A new study eases concerns that irrigating crops with water released
from sewage treatment plants -- an increasingly common practice in arid
areas of the world -- fosters emergence of the antibiotic-resistant
bacteria that cause thousands of serious infections each year. The
research appears in ACS' journal Environmental Science & Technology.
Eddie Cytryn and colleagues explain that a large fraction of
antibiotics given to people or animals pass out of the body unchanged in
the urine and are transferred via sewage systems to wastewater
treatment facilities. These facilities do not completely remove common
antibiotics like tetracycline, erythromycin, sulfonamide and
ciprofloxacin and may actually enhance the abundance of
antibiotic-resistant bacteria and antibiotic-resistance genes.
Previous studies have suggested that wastewater effluents can expand
natural reservoirs of antibiotic resistance, which may contribute to
clinically associated antibiotic resistance. Arid and semi-arid areas of
the world are plagued by severe water shortages, which are expected to
increase as a result of growing population and global climate change. As
a result, more areas are turning to treated wastewater (TWW) to
irrigate croplands. In Israel, for instance, TWW provides more than half
of the water used for irrigation. The researchers wanted to find out if
long-term irrigation with treated wastewater enhances antibiotic
resistance in soil microbial communities, which could potentially be
transferred through agricultural produce to clinically relevant
bacteria.
The authors found that levels of antibiotic-resistant bacteria and
genes for antibiotic resistance in fields and orchards irrigated with
freshwater and TWW were essentially identical, suggesting that
antibiotic-resistant bacteria that enter soil by irrigation are not able
to survive or compete in that environment. The authors say there is
"cause for cautious optimism" that irrigating with TWW is not increasing
the prevalence of bacteria resistant to the antibiotics they studied.
The authors acknowledge funding from the Israeli Ministry of
Agriculture and Rural Development and the Environmental Health Fund.
Hello Friends,
ReplyDeleteVery informative video. The sewage treatment plant is to stabilize decomposable organic matter present in the sewage so as to produce an effluent and sludge, which can be disposed of in the environment without causing health hazards or any such nuisance. Before proceeding with the design of the treatment plant it is essential to know the variations in quantity and characteristics. Thanks...
Sustainable Water Treatment