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PCB warning label on a power transformer known to contain PCBs. Polychlorinated biphenyls (PCBs) are organochlorine compounds with the formula C 12 H 10−x Cl x; they were once widely used in the manufacture of carbonless copy paper, as heat transfer fluids, and as dielectric and coolant fluids for electrical equipment. [2]
ASR is sometimes differentiated into shredder light fraction and dust. Sometimes these residual materials are called "car-fluff". ASR often contains hazardous substances such as lead, cadmium, and PCB. Therefore, some countries have classified ASR as hazardous waste and have established legislative controls. [1]
Bioremediation of PCBs is the use of microorganisms to degrade PCBs from contaminated sites, relying on multiple microorganisms' co-metabolism. Anaerobic microorganisms dechlorinate PCBs first, and other microorganisms that are capable of doing BH pathway can break down the dechlorinated PCBs to usable intermediates like acyl-CoA or carbon ...
PCB-compounds, always containing low concentrations of dioxin-like PCBs and PCDFs, were synthesized for various technical purposes (see Polychlorinated biphenyls). They have entered the environment through accidents such as fires or leaks from transformers or heat exchangers, or from PCB-containing products in landfills or during incineration.
Most countries are not on track to eliminate their supplies of highly hazardous compounds called polychlorinated biphenyls (PCBs), contrary to a 2028 deadline established by the Stockholm ...
It was found to be an unwanted by-product in the manufacturing of chlorinated compounds; it is not commercially used or produced itself. TCDF is directly released into the environment via emissions of waste incineration, fires with PCB transformers, vehicle exhausts using leaded fuel, and bleaching of industrial products.
Polychlorinated biphenyls (PCB) constitute a wide array of now-banned organic chemicals with a variety of industrial applications. At the Kalamazoo River site, most PCBs are a result of the recycling of carbonless copy paper during the 1970s, the waste products from which were dumped into the river.
(See here for a full list of the recalled products, along with their UPC codes and best-by dates.) Image of recalled MadeGood granola bars. / Credit: Food and Drug Administration.