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Since
the 1940s, per- and polyfluoroalkyl substances — more commonly known as PFAS —
have been leaching into the soil, the groundwater,
and our bodies. PFAS pollution is now so
widespread that the chemicals are estimated to be present in 99 percent of Americans’ bloodstreams.
Researchers have even found them in the bodies of polar bears.
“It’s
just crazy,” said Michael Wong, a chemical engineer at Rice University.
“There’s an urgent need to clean up this mess right now.”
The
research centered around a process called photocatalysis — a chemical reaction
in which tiny, semiconductive particles are suspended in contaminated water and
“excited” by ultraviolet light. With the right kind of particles, that reaction
can be strong enough to degrade the durable carbon-fluorine bonds of PFAS.
Other
chemical engineers had previously used photocatalysis to break down PFAS, Wong
said. “But they couldn’t break it down as quickly as we can.”
In
his experiment, Wong and his team ground BN into a fine powder and placed it
into a container of water that was contaminated with PFOA. They then exposed
the water to ultraviolet light, which caused small deformations to appear in
the BN — “tiny little holes,” as Wong put it. The deformations made the BN
reactive enough to quickly break down most of the PFOA into benign byproducts,
mostly carbon dioxide and fluoride salt — “like the fluoride in our toothpaste,”
Wong said.
Wong
was surprised the BN worked at all, let alone so efficiently — he had included
BN alongside a series of more promising photocatalysts as the “control,” the
part of the experiment that is expected to show no results. “It wasn’t supposed
to work,” Wong said. BN’s electrons should have required too much energy to be
excited by the ultraviolet light. In the research paper, Wong wrote that atomic
defects in the BN — a result of grinding — may have enabled it to absorb the
light and become reactive.
Before
Wong’s study, no one knew BN could be used as a photocatalyst for PFOA
degradation. “In terms of this mechanism, it’s really novel,” said Jinyong Liu,
an assistant professor of chemical engineering at the University of California,
Riverside who was not involved in Wong’s study.
Ezra
Cates, a Clemson University environmental engineer who was also uninvolved in
Wong’s study, said the BN research “puts another tool in the toolbox” for
researchers seeking to clean up PFAS. However, he noted, it isn’t necessarily
more promising than competing avenues of research, including zapping PFAS with diamond-coated electrodes or blasting them with plasma. Plus, he said,
there’s still the problem of incomplete degradation —many of these techniques,
including photocatalysis, are only efficient at breaking down the largest PFAS,
which are chains of eight or more carbon molecules, into smaller-chain
compounds that are still harmful to human health. (Wong said that
photocatalysis might still be able to break these smaller PFAS down; it just
might take much longer than four hours.)
According
to Cates, if scientists’ goal is to treat municipal drinking water, any of
these PFAS-destroying techniques will likely be integrated into a multi-step
process that begins with adsorption — sucking up the longest-chain PFAS onto a
sticky membrane. Then, rather than the current most common technique of
incinerating the concentrated PFAS at temperatures above 1,000 degrees C (1,832 degrees F),
environmental engineers could eliminate the chemicals with photocatalysis,
plasma, or electrochemical methods — whichever winds up being most efficient.
Wong
is optimistic that he will find a commercial use for the BN technique. Since
publishing his paper, he has been approached by a nanotechnology water
treatment research center at Rice University, and he says he’s already begun
filing patents. He suspects BN may be able to break down other PFAS beyond
PFOA, and he has already demonstrated limited success with a prevalent PFAS
compound called GenX. He also thinks he can make the degradation process go
much faster — somewhere on the order of one hour, he told Grist.
Figuring
out how to destroy PFAS quickly and cheaply, Wong said, would have real-world
implications for the many communities affected by unsafe chemical exposure.
Between 2013 and 2015, as many as 6 million Americans were routinely
exposed to PFAS levels exceeding the EPA’s safety guidelines. “We want to do
right by people,” he explained. “This is a way that I envision we can be
helpful as engineers.”
Apple
snail eggs are a common sight in area marshes. [The Courier and Daily
Comet/File]
By
Tristan Baurick / Times-Picayune | New Orleans Advocate
Posted
Jul 19, 2020 at 7:08 PM
First it came for your wetlands. Now it’s
coming for your crawfish and your rice.
A foreign snail that appeared in Louisiana just
over 10 years ago and quickly infested ponds, bayous and streams in about 30
parishes has recently found its way to the farms that produce two of the
state’s favorite foods.
