열적처리를 통한 건축폐기물 중 폐알루미늄(Al)의 회수

권기홍(Gi-Hong Kwon),이경규(Kyung-Kyoo Lee) 한국환경관리학회 2008 環境管理學會誌 Vol.14 No.4

혼합건축폐기물 중 재활용이 시급히 요구되고 있는 폐금속류인 알루미늄의 분리회수를 위한 연구결과 다음과 같은 결론을 얻었다. 현재까지 재활용되지 못하고 폐기되고 있는 건축폐기물 중 폐알루미늄의 구성성분은 유리 (40.0%), 실리콘(37.1%), 알루미늄(22.9%)으로 확인되었다 이들 구성성분 중 알루미늄을 분리할 수 있는 방법으로 열적처리가 효율적일 것으로 판단되었으며, 실험실적인 조건에서 전기로를 이용하여 실험한 결과 열적처리에 의한 온도범위는 500~550℃, 적정분리시간은 30분 정도 소요되는 것을 확인하였다. 이때 알루미늄 회수율은 90%이상을 분리회수할 수 있었다. 분리회수한 알루미늄의 화학적 성분을 분석한 결과, 순도는 약 99%로 시중에서 판매되는 알루미늄의 순도 범위안에 속하여 재활용이 충분히 가능함을 알 수 있었다. This study was performed to examine the separate collection of waste aluminum that are required urgently for a recycling among a board variety of building wastes. The results of this study are summarized as follows. It is reported that among a wide range of building wastes that have not been recycled so far, waste aluminum consist of glass (40.0%), silicon (37.1%) and aluminum (22.9%). The thermal treatment method was considered to be effectively used for separating aluminum from these components. When an experiment was carried out using an electric furnace under testing conditions, therefore, the results showed that the temperature range of the thermal treatment was 500-550℃ and the proper separating time was approximately 30 minutes. It was shown, then, that the separation rate of the aluminum component was 90% or more and the degree of its purity was approximately 99% which is equivalent to that of aluminum on the market. As a result, it was found that those waste aluminum could be available for recycling.

도금슬러지를 첨가하여 제작한 벽돌의 재활용 가능성 평가

권기홍(Gi-Hong Kwon),백창웅(Chang-Wuong Back) 한국환경관리학회 2004 環境管理學會誌 Vol.10 No.1

鍍金슬러지의 溶出特性에 關한 硏究

권기홍(Gi-Hong Kwon),조병락(Byeuns-Rak Cho),서유덕(You-Duck Suh) 한국환경관리학회 1998 環境管理學會誌 Vol.4 No.2

固化處理物의 埋立에 따른 長期溶出特性

권기홍(Gi-Hong Kwon),정동준(Dong-Jun Jeong) 한국산업융합학회 1998 한국산업융합학회 논문집 Vol.1 No.1

This study was carried out to investigate the leaching characteristics by the landfill of solidified sludge. pH of leachate was 3.7 - 5.8 and 8.0 - 10.4 in each column using sand as a top-soil layer on filled municipal waste and solidified cake. NH₃-N in leachate was increasing in the each column using sand as a top-soil layer on filled dewatered sludge and solidified cake, but decreasing in the each column using sand and solidified cake by top-soil layer on filled municipal waste. Also the concentration of NO₃-N was on the way of stabilizing but was difficult to find any tendency until now. Zn and Mn in leachates were the highest in the column filled with the solidified sludge, Cr, Pb and Cd were low concentration at each column.<br/>

염색폐수처리슬러지를 이용한 경량골재 제조에 관한 연구

권기홍(Gi Hong Kwon),남창모(Chang Moo Nam),임수택(Soo Taek Lim) 한국환경관리학회 2006 環境管理學會誌 Vol.12 No.4

This study was conducted, in preparation for incineration of dyeing wastewater treatment sludge, to determine the physical properties of sludge generated after treating dyeing wastewater, and the physical properties and compressive strength of lightweight aggregate made from ashes of incinerated dyeing wastewater treatment sludge, in order to evaluate the recyclability of the ashes as lightweight aggregate. The results of this study are summarized as follows. In terms of the thermal properties of the sludge, there was a primarily slight exothermic peak at the heating temperature of approx. 329℃, followed by a significantly great exothermic peak at approx. 510℃, and then decomposition ended. Then, lightweight aggregate was made to determine its compressive strength. It was identified that the range of its compressive strength, in which it can be used as materials for civil engineering works, was over approx. 2㎏f/㎠. In conclusion, the dyeing wastewater treatment sludge can be recycled as lightweight aggregate as well as lightweight bricks. In addition, lightweight aggregate and bricks made from the sludge can be widely used in building public facilities and paving roads, as is the case with some foreign countries.

