• Economic and Environmental Geology
• /
• v.15 no.3
• /
• pp.113-122
• /
• 1982

The surveyed Boseong river, flows from south to north crossing Boseong gun Mirukg myon, Nodong myon, Yuleo myon, Bocgnae myon, Mundeog myon, and Seungju gun Nam myon, Jeonranam do. The geology of the surveyed area consists of age-unknown composite gneiss and schist, crystaline chlorite gneiss, porphyroblastic gneiss and granite gneiss, and metasediments of Myon Bong formation and Seologri formation. These metamorphic rocks are intruded by cretaceous biotite granite, granodiorite, and quartz diorite. The heavy sands occur in Quarternary alluvium and colluvium. The composition of the river bed is sand 60%, gravel 30%, and clay 10%. The gravel content of the river bed decreases as the increases. The average depth of auger boring is 0.87 m. The average heavy mineral composition of the heavy sand is monazite 6.83%, zircon 4.88%, ilmenite 11.36%, magnetite 8.36% and garnet 4.84%. The best heavy minerals separation procedure would be primary treatment of the sand by humphrey spiral and table, and retreatment of the table concentrate by magnetic separator. The minimum economically feasible capacity of gravity and magnetic separation plant would be 500 ton/hr when only the heavy minerals are recovered but it may be reduced to 100 ton/hr. capacity, if gravels and sands are added to the valuable products.

• KSBB Journal
• /
• v.18 no.3
• /
• pp.234-238
• /
• 2003

Biofilm process is preferred to activated sludge process in small domestic wastewater treatment plant because of its simplicity in operation and maintenance. Column reactor filled with waste ceramics and with waste plastics was used to remove pollutants in restaurant wastewater. COD removal at 18 hours of hydraulic retention time (HRT) gave 93.7%, COD removal during the experimental period, where maximum COD removal was observed. Under same condition, average removal of total nitrogen and total phosphorus were 82.3% and 25.9%, respectively Organic and nitrogen were efficiently removed with the HRT of 18 hours or more.

• Mycobiology
• /
• v.28 no.3
• /
• pp.123-126
• /
• 2000

Sodium hypochlorite alkaline was tested against Pseudomonas tolaasii causing bacterial blotch on cultivated oyster mushroom (Pleurotus ostreatus). The minimum inhibitory concentration of sodium hypochlorite against P. tolaasii contained active chlorine (AC) at 1.4 mg/l on plate assay. The highest cultivation yield was obtained from the treatment of AC 5.7 mg/l. Treatment of sodium hypochlorite at the rate of higher than AC 11.4 mg/l resulted in reduced yields at the harvest. However, the population of total bacteria on the bed surface treated with AC 5.7 mg/l of sodium hypochlorite was maintained to some extent. Inhibitory concentration against total bacteria on the bed surface was over AC 22.8 mg/l. Mushroom mycelium was damaged and its growth strongly inhibited at the concentration of AC 200 mg/l. Mushroom caps showed yellowish symptom by chemical injury by treatments of AC 74.1 mg/l or higher. Sporocarps infected by P. tolaasii were irrevocable at any concentration of sodium hypochlorite. Routine watering with AC 5.7 mg/l from mushroom initiation to the end of picking resulted in reduced bacterial blotch incidence of 40% and 86% at two mushroom farms. The treatment resulted in higher quality mushroom production compared to that conventionally watered with tap water alone.

• Economic and Environmental Geology
• /
• v.5 no.4
• /
• pp.211-217
• /
• 1972

The Second Yeon Hwa Mine which belongs to a so called Lead-Zines Belt Area in the central east Korea is located at about 10 km northeast of the Seogpo railway station on Yeongdong Line. The exploitation of the mine started in June, 1969 and furnished the machinary ore dressing plant in November, 1971. The current monthly production of rude ore is 15,000 meteric tons. The results of the study on the lead-zinc-copper deposits of the Second Yeonhwa mine are summerized as follows: (1) main ore deposits of the mine are localized in the Pungchon Limestion formation of Cambrian age, (2) related ingneous rock with ore deposits is granite porphyry, which distributed in NS and $N50^{\circ}W$ trend, (3) ore solution ascended along the $N50^{\circ}W$ trend which represents folding axis and fault plane and mineralized selectively in the limestone formation. (4) high grade ore deposits are localized in concave and convex boundaries of granite porphyry, and hanging walls of shale bed ($P_2S$ shale bed) in Pungchon Limestone formation and (5) skarn minerals are consisted of garnet, hedenbergite, diopside, and sulfide minerals are composed of zincblenede, galena, phyrhotite, pyrite and some amount of chalcopyrite and arsenopyrite.

