For the effective treatment of complex dyeing process wastewater, a stirred loop bioreactor was designed. The removal of BOD, COD and DOC included in dyeing process wastewater was investigated using this bioreactor. During an operation period of the bioreactor, the changes of MLSS and MLVSS concentrations inside the reactor were investigated. From the experimental results, the COD(Cr) removal efficiencies were 98% at the HRT of 26 hrs, 92.4% at the HRT of 16 hrs, and 71.6∼81.4% at the HRT of 6 hrs. The BOD5 removal efficiencies at the HRT of 26 hrs, 16 hrs, and 6 hrs were 99%, 96.7% and 82.0∼91.9%, respectively. The BOD5 removal efficiencies were 98.0% at the loading rate of 0.4 kg BOD5/day, 94.7% at the loading rate of 0.70∼0.80 kg BOD5/day, 91.0% at the loading rate of 1.5 kg BOD5/day. The MLSS and MLVSS concentrations increased as the BOD5 loading rates increased within the limit of 1.5 kg BOD5/day. Stable operation of the bioreactor was possible as long as MLVSS/MLSS ratio was kept above 0.7 for a wide range of BOD5 loading rates.

종합염색가공폐수를 효과적으로 처리하기 위해 교반형 루프생물반응기를 고안하였다. 이 생물반응기를 사용하여 염색가공폐수를 처리하여 BOD, COD, DOC 제거를 조사하였고, 또 생물반응기 운전기간동안 반응기내의 MLSS와 MLVSS 농도를 조사하였다. 연속식 염색가공폐수 처리실험결과 COD(Cr) 제거효율은 수리학적체류시간을 26 h으로 하였을 때 98%, 16 h으로 하였을 때 92.4%, 6 h으로 하였을 때 71.6∼81.4% 범위였다. 또 수리학적체류시간을 26 h, 26 h, 6 h으로 하였을 때 BOD(5) 제거효율은 각각 99%, 96.7%, 82.0∼91.9%로 나타났다. BOD(5) 부하율에 따른 BOD(5) 제거효율은 BOD(5) 부하율이 0.4 kg BOD(5)/day일 때 98.0%, 0.70∼0.80 kg BOD(5)/day 일 때 94.7%, 1.5 kg BOD(5)/day일 때 91.0%였다. BOD(5) 부하율이 1.5 kg BOD(5)/day 이내의 범위에서 BOD(5) 부하율이 증가함에 따라 MLSS와 MLVSS 농도도 증가하였다. 넓은 BOD(5) 부하율에서 MLVSS/MLSS 비는 0.7 이상을 유지하였고 이에 따라 생물반응기의 안정적인 운전이 가능하였다.