The invasive apple snail has shut down harvest
at some crawfish farms in Vermilion, Acadia and Jefferson Davis parishes and
has made its first devastating appearance in rice fields. In March, the
invasive mollusks wiped out a 50-acre field of rice, marking the first reported
case of the snail damaging the crop in Louisiana.
“Where it’s hit ’em, it’s hit ’em hard,” said
David Savoy, a Church Point crawfish farmer and chairman of the Louisiana
Crawfish Promotion and Research Board. “In Vermilion, it’s so bad, you pick up
a trap and there’s 5 to 10 pounds of them. It’s horrible.”
Attracted by the bait in traps, the snails
crowd in, leaving little or no room for crawfish. At some farms, apple snails
are being caught in such high numbers — sometimes 12 crates per day — that
disposal of the thick-shelled snails is becoming a problem.
Some farmers have had to halt harvests and
drain their ponds early, suffering revenue reductions of as much as 50%, said
Blake Wilson, an LSU AgCenter researcher.
“The impact on some of those farms,
particularly where snail populations have been building for years, has been
immense,” he said.
Only about 10 crawfish farms have been
affected, but new reports keep coming in.
Louisiana is by far the nation’s biggest
crawfish producer. The industry contributes more than $300 million to the state
economy each year and employs about 7,000 people, according to the research
board.
“If the problem spreads to the whole industry,
economic impacts could be tens of millions of dollars annually without
effective control tactics,” Wilson said.
Those tactics are currently limited to
pesticides. But what kills snails will also likely kill crawfish.
Native to South America, the apple snail’s
first appearance in Louisiana was in a Gretna drainage canal in 2006.
They’re popular in the aquarium trade partly
because they eat the algae that dirties tanks. But they get quite big —
sometimes growing shells 6 inches in diameter — and they often have a strong,
swampy odor. Their presence in the wild is likely due to aquarium owners
dumping them in ditches and ponds.
The snails stay below the water’s surface and
aren’t often seen, but their bubblegum pink eggs are hard to miss. In clusters
of 200 to 600, the tiny eggs have become an all-too-common sight on tree trucks
and pilings just above the water line. Destroying the eggs is one of the best
ways to reduce their numbers.
The state Department of Wildlife and Fisheries
recommends people scrape the eggs off with a stick and crush them, or at least
knock them into the water. Be careful not to touch them because the eggs
contain a neurotoxin that can irritate skin and eyes.
The snails are edible but are known to carry
rat lungworm, a parasite that can kill humans and other mammals.
Rapid reproducers and voracious eaters, the
snail overpopulates waterways and kills off habitat important to native fish
and other wildlife.
The snail’s appearance in crawfish farms comes
at a particularly bad time for the industry. Crawfish have been hit with white
spot syndrome, a deadly virus that was first discovered in farmed shrimp in
Asia in the early 1990s and first appeared in Louisiana 2007.
The coronavirus pandemic has taken a toll as
well. The AgCenter reported that some crawfish producers have been able to sell
just 15% of their catch due to pandemic-related restaurant closures and
occupancy limits.
Scientists and farmers are perplexed about how
the snail arrived in crawfish farms and why certain farms are swarming with
them.
“It’s weird,” AgCenter researcher Greg Lutz
said. “It pops up in certain regions. You can have a farm with nothing, and
three or four miles down the road they’re overrun.”
It could be that the snails benefit from
flooding. An Acadia Parish farm started having a snail problem after its fields
were flooded from a bayou linked to the Mermentau River, which is loaded with
apple snails.
The snail has been identified in just one rice
field so far, but the potential for widespread destruction is strong. It’s a
major pest for rice growers in Spain, Asia and Central America. In the
Philippines, the snail is considered a national menace, infesting about half
the nation’s rice fields during the late 1980s.
The snail left almost nothing at the rice field
near Rayne. Wilson estimated the field had two snails per square foot.
“There was no trace of rice,” he said. “If you
didn’t know better, you’d think it was a snail production farm.”
"The
idea of a rice supply and price crisis in our poor country is quite worrisome."
About a month
ago, I read in a business paper that the tender for 300,000 metric tons of rice
done through a government-to-government purchase was put on hold, after winners
had been announced.
For the first
instance in as long a time as I could recall, even Myanmar participated, and
won, a portion of our staple reserve requirement. The bidding was conducted by
the Philippine International Trading Corporation (PITC), an agency attached to
the Department of Trade and Industry.
Earlier, the
Department of Agriculture certified to the need for importing a food security
reserve of 300,000 metric tons of rice, and since the Rice Tariffication Law
which was passed in 2019 removed that function from the National Food Authority
along with its commercial functions, the G2G mode of procurement was passed on
to the PITC.
