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, also known as spiral coil or color coil, is a popular form of document binding that joins the pages and cover of a book using a plastic coiled spine. twisted coil is threaded through small holes punched along the spine edge of the book, then cut and crimped at the ends to secure it in place and prevent the coil from unwinding. Coil binding is extremely durable and provides a professional-looking finish for books. Sp

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BTFs have successfully removed formaldehyde at typical ethanol plants emissions ~21 ppmv. The BTF technology have the potential in replacing the conventional air treatment methods used at ethanol plants.Implications Currently, ethanol plants remove and treat hazardous air pollutants (HAPs) using wet scrubbers from the fermenter off-gasses and using thermal oxidizers to combust off-gasses. The utilization of biotrickling filters (BTFs) for HAP removal generally and formaldehyde particularly has wide implication in the fi