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

음폐수 부하량에 따른 고온호기성 공정의 처리 양상

  • 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)
  • 장현민 (포항공과대학교 환경공학부) ;
  • 최석순 (세명대학교 바이오환경공학과) ;
  • 하정협 (포항공과대학교 화학공학부) ;
  • 박종문 (포항공과대학교 화학공학부)
  • Published : 2013.06.10

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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