The NFA can
only procure palay from local farmers, have it milled, and keep the same for
rice reserves to be used in times of emergency, with its buyers being the DSWD,
local government units, and other government agencies for relief purposes. Of
course, the implementing rules and regulations allowed for a phase-out of the
commercial functions of the food security agency. By now, NFA’s 2018-2019
imports must have been sold out. What NFA holds in its warehouses by this time
should either be rice milled from the palay it bought over the last 15 or so
months, or yet in palay form.
There was an
unexpected heavy buying from NFA due to the Covid lockdowns, when both the
national and local government units had to deliver food supplies to the
quarantined population.
With its 2019
and 2020 funds limited by the budget subsidy under the GAA, although augmented
in the Bayanihan emergency legislation, NFA could only procure so much. And at
its procurement price of 19 pesos per kilo, already adjusted from the previous
17 per kilo of palay, NFA had to compete with the private millers and traders
who, surprisingly (because government statistics claim we had plenty of stocks
imported by the privates in 2019 and the first quarter of 2020), were offering
higher prices for palay.
I read
somewhere online that NFA management proposed to hike their buying price to
P21, but the NFA Council did not approve.
Why would the
private traders buy the summer crop at higher prices, averaging P22 to P23 per
kilo, if they had so much unsold inventory from the massive quantitative
restriction-freed imports right after the NFA monopoly was lifted?
The higher
farm-gate prices somehow compensated our palay farmers from the massive losses
of the previous year when their main harvest was sold so low due to the
immediate impact of the RT Law, which is a good thing.
Still, we are
basically not self-sufficient in our rice consumption needs, and the Covid
pandemic resulted in a distorted supply-demand situation. Though rice has
inelastic demand, the unusual circumstances of the lockdown and its impact on
people’s daily lives must have increased overall consumption. Which is why the
DA’s proposal to import a modest 300,000 metric tons, about a nine-day national
consumption requirement, was conservatively proper.
There were some
worries when Vietnam, our main supplier of rice imports, announced that they
would stop exporting to ensure their food security needs amid the Covid
pandemic. But later, the Vietnamese prime minister assured our President that
they would be ready to supply the Philippines.
So the PITC
went into a country bidding process. But after announcing the winners, the
agency announced that it was suspending awards because of a lack of certification
of funds availability. NFA, when it was doing the importation of rice, could
avail itself of supplier credits which the seller country could re-finance
through a consortium of banks. In my time, we could get 270-day credit for
instance, from Vietnam.
We of course
understand that the Covid pandemic has drained the national treasury, and
revenue collections have gone down. But food security is a matter of national
security as well, and I thought that funds would soon be made available to
honor the bids already tendered and won.
The other day,
I found out that the whole procedure was cancelled. So now, we are totally
reliant on the private millers and traders, with our public warehouse, the NFA,
having an inventory equivalent to around seven days nationwide consumption.
Now, that is
worrisome. Not only because we went into government-to-government tenders and
then welched. More so because we may be entering the second half of the year
with world supply precarious.
China, the
world’s top rice producer followed by India, is experiencing the worst flooding
in its Yangtze River Basin since 1998. With the rains still pouring from the
heavens, the floods may worsen. Chongqing, Jiangxi, Hubei (birthplace of the
novel coronavirus), Jiangsu, Anhui, Hunan, and Zhejiang provinces are gravely
affected. Almost half of China’s annual rice production of some 205 million
metric tons come from these provinces.
The Three
Gorges Dam has released so much water to protect it from bursting as the water
levels from the Yangtze swell with more and more rainfall (they call it the
“plum rain”).
Now China
cannot and will not allow its food security imperiled by low domestic
production, and so it will import from other countries as necessary to feed its
huge population. Though figures are hard to come by in this era of the greatest
pandemic of our lifetime, the whole world’s production and consumption patterns
may also have been affected.
India now has
more than a million Covid cases. The ability of India to export rice may be
compromised. And every other rice-eating country will then be scrambling for
supplies from the top Asean exporters --- Vietnam, Thailand even Myanmar to a
lesser extent, just as we enter the typhoon season when shipping and logistics
management are difficult and our main crop won’t be harvested until
mid-September.
Then if La Nina
gets naughty when our main palay crop is about to be harvested, then we will
have a major crisis. And NFA is a castrated agency reduced to being a public
warehouse.
The Rice
Tariffication Law was in principle correct because government cannot forever
subsidize, and government monopolies create price distortions. But it was
hastily done in reaction to an inflationary spiral in 2018 that was caused by
mismanagement of supply by previously appointed officials, now thankfully
replaced by more competent persons.
