comparing nitrogen removal of various onsite treatment systems
DESCRIPTION
How does the treatment of effluent by a septic tank and infiltration system compare to other systems? How much do the other systems cost? Other systems include: septic tank for washwater and dry toilet for excrement, septic tank with urine diversion, and septic tank with sand and wood chip filter.TRANSCRIPT
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recode Effluent Plumes from 4 Different Onsite SystemsComparing Nitrogen Removal
Oregon, Residential Strength Wastewater
Sweden: High Risk Areas 2006, NSF/ANSI 245: Nitrogen Reducing Systems 2007, Oregon: Alternative Technology Treatment Standard 22007, Deschutes County: Existing Development 2008, Maryland: Chesapeake Bay Critical Areas 2012
While implementation varies from setting adischarge concentration of 30mg/L (Maryland), tosetting a % reduction standard (Deschutes,NSF/ANSI), to setting total yearly discharge capand % reduction standard equivalent to 30mg/L(Sweden), this is the most common discharge limit.Finland 2004
Washington: Treatment Category 1, Level A 2007Deschutes County: Future Development 2008
Recent concerns over nitrates in groundwater and surface waters have driven tighter regulations on nitrogen discharge. All the standards listed below have been implement-ed since 2004. Performance standards in Finland and Sweden allow interventsions at the toilet or after the septic tank. Prescriptive codes in the US limit systems to nitrogen reduction after the septic stage.
18%
Dry Toilet with Septic for
Washwater
100%
20%
Septic with Urine Diversion
Septic System E�uent
16%
Septic with Sand Filter & Wood Chip
Filter
$7,000
$1,200-6,000$25,000
retrofit: $3,000 to 6,000
available at www.recodeoregon.org/resourcesinfographic by Molly Danielsson
property boundaries
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recode Effluent Plumes from 4 Different Onsite SystemsCitations
USEPA 2002: “Onsite Treatment Systems Manual” EPA/625/R-00/008Pie Charts, sources of nutrients Figure 3-7Infiltration based on 10-40% removal N, 85-95% removal of P, 90-98% removal BOD5, Figure 3-17Septic Effluent, Figure 3-19
Septic Tank with Dry Composting Toilet82.1% of total Nitrogen is from toilet: USEPA 2002. 17.9% x 24 to 90 = 4.3 to 16.11 mg/L N
Septic Tank with Sand and Wood Chip Filter10 mg/L of N: Oakley, Stewart, Arthur Gold, Autumn J Oczkowski. Nitrogen control through decentralized wastewater treatment: Process perfomance and alternativemanagement strategies. Ecological Engineering. 36(11):1520-1531. November 2010. p 1
Septic Tank with Urine Diversion“80% of N and 50% of P from domestic wastewater at treatment plants is contained in urine.” Larsen, T.A., Gujer, W., 1996. Separate management of anthropogenic nutrientsolutions (human urine). Water Science and Technology 34 (3–4), 87–94.
Sand Filter and Wood Chip Filter based on Nitrex TM System. Lombardo, Pio. Phone Interview. May 2, 2012.
Dry Toilet based off of VeraMiljoe’s Carousel dry toilet. www.vera.no
Urine Diversion retrofit based off Swedish prices as of 2006 excluding 25% tax. Avloppsguiden.se