Transcript Who Is Caliber…

Decentralized Wastewater
Workshop
Greenville, South Carolina
July 30, 2009
Land Disposal of Treated Wastewater
Treatment & Disposal Options Overview
Primary Treatment
/ Solids Separation
Conventional
Drain Field
Disposal
Secondary
Treatment
LPP Disposal
Sand Mound
Disposal
Tertiary
Treatment
Drip
Irrigation
Disposal
Spray
Irrigation
Disposal
Sand Line
Trench
Disposal
Re-Use
(Purple Pipe)
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Secondary Treatment
Treatment Method Options
Attached Growth
• Orenco Recirculating PackedBed Media Filters
• Aqueonics Multi-Stage
Trickling Filters
• Aquapoint Bioclere/Lotus
Modified Trickling Filters
• Puraflo Peat Fiber Biofilters
• Recirculating Sand Filters
Suspended Growth
• Extended-Air Activated
Sludge Plants
• ATU’s (aerobic treatment
units)
• SBR’s (sequencing batch
reactors)
• MBBR’s (moving bed
biological reactors)
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Tertiary Treatment
Treatment Method Options
Effluent Polishing
• Disc Filters
• MBR’s (membrane biological
reactors)
• Constructed Wetlands
• Disinfection
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Secondary Treatment Options
Orenco AdVantex Recirculating Packed-Bed Media Filter
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Secondary Treatment Options
Aqueonics Multi-Stage Trickling Filter
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Secondary Treatment Options
Aquapoint Bioclere Modified Trickling Filter
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Secondary Treatment Options
Puraflo Peat Fiber Biofilter
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Secondary Treatment Options
Recirculating Sand Filter (RSF)
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Secondary Treatment Options
Extended-Air Activated Sludge Plant
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Secondary Treatment Options
Clearstream ATU
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Secondary Treatment Options
SBR
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Secondary Treatment Options
Puraflo PuraMax MBBR
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How to Select the Right System
Decision Process Overview
Feasibility
of Options
Site
Suitability
System
Selection
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Define Wastewater Flow Rate and Characteristics
Identify Potential On-Site & Off-Site Options
Conduct Preliminary Site Reconnaissance
Perform Feasibility & Cost Evaluation of Options
Identify System Ownership and O&M Provider
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Conduct Pre-Design Conference with DHEC
Conduct Detailed Site Investigation
Identify & Quantify Suitable Disposal Area(s)
Determine Long-Term Acceptance/Loading Rate (LTAR)
Obtain DHEC Concurrence with Findings
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Determine Feasible Disposal Method(s)
Determine Required Treatment Method(s)
Perform Cost Evaluation & Select System
Submit Preliminary Engineering Report for DHEC Approval
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Individual Lot
Conventional Drain Field
System Summary
 Std. Septic Tank & Stone Drain Tile Field
 Drain field requires cleared land w/ < 10% slope.
 3,000 sq ft active drain field + 50% repair area
 Approx. Unit Cost = $4,000 - $5,000 per lot.
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Individual Lot Drip Irrigation
System Schematic
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Individual Lot Drip Irrigation
System Summary
 Std. Septic Tank + Secondary & Tertiary Treatment.
 Subsurface drip field requires un-cleared land w/ <
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33% slope.
2,000 sq ft drip field + no repair area.
Approx. Unit Cost = $25,000 - $28,000 per lot.
Requires 110-volt power supply + telephone line.
Requires routine maintenance @ approx. $600/yr.
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Individual Lot Drip Irrigation
System Cost
(City of Austin, TX)
Estimated drip irrigation system costs, installed,
including controls and alarm, (not including pretreatment
unit(s)),
$15,000
Energy costs (using 0.193 KWH/day energy use),
$0.47/month
O&M, with a maintenance contract of $540/year (est. 18
hrs. @ $15/hour * 2.0, including taxes, overhead, and
profit),
$45/month
Equipment repair/replacement costs, estimated at
$50/year,
$4.17/month
20-year NPW (not including design & permitting costs),
$20,934.68
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Individual Lot Repair Solution
Camden County, NC
AdVantex Pre-Treatment & Sand Mound Disposal over Sand Line Trench
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Communal Drain Field
System Overview
 100-Lot Subdivision, Avg. 3-BR, in Upstate
 Primary Treatment
 0.4 GPD/Sq Ft LTAR
 Requires 6.9 acres of Active Drain Field plus
additional 3.4 acres for 50% Repair Area
 HOA Ownership (excluding Collection System)
 Permitting by DHEC-Bureau of Environmental
Health (up to 50,000 GPD +/-)
 Approx. Unit Cost = $5,000 - $6,000 per lot
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Communal Drain Field
Cottageville Elem School
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Communal Drip Irrigation
System Overview
 100-Lot Subdivision, Avg. 3-BR, in Upstate
 Primary & AdVantex Secondary Treatment
 0.2 GPD/Sq Ft LTAR
 Requires 4.1 acres of Subsurface Drip Field & No
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Repair Area
Requires Routine O&M
Requires Utility Ownership
Permitting by DHEC-Bureau of Water
Approx. Unit Cost = $18,000 - $20,000 per lot
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Ralph Chandler Middle School
Surface-Drip Irrigation System
Decision Process
• Off-site Option (Public
Sewer) = $2.0 million.
• Potential for On-site
Conventional Septic System.
• NPDES River Discharge Not
Desireable.
Feasibility of
Options
Site
Suitability
• School site full of program
elements.
• Not enough suitable area for
conventional septic.
• Off-site septic option not
feasible.
• Shallow rock & steep slopes.
• Visited Operating Drip
Systems in NC with DHEC.
• Selected surface drip
irrigation of wooded,
unbuildable area of site.
• PER Approved by DHEC.
System
Selection
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School Surface-Drip Irrigation
System Overview
 New Ralph Chandler Middle School at Fork Shoals
- Orenco Recirculating Media Filter Treatment
- 6-Acre GeoFlow Surface-Drip Irrigation Disposal
- 0.1 – 0.2 GPD/Sq Ft LTAR
- 250,000 Gal (2 weeks) Treated Effluent Storage
- 15,900 GPD Design Flow
- 4 Groundwater Monitoring Wells
- $1.6 Million Construction Cost
- Contract Operator – All Seasons Environmental Laboratories
- Orenco Vendor Oversight Operations Contract - AQWA
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School Surface-Drip Irrigation
EQ Tank, Recirc Pumps, & Treated Effluent Storage
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School Surface-Drip Irrigation
AdVantex Treatment Pods
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School Surface-Drip Irrigation
Irrigation Pumps & Disc Filter
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School Surface-Drip Irrigation
Surface-Drip Irrigation Field
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Wrap-Up ….
What Makes a Decentralized
System Successful?
 Suitability of Site & Sustainable Loading Rate.
 Proper Application of Treatment & Disposal
Methods Selected.
 Good Design.
 Good Installation.
 Good O&M.
Thanks for your attention ….
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