Docstoc

Subdivision Lot Contract

Document Sample
Subdivision Lot Contract Powered By Docstoc
					Decentralized Wastewater
       Workshop
      Greenville, South Carolina




         July 30, 2009
Land Disposal of Treated Wastewater
Treatment & Disposal Options Overview


    Primary Treatment            Conventional       Sand Line
                                  Drain Field        Trench
    / Solids Separation            Disposal          Disposal


    Secondary     LPP Disposal
                                     Sand Mound
    Treatment                          Disposal



     Tertiary         Drip               Spray
                                                          Re-Use
                   Irrigation          Irrigation
    Treatment                                          (Purple Pipe)
                    Disposal            Disposal




                                                                       2
Secondary Treatment
Treatment Method Options


    Attached Growth                 Suspended Growth

• Orenco Recirculating Packed-    • Extended-Air Activated
  Bed Media Filters                 Sludge Plants
• Aqueonics Multi-Stage           • ATU’s (aerobic treatment
  Trickling Filters                 units)
• Aquapoint Bioclere/Lotus        • SBR’s (sequencing batch
  Modified Trickling Filters        reactors)
• Puraflo Peat Fiber Biofilters   • MBBR’s (moving bed
• Recirculating Sand Filters        biological reactors)

                                                               3
Tertiary Treatment
Treatment Method Options


        Effluent Polishing

• Disc Filters
• MBR’s (membrane biological
  reactors)
• Constructed Wetlands
• Disinfection

                               4
Secondary Treatment Options
Orenco AdVantex Recirculating Packed-Bed Media Filter




                                                        5
Secondary Treatment Options
Aqueonics Multi-Stage Trickling Filter




                                         6
Secondary Treatment Options
Aquapoint Bioclere Modified Trickling Filter




                                               7
Secondary Treatment Options
Puraflo Peat Fiber Biofilter




                               8
Secondary Treatment Options
Recirculating Sand Filter (RSF)




                                  9
Secondary Treatment Options
Extended-Air Activated Sludge Plant




                                      10
Secondary Treatment Options
Clearstream ATU




                              11
Secondary Treatment Options
SBR




                              12
Secondary Treatment Options
Puraflo PuraMax MBBR




                              13
  How to Select the Right System
  Decision Process Overview
              •   Define Wastewater Flow Rate and Characteristics
              •   Identify Potential On-Site & Off-Site Options
              •   Conduct Preliminary Site Reconnaissance
Feasibility   •   Perform Feasibility & Cost Evaluation of Options
of Options    •   Identify System Ownership and O&M Provider




              •   Conduct Pre-Design Conference with DHEC
              •   Conduct Detailed Site Investigation
              •   Identify & Quantify Suitable Disposal Area(s)
   Site       •   Determine Long-Term Acceptance/Loading Rate (LTAR)
Suitability   •   Obtain DHEC Concurrence with Findings




              •   Determine Feasible Disposal Method(s)
              •   Determine Required Treatment Method(s)
              •   Perform Cost Evaluation & Select System
 System       •   Submit Preliminary Engineering Report for DHEC Approval
Selection


                                                                            14
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.




                                                       15
Individual Lot Drip Irrigation
System Schematic




                                 16
Individual Lot Drip Irrigation
System 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.


                                                         17
Individual Lot Drip Irrigation
System Cost
(City of Austin, TX)
                       Estimated drip irrigation system costs, installed,
                       including controls and alarm, (not including pretreatment   $15,000
                       unit(s)),


                       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       $45/month
                       profit),


                       Equipment repair/replacement costs, estimated at
                                                                                   $4.17/month
                       $50/year,


                       20-year NPW (not including design & permitting costs),      $20,934.68




                                                                                                 18
Individual Lot Repair Solution
Camden County, NC
AdVantex Pre-Treatment & Sand Mound Disposal over Sand Line Trench




                                                                     19
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

                                                  20
Communal Drain Field
Cottageville Elem School




                           21
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
    Repair Area
   Requires Routine O&M
   Requires Utility Ownership
   Permitting by DHEC-Bureau of Water
   Approx. Unit Cost = $18,000 - $20,000 per lot
                                                     22
Ralph Chandler Middle School
Surface-Drip Irrigation System
Decision Process




                                 23
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


                                                                24
School Surface-Drip Irrigation
EQ Tank, Recirc Pumps, & Treated Effluent Storage




                                                    25
School Surface-Drip Irrigation
AdVantex Treatment Pods




                                 26
School Surface-Drip Irrigation
Irrigation Pumps & Disc Filter




                                 27
School Surface-Drip Irrigation
Surface-Drip Irrigation Field




                                 28
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 ….
                                                    29

				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:6
posted:8/17/2011
language:English
pages:29
Description: Subdivision Lot Contract document sample