SFC-Biofilter에 의한 하수 재이용을 위한 중수도 시스템의 구성

강용태 ( Yong Tae Kang ),김화석 ( Hwa Suk Kim ) 한국수처리학회 2003 한국수처리학회지 Vol.11 No.2

N/A This study was performed to composite an optimal water reuse system through comparison between the SFC system combining a Biofilter and Biofilter+RO process and 2nd treatment process+Sand filter combining a GAC or BAC and RO process. The turbidity, BOD, color, and COD of effluent in the SFC system which depends on the stabilization and flocculator, clarifier and biofilter show 0.9-1.6 NTU, 7.5㎎/L, 11.3-15.8 unit, and 12.3㎎/L respectively. This process can possibly be considered as a water reuse system. The SFC-Biofilter system is regulated the standard of reuse water quality. SFC-Biofilter combining RO process has been investigated a new method of the water reuse system for improved water quality in other to achive C1^(-) ion removal effectively. Turbidity, BOD, Color, and COD of effluent in SFC-Biofilter + RO system generally shows 0.30-0.52 NTU, 0.4-1.9㎎/L, 0.2-0.38unit 0.34-0.57㎎/L respectively, and also the standards of reuse water quality have been applied to the water qualiEing system for the dyeing industry, as Cl-ion concentration is regulated the range of 7.52-9.21 ㎎/L. To estimate economic advantages of the SFC-Biofilter, it have been studied for the comparison of secondary treatment system combining the Sand filter, GAC or BAC process, to the water reuse system, using the total HRT. The HRT of the Stabilization basin, Flocculator. Clafier and Biofilter in the SFC-Biofilter system have been observed as 1.0, 0.67, 1.7, and 0.33hr respectively. The total HRT was observed 3.7 hr. But as HRT of Biofilter. Clafier, Sand filter and GAC in secondary treatment system combining with the Sand filter, GAC, and BAC process was observed 7.0, 3.0, 0.2, and 0.25hr respectively, total HRT is this system was 10.45hr. The SFC-Biofilter reuse system is resulted in more economic process than the secondary treatment system combining with Sand filter, GAC or BAC, since the HRT is shorter.

하수 재이용을 위한 처리시스템의 구성 및 처리특성

강용태(Yong-Tae Kang),김화석(Hwa-Suk Kim),조용현(Yong-Hyun Cho) 동아대학교 해양자원연구소 2002 동아대학교 해양자원연구소 연구논문집 Vol.14 No.-

Experimental study of Pilot-plant scale has been performed with ASA system connected with Sand filter, GAC, and RO as wastewater reusing system. As the results of the batch test performance of ASA + Sand filter + GAC connecting with RO, Cl?, COD, NH₄-N and PO4-P were over 99% in all cases of 20 bar, 30 bar and 40 bar. Especially, Cl? level was shown with excellent removal rate of over 99%. It was sure that all the items had over 90% removal. 20 bar selected in RO batch test was adopted to continuous test. The results have it that Cl?, COD, NH₄-N, PO₄-P and Ca²? except for turbidity were over 91%. Through the assessment of wastewater reuse, only the treatment by ASA + Sand filter or ASA + Sand filter + GAC system is applicable to toilet flushing or cleaning. Particularly, it is considered that ASA + Sand filter plus RO system is very effective as dyeing industy water which need high water quality.

ASA 시스템의 기질제거에 관한 동역학적 해석

한동우(Dong Woo Han),강용태(Yong Tae Kang),김화석(Hwa Suk Kim) 한국수처리학회 2001 한국수처리학회지 Vol.9 No.4

N/A This study was focussed on the theoretical analysis of substrate removal using the novel BNR system, Advanced Step Aeration(ASA) system which could cope with not only a low level of municipal wastewater but also a high strength of apartment wastewater. Kinetic coefficients derived from bench-scale experiments for mass balance analysis on substrate could he estimated as follows ; the maximum substrate utilization rate k, the saturation constant K_s, the endogenous decay coefficient K_d, the yield coefficient Y and the specific growth rate l^1_(max) was revealed to 2.2 d^(-1), 92 ㎎/L, 0.054 d^(-1), 0.46 ㎎VSS/㎎ BOD_5, and 1.01d^(-1), respectively. Using kinetic coefficients of ASA system, the net yield parameter Y_n could be shown as 0.44 and also theoretical RAS ratio could be described. Substrate removal coefficients, ψ₁, ψ₂, ψ₃ and ψ₄ in anaerobic, aerobic, anoxic, reaerobie tank, respectively, was obtained and equations on effluent substrate levels in each tardy could be derived. On the basis of kinetic coefficients theoretical RAS ratio was 0.28. It was verified that correlation between theoretical values and experimental values in substrate removal of each tank be very close.

