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嚴元擇 嶺南大學校 工業技術硏究所 1982 연구보고 Vol.10 No.1
A semi-continuous experiment using aerobic digestion process was attempted to investigate the change of characteristics of the initial stage of operation from night-soil treatment. Night-soil taken from collecting car were mixed, after filtering by using 5mm and 2mm sieves. Tank A was filled with 4 litters of raw night-soil, and tank B with mixtures of 2.8 litters (70%) of raw night-soil and 1.8 litters (30%) of activated sludge. Under aeration(3 l/l. min), these were drained by the rate of 200ml per a day from the tank A and B respectively and then raw night-soil was filled into the tank A and B with amount of 200ml. The supernatant obtained from centrifugal seperation (2000rpm, 20min) after taking out from tank A and B, were used for samples. Experiments were carried out for 50 days (1980. 8.18~10.7). The followings are results of this experimential study: 1) The effect of seeding sludge wat not observed after 20 days of aeration. 2) COD(Cr) showed the clarifing rate of 90% and COD(Mn) 80% after 25 days of aeration. 3) BOD was removed rapidly at the beginning of aeration and showed clarifing rate of 95% after 15 days. 4) The removal pattern for nitrogen (T-N, NH₃-N) was similar to BOD, and 95% clarifing rate of nitrogen was removed after 15 days. 5) The removal rate of phosophate (PO₄??) is low. 6) The pattern of Gel-Chromatogram and removal pattern of BOD, T-N and NH-₃N have close relationship.
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최정우,엄원택 嶺南大學校 工業技術硏究所 1983 연구보고 Vol.11 No.1
This study is aimed at experimentally determine the process through which the digestion tank reaches normal state and its efficiency thereafter at variable detention and lapse times in treating night soil by the aerobic digestion method. Experiments are run indoor. Samples are loaded in batches and digested for 5,10,15,20 and 25 days in the tank which is continuously aerated at constant temperature, air flow and return sludge rate. The following results are noted: 1. Digestion tank reaches normal state after 9, 8.6, 5.5, 2.4 and 1.9 cycles of operation for the detention time of 5,10,15,20 and 25 days, respectively, the longer the detention time the smaller the number of cycles. 2. Protozoa which primarily occur in the aerobic digestion process somewhat differ from those observed in the activated sludge process, Oikomonas being the prevalent species in the former. 3. Waste sludge stands at 6,5 and 7% when the sample is digested for 15,20 and 25 days, respectively, which indicates reduced cost of sludge treatment. 4. Treatment efficiency of better than 99% is attained in the removal of BOD regardless of the length of digestion time when BOD is loaded at the rate of 1.7Kg/m³.day and 0.7kg/SSkgㆍday 5. Treatment efficiency of better than 95% is attained in the removal of COD(cr) regardless of the length of digestion time when COD(cr) is loaded at the rate 4.0kg/m³.day and 0.4kg/SSkgㆍday 6. Over 94% of NH₄-N is removed by the aerobic digestion process when the sample is digested for 10 to 25 days, and as much of PO₄-³ removed when digested for 10 and 15 days. 7. The optimum digestion time is 15 days, which may be reduced to 10 days.
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