수용성 고분자와 생분해성 계면활성제를 첨가한 부유버블에 의한 미세먼지 제거에 관한 연구

Abstract

This study on the floating soap bubbles conducted for removal of PM2.5 and PM10 fine particles. Biodegradable surfactants and water soluble cellulose polymers were introduced as bubble and film forming materials enable sustaining bubble life time. The duration time of the bubbles, aspects of floating time of bubbles as maintaining its spherical formation, were measured with bubbles made of different polymers and ratio of surfactants. The prepared solution has a pH range from 7.15 to 7.20, and surface tension has range from 29.90dyn/cm to 29.69~30.05dyn/cm, and the surface tension decreased as the added amount of surfactant increased. While the composition of bubble changes with surfactant and kinds of polymer and their added ratios, as the water soluble polymer added, the duration time increased 5 second at initial concentration to 521 second at final composition. Among the many different composition of bubbles, the longest duration time was obtained with sodium cocoyl apple amino acids 50vol% as a surfactant, hydroxypropyl methylcellulose(HPMC) 2 weight% and sodium alginate 0.5 weight% as polymers, and polyethylene glycol (PEG):Glycerol=1:3 solution 3 weight%. In order to measures the absorption amount of suspended fine particles by bubbles, the changes of falling time measured and calculate of mass of bubbles using the Stokes equation. In case of initial 700ppm of PM10 concentration maintained in the cylindrical chamber, the calculated PM10 adsorbed amount is as fallows, for 2.5cm of diameter is 0.28g/㎥, 2.7cm is 0.35 g/㎥, 3.0cm is 0.56 g/㎥ and 3.5cm is 0.93 g/㎥ respectively. Adsorbed amount tends to increase as diameter and PM10 concentration increases. A removal test was performed to determine the fine particle removal efficiency of the bubble. A fine particle meter and bubble sprayer were installed in the acrylic chamber (1.3m long 0.75m wide 1.7m high) and fine particle was supplied with smoke from mosquito-scented combustion. 1L of bubble solution was used in the experiment and the concentration change of fine particle was observed while spraying the bubble for 30 minutes. The total removal efficiency is 94% for bubbles, refer to PM10 was reduced from 930㎍/㎥ to 49㎍/㎥, while PM2.5 was reduced from 517㎍/㎥ to 27㎍/㎥.