전자산업에서 발생되는 유해 산 폐액 중 구리의 회수

권기홍(Gi-Hong Kwon),남창모(Chang-Mo Nam),김동원(Dong-Won Kim),성병주(Byung-Joo Sung) 한국환경관리학회 2008 環境管理學會誌 Vol.14 No.3

전자산업에서 발생되는 유해 폐산의 재활용은 환원ㆍ산화, 정제, 여과 과정을 거쳐 환원공정에서는 구리를, 최종공정에서는 염화제이철(FeCl₃) 을 회수하고 있으나, 환원과정에서 얻어진 구리의 경우 순도가 낮아 제 가격을 받지 못하고 있는 실정이다. 따라서 본 연구는 폐산의 재활용공정 중 환원과정에서 얻어진 구리의 회수율 증대를 위한 연구를 수행한 결과 다음과 같은 결론을 얻었다. 구리 회수율 중대를 위한 방법으로 수세척을 이용하고 세척회수 2회, 구리 slurry와 세척액량의 비 30 : 100, 세척 및 침전시간 각각 30분, 세척조 하부 blowing하는 조건으로 운전한 결과 구리 순도율(수분 포함)은 세척 전에는 평균 62.8%였으나 세척 후에는 평균 80.4%로 약 18%의 순도가 향상된 것으로 확인할 수 있었으며, 세척과정에서 발생된 세척액의 성분분석 결과 농도는 낮지만 Cr, Pb 등의 중금속물질이 포함되어 있어 적정한 처리가 필요할 것으로 판단된다. 결론적으로 기존의 공정에서 세척 회수, 구리 slurry와 세척액량의 비, 세척 및 침전 시간의 적절한 조합으로 충분히 회수율을 높일 수 있음을 확인하였다. Hazardous acid wastewater generated at electronic industries can be recycled and reused after going through the procedures of reduction, oxidization, purification and filtration, Then, the Cu can be recovered in the reduction process and the iron chloride (FeCl₃) in the final process, respectively. Because the recovered Cu has a very low degree of purity, however, its fair and reasonable price can not be established. This study was performed to improve the recovery of Cu in the reduction process during the recycling and reuse of acid wastewater. The result of this study is summarized as follows. Water washing was used as a method to improve the Cu recovery with the following conditions: Twice washing recovery, the ratio of Cu slurry to washing solution: 30:100, washing and precipitation time: each 30 minutes, and blowing under the washing bath. Then, it was shown that the average purity degree of recovered Cu(including water) accounted for 62.7% before washing, and 80.4% after washing. There was the increase of approximately 18% in the Cu purity. When chemicals of washing solution were analysed after washing, the findings showed that such heavy metals as Cr and Pb were contained in very low concentration. It seems that they have to be treated in a proper way. In conclusion, the finding showed that it should be possible to improve the recovery by properly combining the existing procedure with these conditions: Washing times, ratio of Cu slurry to washing solution, washing and precipitation time.

도금슬러지의 고형화특성에 관한 연구

권기홍(Gi-Hong Kwon),조병락(Byeung-Rak Cho) 한국환경관리학회 2001 環境管理學會誌 Vol.7 No.1

병원폐기물 중 폐합성수지류의 물성 및 멸균에 관한 연구

권기홍(Gi-Hong Kwon) 한국환경관리학회 2002 環境管理學會誌 Vol.8 No.4

혼합캡폐기물 중 유가금속의 분리에 관한 기초적 연구

권기홍(Gi-Hong Kwon),이경규(Kyung-Kyoo Lee) 한국환경관리학회 2007 環境管理學會誌 Vol.13 No.4

현재까지 대부분 폐기되고 있는 폐음료용 용기의 캡에서 유가금속인 알루미늄을 분리회수하기 위한 연구결과 다음과 같은 결론을 얻었다. 유가금속의 회수를 위한 캡 내 liner의 제거방법으로는 열적처리방법은 파쇄ㆍ절단에 의한 방법보다 작업성이 간편하고 금속의 회수율이 우수한 것으로 사료되며 최적운전조건은 약 500℃에서 10분에서 열적처리하고 이때 발생하는 미연분을 모아 제거할 수 있는 연소실 및 대기오염 방지시설을 설치하여 적정처리를 통하여 대기오염을 감소시킬 수 있는 방법을 강구하는 것이 효과적 일 것으로 사료된다. The purpose of this study is to find some methods needed to separately collect a valuable aluminum cap from used metal drink bottles. Some methods for removing a liner within the cap were found to collect aluminum as a valuable material from used metal drink bottles. It was shown that a heat-treating method among them was easier to work and better to collect the metal than a crushing and cutting method did. The optimal condition for operation was at the temperature of 500℃ and for the duration of 10 minutes. To do the work effectively, then, it is required to take proper actions for preventing air from being polluted by being equipped with combustion and air pollution preventing facilities.

염색슬저지 연소재를 이용한 보도블록의 제작과 물성평가

권기홍(Gi Hong Kwon),임우성(Woo Sung Lim) 한국환경보건학회 2004 한국환경보건학회지 Vol.30 No.2

In this study, we carried out the research for the recycling potential of the dyeing wastewater treatment sludges as construction materials. The incineration ash of sludges were solidified as interlocking block in condition of sludge/cement ratio 2.5%, 5.0% and 10%, respectively. Those interlocking blocks were cured for 3days, 7days and 28days in ambient air condition, respectively. The results of this research were summarized as follows: The dyeing wastewater treatment sludges was below the Korea Leaching Limit. After incineration, the ash was manufactured as interlocking block. Bendable strength over 50 kgf/cm2 suitable for interlocking block was obtained only when the sample was cured for 7days at sludge/cement ratio 2.5% and 5.0%. Hygroscopic ratio of interlocking block was above the Korea Industry Standard. We think that recycling of the incineration ash from dyeing wastewater treatment sludges to interlocking block will have high potential possibility.