Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Performance Evaluation of Biofilter Treating Autothermal Thermophilic Aerobic Digestion Offgas

고온호기성 소화공정 배가스 처리를 위한 바이오필터 성능평가

  • Bae, Byung-Uk (Department of Environmental Engineering, Daejeon University) ;
  • Choi, Ki-Seung (Department of Environmental Engineering, Daejeon University)
  • 배병욱 (대전대학교 환경공학과) ;
  • 최기승 (대전대학교 환경공학과)
  • Received : 2010.01.14
  • Accepted : 2010.05.25
  • Published : 2010.09.30
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Abstract

Two combined autothermal thermophilic aerobic digestion (ATAD) and biofilter (BF) systems were operated to treat the piggery wastewater and the ammonia offgas. Experimental results indicated that the organic removal efficiency of ATAD-2, operated with oxygen, was higher than that of ATAD-1, operated with air. The concentration of ammonia in ATAD-2 offgas was higher compared to ATAD-1 offgas, but the total amount of ammonia produced from ATAD-2 was less than that from ATAD-1 due to the lower oxygen flowrate. The ammonia gas produced from both ATAD reactors was successfully removed by the BF. The BF-1, connected with ATAD-1, removed 93% of ammonia at the loading rate of $9.4g\;NH_3-N/m^3/hr$. The BF-2, connected with ATAD-2, removed 95% of ammonia gas at the loading rate of $8.1g\;NH_3-N/m^3/hr$. As the nitrification process continued, pH value of recirculating solution continuously decreased due to the accumulation of nitrate. When the ammonia loading rate was less than $22.7g\;NH_3-N/m^3/h$, the proper replacing cycle of recirculating solution was in the range of 10 to 11 days. Almost 90% of total mass of nitrogen fed into the each BF was confirmed from the mass balance on nitrogen.

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References

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