• Journal of Korea Soil Environment Society
• /
• v.5 no.2
• /
• pp.99-105
• /
• 2000

The purpose of this study was to show the application of the Biofilter for treatment of the soil contaminated by lead and to investigates the effect of the biofilter on the retardation of lead with pilotplants that were simulated with different media and the number of bed. and to testify the inoculation by seeding microbes. The ratio of the degradation of soil contaminant was verified as CODcr/TOC in order to find a variation of the stabilization index in soil. The Biofiltration was one of biological processing methods for treatment. The contaminants were transported through the biofilter that was filled with the media. The surface of media formed biofilm which was surrounded by microbes and through its boundary, some materials were exchanged and migrated into the cell of microbes in an orderly manner. To investigate the effect of the Biofiltration, contaminated soil with lead nitrate of 1000mg/kg in dry was made artificially. The tests were simulated such as compost, Bioceramic and compost with bioceramic by 7:3 in weight. The bed consisted of three layers in order to find effect of the number of bed. Aspergillus niger was used as a biosorbent could probe the effect on the retardation of lead.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.33 no.1
• /
• pp.54-58
• /
• 1988

To define natural embryo growth and germination of the Korean ginseng (Panax ginseng C.A.Meyer) seed, freshly harvested and depulped seeds were seeded on nursery bed at Aug. 5 without stratification. At 100 days after seeding, embryo/endosperm length ratio of the seeds in nursery bed was higher than that of the seeds which were stratified with conventional method for 100 days. And also there was no significant difference between dehiscence ratio of the seeds in nursery bed and that from stratification with sand. The germination ratio of the ginseng seeds seeded without stratification at Aug. 5 was about 57% in average of 2 years and was not significantly lower than that of the seeds seeded after stratification at Nov. 15. And there were also no significant differencies of plant growth after germination between the ginseng seedlings from two seeding methods.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.22 no.6
• /
• pp.758-765
• /
• 2016

In this study, wave damping due to a permeable bed of finite depth was modelled using a complementary mild-slope equation for stream function. The energy dissipating term in the mild-slope equation was presented in terms of stream function. In order to prevent re-reflection of reflected waves along the outer boundary, a delta-function-shaped source function was derived to generate a wave in a computational domain. Numerical experiments were conducted to measure the reflection coefficient of waves over a planar slope for various incident wave periods. The numerical result of the proposed model was compared with that of an integral equation method, showing good agreement in general. However, the proposed model showed relatively higher transmission rate for the larger permeability and the longer wavelength.

• Journal of the Korean Institute of Landscape Architecture
• /
• v.34 no.3 s.116
• /
• pp.79-90
• /
• 2006

Tamarix chinenis blooms twice a you and its flowers, branches and leaves make the adjustment of tree shape. Propagation methods and growth characteristics of T. chinensis were studied in order to ascertain its potential use as one of vegetation resources for coast forestation and landscaping. The study results indicated that 1 or 2 you old hard wood cuttings showed higher rooting ratio than greenwood or semi hard wood cuttings. One to one mixture between vermiculite and pearlite appeared to be the best for bed soil, and sea sand and silt(loess) mixture was the next. Sea sand and granitic soil followed after. In terms of seasonal differences, spring cuttings showed the best rooting ratio, root number, and root length. Fall cuttings followed after spring cutting, and summer cuttings showed worst results regarding rooting ratio, root number, and root length. The best rooting promotion effects of growth regulators were observed with sea sand bed soils. There was no significant difference among growth regulators in terms of rooting and shoot growth. Low concentration below 100 ppm of growth regulators was enough for rooting promotion effect. In general, the number and mean length of roots and shoots were showed the excellent records in the sites with high rooting ratio. The study result strongly showed that T. chinensis can be considered as a suitable tree for coast forestation and landscaping because of its easy cutting propagation and rapid growth on saline lands.

• Proceedings of the Korean Institute of Resources Recycling Conference
• /
• 2005.10a
• /
• pp.47-58
• /
• 2005

Rice straw is one of the main renewable energy sources in Korea, and bio-oil is produced from rice straw with a lab. scale plant equipped mainly with a fluidized bed and a char removal system. We investigated how the reaction temperature affected the production of bio-oil and the efficiency of a char removal system. To elucidate how the temperature depended on the production of bio-oil, experiment were conducted between $450^{\circ}C\;and\;600^{\circ}C$ with a feed rate of about 300g/h. The mass balance was established in each experiment, and the produced gas and oil were analyzed with the aid of GCs and a GC-MS system. The char removal system is composed of a cyclone and a hot filter. In the experiments, we observed that the optimum reaction temperature range for the production of bio-oil is between $450^{\circ}C\;and\;500^{\circ}C$.

• Resources Recycling
• /
• v.24 no.5
• /
• pp.3-14
• /
• 2015

This study investigated that status of domestic and international furnace desulfurization and desulfurization characteristics of limestone for fluidized bed use depending on the technology for CFBC one of the CCPs. Limestone-based desulfurizing agent is one of the superior elements which are optimal at around $850-950^{\circ}C$ on high temperature desulfurization. And effectiveness of desulfurization process can be determined by the desulfurization experiment method such as diffusion reaction of the diaphragm of the absorber surface, the size of the particles, the pores of the quantity, size and structure. And, desulfurization efficiency depending on geological and crystallographic properties and calcination process of limestone needs additional research in the future.