Posted By: Environmental Protection Agency
Partners: U.S. Geological Survey, The Nature Conservancy, Barnstable County and Massachusetts Alternative Septic System Test Center, Massachusetts Department of Environmental Protection, New York State Department of Health (and Suffolk County NY Department of Health Services). Battelle Memorial Institute and VerifiGlobal are supporting US EPA and the Challenge under US EPA Contract #EP-C-16-014. Skill: Engineering Interest: Ecosystems Partnership With: United States Geological Survey
Submission Dates: 10 a.m. ET, Dec 18, 2017 - 11:59 p.m. ET, Jan 31, 2018
Conventional on-site wastewater treatment systems, or OWTS, (also referred to as septic systems) are not designed to remove nitrogen to the extent required for avoiding harmful algal blooms and for protecting and restoring many productive and valuable marine and coastal waters. Successfully removing nitrogen to address these concerns may require use of more advanced technology in OWTS. Regulatory officials recognize the benefit and value of solutions that remove high nitrogen levels but need more confidence in the long-term performance of I/A OWTS technologies before approving their use. Effective long term management of I/A nitrogen removal OWTS requires data that provides a real- time indication of proper functioning over the lifetime of the treatment system. A sensor which can measure the nitrogen concentration in I/A OWTS effluent coupled with real time reporting would give regulators, managers, communities and homeowners improved ability to assure systems are working properly, optimize their performance, and maintain these technologies over their lifetime, as well as provide the information needed to assess the effectiveness of restoration actions on receiving waters. Cost effective verification of system performance through use of a nitrogen sensor will protect public health and the environment, provide data to confirm and revise estimates of watershed-wide nutrient loadings, allow for more accurate models of nitrogen impact on receiving waters, and offer evidence of reasonable return on investment for homeowners and communities.
The ideal sensor would provide accurate measurement of total nitrogen in I/A OWTS effluent, effluent flowrate, include telemetry, be self-calibrating or require infrequent calibration, last 10 years, require no more than 1 maintenance visit per year and cost the homeowner less than $1,000. Such an ideal technology may not be possible. At a minimum, a sensor would provide accurate measurement of nitrate (NO-3) and ammonium (NH+4), effluent flowrate, be easily accessed and maintained (no more than four maintenance visits per year), require infrequent calibration, last 5 years and cost less than $1,500. Because Total Nitrogen is composed of organic and inorganic fractions, measuring NO-3 and NH+4 may significantly underestimate Total Nitrogen. To address this, the near-ideal sensor would measure NO-3 and NH+4, as well as Total Organic Carbon (TOC). The TOC value would be used to estimate Organic Nitrogen using an empirically-derived value of the nitrogen content of the TOC.
Phase I of the Challenge requested submissions of sensor designs having the capabilities discussed above, and awards were given at the June 29, 2017 Sensor Showcase Day.
Phase II, the Prototype Testing Program, will be managed by EPA. EPA will first seek submissions of functioning prototypes for testing and evaluation. EPA selected Battelle Memorial Institute (Battelle) to support the development of a Test/Quality Assurance Plan and Verification Protocol (T/QAP) and oversee the testing of the sensor prototypes. Phase II testing will be completed at the Massachusetts Alternative Septic System Test Center (MASSTC), a National Sanitation Foundation (NSF) certified test facility in Barnstable, Massachusetts, in 2018. Pursuant to the Agency’s authority under sections 104(a) and (b) of the Clean Water Act, 33 U.S.C. 1254(a) and (b), EPA has entered into a Memorandum of Understanding with MASSTC to memorialize this cooperative relationship. Battelle will collaborate with VerifiGlobal on the verification to ensure compliance with ISO ETV 14034.
Battelle has convened a Technical Panel to provide the technical input and expertise necessary to develop an effective verification protocol and T/QAP based on the ISO ETV Standard 14034. The Technical Panel includes experts from EPA, US Geological Survey (USGS), the Alliance for Coastal Technologies, the University of Maryland, the New England Onsite Wastewater Training Program at the University of Rhode Island (URI), the MASSTC, onsite regulators from MA and Suffolk County NY, the National Onsite Wastewater Recycling Association (NOWRA – onsite wastewater manufacturers are members of this association), the New York State Center for Clean Water Technology at Stony Brook University, and other university engineering programs.
Any technology/sensor developer is eligible to participate. Applications for sensor testing are due January 31, 2018.