Posts Tagged ‘sewage’
“Most things are never meant”*…
Protein-packed diets add excess nitrogen to the environment through urine, rivaling pollution from agricultural fertilizers…
In the U.S., people eat more protein than they need to. And though it might not be bad for human health, this excess does pose a problem for the country’s waterways. The nation’s wastewater is laden with the leftovers from protein digestion: nitrogen compounds that can feed toxic algal blooms and pollute the air and drinking water. This source of nitrogen pollution even rivals that from fertilizers washed off of fields growing food crops, new research suggests.
When we overconsume protein—whether it comes from lentils, supplements or steak—our body breaks the excess down into urea, a nitrogen-containing compound that exits the body via urine and ultimately ends up in sewage… the majority of nitrogen pollution present in wastewater—some 67 to 100 percent—is a by-product of what people consume…
Once it enters the environment, the nitrogen in urea can trigger a spectrum of ecological impacts known as the “nitrogen cascade.” Under certain chemical conditions, and in the presence of particular microbes, urea can break down to form gases of oxidized nitrogen. These gases reach the atmosphere, where nitrous oxide (N2O) can contribute to warming via the greenhouse effect and nitrogen oxides (NOx) can cause acid rain. Other times, algae and cyanobacteria, photosynthetic bacteria also called blue-green algae, feed on urea directly. The nitrogen helps them grow much faster than they would normally, clogging vital water supplies with blooms that can produce toxins that are harmful to humans, other animals and plants. And when the algae eventually die, the problem is not over. Microorganisms that feast on dead algae use up oxygen in the water, leading to “dead zones,” where many aquatic species simply cannot survive, in rivers, lakes and oceans. Blooms from Puget Sound to Tampa, Fla., have caused large fish die-offs…
If it’s not one thing, it’s another: “Eating Too Much Protein Makes Pee a Problem Pollutant in the U.S.,” from Sasha Warren (@space_for_sasha) in @sciam.
* Philip Larkin, “Going, Going” (in High Windows)
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As we deliberate on our diets, we might recall that it was on this date in 1888 that Theophilus Van Kannel received a patent for the revolving door, a design that came to characterize the entrances of (then-proliferating) skyscrapers and that earned him induction into the National Inventors Hall of Fame. But lest we think him “all work,” his other notable invention was the popular (at least in the early 20th century) amusement park ride “Witching Waves.”
“The longer I live the greater is my respect for manure in all its forms”*…
Two crucial and interconnected resources—human feces and arable soil—face crises of mismanagement…
… the problem of how to deal with our “dark matter” has plagued humanity for millennia. As soon as people stopped moving around in pursuit of prey, the stuff began to pile up. Neolithic farmers may have had no idea of germ theory, but they were smart enough to know they didn’t want to live next to—or on top of—their own shit. They dug pits or ditches out in their fields to serve as open-air toilets. As the number of people living in close quarters grew, pits no longer sufficed. People turned to more sophisticated waste-disposal methods, usually involving water.
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Sewage treatment plants… manage, by and large, to keep raw sewage out of waterways, and this has mostly eliminated outbreaks of cholera as well as typhoid. But the practice of washing nutrients down the drain remains as big an issue as ever.
Of all the nutrients we’re redistributing, probably the most significant is nitrogen. It’s difficult for plants—and, by extension, plant eaters—to obtain nitrogen. In the air, it exists in a form—N2—that most living things can’t utilize. For hundreds of millions of years, plants have relied on specialized bacteria that “fix” nitrogen into a compound they can make use of. When people started farming, they figured out that legume crops, which harbor nitrogen-fixing bacteria in nodules on their roots, replenish soil. Manure and human waste, or “night soil,” also provide nitrogen for plants.
When synthetic fertilizer was invented, in the early twentieth century, the world was suddenly awash in nitrogen. This enabled people to grow a lot more food, which, in turn, enabled them to produce a lot more people, who produced a lot more shit. Via our wastewater treatment plants, we now introduce vast quantities of nitrogen into coastal environments, where it’s wreaking havoc. (Fertilizer runoff also contributes to the problem.)
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Jo Handelsman, a plant pathologist who runs an interdisciplinary research center at the University of Wisconsin at Madison, is also interested in “dark matter.” Handelsman, however, uses the term to refer to soil. And the problem she’s concerned with is not that we have too much of the stuff, but too little. “The plight of the world’s soils is a silent crisis”… Agriculture requires rich soil, but most modern practices are, unfortunately, terrible for it…
From the estimable Elizabeth Kolbert (@ElizKolbert) and @nybooks: “The Waste Land.”
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As we go back to basics, we might recall that it was on this date in in 1874 that Lewis H. Latimer received his first patent (U.S. Patent 147,363), for an improved water-closet for railway cars.
Latimer went on to develop an improved process for manufacturing carbon filaments for light bulbs, to write the first book on electric lighting, and to invent an evaporative air conditioner, a forerunner of today’s systems.
“Tragedy is when I cut my finger. Comedy is when you fall into an open sewer and die”*…
Further to Wednesday’s almanac entry on America’s first independent municipal sewer system…
Sometime in mid to late January, researchers from MIT plan to gather around a manhole on Portland Street in East Cambridge, dressed in plastic disposable biohazard coats and gloves. Each hour over the next 24, working in teams of two over four-hour shifts, they’ll sink a tube into the muck and pump one to two liters of sewage water into a plastic container. The container will be put into a cooler and taken to the nearby lab at MIT run by Eric Alm, a computational microbiologist. Alm’s lab will analyze all 24 of these sludgy samples to see what viruses and bacteria they hold; meanwhile, a vial of each sample will be sent to another lab to be analyzed for biomarkers (molecular or cellular flags for things like diseases and drugs, legal and illegal ).
These researchers—who include architects, computational biologists, designers, electrical and mechanical engineers, geneticists, and microbiologists—will be testing an idea that’s attracting interest around the world: namely, that sewage can tell us important things about the people who excrete it. Already, research has shown that sewage can reveal illicit drug usage, the presence of influenza, the poliovirus and other pathogens, and the state of community health. So far, however, none of this has been tested in our local waste systems, other than some proof-of-concept sampling done in Boston. That has led to this first formal effort by scientists and public health officials to get a sewage snapshot of the people of Cambridge…
Get to the bottom at “What does Cambridge sewage say about residents? MIT plans to find out.”
* Mel Brooks
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As we hold our noses, we might recall that it was on this date in 1594 that Shakespeare’s Titus Andronicus was first performed (by Sussex’s Men at The Rose). Titus‘s premiere is the first performance of a Shakespeare play of which there is precise record (though confident deduction dates other plays’ performances earlier); it was recorded in Philip Henslowe‘s diary. It is also the only Shakespeare play for which a contemporary illustration survives, the work of a drawing master named Henry Peacham.
The Peacham drawing (c.1595)
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