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Environmental Engineering Research 2012;17(1): 3-8. DOI: https://doi.org/10.4491/eer.2012.17.1.003
Feasibility Study on Production of Liquid Fertilizer in a 1 m3 Reactor Using Fishmeal Wastewater for Commercialization
Byeong Geun Gwon, and Joong Kyun Kim
Department of Biotechnology and Bioengineering, Pukyong NationalUniversity, Busan 608-737, Korea
Corresponding Author: Joong Kyun Kim ,Tel: +82-51-629-5866, Fax: +82-51-629-5863, Email: junekim@pknu.ac.kr
Received: August 19, 2011;  Accepted: February 15, 2012.
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ABSTRACT
A scaled-up bioconversion of fishmeal wastewater (FMW) into liquid fertilizer was performed five times in a 1 m3 reactor in order to examine the feasibility of commercialization. The importance of aeration was marked. Analyses indicated that dissolved oxygen (DO) level was closely related to the value of oxidation-reduction potential (ORP) and it was crucial to achieve high-quality liquid fertilizer. When pure oxygen was supplied through four diffusers into the reactor, DO levels and ORP values were maintained over 1.2 mg/L and 0.2 mV, respectively all the time during 52 hr of bioconversion. The pH changed from 6.8 to 5.9. The average removal percentages of chemical oxygen demand (CODCr) and total nitrogen (TN) were 75.0% and 71.6%, respectively. Compared to the result acquired in a 5-L reactor, bioconversion of FMW into liquid fertilizer was achieved in a shorter time under the same removal percentages of CODCr and TN. The 52-hr culture of inoculated FMW was phytotoxic-free and it possessed comparable fertilizing ability to a liquid fertilizer made from the fish waste in hydroponic culture with amino acid contents of 5.93 g/ 100 g sample. From all the above results, transferring labscale data to large-scale production appeared to be successful. As a result, the commercialization of a liquid fertilizer made from FMW was feasible.
Keywords: Aeration | Bioconversion | Fishmeal wastewater | Liquid fertilizer | Scale-up
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