본 연구에서는 2008년부터 특정유해물질로 정해진 아크릴로니트릴의 함유 폐수를 이용하여 질소·인 동시 제거공정인 A2/O 공정으로 유기물 제거 특성과 질소 및 인 제거 특성을 조사해 보았다. 아크릴로니트릴을 탄소원과 질소원으로 사용하였고 인은 KH2PO4를 이용하여 주입하였다. 반응기는 두 반응기를 이용하였는데, 각각 MLSS 1,000mg/L와 2,000mg/L로 유지시켰고, 수리학적체류시간(HRT)을 변화하며 실험을 실시하였다. 내부반송은 2Q, ...
본 연구에서는 2008년부터 특정유해물질로 정해진 아크릴로니트릴의 함유 폐수를 이용하여 질소·인 동시 제거공정인 A2/O 공정으로 유기물 제거 특성과 질소 및 인 제거 특성을 조사해 보았다. 아크릴로니트릴을 탄소원과 질소원으로 사용하였고 인은 KH2PO4를 이용하여 주입하였다. 반응기는 두 반응기를 이용하였는데, 각각 MLSS 1,000mg/L와 2,000mg/L로 유지시켰고, 수리학적체류시간(HRT)을 변화하며 실험을 실시하였다. 내부반송은 2Q, 슬러지 반송은 Q로 실험을 하였다. 아크릴로니트릴의 유기물 제거 특성은 BOD와 COD 모두 96∼98% 정도로 매우 높은 제거효율을 나타내었으며, HRT가 줄어들면서 제거 효율이 점차 감소하는 것으로 조사되었다. 또한 아크릴로니트릴 함유 폐수는 생분해 불가능한 물질이 처리수에 다량 함유되어 있는 것으로 조사되었다. 아크릴로니트릴 함유 폐수의 반응속도상수는 F/M비가 낮은 반응조에서 F/M비가 높은 반응조 보다 낮게 산정 되었으며, 미생물 합성 계수 값은 F/M비가 높은 반응조보다 F/M비가 낮은 반응조에서 보다 다소 높았고, 내생호흡계수 값은 F/M비가 높은 반응조에서 보다 높게 나타났다. 아크릴로니트릴의 질소 제거는 A2/O 공정에서 HRT가 감소하면서 제거효율도 감소하는 것으로 조사되었다. 질산화는 충분히 이루어지지만 탈질은 이루어지지 않았다. 아크릴로니트릴 폐수의 인 제거는 원활하게 이루어지지 않았지만 HRT 값의 감소에 따라 인 제거 능력도 감소하는 경향을 나타내었다.
본 연구에서는 2008년부터 특정유해물질로 정해진 아크릴로니트릴의 함유 폐수를 이용하여 질소·인 동시 제거공정인 A2/O 공정으로 유기물 제거 특성과 질소 및 인 제거 특성을 조사해 보았다. 아크릴로니트릴을 탄소원과 질소원으로 사용하였고 인은 KH2PO4를 이용하여 주입하였다. 반응기는 두 반응기를 이용하였는데, 각각 MLSS 1,000mg/L와 2,000mg/L로 유지시켰고, 수리학적체류시간(HRT)을 변화하며 실험을 실시하였다. 내부반송은 2Q, 슬러지 반송은 Q로 실험을 하였다. 아크릴로니트릴의 유기물 제거 특성은 BOD와 COD 모두 96∼98% 정도로 매우 높은 제거효율을 나타내었으며, HRT가 줄어들면서 제거 효율이 점차 감소하는 것으로 조사되었다. 또한 아크릴로니트릴 함유 폐수는 생분해 불가능한 물질이 처리수에 다량 함유되어 있는 것으로 조사되었다. 아크릴로니트릴 함유 폐수의 반응속도상수는 F/M비가 낮은 반응조에서 F/M비가 높은 반응조 보다 낮게 산정 되었으며, 미생물 합성 계수 값은 F/M비가 높은 반응조보다 F/M비가 낮은 반응조에서 보다 다소 높았고, 내생호흡계수 값은 F/M비가 높은 반응조에서 보다 높게 나타났다. 아크릴로니트릴의 질소 제거는 A2/O 공정에서 HRT가 감소하면서 제거효율도 감소하는 것으로 조사되었다. 질산화는 충분히 이루어지지만 탈질은 이루어지지 않았다. 아크릴로니트릴 폐수의 인 제거는 원활하게 이루어지지 않았지만 HRT 값의 감소에 따라 인 제거 능력도 감소하는 경향을 나타내었다.
