Journal of the Korea Organic Resources Recycling Association (유기물자원화)

Korea Organic Resources Recycling Association (유기성자원학회)
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Influence of Effluent from a Sludge Carbonization Facility on Wastewater Treatability

슬러지탄화공정수 연계처리가 하수처리효율에 미치는 영향

  • Han, Joo Eun (Department of Environmental Engineering, Kumoh National Institute of Technology) ;
  • Park, Soo-Hyung (Department of Environmental Engineering, Kumoh National Institute of Technology) ;
  • Lee, Wontae (Department of Environmental Engineering, Kumoh National Institute of Technology)
  • 한주은 (금오공과대학교 환경공학과) ;
  • 박수형 (금오공과대학교 환경공학과) ;
  • 이원태 (금오공과대학교 환경공학과)
  • Received : 2019.02.28
  • Accepted : 2019.03.23
  • Published : 2019.03.30
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Abstract

We investigated influence of connected influent on the treatability of a wastewater treatment plant (WWTP), recently accepting effluent from a sludge carbonization facility. Based upon the pollutant loading rates (kg/d) of each connected influent, food waste leachate and livestock wastewater contributed to high BOD and COD loadings, while sludge carbonization facility effluent certainly contributed to T-N and $NH_3-N$ loadings. The nitrification rate in aerobic tank decreased to 55% with the carbonization facility effluent entering to the WWTP, while it was 89% with no carbonization facility effluent entering. The sludge carbonization facility effluent may need to be pretreated to reduce T-N and $NH_3-N$ loadings before entering to the WWTP for further treatment.

유입하수와 기존 연계처리수(축산폐수, 분뇨, 음폐수 등)에 더하여 슬러지탄화시설에서 발생되는 유출수가 추가로 유입되며 질소성분의 처리에 어려움을 겪고 있는 하수처리시설을 대상으로 연계처리가 처리효율에 미치는 영향을 조사하였다. 하수처리시설에 유입되는 연계처리수의 부하량(kg/d)을 산출한 결과, BOD 및 COD의 경우 음폐수와 축산폐수가 차지하는 비중이 상대적으로 크게 나타났고, T-N과 $NH_3-N$은 탄화공정수가 차지하는 비중이 가장 큰 것을 확인할 수 있었다. 탄화공정수가 방류수질에 미치는 영향을 분석하기 위하여 탄화공정수 유입 유무에 따른 공정별 처리효율을 분석결과, 호기조에서 $NH_3-N$의 질산화율이 탄화공정수가 유입되지 않는 경우 89%이었으나 탄화공정수가 유입되는 경우 55%로 낮아져 탄화공정수 유입시 질산화효율이 현저히 떨어지는 것을 확인하였다. 탄화공정수 유입으로 인한 질소 및 암모니아 부하량 증가 및 이로 인한 제거율 악화를 해결하기 위해서는 탄하공정수의 전처리를 통해 질소성분의 부하를 낮추어야 할 것으로 판단된다.

Keywords

DOGSBE_2019_v27n1_57_f0001.png 이미지

Fig. 1. Annual variations in water qualities of effluents from WWTP A: (A) BOD, (B) SS, and (C) TN (Box plot from bottom to top, 25th percentile, median (solid), average (dash) and 75th percentile, respectively; ⌶: 10th and 90th percentiles; low point, minimum, high point, maximum).

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Fig. 2. Daily loadings of BOD, COD, SS, T-N, NH3-N, and T-P by each influent to the WWTP.

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Fig. 3. Removal efficiency of organics and nutrients at the WWTP with and without carbonization-unit-effluent entering.

Table 1. Flowrates and Water Quality Parameters of Each Influent to the Wastewater Treatment Plant (WWTP)

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Table 2. Mass Flow of Water Quality Parameters by Each Process Without the Inflow of the Carbonization Facility Effluent

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Table 3. Mass Flow of Water Quality Parameters by Each Process with the Inflow of the Carbonization Facility Effluent

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