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정종태 ( Jong Tai Jung ),김희영 ( Hee Young Kim ),최선영 ( Seon Yeong Choi ),김진한 ( Jin Han Kim ) 한국수처리학회 2014 한국수처리학회지 Vol.22 No.4
This study was performed to evaluate the treatability of food wastewater using Single phase and Two phase anaerobic digestion by separated on the acid with the methanogenic production. When experiments were carried out, digestion temperature was set as a mesophilic digestion which was 33.8~33.4℃(condition 1) and 37.1~38.4℃(condition 2). The period of Start-up was about 13 to 14days, and HRT(Hydraulic Retention time) was 10days. Digestion was carried out with two conditions, it was 22 days and 18 days at each condition. After 9 days in condition 1, the characteristic stage of the methane fermentation was showed by the difference of inflow and outflow of PH, however, it was not realized the stabilization because of short HRT. The experiment of Condition 2 conducted the operating temperature of with the sufficient start-up. TCOD removal efficiency of two-phase anaerobic digestion is higher than single anaerobic digestion; condition 1 was 2.6%, and condition 2 was 3.0%. With increasing temperature in the digestion, TCOD removal rate of the single anaerobic digestion was 15.4% and two-phase anaerobic digestion 15.9%, respectively. According to those results, the organic removal ratio of digestion seems to be affected by changing of digestion temperature.
혐기바이오비드를 이용한 UASB 반응기의 제지폐수 처리특성
정종태 ( Jong-tai Jung ),한상윤 ( Sang-yun Han ),정은호 ( Eun-ho Chung ) 한국수처리학회(구 한국수처리기술연구회) 2018 한국수처리학회지 Vol.26 No.3
In this study, Anaerobic beads with 0.85~1.45 ㎜ diameters were produced by direct injection and mixing(100 rpm for 3 minutes) of anaerobic sludge 200 ㎖(average MLSS concentration 38,000 ㎎/L) and 1.5% sodium alginate solution. The paper wastewater treatment of the sequencing batch reactor with anaerobic biobeads could achieve about 85% COD removal after 6 days. With this remarkable results of this study, it can apply to the way of the removal efficiency stabilization and starting up of the UASB reactor because it didn’t happen the sludge rising and washing out although the maximum upflow velocity increased to 0.26 m/hr.
도시하수 2차 처리수의 총인 제거를 위한 직접여과공정의 적용
정종태 ( Jong Tai Jung ),조용현 ( Yong Hyun Cho ),한상윤 ( Sang Yun Han ) 한국수처리학회 2012 한국수처리학회지 Vol.20 No.6
This research investigated whether the combined process of direct filtration, coagulation/flocculation and up flow filtration with floating filter medium was an efficient treatment method for total phosphorus (T-P) removal from secondary effluent of municipal wastewater treatment plant. In coagulation/flocculation experiments, coagulants such as aluminum sulphate(Al₂(SO₄)₃), poly aluminum chloride (PACI), poly aluminum chloride silicate-2(PACS-2), ferric chloride(FeCl₃) were used to find out the optimum conditions for the removal of T-P, PO₄-P and turbidity by jar test. The optimum pH of coagulation was 6.0-6.5 and Al (Fe)/P mole ratio was 2.5-3.0. Although floc size of Al (lll) coagulants was bigger than FeCl₃, flocculation efficiency was not good enough, because of the low turbidity and very and very small particle size (under 10㎛). Also, in spite of increasing flocculation time from 10 to 30 min, growth of floc size was insufficient. As the result, 10 minutes of flocculation time was concluded the appropriate flocculation condition. 8.33m³/m² hr of the up flow filtration rate was found to removal over 8㎛ size particles effectively. The direct filtration showed the highest T-P removal efficiency of 91.9%.
