Decentralized Wastewater Workshop

Greenville, South Carolina

July 30, 2009

Land Disposal of Treated WastewaterTreatment & Disposal Options Overview

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Secondary TreatmentTreatment Method Options

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Tertiary TreatmentTreatment Method Options

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Secondary Treatment OptionsOrenco AdVantex Recirculating Packed-Bed Media Filter

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Secondary Treatment OptionsAqueonics Multi-Stage Trickling Filter

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Secondary Treatment OptionsAquapoint Bioclere Modified Trickling Filter

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Secondary Treatment OptionsPuraflo Peat Fiber Biofilter

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Secondary Treatment OptionsRecirculating Sand Filter (RSF)

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Secondary Treatment OptionsExtended-Air Activated Sludge Plant

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Secondary Treatment OptionsClearstream ATU

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Secondary Treatment OptionsSBR

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Secondary Treatment OptionsPuraflo PuraMax MBBR

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How to Select the Right SystemDecision Process Overview

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Individual Lot Conventional Drain FieldSystem Summary

Std. Septic Tank & Stone Drain Tile FieldDrain field requires cleared land w/ <

10% slope.3,000 sq ft active drain field + 50%

repair areaApprox. Unit Cost = $4,000 - $5,000 per

lot.

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Individual Lot Drip IrrigationSystem Schematic

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Individual Lot Drip IrrigationSystem Summary

Std. Septic Tank + Secondary & Tertiary Treatment.

Subsurface drip field requires un-cleared land w/ < 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 IrrigationSystem Cost(City of Austin, TX)

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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

Individual Lot Repair SolutionCamden County, NCAdVantex Pre-Treatment & Sand Mound Disposal over Sand Line Trench

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Communal Drain FieldSystem Overview100-Lot Subdivision, Avg. 3-BR, in UpstatePrimary Treatment0.4 GPD/Sq Ft LTARRequires 6.9 acres of Active Drain Field plus

additional 3.4 acres for 50% Repair AreaHOA 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 FieldCottageville Elem School

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Communal Drip IrrigationSystem Overview

100-Lot Subdivision, Avg. 3-BR, in UpstatePrimary & AdVantex Secondary Treatment0.2 GPD/Sq Ft LTARRequires 4.1 acres of Subsurface Drip Field &

No Repair AreaRequires Routine O&MRequires Utility OwnershipPermitting by DHEC-Bureau of WaterApprox. Unit Cost = $18,000 - $20,000 per lot

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Ralph Chandler Middle SchoolSurface-Drip Irrigation SystemDecision Process

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School Surface-Drip IrrigationSystem 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 IrrigationEQ Tank, Recirc Pumps, & Treated Effluent Storage

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School Surface-Drip IrrigationAdVantex Treatment Pods

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School Surface-Drip IrrigationIrrigation Pumps & Disc Filter

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School Surface-Drip IrrigationSurface-Drip Irrigation Field

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Wrap-Up ….

What Makes a DecentralizedSystem 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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