest freshwater supply and 60 percent of the vital Amazon rainforest, where deforestation nearly doubled last year.

Environmentalists accuse far-right President Jair Bolsonaro, a climate-change skeptic, of attacking the Amazon with his pro-business, pro-farming policies.

Rio de Janeiro state Governor Wilson Witzel, a fellow far-right politician, now faces similar criticism for his management of Cedae, which he wants to privatize.

Critics accuse the governor of dismantling the utility to pave the way for privatization.

The state's environmental regulator announced Wednesday it had fined Cedae 100,000 reals for failing to disclose test results on geosmin levels at the Guandu plant.

Cedae told AFP it had asked for an extension to complete the tests.

"The water supplied by Cedae meets health ministry standards and is therefore safe to drink," it said in an email.

The utility's problems are not new, said ecologist Mario Moscatelli, who has been urging authorities since the 1990s to deal with massive amounts of raw sewage dumped just upstream from the Guandu plant.

"That situation is inconceivable and unacceptable, anywhere in the universe," he told AFP.

Cedae did score a victory of sorts Wednesday, when environmental authorities ruled the mystery detergent found in the treatment plant did not exceed acceptable limits.

But the news did little to calm worried residents -- or stop a flood of jokes about the situation.

"Witzel found a 'smart' way to clean the water: add detergent," quipped one Twitter user.

"Now it comes out of the tap foaming, and we save on dish soap what we spend on bottled water."


Related Links
Water News - Science, Technology and Politics


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WATER WORLD
Water, water everywhere - and it's weirder than you think
Tokyo, Japan (SPX) Feb 05, 2020
Researchers at The University of Tokyo have used computational methods and analysis of recent experimental data to demonstrate that water molecules take two distinct structures in the liquid state. The team investigated the scattering of X-ray photons through water samples and showed a bimodal distribution hidden under the first diffraction peak that resulted from tetrahedral and non-tetrahedral arrangements of water molecules. This work may have important implications throughout science, but espe ... read more

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