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Influence of Food Wastewater Loading Rate on the Reactor Performance and Stability in the Thermophilic Aerobic Process  

Jang, Hyun Min (School of Environmental Science and Engineering, Pohang University of Science and Technology)
Choi, Suk Soon (Department of Biological and Environmental Engineering, Semyung University)
Ha, Jeong Hyub (Department of Chemical Engineering, Pohang University of Science and Technology)
Park, Jong Moon (Department of Chemical Engineering, Pohang University of Science and Technology)
Publication Information
Applied Chemistry for Engineering / v.24, no.3, 2013 , pp. 279-284 More about this Journal
Abstract
In this study, the feasibility of a single-stage thermophilic aerobic process for the treatment of high-strength food wastewater produced from the recycling process of food wastes was examined to substitute anaerobic digestion process. Also, the removal and stability of thermophilic aerobic process were assessed according to the changes of hydraulic retention times (HRTs) and organic loading rates (OLRs). When the OLR increased from 9.2 to $37.2kgCOD/m^3d$, a pH value in R1 (HRT : 5 d) significantly decreased to 5.0, due to the organic acid accumulation. On the other hand, the pH value in R2 (HRT : 10 d) was stable and R2 showed the high removal of COD, organic acid and lipid, even though the OLR increased from 4.6 to $18.6kgCOD/m^3d$. In R1, the COD loading rates for COD removal was suddenly dropped, as the COD loading rate increased from 18.6 to $28.4kgCOD/m^3d$. In contrast, R2 showed that the COD loading rates for COD removal increased with regard to increment in the loading rates of 3.61, 7.05, 9.43 and $12.2kgCOD/m^3d$, indicative of the high COD removal efficiency. Therefore, the results demonstrated that over 10-d HRT, the high concentration of raw food wastewater was efficiently treated in the single-stage thermophilic aerobic process.
Keywords
thermophilic aerobic digestion; food wastewater; organic loading rate (OLR); organic acid; lipid;
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