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8/2/2019 2012PRF D1S2 Getting Rivers Clean Innovative by Ditmar Gorges
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Getting Rivers Clean:Innovative Wastewater
Management
Ditmar Gorges, President Entech
8/2/2019 2012PRF D1S2 Getting Rivers Clean Innovative by Ditmar Gorges
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Analogy Of Pasig River’s Present
Situation: Open Fracture Wound
Wound Dressing – Removal of floating
debris
Painkiller administration – Pouring in enzymes or
bacteria
Brace installation – Mechanical
treatment: Gravity
Filters or Aerotors
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Case Study: Columbus GA
Preliminaries:
1. Volume: 38 Million Liters of Urban Creek
Water2. To satisfy TSS, BOD and Bacteria limit
requirements
3. A secondary goal was to improve anaquatic biology impairment.
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Columbus GA10 MGD WWETCO FilterUrban Creek Water
Treatment
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Columbus GA10 MGD WWETCO FilterUrban Creek Water
Treatment
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0
100
200
300
400
500
600
1 11 21 31 41 51 61 71 81 91
T S S , m
g / l
Filter Run Composite Tests
TSSPrimary Influent Filtration - March to September 2011
Average Filter Effluent 13 mg/l
Influ
Efflu
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020
40
60
80
100
120
140
160
180
200
1 11 21 31 41 51 61 71 81
C B O D 5 , m g / l
Filter Run Composite Tests
CBOD5
Primary Influent Filtration - March to September 2011
Average Filter Effluent 25 mg/l
Influ
Efflu
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Columbus GA Performance Summary
•97-99% Reduction in TSS
•69-96% Reduction in BOD
•Up to 80% Reduction in Fecal Coliform
•Significant Reduction in Trash and Debris•Meets bacteria biological pollutant
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• Atlanta, GA Combined Storm Overflow• Akron, OH Combined Storm Overflow and Tertiary Filtration• Johnson County, KS Primary Influent and Effluent for Sewer an
Storm Overflow(same as Pasig water quality)
• St Joseph, MO Combined Storm Overflow• Columbus, GA Tertiary Filtration, High MLSS Overflow andChemical Floc Removal for Phosphorous Reduction
• Milwaukee, WI Combined Storm Overflow with PhosphorousRemoval
• State of New Jersey for Combined Storm Overflow TreatmentStandard to Protect Beaches and Recreational Waterways; EPAORD Participation
Other Water Bodies Rehabilitation
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Considerations:
1. Energy Requirements
2. Space Requirements3. Investment Requirements
Application to Pasig River Rehabilitation
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US WWT COST (2007)
San Francisco and Seattle$2.65/m3
Sacramento and Miami
$0.80/m3
Chicago and Las Vegas
$0.25/m3 (about the same asChina)
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Seattle ($0.06/kWh)
San Francisco ($0.08/kWh)
Ho Chi Minh City ($0.08 /kWh)
Beijing ($0.10/kWh)Manila ($0.27/kWh)
Energy Rates
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ENERGY CONSUMPTION OF
DIFFERENT TECHNOLOGIES
0.08
0.36
0.888
0.912
0.946
1.032
0 0.2 0.4 0.6 0.8 1 1.2
Gravity Filters
Aerotors
SBR
Oxidation Ditch
MBBR
MBR
kWh per cu.m Wastewater (BOD and TSS Removal Only)
Gravity Filters
Aerotors
SBR
Oxidation Ditch
MBBR
MBR
kWh per m3
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Technology Selection
Aerotors• Low energy
• Small footprint
• No odor• Low sludge
production
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Technology Selection
Gravity Filters• Extremely low
energy use and
limited OM• Small footprint for
large flow treatment
• Minimal investment
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Gravity Filters Available In The Market• Multi Function Uses
– Raw Sewage Filtration (85% TSS) – Biological Treatment (68% BOD5) – Chemical Floc Filtration (TP < 0.1)
• Low Backwash Water(1% to 10%)
• Low Power Requirements(0.003 to 0.024 KWHr/m3 treated)
• Low Capital Costs(< PHP 3,000.00/cubic meter).
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THANK YOU
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