• Proceedings of the Korean Geotechical Society Conference
• /
• 2010.09a
• /
• pp.1370-1376
• /
• 2010

In this study, usability and stability in the caisson filling material were reviewed that copper salg(one million tons per one-year) were produced by smelter. In order to complete these studies, chemical and physical comparing analyses were performed by sea-sand materials as to the materials suitability, After construction, the structural displacement of caisson was measured by the instrument and was examined for stability. As a result of analysis, it was determined that copper slag is eco-friendly, and can be used as recycled alternative to aggregates materials.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2014.05a
• /
• pp.210-211
• /
• 2014

Nowadays, as to reduce the emission volume of CO₂, blast furnace slag has been widely used to replacement of cement. Techniques about using industrial by-products has been extensively studied. For the previous study, blast furnace slag has been used with recycled fine aggregates. In thess study, considering about the different properties of blast furnace slag, as the change of blaine and chemical performances of blast furnace slag, the results of flowability and compressive strength has been analysed.

• Journal of Korea Technical Association of The Pulp and Paper Industry
• /
• v.37 no.4 s.112
• /
• pp.8-17
• /
• 2005

WCT (Wet compaction test) is a new fiber evaluation method developed recently by Seo and its test results can be used as a predictor for pulp quality and its paper property Bleached chemical pulps (SwBKP, HwBKP), recycled pulp (OCC), and mechanical pulp (BCTMP) were used for the furnishes to be tested by WCT We compared the WCT results to conventional fiber evaluation tests such as WRV (Water Retention Value), free ness, and fiber length in this study, and found that WCT always gave better regression coefficients in relation to pulp quality (drainage), and paper properties (density, tensile, tear, and burst strength). WCT may be used on-line in papermachine.

• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
• /
• 2006.06a
• /
• pp.73-78
• /
• 2006

The occurrence of detrimental substances in the paper machine leads to reduced economic performance of paper mills through reduced capacities due to increased paper breaks and cleaning times. In this article the latest generation of BASF's laser optical pitch particle counter is employed in the examination of a paper mill operating two paper machines and using a mixture of thermo-mechanical pulp and recycled fibres. The potential of the new instrument to differentiate between particles on the basis of size and chemical composition is discussed. In addition, direct evidence of the periodic and locational variation of detrimental substances in the paper machine is given. Finally, an example of the application of BASF's laser optical pitch particle counter in the selection of a suitable fixative system for a complex furnish is presented.

• Membrane and Water Treatment
• /
• v.4 no.2
• /
• pp.95-108
• /
• 2013

Metal ions exist in seawater, groundwater and industrial wastewaters. These source waters can be recycled if their concentrations are reduced. A number of processes can be applied for this purpose. Liquid-liquid extraction is one of the promising methods. In this paper, experimental results are presented on the removal of Cr(VI) using Aliquat-336, a reactive carrier, in sunflower oil (a non-toxic solvent). The performance of this new system is compared with those of kerosene (a toxic solvent). The extent of removal of Cr(VI) from samples with high and low concentrations are presented. The process was upgraded to a bench-scale module that can selectively remove about 50-90% Cr(VI) from samples of groundwater. Thus this process can produce water within the acceptable range for recycling and for use in secondary purposes such as irrigation.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2017.05a
• /
• pp.222-223
• /
• 2017

In the automotive industry, such as scrap metal and plastic scrap process is being recycled. Although the glass beads are used as road paving or other additives and processing crushing, recycling is known that there are limits. The utilization of waste glass was evaluated as a concrete admixture by using powder characteristics and chemical composition of the glass. As a result of using waste-glass powder as an admixture, it is difficult to expect the pozzolanic effect, but it is found that it can increase the fluidity of concrete and ensure the durability performance in the appropriate amount range.

• Journal of Korea Technical Association of The Pulp and Paper Industry
• /
• v.33 no.4
• /
• pp.1-6
• /
• 2001

Today's paper industry tries to use greater amount of high yield pulp and recycled fiber and to close mill water system, which results in higher fines content and buildup of organic and inorganic contaminants in white water system. Researches are being focused to develop chemical additives that provide good retention and drainage in a closed papermaking system. A microparticle retention system consisted of cationic guar gum and anionic colloidal silica so has been developed to meet the requirements for improving machine speed and product quality. The objective of this investigation was to determine the effects of the degree of cationic guar gums, charge density and structure of anionic colloidal silica sols, and the degree of system closure on the performances of this microparticle retention system. Cationic guar gums and anionic colloidal silica sols with higher charge densities showed better retention performance. Particularly, wider maximum in retention was obtained when structure colloidal silica was used suggesting as mechanism of microparticle bridging is functioning in this system.

• Proceedings of the Korean Society of Agricultural Engineers Conference
• /
• 1999.10c
• /
• pp.682-688
• /
• 1999

We threat sludge by heating methods with low pollution and high efficiency. Organic and inorganic components in Sludge can be almost removed through the heaging treatment process, and thefinal products are called artifical aoil or artificial media which are depended on temperature control. It can be recycled on the agricultural sites. Because it contained sort of organic matters while high heaging process with addition. To use them as agricultural materials, it need to know their characteristic transform in the nature. So we have planting bean and corn for two years with standard planting methods and to anticipate changing characteristics of artificial media and artificial soil by staying it natural condition, analyze it physical and chemical characteristics. This study will be contributed to reduce mass enviornmental problems by the treatment of Sludge and make it possible application for a agriculture use.

• Environmental Engineering Research
• /
• v.17 no.2
• /
• pp.65-67
• /
• 2012

The desorption characteristics of previously adsorbed indium ions on phosphorylated sawdust were tested by various chemical reagents such as HCl, $HNO_3$, NaCl, ethylenediaminetetraacetic acid, and nitrilotriacetic acid. Among them, HCl was chosen as the best desorbing agent in terms of economics. The desorption efficiency of HCl for indium ions was about 97% at a concentration of 0.5 M. The desorption efficiency for indium ions was very high at about 94% even at a solid/liquid ratio of 10.0, and the desorption process was quickly performed within 60 min. The removal efficiency of indium ions in recycled phosphorylated sawdust could be maintained at 85% in the 4th cycle.

• Advances in nano research
• /
• v.3 no.2
• /
• pp.67-79
• /
• 2015

Air stable nanoparticles were prepared from cobalt sulphate using tetra butyl ammonium bromide as surfactant and sodium borohydride as reductant at room temperature. The cobalt nanocolloids in aqueous medium were found to be efficient catalysts for the degradation of toxic organic dyes. Our present study involves degradation of Methylene Blue and Rhodamine-B using cobalt nanoparticles and easy recovery of the catalyst from the system. The recovered nanoparticles could be recycled several times without loss of catalytic activity. Palladium nanoparticles prepared from palladium chloride and the same surfactant were found to degrade the organic dyes effectively but lose their catalytic activity after recovery. The cause of dye colour discharge by nanocolloids has been assigned based on our experimental findings.