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Cartridge-type 이온교환섬유의 수처리 적용에 관한 연구
배상대 ( Sang-dae Bae ) 한국환경기술학회 2013 한국환경기술학회지 Vol.14 No.4
이 연구는 이온교환섬유를 Cartridge-type으로 만들어 흡착특성을 조사하였다. Pilot plant의 테스트를 위하여 이온교환섬유와 부직포와의 혼합비율을 7:3, 8:2와 이온교환섬유 100%를 필터로 사용하였다. 낙동강 원수 중의 Mg<sup>2+</sup>와 Ca<sup>2+</sup> 이온을 이온교환섬유 필터로 흡착실험을 한 결과, 파과시간이 각각 150분, 110분이며, 재생을 3회한 결과 110분, 80분이었다. 이 결과는 이온교환섬유와 부직포의 혼합비율에는 크게 관계없이 흡착-재생이 일어나, 이온교환섬유를 줄여 실제공정에 적용도 가능할 것으로 보인다. 재생실험에서도 Mg<sup>2+</sup>가 70~95%, Ca<sup>2+</sup>가 95%이상의 재생효율을 보였으며, 재생 시 HCl의 농도는 Mg<sup>2+</sup>가 0.05N, Ca<sup>2+</sup>가 0.025N로 기존의 10~40배 낮은 농도로 처리가 가능하였다. In this study, it was used ion exchange fibers to make a Cartridge-type and then searched about adsorption properties of Mg<sup>2+</sup> and Ca<sup>2+</sup> ion in a Pilot Plant. It was tested that the mixing ratio of ion exchange fiber and non woven were respectively 7:3, 8:2, and 100% ion exchange fiber was used as a filter. We carried out the adsorption experiments of Mg<sup>2+</sup> ion and Ca<sup>2+</sup> in the raw water of Nagdong river with an ion-exchange filter . As a result, breakthrough time of Mg<sup>2+</sup> ion and Ca<sup>2+</sup> was 150 and 110 minutes, and breakthrough time after 3 recycling times of Mg<sup>2+</sup> ion and Ca<sup>2+</sup> was 80 and 110 minutes. Not much difference the breakthrough time due to be mixed ratio of ion exchange fibers and non wovens, and it should be also used in an actual process. In recycling experiment, Mg<sup>2+</sup> showed recycling efficiency of 70~95%. and did Ca<sup>2+</sup> that of 95% and it was shown that Concentration of HCl required for recycling of Mg<sup>2+</sup> is 0.025N and Ca<sup>2+</sup> is 0.05N. After all, this process could be lower concentration 10 to 40 times than the existed processes.
활성탄과 생물여과 공정에서의 Chloral hydrate 제거 특성
배상대(Sang Dae Bae),손희종(Hee Jong Son),정철우(Chul Woo Jung) 大韓環境工學會 2008 대한환경공학회지 Vol.30 No.2
본 연구에서는 석탄계, 야자계, 목탄계 활성탄과 흡착능이 없는 안트라사이트를 이용하여 클로랄하이드레이트에 대한 흡착 및 생물분해 특성을 평가하였다. 활성탄 공정에서 클로랄하이드레이트의 제거기작은 운전초기에는 흡착이 높은 비중을 차지하나 부착미생물의 활성이 증진되면서 부착미생물에 의한 생분해와 흡착에 의해 제거되었으며, 클로랄하이드레이트는 생분해능이 큰 물질들로 조사되었다. 입상활성탄 재질별 클로랄하이드레이트의 제거 특성은 석탄계와 야자계 활성탄에서 제거율이 높았고, 목탄계는 상대적으로 낮은 제거능을 보였으며, 안트라사이트 biofilter에서 가장 낮은 제거능을 보였다. 활성탄 재질별 부착 미생물의 생체량과 활성도는 석탄계가 가장 높았고, 야자계, 목탄계, 안트라사이트 순으로 나타났으며, 수온 변화에 따른 클로랄하이드레이트의 제거 특성은 수온이 10℃ 이하로 저하될 경우 부착 bacteria의 생체량과 활성도 감소로 제거율이 감소하였다. 안트라사이트를 이용한 생물여과 공정은 수온의 변화에 아주 민감하게 변하는 양상을 나타내었으며, 이는 부착 bacteria에 의한 직접적인 생물분해가 주 제거 메카니즘이기 때문인 것으로 나타났다. 클로랄하이드레이트의 제거시 유입농도가 높은 경우에는 수온의 영향이 매우 중요하며, 흡착능이 소진된 활성탄이나 흡착능이 없는 여재를 사용한 생물여과 공정에서는 수온이 낮은 동절기에는 클로랄하이드레이트의 유출 가능성이 있었다. Coal-, coconut- and wood-based activated carbons and anthracite were tested to evaluate adsorption and biodegradation performances of chloral hydrate. In the early stage of the operation, the adsorption was the main mechanism for the removal of chloral hydrate, however as increasing populations of attached bacteria, the bacteria played a major role in removing chloral hydrate in the activated carbon and anthracite biofilter. It was also investigated that chloral hydrate was readily subjected to biodegrade. The coal- and coconut-based activated carbons were found to be most effective adsorbents in adsorption of chloral hydrate. Highest populations and activity of attached bacteria were shown in the coal-based activated carbon. The populations and activity of attached bacteria decreased in the order: coconut-based activated carbon>wood-based activated carbon>anthracite. The attached bacteria was inhibited in the removal of chloral hydrate at temperatures below 10℃. It was more active at higher water temperatures(20℃<) but less active at lower water temperature(10℃>). The removal efficiencies of chloral hydrate obtained by using four different adsorbents were directly related to the water temperatures. Water temperature was the most important factor for removal of chloral hydrate in the anthracite biofilter because the removal of chloral hydrate depended mainly on biodegradation. Therefore, the main removal mechanism of chloral hydrate by applying activated carbon was both adsorption and biodegradation by the attached bacteria. The observation suggests that the application of coal- based activated carbon to the water treatment should be the best for the removal of chloral hydrate.
이온교환섬유의 새로운 cartridge-type 개발 및 그 흡착특성
배상대 ( Sang Dae Bae ) 한국수처리학회 2011 한국수처리학회지 Vol.19 No.5
In this study, ion-exchange fibers to create a cartridge-type, and its adsorption properties were investigated. Properties for the purpose of the test formulation with ion-exchange fibers and nonwovens, respectively, 7:3 and 8:2 were produced as a filter. It was shown that as for adsorption of magnesium and calcius ions by ion-exchange fiber, magnesium ion is slower than calcium ion in the each solution. Also, in the mixture of the magnesium and calcium ions, the adsorption rate of magnesium ion was much slower than that of calcium ion. Finally, Ion-exchange fiber filter has a high adsorption capacity for 6-7 hours and a recycling capacity for 6-7 times, therefore it would be possible to be applied to water treatment.