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Environmental Engineering Research 2003;8(1): 8-14. DOI: https://doi.org/10.4491/eer.2003.8.1.008
IS INK HARMFUL TO WASTEWATER?
Jin-Hwa Park1, and Yong-Woo Yi2
1Department of Civil and Environmental Engineering, University of Wisconsin-Madison, 1415 Engineering Drive, Madison, WI 53706, U.S.A.
2Department of Electronic, Provincial College of Damyang, Chonnam 517-800, Korea
Corresponding Author: Jin-Hwa Park ,Tel: +82-62-530-3880, Fax: +82-62-530-3889, Email: einsteinpark@hanmatl.net
Received: December 10, 2001;  Accepted: October 10, 2002.
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ABSTRACT
In this study, we investigated what happens to wastewater after ink is discharged into the sewer. During oxygen uptake tests, the oxygen was depleted within 13 min for all the runs, indicating almost no inhibitory effect of the ink sample that was tested. It appears that it is not necessary to acclimate activated sludge for treatment of ink-containing wastewater, furthermore, according to the RET assay result, the initial samples (5 min after injecting ink solution) had almost the same % inhibition values as the samples after 10 hr of biological treatment. However, the samples after 20 hr of biological treatment showed lower % inhibitions. The ink sample tested may not be readily biodegradable but can be treated when the detention time of activated sludge processes is long (> 20 hr). The concentration of the sample that inhibits the SMP activity 50%. ECso, was 312 mg/L. This value is much lower than those determined for dyes used in textile industries.
Keywords: concentration | harmfulness | ink | toxicity | wastewater
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