nts/100ml 및 일반세균수는 1,369×10**2 counts/ml로 측정되었다. 또한 병상수(beds)당 폐수배출량은 70ℓ/d/bed이었다.
2. 실험실적인 비연속배양(batch culture)에서 소독제가 활성오니 증식에 미치는 영향을 조사하여 본 결과 소독제가 포함되지 않은 인공하수에 비해서 12시간동안에 cresol의 경우 0.1ppm에서 95.3%, 0.5ppm에서 73.5%, 1ppm에서 30.9%가 증식되었고, potadine의 경
우 0.1ppm에서 96.3%, 0.5ppm에서 83.8%, 1ppm에서 44.1%가 증식하였다. Cresol과 Potadine의 혼합농도의 경우 0.1ppm에서 73.5%, 0.5ppm에서 41.2%, 1ppm에서는 16.2%가 증식되었다. 또한 cresol과 potadine은 다같이 0.1ppm이하의 경우에는 활성오니 증식에 큰 영향
을 미치지 않았으나 0.1ppm이상의 경우에는 활성오니 증식은 소독제의 농도가 높을수록 대수성장기의 출현시간이 지연되었다. 두 소독제의 혼합농도가 각기 0.1ppm의 경우에는 활성오니증식억제 작용이 각기 따로 처리하는 경우보다 컷다.
3. 소독제에 적응된 활성오니에 의한 활성오니처리법에서 Potadine 이 0.4ppm함유된 병원폐수의 경우 77.6%가 제거되었다. 이때 BOD는 원폐수에 대하여 85.6%가 제거되었다.
4. 병원의 폐수배출은 성분이 다른 생활하수와 의료폐수를 분리하여 처리하도록 계획하는 것이 바람직하다.
이상의 실험결과로부터 병원폐수의 특성에 따른 소독제가 다량 함유된 평원폐수를 활성오니처리방법으로 처리할 수 있는 가능성을 얻었다.
[영문]
The hospital wastewaters have to be so disposed as to prevent disease and to protect water resources from hazardous substances; disinfectants, medicines, and chemicals.
Polyvinyl-pyrrolidone-iodine (Potadine) is widely used in the hospital as one of disinfectants.
The problems on the activated sludge process of the treatment of the hospital watewater containing potadine and cresol are studied about amounts dischanged, toxicity and elimination of such disinfectant in the wastewater.
This study was carried out to manifest wastewater quality and quantity, the effect of disinfectants on growth of activated sludge as well as the removal rate(%) of disinfectants and BOD and COD in treatment of the hospital wastewater in the activated sludge process.
The results of laboratory study were as follow.
1. An average water quality of the hospital wastewater showed 7.2 in pH, 3.2 ppm in DO, 293.3 ppm in SS, 96.0 ppm in BOD, 151.1 ppm in COD, 0.4 ppm in Potadine, 0.5 ppm in phenols, 5.4 ppm in surfactants, 1.6 ppm in total-p, 4.6 ppm in NH^^3-N,
249×10**4 counts/100ml in coliform group organisms and 1,369x10**2 counts/ml in general count of bacteria.
2. The results of growth study for the activated sludge by experimental batch system were multiplied 95.3% in 0.1 ppm cresol, 73.5% in 0.5 ppm cresol 30.9% in 1 ppm cresol, 96.3% in 0.1 ppm potadine, 83.8% in 0.5 ppm potadine, 44.1% in 1 ppm
potadine, 73.5% in 0.1 ppm cresol and potadin, 41.2% in 0.5 ppm cresol and potadine and 16.2% in 1 ppm cresol and potadine in comparied to the control.
In batch activated sludge process, each of cresol and potadine was not effected in less than 0.1 ppm concentration, but the more concentration, the more inhibit the growth rate of activated sludge.
In the mixture of two disinfectants, the growth was more inhibited the effect of single disinfectants. So that this reaction is considered as addition effect of two disinfectants.
3. The removal rates of the disinfectants by activated sludge process were 77.6% in 0.4 ppm potadine, and in BOD was 85.6%.
4. It is desirable that the hospital wastewater is planed in order to be discharged to two systems separately, sewer from life system and wastewater from medical system.
From those results , it has been concluded that the hospital wastewater has to be treated safely by the activated sludge process.