This study conducted into the removal characteristics of organics as well as of nitrogen and phosphorus by using the A2/O process that is a simultaneous removal process of nitrogen and phosphorus, for treating wastewater containing acrylonitrile which was specified as a specific harmful material sin...
This study conducted into the removal characteristics of organics as well as of nitrogen and phosphorus by using the A2/O process that is a simultaneous removal process of nitrogen and phosphorus, for treating wastewater containing acrylonitrile which was specified as a specific harmful material since 2008. The concentration of influent was used as a carbon source and a nitrogen source by using acrylonitrile, and phosphorus was injected by using KH2PO4. Two reactors were used, and they were maintained to hold MLSS 1,000mg/L and 2,000mg/L, respectively. They were subjected to an experiment by changing hydraulic retention time (HRT). The internal return was tested with 2Q while sludge return was tested with Q. The removal characteristics of organics demonstrated a very high, while posting 96∼98% concerning both BOD and COD, and it was found that the smaller the HRT, the more reduced the removal efficiency. Also, regarding wastewater containing acrylonitrile, substances which are not biodegradable were highly contained in treated wastewater. The reaction rate constant (K) of wastewater containing acrylonitrile was calculated to be lower in a reactor of which the F/M ratio is low than in a reactor of which the F/M ratio is high. Microbial yield coefficient (Y) value was slightly higher in a reactor of which the F/M ratio is low than in a reactor of which the F/M ratio is high. Endogenous respiration rate (Ke) value was discovered as being higher in a reactor of which the F/M ratio is high. In the nitrogen removal by acrylonitrile wastewater, the removal efficiency was proven to decrease as HRT was reduced during the A2/O process. Nitrification was sufficiently performed, and, yet, denitrification did not occur. Although the phosphorus removal by acrylonitrile was not very successful, the phosphorus removal ability was likely to decline along with the decrease of HRT.
This study conducted into the removal characteristics of organics as well as of nitrogen and phosphorus by using the A2/O process that is a simultaneous removal process of nitrogen and phosphorus, for treating wastewater containing acrylonitrile which was specified as a specific harmful material since 2008. The concentration of influent was used as a carbon source and a nitrogen source by using acrylonitrile, and phosphorus was injected by using KH2PO4. Two reactors were used, and they were maintained to hold MLSS 1,000mg/L and 2,000mg/L, respectively. They were subjected to an experiment by changing hydraulic retention time (HRT). The internal return was tested with 2Q while sludge return was tested with Q. The removal characteristics of organics demonstrated a very high, while posting 96∼98% concerning both BOD and COD, and it was found that the smaller the HRT, the more reduced the removal efficiency. Also, regarding wastewater containing acrylonitrile, substances which are not biodegradable were highly contained in treated wastewater. The reaction rate constant (K) of wastewater containing acrylonitrile was calculated to be lower in a reactor of which the F/M ratio is low than in a reactor of which the F/M ratio is high. Microbial yield coefficient (Y) value was slightly higher in a reactor of which the F/M ratio is low than in a reactor of which the F/M ratio is high. Endogenous respiration rate (Ke) value was discovered as being higher in a reactor of which the F/M ratio is high. In the nitrogen removal by acrylonitrile wastewater, the removal efficiency was proven to decrease as HRT was reduced during the A2/O process. Nitrification was sufficiently performed, and, yet, denitrification did not occur. Although the phosphorus removal by acrylonitrile was not very successful, the phosphorus removal ability was likely to decline along with the decrease of HRT.
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