Sewage Sludge You Don’t Want on Your Veggies
Nothing to do with topic, I just like the picture.
You may have heard something along the lines of pharmaceuticals showing up in our water supply, as so many of us are taking more than an aspirin and still calling our doctors for more. Well, the good news is that yes, pharmaceuticals are showing up in water and in great concentrations in what is removed from our water — sewage sludge. The bad news is that there is a lot more stuff in that sewage sludge than just antidepressants.
Biosolids and You
As the EPA says, “The terms sewage sludge and biosolids are used by EPA interchangeably, but others often use the term biosolids to describe sewage sludge that has had additional processing for land application.” So in this case, biosolids are solid and biological in origin, that is it comes from humans and animals. These biosolids are often converted to fertilizers as our poo and pee have lots of nitrogen and other beneficial nutrients. That’s why manure is used in organic farming, after all. Well, sometimes that manure is yours.
Or was yours, rather.
What the report says is that there is a whole lotta sh*t in our sewage sludge, and I’m not talking feces here. The EPA looked at samples from 74 water treatment plants in 35 states, and here’s what they were looking for in all that sludge.
Many of the 145 chemicals tested for were present nationwide. Biosolids from all of the 74 large treatment plants surveyed contained the same 27 metals, but only zinc, molybdenum, and nickel exceeded standards for application to fields. Almost all of the 11 flame retardants on the list were present in every sample. Twelve of the 72 pharmaceuticals were similarly ubiquitous.
Two of the most common drugs were the antibiotics triclocarban and ciprofloxacin. Although the average concentrations were similar to those in previous small-scale studies, several samples harbored up to 440 parts per million of triclocarban, which is added to antimicrobial soap and other personal care products. That’s almost 10 times higher than ever reported in biosolids and “astonishingly high,” Halden says. One question is whether the antibiotics harm soil microbes, or aquatic life if enough leaches into streams, Halden says. “We really don’t have the answer.” –Science
Remember how some people warned everybody about using antibacterial soaps because they would breed super germs? Seems like that was the least of our worries. If sewage sludge continues to accumulate antibiotics, and if that sewage were processed through into fertilizer, the antibiotics could end up creating major issues in agricultural soils which depend on beneficial microbes and bacteria to break down nutrients for crops.
And that’s just the downside to antibiotics…we haven’t even gotten into the other stuff yet.
EPA, sewage sludge, sewage, fertilizer, crops, soil, water, water treatment, antibiotics, antidepressants, water supply, waste, human, agriculture, chemicals, organic farming
January 27th, 2009 at 4:51 pm
[...] things that make life worth living, am I right? — are showing up in our water supplies. These chemicals may have a rather harmful and decidedly less fruitful side effect on a man’s reproductive [...]