Author(s): Yuli Pratiwi , Sri Sunarsih , Istiqomah S. Zamani
Published in: International Journal of Engineering Research & Technology
License: This work is licensed under a Creative Commons Attribution 4.0 International License.
Volume/Issue: Volume. 6 - Issue. 03 , March - 2017
The liquid waste from printing industries contains harmful chemicals, such as a remaining material for the screen afdruk, a residual of paint stencil, and a waste of textile washing process. This study aims to determine the quality and toxicity of waste silk screening against 50% Lethal Concentration (LC50) observations of 0-96 hours on common carp, before and after filtered by the zeolite. Results wastewater filtration stencil is then compared with the quality standards of Other Activities Standard. The standard is issued by Yogyakarta Governor on Regulation No.7 year of 2010, The comparison is based on the parameters of pH, COD, BOD, SS. The sample of liquid waste is taken from household printing industry which is located at Ponggok, Trimulyo, Jetis, Bantul, Yogyakarta. The research was conducted in three stages: (a) the stage of acclimatization of common carp; (b) toxicity test prior and after filtration using zeolite, namely a preliminary test and the actual test; (c) waste treatment process using zeolite filtration with 0-50 cm thick. The results show that the optimum thickness of zeolite used for filtration is 50 cm, with improvements pH of 33.4%; COD of 46.00%; BOD of 45.98%; and SS of 52.39%. According to the regilation, the value of pH and BOD are within the permissible value, but the COD and SS is still above the standard. LC50 96 hours prior to the filtration on common carp is at a concentration of 5.66%, whereas after filtration the concentration is at 13.17%. Efficiency of the improvements based on LC50 96 hours is 64.69%.
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