ASA시스템을 이용한 합병정화조의 개선 및 경제성 평가에 대한 연구

강용태,김화석 東亞大學校 建設技術硏究所 2001 硏究論文集 Vol.25 No.2

Most of existing combined septic tanks of household wastewater and night soil have been treating medium or small scale domestic wastewater by means of activated sludge process. But this process is mainly organics-removed process such as BOD and SS. So nitrogen and phosphorus which is the main issues of eutrophication are not properly treated in this process. Therefore, in order to treat nitrogen and phosphorus stably, in this study, retrofical combined septic tank including sludge stabilization basin is applied to a small domestic wastewater treatment facility and treatment efficiencies of organic matter and nutrients and economics in this process are investigated. As a initial operation results of Activated Sludge(AS) process and Advanced Step Aeration(ASA) process applied as combined septic tank, SS and COD removals in ASA process compared to AS reached the steady state in a short term. T-N and T-P removals in ASA process is from fifteen to twenty percent higher than those of AS process. Results investigating the economics of ASA process have it that in case of comercializing ASA process as a small treatment plant(such as FRP tank) it is described that ASA process is to be saved to the degree of from ten to fifty percent in compared with other methods.

하수 재이용을 위한 처리시스템의 구성 및 처리특성

강용태,김화석,조용현 東亞大學校 海洋資源硏究所 2002 硏究論文集 Vol.14 No.1

Experimental study of Pilot-plant scale has been performed with ASA system connected with Sand filter, GAC, and RO as wastewater reusing system. As the results of the batch test performance of ASA + Sand filter +GAC connecting with RO, CI^-, COD NH_4-N and PO4-P were over 99% in all cases of 20 bar, 30 bar and 40 bar. Especially, CI^- level was shown with excellent removal rate of over 99%. It was sure that all the items had over 90% removal. 20 bar selected in RO batch test was adopted to continuous test. The results have it that CI^-, COD, NH_4-N, PO4-P and Ca^2+ except for turbidity were over 91%. Through the assessment of wastewater reuse, only the treatment by ASA + sand filter or ASA + Sand filter + GAC system is applicable to toilet flushing or cleaning. Particularly, it is considered that ASA + Sand filter plus RO system is very effective as dyeing industy water which need high water quality. key words : Advanced Step Aeration (ASA) system, Wastewater Reuse, Sand Filter, GAC, RO system.

생물막여과공정에 의한 고도정수처리시스템 구성에 관한 연구

강용태,양희천,김화석,김경동 동아대학교 환경문제연구소 1999 硏究報告 Vol.22 No.2

This study is to evaluate the characteristics of submerged biofilter process as pretreatment of raw water and alternative advanced water treatment system(AAWTS) composed with bioflitration, post-ozonation and GAC for Nakdong River by comparison of existing advanced water treatment system(EAWS), composed with pre-ozonation, flocculation, sedimentation, sand filtration, post-ozonation and GAC. In the biofiltration process, the removal of turbidity, color, KMnO₄consumption, NH₃-N and UV254 reached 98%, 95%, 70%, 72%, 79% respectively. The stable removal efficiency was obtained by the direct biofiltration after coagulant injection thought the influent was a muddy and highly polluted. The removal efficiency of the alternative advanced water treatment(AAWTS) using biofiltration process for turbidity, color, KMnO₄consumption, NH₃-N and UV254 was reached 98.5%, 98%, 82%, 90%, 92% respectively. It is equivalent to the removal efficiency of existing advanced water treatment system(EAWTS) though the demanded area and coagulant of the alternative advanced water treatment system using biofiltration process was decreased about 60% and 70% respectively.

가정오수를 처리하는 ASA 공법의 생물학적 영양소 제거성능 평가

김태기,강용태,한동우,김화석 한국수처리기술연구회 2000 한국수처리학회지 Vol.8 No.2

Biological Nutrient Removal Capacity was evaluated in a full-scale study at an apartment wastewater treatment plant to introduce low cost operational and high efficient system and protect water sources from eutrofication caused by nitrogen and phosphorus. The novel BNR system, Advanced Step Aeration(ASA) system consisting of anoxic sludge tank, anaerobic, aerobic, anoxic, and aerobic tank in series with step feed was used for the study. Nutrient removals through ASA system were considerably excelent: at influent levels of T-N 40∼80㎎/ℓ, T-P 4.0∼8.0㎎/ℓ, respectively, removal efficiencies for T-N and T-P are 70∼85% and 90% and effluent levels for T-N and T-P are 10∼15㎎/ℓ and 0.4∼0.6㎎/ℓ. Step-feeding raw wastewater to anaerobic, and anoxic tank and using raw wastewater as external carbon source have brought about the improvement of denitrification capacity. Maximized phosphorus release was derived from reduction of Nitrite and Nitrate loading through additional denitrification and successful DO control, Nitrification rate(K_N) according to water temperature in aerobic tank was rather high from 0.89 to 1.27 ㎎N/gMLSS·hr in the range of 13∼18℃. Denitrifcation rate(K_(DN)) was revealed to be from 0.64 to 0.95 ㎎N/gMLSS·hr in C/N ratio of 3.6∼4.3 over 15℃ and from 0.5 to 0.77 ㎎N/gMLSS·hr in C/N ratio of 3.5∼4.0 below 15℃. In C/P ratio of 35∼58 phosphorus release rate(K_(PR)) in the anaerobic tank and phosphorus uptake rate(K_(PU)) in the anaerobic tank could be described as 3.1∼4.1㎎P/gMLSS·hr, 1.9∼2.5㎎P/gMLSS·hr, respectively.