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분뇨(糞尿)및 도시고형폐기물(都市固形廢棄物)에 의한 퇴비화(堆肥化) 실험보고(實驗報告)(2)
김수생 ( Soo Saeng Kim ) 東亞大學校附設 石堂傳統文化硏究院 1979 石堂論叢 Vol.3 No.-
The experiments for composting by using municipal night soil and refuse in Korea were carried out for the following objectives; a. To quantify and analyze typical South Korean urban and rural community nightsoil and refuse b. To conduct compositing tests of several variables ander controlled conditions c. To carry out prototype experiments under field conditions d. To perform agricultural trials using the nightsoil/refuse humus product e. To conduct a cost-effectiveness analysis on the overall system f. To design a full-scale collection, treatment, and refuse scheme for the rural town of Kimhae Of these objectives experiments concerned with a tod have been conducted this year and the conclusions made at the intermediate stage are as follows (the forthcoming conclusions and other supplements will be given in 1979). 1. The designing values of nightsoil for city and rural town are 0.6 1/c.d and 0.4 1/c.d respectively. Nightsoils used in the composting process should have about 50%-60% of water content and 27 of C/N ratio. In particular, more than 60℃ of self-developed heat in nightsoils should be maintained to kill germs with the origin of a desease. 2. The average quantity per anmum of municipal refuse in Korea is found to be 0.800kg/c.d. The refuse contains about 22% of water content and about 20% of materials that can be used for composting, The water content of this refuse is, however, increased to about 50%-60% by mixing the collected refuse with nightsoil in three seasons except for winter. 3. It is shown that the addition of at least 2 to 3% of agricultural refuse with a high C/N ratio is required for the synthetic compo sting of the refuse and nightsoil obtained in winter. 4. pH in the process of composting should be maintained in a weak alkali state. The lower the water content within the range 30 to 60%, the more rapid the initial developed-hezt is obtained, but the temperature of this heat is maintained only for a short-period of time. The higher the water content, the slower the maximum temperature is reached and the longer the temperature is maintained. 5. In the composting of municipal refuse in Korea, the aerobic condition is better than anaerobic condition in terms of the self-developed heat and has advantages smell, the maintaining of vent in a pile of compost being very important. In this respect the composting method using the refuse in an initial state is found to be better than that using the refuse crushed and passed through 5 cm-sieve. 6. The compost thus produced prover to be good in growing raddish, cabbage, etc.
국내(國內) 환경시설(環境施設)의 경제성(經濟性) 검토(檢討) -분뇨처리장(糞尿處理場)을 중심(中心)으로-
김수생 ( Soo Saeng Kim ) 東亞大學校附設 石堂傳統文化硏究院 1983 石堂論叢 Vol.7 No.-
This study examined the economics on Nightsoil Treatment Plants of domestic environmental facilities which have been constructed in this country. The results obtained are summarized as follows: 1. In case of the unit cost of domestic nightsoil treatment plants, the large-sized urban type plants constructed by the foreign loan require construction cost more excessively than the plants constructed by the domestic capital. Therefore, it is desirable to recheck the design of the plants by the foreign loan. 2. In case that nightsoil treatment plants are large-size, Anaerbic system is superior to Aerobic system in the part of the construction and operation cost. Therefore, it is advantageous to make the nightsoil treatment plants, if possible, large-sized and Anaerobic. 3. Because of not only the excess cost of construction and operation but the lack of practical technicians and techniques for maintenance and management, it seems to be the time that the constructions of small-sized nightsoil treatment plants in future in the country are necessary to convert the new economical treatment method, composting for example.