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유동상 반응기를 이용한 반도체 폐수 내 불소 처리 시 CaF₂ 주입량, pH 및 처리수 재순환의 영향
안명기(Myeong Ki An),김진식(Jin Sik Kim),김금용(Keum Yong Kim),류홍덕(Hong Duck Ryu),이상일(Sang Ill Lee) 大韓環境工學會 2010 대한환경공학회지 Vol.32 No.6
본 연구에서는 유동상 반응기를 이용하여 고농도의 질소, 인 및 불소가 동시에 존재하는 반도체 폐수 내 불소 처리시 불소 제거효율 향상, 함수율 저감 및 생성 슬러지(CaF₂)의 순도 향상을 꾀하고자 하였다. 이를 위해 pH 및 seed 주입량, 유출수의 순환여부에 따른 영향을 살펴본 결과 유출수 재순환 시 불소제거효율, 슬러지 순도 및 함수율을 모두 고려할 경우 최적의 pH는 5, seed 주입량은 150 g으로 관찰되었다. 이때의 불소 및 인 제거효율은 94.24 및 8.97%로 나타났고, 함수율은 12.94%로 확인되었다. Seed 주입량의 증가는 불소제거효율을 증가시킬 뿐만 아니라 유출수 재순환 및 pH 변동에 따른 불소 제거효율 감소도 억제시키는 것으로 나타났다. The optimum condition for fluoride removal, water content reduction, and CaF₂ purity was determined in treating semiconductor waste water in which ammonia nitrogen, phosphorus, and fluoride are existed simultaneously using a fluidized bed reactor. Effects of pH, seed dosage, and recirculation of treated water were investigated through lab-scale experiments. Considering fluoride removal, sludge purity, and water content, that pH 5 and seed dose of 150 g were found to be optimum. Correspondingly, removal of fluoride and phosphate (PO₄ 3--P) was 94.24% and 8.97%, respectively, with water content ratio of 12.94%. Increase in an amount of seed dosage not only enhance fluoride removal efficiency, but also buffer fluoride removal-reducing effect due to the variation of recirculation ratio of treated water and pH.
안명기(Myeong Ki An),김금용(Keum Yong Kim),류홍덕(Hong Duck Ryu),이상일(Sang Ill Lee) 大韓環境工學會 2010 대한환경공학회지 Vol.32 No.5
본 연구에서는 반도체 폐수에 함유된 불소 처리 시 유동상 반응기 (FBR)을 이용하여 불소 제거 효율을 극대화 시키는 조건에서 발생하는 슬러지의 함수율을 최소화 시키고 CaF₂의 순도를 높이고자 하였다. 이를 위해 최적 pH 및 CA₂+ 주입 몰비 ([CA₂+]/[F-])가 도출되었다. 연구 결과 pH 및 CA₂+ 주입 몰비가 증가함에 따라 불소 제거효율은 증가하였으며, 최적 조건에서 79.8%의 불소제거효율이 관찰되었다. 불소 제거 효율이 최적인 조건에서 인 제거 효율은 약 9.3% 로서 불소 제거시 CA₂+과 PO₄3--P의 부 반응이 거의 발생하지 않아 높은 순도의 CaF₂이 침전 슬러지로 발생하는 것으로 나타났다. 또한 이때 슬러지 함수율은 약 19.3%로 매우 낮은 것으로 나타나 불소 제거, 슬러지 순도 및 함수율 측면에서 FBR은 매우 효과적인 불소 제거 공정인 것으로 나타났다. This work was initiated both to maximize purity of calcium fluoride sludge and to minimize water content in the settled sludge. The sludge was produced in the process of fluoride removal of semiconductor wastewater by the addition of CA₂+ ion. Fludized bed reactor(FBR) using calcium fluoride as a seed was adapted. Optimum pH and molar ratio of CA₂+/F- were determined in lab-scale study. The experimental results showed that fluoride removal was increased as pH and molar ratio of CA₂+/F- increased, with the best removal of 79.8% in an optimum condition. In the optimum point of fluoride removal, very low PO₄ 3--P removal of 9.3% was observed. It indicates forming CaF₂ crystal of high purity, when side reaction of calcium with phosphate was minimized. In addition, water content of settled sludge was 19.3%, which is relatively low compared to other fluoride removal processes. Consequently, the FBR process proposed in this study was very effective in fluoride removal, producing good sludge of high purity and less water content.
Alum 주입이 부착성장 공정의 처리효율에 미치는 영향
김진식 ( Jin Sik Kim ),안명기 ( Myeong Ki An ),김금용 ( Keum Yong Kim ),류홍덕 ( Hong Duck Ryu ),이상일 ( Sang Ill Lee ) 한국수처리학회(구 한국수처리기술연구회) 2011 한국수처리학회지 Vol.19 No.1
This work was aimed to evaluate the feasibility of utilizing alum in biological filter system for the enhancement of phosphorus removal performance. The optimum alum dosage was determined by jar-tests. The best experimental ortphophosphate (PO4-P) removal was observed at the Al3+/PO4-P ratio of 2.0. The addition of alum caused the outstanding enhancement of phosphorus removal in the BAF system. Furthermore, TCOD removal efficiency was increased by 14 %. The utilization of alum in the BAF system didn`t cause the inhibition of biological nitrification and denitrification reaction. Finally, the application of alum flocculation to biological treatment system can bring the positive effects on the removals of phosphorus and TCOD without the inhibition of biological nitrification and denitrification.
산업폐수에서 실증규모의 Modified Dephanox 공정의 최적 HRT 도출연구
강민구 ( Min Koo Kang ),김진식 ( Jin Sik Kim ),김규리 ( Kyu Ri Kim ),안명기 ( Myeong Ki An ),김금용 ( Keum Yong Kim ),이상일 ( Sang Ill Lee ) 한국수처리학회(구 한국수처리기술연구회) 2011 한국수처리학회지 Vol.19 No.1
This research tried to observe according to the change of the hydraulic retention time whether the Modified DEPHANOX process of applying the rotating biological contactor to the industrial wastewater through the process operating of the pilot scale maintained the nitrogen and organic compound the stable process efficiency considering in the industrial wastewater. In operating the Modified DEPHANOX process with the rotating biological contactor as the pilot-scale at the hydraulic retention time of 12 hrs, the nitrogen removal efficiency was 75%, the organic compound removal efficiency was 83%, and the phosphorous removal efficiency was 73% respectively. Despite the advantages of using Modified DEPHANOX with rotating biological contactor, this process was found to be ineffective when the sample industrial wastewater had a high concentration of toxic substance and oil. Therefore, in order to obtain stable nitrogen removal efficiency in these settings, further future studies may be necessary.