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APPROPRIATE SELECTION AND OPTIMIZATION OF BIOLOGICAL WASTEWATER TREATMENT PROCESSES
FUJIE,Koichi 嶺南大學校 環境問題硏究所 1994 環境硏究 Vol.14 No.1
Characteristics of aerobic biological wastewater treatment processes, such as activated sludge process, trickling filter process, rotating biological contactor, land application and so on, was studied from view points of the power economy, which is defined as the amount of BOD removed per unit power consumption, and the rate of BOD removal per unit floor area of each process. Effects of the operating conditions and the configurations of the process on their performance were clarified for the appropriate selections and their operating conditions to give a high power economy and to maintain a high quality effluent as well.
ZERO-EMISSION MATERIALS CYCLE IN PRODUCTION PROCESS AND REGIONAL SCALE
FUJIE, Koichi The Korean Society of Clean Technology 1997 청정기술 Vol.3 No.2
The present paper aims to give basic information to establish zero emission material cycle including the minimization of emissions from industrial production processes and the area in regional scale. Strategies and methodologies to analyze emissions from the production processes and our human activities and to reduce those emissions by refining and/or replacing the unit process with the alternatives are introduced as well. Quantitative evaluation and management systems of any raw materials and the production process are from vie points of treatment are essential. Estabiishment of a process networking for the recycle of discharged non-products materials by the intra-process, trans-process and the trans-industries are proposed. Procedures and priorities to formulate industrial and regional zero emission system are proposed as well.
Fujie,Koichi,Okada,Mitumasa,Kawashima,Hiroyuki,Okazaki,Minoru 嶺南大學校 環境問題硏究所 1995 環境硏究 Vol.15 No.1
A hollow fiber microfiltration (HMF) membrane featured an unique air-backwashing and a high filtrate flux under a low pressure and a low cross flow rate was successfully incorporated with the aerobic submerged biofilters for the advanced treatment of domestic wastewater. HMF system A in which the wastewater filtrated directly by the HMF membrane was treated by the aerobic submerged biofilter and HMF system B in which the moving bed aerobic biofilter (MBF) was followed by the HMF were proposed and were investigated in terms of the filtrate fluxe, the organic removal, the power consumption and the running cost based on the experimental results. The running cost was comparable with the conventional activated sludge process, whereas the effluent quality was superior than that.
Zero Emission Production for Conservation of Water Environment
FUJIE, Koichi 嶺南大學校 環境問題硏究所 1999 環境硏究 Vol.18 No.2
AbstractsThis paper aims to give basic information for the minimization of pollution load to environment by reducing wastewater discharge from production process and by selecting appropriate wastewater treatment processes based on characteristic evaluation of both treatment processes and that of wastewaters. Strategies and methodologies to analyze emissions from the production processes to reduce those by refining and/or replacing the unit process with the alternatives are introduced as well. It was stressed that taking materials and energy balances of the production process are the essential to clarify emissions quantitatively for the reduction of pollutants in the focused process. A procedure including biological degradability, activated carbon adsorption, chemical oxidation for mineralization and for improvement of biodegradability of pollutants, coagulation, and so on, was proposed to evaluate wastewaters for appropriate selection of treatment processes.
Feasibility of Recycling Residual Solid from Hydrothermal Treatment of Excess Sludge
Kyoung Rean Kim,Koichi Fujie,Toshiharu Fujisawa 대한환경공학회 2008 Environmental Engineering Research Vol.13 No.3
Residual solid in excess sludge treated by hydrothermal reaction was investigated as raw material for its recycling. Treated excess sludge and residual solid were also focused on their content change during hydrothermal reaction. Two kinds of excess sludge, obtained from a local food factory and a municipal wastewater treatment process, were tested under various conditions. Following hydrothermal reaction, depending on the reaction conditions, biodegradable substrates in treated excess sludge appeared to increase. The separated residual solid was a composite composed of organic and inorganic materials. The proportion of carbon varied from 34.0 to 41.6% depending on reaction conditions. Although 1.89% of hazardous materials were detected, SiO₂ (Quartz) was a predominant constituent of the residual solid. X-ray diffraction (XRD) experiments revealed that the residual solid was of a partially amorphous state, suggesting that the residual solids could be easily converted to stable and non harmful substances through a stabilization process. Thus, this technology could be successfully sed to control excess sludge and its reuse.