These more
competent persons assure us that we have 89 days supply as we entered the lean
months. That is comforting. But 92 percent of these, again if the estimates are
correct, are in private hands.
Look at the
dangers of world supply, and sharpen your pencils, please.
In a world
discombobulated by disease, having a rice supply and price crisis in our poor
country is quite worrisome. I hope my fears are unfounded.
RICE traders and importers who have unused
sanitary and phytosanitary import clearance could be suspended by the
Department of Agriculture (DA) as about 60 percent of issued SPS-ICs in the
first half, covering almost 2 million metric tons (MMT), are unutilized to
date.
Latest
Bureau of Plant Industry (BPI) data obtained and analyzed by the BusinessMirror
showed that only 1,803 SPS-ICs out of the 3,926 SPS-ICs issued from January to
June have been used by eligible rice importers as of July 10.
This
corresponds to a total rice volume imported of about 1.347 MMT out of the 3.261
MMT applied volume during the six-month period, BPI data showed.
About
2,123 SPS-ICs, which cover 1.914 MMT of rice, are yet to be used by registered
and eligible traders, importers, firms, cooperatives, and organizations, based
on BPI data.
Agriculture
Secretary William D. Dar has issued a new memorandum order (MO) reminding
importers that “low utilization” of SPS-ICs could be “grounds for rejection of
application or their suspension as importer.” “Importers should regularly
account and surrender any unused SPS-ICs to BPI,” Dar said in his MO No. 30
dated June 4 but was made public on July 6.
“They
are reminded that low utilization of applied SPS-IC can affect their track
record and can be grounds for rejection of application or their suspension,”
Dar added.
Dar
issued the new order to address the “problem of low utilization” of SPS-IC for
milled rice and “ensure availability of food” during this Covid-19 pandemic.
The new
order required rice importers to submit additional requirements for the
application of SPS-IC which are 1) payment of certification of the consignment
and 2) list of distribution points/warehouse of the said consignment.
The
additional requirements shall be attached to the importers’ application
together with previous requirements of proforma/commercial invoice, GMO or
non-GMO certification and certificate of analysis for heavy metals, according
to the MO.
In his
order, Dar said failure to comply with the new requirements will result in
rejection of the traders and importers’ application for SPS-IC for milled rice.
BPI data
showed that the agency issued a monthly average of 654 SPS-IC while utilization
by importers was only at about 300 SPS-ICs per month.
In
January, BPI issued 801 SPS-ICs but only 307 SPS-ICs were used, while in
February, only 227 SPS-ICs were utilized by importers out of the 1,076 SPS-ICs
issued to them.
Under the
rice trade liberalization (RTL) law, interested rice importers shall secure a
SPS-IC—a document that certifies food and plant safety of the goods—from the
BPI to be able to bring in staple from abroad.
The
implementing rules and regulations (IRR) of the RTL law stipulated that
“imported rice should arrive before the expiration of the SPS-IC from BPI.”
Furthermore,
Dar issued MO No. 28, Series of 2019, that further specified the said provision
of the IRR of the law.
Based on
his MO last year, the actual rice consignment “must be shipped out from the
country of origin within the prescribed date in the approved SPS-IC and must
arrive not later than 60 days from the Must Ship Out Date.”
Earlier
this year, Dar ordered the voiding of all unused SPS-ICs for milled rice that
were issued last year as BPI data showed that some 1,752 SPS-ICs were unused at
the end of 2019.
Suvir’s Slice of Life: Birbal Kee Khitcheree will leave you craving for more
This dish is so lovely that I often just serve it with nothing else except for some raita, achaar (if craving spice), and crispy papadum on the side, shares chef Suvir Saran
Written by Suvir Saran | New Delhi | Published: July 19, 2020 1:00:24 pm
This dish is so lovely that I often just serve it with nothing else except for some raita, achaar if craving spice, and perhaps crispy papadum on the side. (Photo: Suvir Saran; designed by Shambhavi Dutta)
When craving comfort food, it is most often dreams of khitcheree that captivate my imagination. The vegetarian one-pot meal of lentils, rice, and vegetables is transported to another dimension via multiple layers of spices — every bite is a new discovery of tastes and textures.
The dish includes panch phoran a spice blend of whole cumin, fennel, and the wonderfully exotic nutty flavor of nigella seeds that are gently fried in ghee or clarified butter with coriander and tomatoes, and then a second boost of spice from a ghee-bloomed blend of more cumin, some cayenne, and oniony asafetida.