천연광물질여재의 하이브리드 바이오필터를 이용한 하수 3차처리
정종태 ( Jong Tai Jung ),조용현 ( Yong Hyun Cho ),한상윤 ( Sang Yun Han ) 한국수처리학회 2014 한국수처리학회지 Vol.22 No.3
Wastewater treatment plants are required to meet the enhanced discharge standards. Various biofilter technology have been proposed treatment of secondary effluent. This research investigated the characteristics treatment by hybrid biofilter with natural mineral and floating media from secondary effluent of municipal wastewater treatment plant. Natural mineral media have a hydrophilic and porous honeycomb structure. This structure is suitable of the attachment and growth of structural advantages for the surface biofilm formation. In the hybrid biofilter experimental, substrate removal rate are COD 29.8%, T-N 21.5%, color 55.4%, respectively. Average particle size of effluent from hybrid biofilter was 13.1㎛ and showed 88.4% for 1~16㎛ of overall particles. Particle removal efficiency was stable more than 16㎛. Method of removal substrate are carried out mechanisms such as high activity of the biofilm in natural mineral media and denitrification of inner part of biofilm as well as ion adsorption capacity. As the result of PAC dosing, the hybrid biofilter showed the PO4-P removal to 0.15mg/L. Therefore, hybrid biofilter through a combination of natural mineral and floating media material can be applied to tertiary treatment process(phosphorus treatment and reuse).
정종태 ( Jong Tai Jung ),우달식 ( Dal Sik Woo ),조용현 ( Yong Hyun Cho ),한상윤 ( Sang Yun Han ),김희영 ( Hee Young Kim ),신성훈 ( Sung Hoon Sin ) 한국수처리학회 2013 한국수처리학회지 Vol.21 No.2
This work was aimed to study the chemical coagulation of phosphate from secondary effluent. Base on jar test experiments, also, the growth, breakage and regrowth of flocs formed by different coagulants, poly aluminium chloride(PACl), poly aluminum calcium chloride(PolyCa) and ferric chloride(FeCl3). The results showed the flocs generated in Mode 2(5.25~5.28NTU) were more resistant to shear and more recoverable than those did in Mode 1(0.24~0.27NTU). The floc size by coagulation depended on the particle size of the raw water. Although the floc strength factor was similar to each coagulants, floc formed in high turbidity condition were stronger. Specifically, PolyCa could get higher removal efficiency of phosphate than PACl and FeCl3. Moreover, the T-P removal efficiency was poor in low turbidity.
가정계 유해폐기물이 생활쓰레기 소각재의 중금속 농도에 미치는 영향
정종태 ( Jong-tai Jung ),안경수 ( Kyung-soo Ahn ),박수영 ( Soo-young Park ) 한국환경기술학회 2004 한국환경기술학회지 Vol.5 No.2
본 연구는 생활계 쓰레기 봉투 내에 혼입되어 배출되는 유해폐기물의 발생량을 파악하여 생활계 쓰레기가 소각될 때 소각재의 중금속 농도에 미치는 영향을 평가하고자 하였다. 생활쓰레기 봉투 내에 혼입되어 배출되는 유해폐기물의 양은 약 1.1% 정도로 나타났으며, 일반적으로 생활쓰레기의 분리수거체계가 가장 양호하게 운영되는 아파트 지역에서 유해폐기물의 혼입량이 가장 높았다. 또한 생활쓰레기 및 유해폐기물의 중금속 농도를 측정하여 생활쓰레기 소각재의 중금속 농도에 대한 유해폐기물의 기여율을 계산한 결과 As는 약 1,000배, Pb은 약 238배, Cu는 약 12배 정도로 매우 높음을 알 수 있었다. This study evaluated the influences on heavy metal concentration of the incineration ashes being generated in case of incinerating the MSW by analyzing the amount of the hazardous wastes discharged with mixed in the MSW envelope. As a result of this study, the amount of the hazardous wastes discharged with mixed in the MSW envelope was about 1.1%, and the influx amount of the hazardous wastes was the high-est in the apartment area generally of separate collection system`s being well managed. Furthermore as a result of calculating the contribution ratio of the hazardous wastes on the heavy metal concentration of the MSW incineration ashes by measuring the heavy metal conc-centration of MSW and hazardous wastes, the contribution ratio of the hazardous waste was higher 1,000 times in a case of As, 238 times in Pb and 12 times in Cu as compared with the MSW.