small community sewage solutions
TRANSCRIPT
NNECAPA Conference, Woodstock, Vermont September 2008
Small Community SewageSolutions
Mary K. Clark,Director of Market Development,
Eastern U.S.
Premier Tech Environment
• What are centralized/decentralized systems?• What are potential impacts from decentralized?• How do regulations affect choices of systems?• Where are we going with wastewater management decisions?• How can we overcome current barriers?
►OUTLINE
►What are Decentralized Systems?
►Traditional Onsite Treatment System
►Advanced Onsite Treatment
TECHNOLOGY Ecoflo® Biofilter Chosen by more than 35,000 families in
North America and Europe
Areas with soil and site constraints Limited available space Allows soil to do final treatment without clogging Can allow for reduced vertical separations to water table & clay Can allow for reduced sized drainfield (double loading rate) Failed system repair or renovation Nutrient reduction in environmentally sensitive areas
►Why Use Advanced Treatment?
► Products Approval can be based on results from NSF Bench tests or fieldverification tests
115 115 n TSS / n CF948236,400F.C. / 100 mL*2 ±138 ±BOD5 (mg/L)2 ±
Effluent
170 ±TSS (mg/L)
InfluentParameters
* Geometric mean
► Treatment efficiency obtained in thefield*
234,262F.C. / 100 mL*
0.12 ± 0.045.9 ± 0.9Total Phosphorus(mg/L)
8 ± 9**
Effluent at 12 inches ofsoil after Ecoflo
45 ± 24Total Nitrogen(mg/L)
InfluentParameters
•Mean efficiency (+/- std deviation)
•**Groundwater = 4+/- 4
►LANDSCAPING EXAMPLES
►TYPICAL LAYOUT – COMMUNITY SIZE
STEP, STEG or Septic tank
Domestic wastewater
Effluent criteria:CBOD5 and TSS : 10
mg/L
Equalization tank
Settling tank
EcoflexTM
Textile Filter
BioSegTM trickling filters, 1 or 2 tower(s) in 1 stage
(parallel)
►GENERAL DESCRIPTIONEcoflexTM packed-bed Textile Filter
Applications:• Domestic wastewater or wastewater with similar characteristics
(example: office building)• Optimal flow range : 1 to 30 homes, i.e. 500 to 8,000 gpd• Community, commercial or residential applications
►GENERAL DESCRIPTIONEcoflexTM packed-bed Textile Filter
► COMMUNITY APPLICATIONSMunicipality of St-Joseph de Kamouraska
Quebec, Canada
► COMMUNITY APPLICATIONSMunicipality of St-Joseph de Kamouraska
Quebec, Canada
► COMMERCIAL APPLICATIONS
Chics-Chocs Hotel, Quebec, Canada
PeatLand Community System
Distribution pipe network
Grass or other vegetation Local wetland
plant speciesNatural insulating
blanket
River, stream or ditch
Treated effluent
Selected granular media
Sampling basin
Collecting pipe
Peat covering
Septictank
effluent
Aggregate layer(usually sand)
Peat Filter(Peat Moss and Selected Media)
Subsurface Constructed Wetland
Adds water back in to the groundwater aquifersDisperses back into the environment in small scattered patterns – no widespread failures can occur
Water Supply Protection – Individual and community wells
►WATER QUALITY IMPACTS
Nitrogen a concern in coastal watersPathogens cause swimming & shell fishery closuresPhosphorus is emerging as a water quality concern in many freshwater systems
►WATER QUALITY IMPACTS
The blue algae problem is growing fast in many locations
►WATER QUALITY IMPACTS
0
50
100
150
200
250
300
2004 2005 2006 2007
Num
ber o
f lak
es o
r rive
rs af
fect
ed
Lakes and rivers
Provinceof
Quebec
• Each state, county, municipality has regulations• Different requirements for size of systems (flows)• Trying to fit small-scale systems/projects into centralized sewer model – priority rankings, funding
►REGULATIONS AND FUNDING
Utility structures – dealing with current old sewersDesign/build/own/operateLocal/regional management districtsWatershed management
►WASTEWATER MANAGEMENT DECISIONS
• Consultants and town administration• Regulators, regulations & financing• Innovation/forward thinking approaches• Green Community Technologies
►MOVING FORWARD
