An experimental research was conducted in order to study the treatability of leachate and a combined wastewater of municipal landfill leachate and municipal sewage. The landfill leachate was that of Nanjido landfill site, and the municipal sewage was obtained from Chungnang municipal sewage treatment plant of Seoul. Several sets of bench-scale sequencing batch reactor(SBR) were used as experimental apparatus. Specially investigated items in this experiment were the removal efficiency of substrate and the influence of the hydraulic retention time(HRT). The experiment lasted for about 8 months. The result are as follows ; 1) The characteristics of leachate were pH 7.4∼8.1, BOD 280∼450 ㎎/1, COD 1300∼1350 ㎎/l, T-N 2021∼2110 ㎎/l, T-P 2.7∼3.2 ㎎/l, Cl- 3540∼4085 ㎎/l, and heavy metals are a very small amount. And the characteristics of sewage were pH 6.9∼7.3, BOD 78.4∼129.3 ㎎/l, COD 121.2∼305.0 ㎎/l, T-N 14.9∼36.4 ㎎/l, T-P 1.3∼5.9 ㎎/l. 2) The treatability of leachate alone was not treat well. So for the good treatment of leachate, it w;is necessary to deal with the pretreatment before biological treatment and a combined treatment of municipal sewage. 3) The various contents of the leachate were 5%, 10%, 30%, and 50%, and the removal efficiency of COD was 86.0%, 82.8%, 60.6%, and 31.7%. The maximum content of the leachate which could be successfully treated by SBR in the combined treatment eas 10% of that of sewage.

기술과 교육 과정의 변천 조사 과정에서 느낀점을 적어 보면 다음과 같다.중학교 기술 과목은 고도산업사회에 적응하여 문화시민으로서 생활을 영위해 나가는데 필요한 과목으로 과목성격에 맞도록 내용이 구성되어야 한다. 교육 과정에 여러 분야의 내용을 포함시켜 놓으면 그것이 하나의 지식체계로 조직되지 못할 것은 명백한 사실이다. 따라서 시대의 변화와 사회여건에 따라 어느 영역을 내용에서 넣고 빼는 식의 교육 과정이 될것이 아니라 과목을 구성하는 내용요소들이 하나의 지식체계로 편성되도록 연구되어야 한다.