การบำบัดและการรีไซเคิลคอนเดนเสทจากกระบวนการผลิตผลพลอยได้ของ โรงงานทูน่ากระป๋อง

Abstract

This research aimed to treat the condensate from by-product production processes of canned tuna factories and recycle to the fish oil production process by reducing pH and remove the odors by using commercial activated carbon, Eunicarb ID900. The research began with a study of the effect of pH (7-9) on the elimination of COD (parameters representing odors) and followed by a semi-industrial continuous adsorption study to treat condensate water in the actual process. The result showed that a faster absorption rate was achieved at lower pH while higher COD removal obtained at higher pH with the highest COD removal efficiency of 90%. The adsorption was fitted well with Pseudo-second order kinetic absorption and Freundlich's adsorption isotherm. The study of semi-industrial condensate water treatment using 15 cm diameter and 150 cm in height adsorbent columns revealed that at all the study range flow rate of condensate water (pH adjustment to 7.3 ± 0.1) of 0.5 - 2.5 m3/h, can effectively remove the pungent odor and produce the higher condensate water which meet the limitation of water for fish oil extraction manufacturing. Furthermore, the treatment system was continuously run at an actual condensate production rate at flow rate of 2.5 m3/h, and 6 months operation cycle was suggested. No effect in both quantitative and qualitative quality of fish oil was observed after processing with the treated condensate. The economic assessment for the actual plant evaluates the cost for condensate treatment of 8.14 Baht/m3, saving for the feed water and condensate treatment of 202,500 Baht/year, and a payback period of 2.86 years.