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
ECOPAT(Ecodays Plug - Flow Aerobic Tank)
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