서울과학기술대학교 고도수처리연구실

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Nano-composite materials for concentrate treatment from wastewater reuse (2017-2020)
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In this study, nano-composite materials having oxidation/reduction reactivity will be developed. Moreover, applicable process to adequately treat concentrate stream will be developed. Iron based composites materials will be used as Fenton reagent for organic oxidation, which is not readily biodegradable. Moreover, Nano-composite materials with catalyst will be used for denitrification processes. Hydrogen as well as electricity supply will be considered. Detailed research plan is as below.

1st year: Development of nZVI immobilization method and reactivity evaluaction

2nd year: Application of nano-composite materials for concentrate treatment

3rd year: Development of concentrate treatment process using nano-composite

Recoverable cesium-specific adsorbent materials (2017-2020)
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Prussian blue (PB) is known to be an effective material for radioactive cesium adsorption, but its nano-range size make it difficult to be applied for contaminated water remediation. In this study, a simple and versatile approach to immobilize Prussian blue in the supporting matrix via surface functionalization was investigated. The commercially available poly vinyl alcohol (PVA) sponge and cellulose filter was funcionalized by acrylic acid (AA) to change its major functional group from hydroxyl to carboxylic, which provides a stronger ionic bond with PB. The surface functionalization enhanced the attachment of PB, which minimized the leaching out of PB. These findings showed the excellent potential of the PB-PAA-PVA sponge as a cesium adsorbent as well as a versatile approach for various supporting materials containing the hydroxyl functional group.

Modified clay materials for VOCs adsorption (2017-2021)
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The aim of the research is to develop an effective adsorbent for VOCs generated from small scale industries. The natural clay was selected as supporting materials since it is cheap and widely available. Depending on VOCs characteristics, natural clay will be modified to have specific interaction with selected VOCs. The modified clay materials will be pelleted to be added in adsorption column for VOCs removal.

Novel application of nanoscale zero valent iron (nZVI) for sustainable water production (2017-2020)
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The aim of the research is to develop materials and a related water treatment process for extracted groundwater based on nanoscale zero-valent-iron(nZVI) as a chemical reducing agent for pollutants which are not treatable by biological or chemical oxidation. Emphasis is on solving the well-known problems of the nZVI application being ineffective delivery, short active lifetime and separation from treated water. Immobilization of nZVI combined with a protective surface coating is utilized to achieve this through combining granular activated carbon with an advanced synthetic polymer coating which provided a synergistic effect of the polymers’ adsorption capacity with nZVI reducing activity. The polymer protects nZVI from oxidation by oxygen and nitrate and leaching into the water

Superfine activated carbon for in-situ groundwater remediation (2018-2019)
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The aim of the research is to develop adsorbent materials for in-situ groundwater remediation. The materials should be fine enough to be injected into the ground and dispersed well in groundwater plume. The powdered activated carbon was further pulverized to produce superfine activated carbon. The physicochemical properties of superfine activated carbon are identified and the overall remediation performances are evaluated in terms of its mobility and adsorption capacity. The mobility of superfine activated carbon is further enhanced by surface modification.

Microplastic separation and sensing (2018-2021) %EB%A7%88%EC%9D%B4%ED%81%AC%EB%A1%9C%20%ED%94%8C%EB%9D%BC%EC%8A%A4%ED%8B%B1.PNG

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This study aims to develop a separation and analysis system for real-time monitoring of microplastics and to investigate their fate and transport in both environmental media and living organisms. The system that capable to selectively separate microplastics will be fulfilled in a microfluidic cell using separation phenomena, increasing the feasibility of paradigm-shift in the microplastic monitoring in the real environmental and organism samples. The developed monitoring technology will be optimized and improved for real-time monitoring of microplastics in various size, shape, and materials.