It is such an incredible dish that there is even a legend behind it: hundreds of years ago in the mid-14th century India, Birbal, a court official of Emperor Akbar, made a khitcheree that was so enchanting, the emperor decided to make Birbal a raja!
At our house, we like to say that if it’s good enough for Akbar and Birbal, it’s good enough for you. This dish is so lovely that I often just serve it with nothing else except for some raita, achaar if craving spice, and perhaps crispy papadum on the side. Make the recipe a few times and then begin to play with the flavors and simplify it as you like. I promise you won’t be disappointed.
For the topping
6 to 8 cups/1.4 to 1.9 l peanut oil 4 large red onions, halved and thinly sliced 1/4 cup/4 g finely chopped fresh coriander 2-inch/5 cm piece fresh ginger root, peeled and thinly sliced into very thin matchsticks 1 -2 green chilies, finely minced (remove the seeds for less heat) 1 tablespoon/15 ml lime juice 1/2 teaspoon garam masala powder
For the khitcheree
1 cup/190 g split and hulled (dhuli) mung dal 2 tablespoons/30 g ghee or clarified butter 10 green cardamon pods (sabut elaichi) 8 whole cloves (laung) 3 bay leaves (tej patta) 2-inch/5 cm cinnamon stick (dal chini) 1 teaspoon panch phoran 3/4 teaspoon turmeric (haldi) 1/8 teaspoon asafetida (heeng) 1 cup/185 g basmati rice 1/2 medium cauliflower, divided into very small florets 1 medium red potato, cut into 1/2-inch pieces 4 medium carrots, peeled and finely chopped 10-ounce/285 g bag frozen green peas
For the first tempering (tarka)
2 tablespoons/30 g ghee or clarified butter 1/2 teaspoon panch phoran 1 large red onion, halved and thinly sliced 1 tablespoons kosher salt or sea salt, or to taste 2 teaspoons ground coriander seeeds (dhaniye kee beej) 2 large tomatoes, finely diced 1/8 teaspoon cayenne pepper
* Heat the oil in a large Dutch oven (use enough oil to fill the saucepan to a 2-inch/5 cm depth) over medium-high heat until it reaches 350°F/177°C on an instant-read thermometer. Add the onions and fry until crisp and browned, about 2 minutes, turning the onions occasionally. Use a slotted spoon or frying spider to transfer the onions to a paper towel-lined plate and set aside.
* In a small bowl stir the cilantro, ginger, jalapeño, and lime juice together and set aside.
* Place the mung dal in a large skillet over medium heat and toast it until it is fragrant and lightly golden, 3 to 5 minutes. Transfer the dal to a large plate and set aside.
* Place the ghee, cardamom, coves, bay leaves, cinnamon, panch phoran, turmeric, and hing into the pan and roast it over medium heat until the spices are fragrant, about 2 minutes.
* Add the rice, toasted dal, the cauliflower, potatoes, and carrots and cook until the rice becomes translucent and the cauliflower sweats, 3 to 5 minutes, stirring often. Pour in 7 cups/1.65 l water, increase the heat to high and bring to a boil. Add the peas, bring back to a boil, reduce the heat to medium-low, cover, and simmer for 20 minutes.
* While the rice and dal mixture cooks, make the first tempering oil. Heat the ghee and panch phoran in a large skillet over medium heat until the cumin in the panch phoran begins to brown, 2 to 3 minutes. Stir in the onions and the salt and cook until the onions are browned around the edges and soft, about 10 minutes. If the onions begin to get too dark or stick to the pan bottom, splash the pan with a few tablespoons of water and scrape up the browned bits. Stir in the coriander and cook, stirring, for 2 minutes, and then stir in the tomatoes and the cayenne, cooking until the tomatoes are jammy, 6 to 8 minutes, stirring occasionally. Turn off the heat and set aside.
* Once the rice and dal are cooked, remove the lid and use a potato masher to smash the mixture until only a few carrots and peas remain whole (remove the whole or large spices while mashing if you like). Stir in the first tempering along with the remaining 3 cups/720 ml of water. Return to boil and cook for 2 minutes. Turn off the heat.
* Make the second tempering oil. Wipe out the pan from the first tempering oil and heat the ghee for the second tempering oil over medium heat along with the cumin, cayenne, and hing and cook, stirring often, until the cumin begins to brown, about 2 minutes. Immediately stir it into the rice and dal mixture.
Divide the khitcheree between 6 bowls and top with some of the ginger mixture, a pinch of garam masala, and the fried onions and serve.