원격자동제어 MBR 하수고도처리 및 무방류 시스템 개발

1. 원격자동제어 MBR 하수고도처리 및 무방류 시스템 개발 연구책임자 : 안규홍/이용훈 참여연구원: 조진우, 서영우, Chackrit N. 2002/03/22

2. 금수강산21- 필요성 • 비점오염원 • 질소, 인 • 농약 등 환경 호르몬 • 표면 유출 및 지하수 침투 • 점오염원 • 질소, 인 및 유기물 • 산업폐수 • 환경호르몬류 • 골프장 • 농약(RUN OFF, 지하수) • 환경호르몬류 • 축산폐수 • 고농도 질소 및 유기물 • 항생제등 난분해성 물질 팔당호 수질 물부족 전망 2급수 COD 5급수 T-N 정수장 1급수 COD 2급수 T-N

3. 금수강산21- 연구개요 환경호르몬 관리기술 중수도 및 오염예방기술 점오염원 비점오염원 축산폐수 골프장 팔당호 정수장 일급음용수 생산기술 호소정화 및 관리기술

4. 금수강산21-과제 구성 안규홍/이용훈(최승일) 유영숙/정봉철 박대원/심상준 이석헌/신평균 재료 시스템 하이브리드 수처리 시스템 개발 환경호르몬 조기검출 및 저감기술 개발 미래 기술 환경 공정 생체 과학 환경신소재 이용 오염예방 및 요소기술 개발 금 수 강 산 21 송휴섭/안규홍 상수원 오염 자동감시 온라인 센서 및 시스템 개발

5. 금수강산21- 연구체계 학계 - 서울대, 고려대, 연세대, KAIST, KJIST 등 총 27개 대학 연구소 • 건설기술연구원 • 환경정책평가원 해외 • 미국 일리노이주립대 • 미국 델라웨어주립대 • 독일 KIST-유럽연구소 • 테국 AIT 대학 국공립기관 • 국립환경연구원 • 한강수질검사소 • 한국수자원공사 기업 • 대기업 • 벤처형 중소기업 금수강산 21 연구사업단 (KIST) 자문단 Pool • 미래기술연구본부 • 환경공정연구부 • 재료연구부 • 시스템연구부 • 생체과학연구부 • 청화대 비서실 • 국무총리실 • 수질개선기획단 • 환경부 • 건설교통부 • 경기도 등 지차체

6. 금수강산21-환경신소재 이용 오염예방 및 요소기술 개발 정범석 안규홍/이용훈 김구대/최승일 환경신소재 이용 오염예방 및 요소기술 개발 고분자 분리막 소재 및 표면개질기술 개발 원격자동제어 MBR 하수고도처리 및 무방류 시스템 개발 수처리용 분해분리 소재 기술 개발 미래 시스템 재료

7. CONTENTS Backgrounds Research Objectives and Scopes Materials and Methods Results & Discussions

8. General Backgrounds Membrane Submerged-type Membrane BioReactor • Why MBR? Settling Bioreactor + = Sludge Returning

9. General Backgrounds Recircultion pump Influent Effluent Effluent P P Suction pump Influent Bioreactor Bioreactor (submerged membrane) (side-stream membrane)

10. General Backgrounds Fouling • What is the main problem? Additional Operating Cost • Backwashing • Chemical washing • Energy consumption • Replacement  Prediction of Membrane fouling is very important

11. General Backgrounds • Current issue : The role of SMP on membrane fouling Fouling control • Membrane type • Module type • Operating strategy • Cleaning strategy Fouling factors • SRT • HRT • MLSS • Wastewater Quality SMP Water Quality • Organics • Nutrients • Biomass conc. • Operating strategy SMP relationship with fouling control & water quality

12. Research Objectives and Scopes • Development of SMBR system for wastewater treatment Advanced wastewater treatment using membrane • Zero-Discharging system • Particulate free effluent • Less Sludge Production • Optimal MBR operation • Flux for stable MBR operation • Physical & chemical cleaning methods for fouling control Remote control & monitoring • Construct MMI system • Provide MMI protocol versatile to other systems • Remote access via internet • Real time maintenance and data collection

13. Research Objectives and Scopes • Modifying ASM introducing EPS as soluble matters • Applying membrane fouling model • TSS and EPS as major membrane foulants • Introducing Specific resistance for considering EPS effects • Sensitivity analysis • Water quality : Kinetic parameters related with EPS • Membrane fouling : Specific resistance • Establish mathematical model describing water quality and membrane fouling • Determine kinetic parameters by independent batch test • Model evaluation & Simulations • Compare simulation results with experimental data from bench scale MBR

