This study was performed to investigate the utilization of waste concretes for neutralization and removal of heavy metals in plating wastewater, because waste concretes have been known to be very porous, to have high specific surface area and to have alkaline minerals such as calcium. The results obtained from this research showed that waste concretes had a buffer capacity to neutralize an acidic alkali system in plating wastewater. Generally, neutralization and removal rate of heavy metals were excellent in the increase of waste concrete amounts and a small size. Because a coefficient of correlation was high, it seemed that removal of heavy metals could be explained by Freundlich and Langmuir isotherms. If we reflected the adsorption capacity(k) and adsorption intensity(l/n) of Freundlich isotherm, we couldn`t consider waste concretes as a good adsorbent, But, we could know that waste concretes were capable of removing a part of heavy metals. In point of building waste debris, if waste concretes substituted for a valuable adsorbent such as actviated carbon, they could look forward to an expected economical effect.

작약(芍藥) 분주묘(分株苗)의 활착불량(活着不良) 실태(實態)와 원인(原因)을 구명하기 위하여 시험 연구한 결과는 다음과 같다. 1. 작약 분주묘의 농가 포장 활착 실태 조사 결과 활착불량 피해율은 32%에 이르고 외형적 피해 실태는 무출현(無出現) 5.6%, 출현후(出現後) 고사(桔死) 20.7%, 출현후(出現後) 위조가 5.7%였다. 2. 활착불량 피해 정도별 농가 실태는 71%이상 피해를 본 필지가 4%, 70~41% 피해는 13%, 40~11% 피해는 45%로 많은 면적이 활착불량으로 인하여 결주가 된 것으로 나타났다. 3. 농가포장에서 정식시기에 따른 활착불량(活着不良) 피해율(被害率)은 가을 정식의 경우 18.2%인데 비하여 봄정식은 42.9%로 매우 높았고 실생묘(實生苗)보다는 분주묘(分株苗)에서 피해가 더 많았다. 4. 분주후 정식까지의 경과 일수가 길수록 생육과 수량이 크게 떨어졌고 봄정식시는 활착율이 66.7%로서 매우 낮았으며 종근소독과 토양살충제 혼용처리시 생육과 활착이 양호하였으나 무처리는 불량하였다. 5. 작약 분주묘의 활착불량(活着不良) 주원인(主原因)은 뿌리썩음병(Cylindrocarpon sp.)과 불량종(不良種) 묘(苗)로 나타났다.

3차원 수치고도지도 및 TIN모듈을 이용하여 SCS법에 의한 유효강우량 산정방법을 제안하였다.유역사면경사 증가에 대한 유출곡선지수의 증분치(2%, 3%)를 고려하여 유효강우량을 산정한 결과, 호우사상에 따라 약 5.90%~12.0%의 차이를 나타내었다. 따라서 우리나라 대부분의 하천유역과 같ㅇ. 고도차가 큰 일반 산지하천유역에서 SCS법에 의한 유효강우량 산정시에는 유역사면경사를 고려한 해석이 보다 합리적인 것으로 판단되었다.

This study was conducted to investigate the treatment of wastewater from acetaldehyde manufacturing plant by activated sludge process with Micrococcus roseus AW-6, Micrococcus luteus AW-22, Microbacterium lacticum AW-38 and Microbacterium laevaniformans AW-41. The COD_Mn and BOD_5 of the wastewater were 5,260㎎/L and 6,452㎎/L, respectively. pH was 1.85. The main organic component in the wastewater was acetic acid which was contained 67,600㎎/L. Optimum dilution time for activated sludge process was shown 10 times. The specific substrate removal rate(K_e) was 1.95day^-1 and the nonbiodegradable matters(S_n) were 23.2㎎/L. Saturation constant (K_e) and maximum specific growth rate(q_max) were 1,640㎎/L and 2.33day^-1, respectively. Sludge yield coefficient(Y) and endogenous respiration coefficient(K_d) were 0.28㎎ MLVSS/㎎COD and 0.02day^-1, respectively. COD_cr removal efficiency was 91% for 1.95day of hydraulic retention time.

The clogging phenomenon in the fixed film reactor is shown when biomass growth is excessive for long operating time. In addition, effluent water quality gets worse because of detachment of biomass. In this study, we conducted air - backwashing to sustain biomass in reactor to complement these defects. The results of experimental are showed in the following conclusion. The detachment rate was 19.5 - 38.0 % when the organic loading rate was 0.40 - 1.32 ㎏ COD/㎥/day, the air - backwashing intensity was 2 L/min(6.7 ㎥/㎡/hr) and the backwashing time was 15 - 19 seconds. And the detachment rate was 32.2 - 58.6 % when the organic loading rate was 1.37 - 2.27 ㎏ COD/㎥/day, the backwashing time was 1 - 12 minutes. As organic loading rate and backwashing time are increased, detachment of fixed biomass is increased. The detachment equation with detachment rate(DR, %), backwashing time(BWT, min), fixed biomass concentration(FB, ㎎/L), and organic loading rate(OLR, ㎏ COD/㎥/day) through multiple linear regression was given by the following equation: DR = 17.964 BWT^0.41407 FB^0.0597 OLR^0.1945

The purpose of this study is to suggest the spatial model which can be applied to the tourism farm plan. This study includes : (1) the analysis of existing facilities and activities of 22 tourism farms in Kyunggido and (2) the survey questionnaire about user's attitudes in 3 tourism farms. The results can be summarized as follows : 1) The .Major activities in the tourism farm are the resting/playing based on the natural environment and group meeting. 2) Average area is 17879.4uf (5418 坪). The most frequent facility is restaurant and lodge. 3) It is necessary to propose various types of tourism farm considering both natural conservation and development of rural region and users'various wants. The tourism farms are officially classified into four types Natural education type, Mind and body training type, Weekend farm type, Recreation type. 4) The space for tourism farm is divided into an area of production, and area of processing, and an area of convenience/recreation. 5) It is desired the convenience facilities are located in front of a farm, and the area of production is located at the back of a farm, and simple rest facilities are located all of the farm. 6) The weekend farm model and processing/convenient facility model are proposed in this study. Three types of the weekend farm models are proposed - simple type, composite type, and garden type. Three types of the processing/convenient models are proposed one building type, adjacent building type, and scattered building type.

고품질(高品質) 택사(澤瀉)의 다수확(多收穫)을 위하여 시비양(施肥量)에 따른 택사(澤瀉)의 생육(生育) 및 유효성분(有效成分)인 alisol-B monoacetate의 함양변북(含量變北)를 조사(調査)한 결과(結果)는 다음과 같다. 시비양(施肥量)의 증가(增加)는 지상부(地上部)의 생육증진(生育增進)에 효과적(效果的)이었으며 수양(收量)은 20-10-20 구(區)에서 가장 높은 287kg/10a 정도로 관행(慣行) 시비구(施肥區)보다 약 25% 증수(增收)되어 가장 높았으나30-15-30 구(區)는 20% 증수(增收) 되었다. 시비양(施肥量)에 따른 식물체중(中) 질소(窒素)와 린산(燐酸)함량은 증비(增肥) 할수록 줄기보다 잎의 함량이 높았으나 기타 무기성분(無機成分)은 대차없었다. 유효성분(有效成分)인 근경(根莖)내의 alisol-B monoacetate의 함양(含量)은 증비(增肥)할수록 함량이 증가되는 경향으로 30-5-30 시비구(施肥區)에서 4737.6ppm 으로 관행시비구(慣行施肥區)보다 66% 증가(增加)되었다.