ECOPAT(Ecodays Plug - Flow Aerobic Tank)

ECOPAT (ECOdays' Plug-flow Aerobic Tank)       1.1 ECOPAT Characteristics1.1 ECOPAT  vs CSTR (Conventional AT)   ECOPAT CSTR Technology Diagram Type of Flow Modified PFR (Vertical CSTR-series) CSTR Type of aeration Normal aeration Micro aeration HRT 0.5~4 7~20 F/M Ratio 0.5~1.5 kgBOD/kgMLVSS?d 0.08~0.5 kgBOD/kgMLVSS?d MLSS 8,000~25,000 mg/L 5,000~8,000 mg/L BOD Loading Rate 8.35~16 kgBOD/??d 0.5~3.6 kgBOD/??d BOD removal per kWh 1.1 kgBOD/kWh 0.6 kgBOD/kWh Feature - high oxygen transfer rate (~26%) due to the gas hold up space- Improvement of removal efficiency compared to current facility - Demand a lot of HRT for the treatment- Demand a lot of space- High cost for using chemicals1.3 Fluid flow characteristics - High Oxygen transfer by the retention time- High removal efficiency by PFR- High MLSS by long SRT- No dead space  1.4 Economical factors1.4.1 Construction cost   ECOPAT CSTR Process Pretreatment-BT-Dewatering(DW) Pretreatment-DW-BT-DW Civil 51% 100% Equipment 123% 100%  Total 110% 100%   1.4.2 Operation cost   ECOPAT  CSTR  Electric  49%  100%  Chemicals  50%  100%  Total  49%  100%   1.5 References Type of influent number  Digestate 5 Food wastewater 7 Town wastewater 1 Resource facility 1 Livestock manure 11 Total 25  As of 2012        Ulsan SBK Digestate treatment (600?/day)   Optional Information- Payment : L/C- Origin : Republic of Korea- Samples : Not Avaliable