14. Materials and Methods FM SP PM1,2,3 Temp FP BP DO Level Effluent Membrane Module AB Wastewater Air Lift AFM Feed Tank Effluent Tank • Bench-scale SMBR system Membrane Polyethylene with hydrophilic coating, 0.4㎛ hollow-fiber (MF, Mitsubishi Rayon, Japan) Effective filtration area of 0.2m2/module Influent Municipal wastewater Aeration 10L/min/module Suction 8 min. Resting 2 min. Backwashing 30 sec. Comparing data from bench scale MBR with simulation result

15. Materials and Methods Control Center (KIST) Operator Internet WAP Mobile phone Real-time control Real-time monitoring Local System (Kwangjoo) MBR Reactor • Remote monitoring and control Remote Control Central Control Center Monitoring/ Alert Signal (GUI system) Data acquisition Local Control Center Operation/ System control • Monitoring Factors : Pressure, Flow-rate, DO, Temp, Level • Control Factors : Flow-rate, Operation time/interval, Aeration

16. Materials and Methods • Overall Modeling Structure Influent Modified ASM introducing SMP • Membrane fouling model • Mass transfer onto Membrane SSMP, XTSS ∆Resistance ∆Transmembrane pressure Effluent

17. Materials and Methods • Membrane fouling : Resistance in series Model m Accumulated mass on membrane surface Permeate Km Coefficient of crossflow effects (Shear force effects) Membrane(Rm) Shear stress (Air bubbling effect)

18. Materials and Methods Data collection Pressure gauge Solution reservoir 10.5 Permeate Flow meter Membrane Nitrogen gas Magnetic stirrer • Measuring Specific Resistance Investigate the effects of TSS with EPS on membrane fouling Conditions : TSS=3,000;5,000;8,000;10,000;15,000 (mg MLSS/L) SMP=1;2;5;10;20 (relative concentration) αBiomass with SMP = fn (Conc. of Biomass & SMP)

19. Materials and Methods • Extraction and Measurement of EPS Washing with Saline and re-suspending by D.I water Sampling & Centrifuging Centrifuging Discard Resin TOC analysis & Collect for batch test Ca2+ Extracelluar ploymers PO4n- Ca2+ Hydrophobic zone COO- Ca2+ Ca2+ Oligomer and small organics OH- Ca2+ Bacteria N+

20. Results and Discussions Flow meter Pressure gauge P Permeate Suction pump Dtop Dmh Db Blower DW Dm DW Dm Design & operating parameters for a bench-scale SMBR system - Effects of design parameters on hydrodynamic conditions - Effects of operating parameters on fouling and critical flux

21. Results and Discussions SMBR System installed in Kwangjoo WWTP Bench-scale MBR system Green Korea 21 SMBR Plant Site

22. Results and Discussions 15000 15LMH 15LMH 12000 Sludge Wasting 9000 System Acclimation Initial MLSS 3,000mg/L Total Suspended Solids (mg MLSS/L) 10LMH 6000 Operation halt two times for system repair 3000 0 0 20 40 60 80 100 Operating Days • Total Suspended Solids accumulation MLSS 11,000±1,000mg/L • No Sludge wasting for 80 days • Sludge production rate for 80 days = 0.1gMLSS/day

23. Results and Discussions • Flux variation due to membrane fouling MLSS 11,000±1,000mg/L Operation halt two times for system repair System Acclimation Initial MLSS 3,000mg/L 10LMH No Feeding 15LMH 15LMH Flux (Js/Jo) Outstream chemical washing Operating Days

24. Results and Discussions • Effluent Quality Under Extended Aeration TSS variations TCOD variations influent influent mgCODcr/L TSS (mg MLSS/L) effluent Time elapsed(day) Time elapsed(day) No TSS in effluent (100% removal) More than 90% removal of TCOD

25. Results and Discussions • Model simulations for various conditions Control factors :SRT, HRT, F/M Ratio Monitoring factors :effluent quality and membrane flux variation • The usage of simulation results • Predict effluent quality in given conditions • Determine optimal membrane regeneration time • Determine SRT and HRT for minimizing membrane fouling

26. Results and Discussions • Effects of SRT on flux decline • The rate of flux decline tends to increase with SRT

27. Results and Discussions • Effects of SRT on cleaning cycle • Cleaning cycle interval decrease with increasing SRT up to 20 days

28. Results and Discussions • Effects of SRT on TSS accumulation rate • The amount of TSS accumulation reaches a steady state value

29. Results and Discussions • Effects of SRT and F/M ratio on SMP F/M < 1.2 F/M > 1.2 • Region I : The relative SMP conc. decreases with increasing SRT • Region II : The relative SMP conc. seems to be independent of SRT

30. Results and Discussions • Composition of effluent COD The refractory matters such as SMP and inert soluble substances are critical factors affecting the effluent quality

31. Thanks for your attention !