Onsite Wastewater Pretreatment...
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1 Onsite Wastewater Pretreatment Technologies NDWRCDP Disclaimer This work was supported by the National Decentralized Water Resources Capacity Development Project (NDWRCDP) with funding provided by the U.S. Environmental Protection Agency through a Cooperative Agreement (EPA No. CR827881-01-0) with Washington University in St. Louis. These materials have not been reviewed by the U.S. Environmental Protection Agency. These materials have been reviewed by representatives of the NDWRCDP. The contents of these materials do not necessarily reflect the views and policies of the NDWRCDP, Washington University, or the U.S. Environmental Protection Agency, nor does the mention of trade names or commercial products constitute their endorsement or recommendation for use. CIDWT/University Disclaimer These materials are the collective effort of individuals from academic, regulatory, and private sectors of the onsite/decentralized wastewater industry. These materials have been peer-reviewed and represent the current state of knowledge/science in this field. They were developed through a series of writing and review meetings with the goal of formulating a consensus on the materials presented. These materials do not necessarily reflect the views and policies of North Carolina State University, and/or the Consortium of Institutes for Decentralized Wastewater Treatment (CIDWT). The mention of trade names or commercial products does not constitute an endorsement or recommendation for use from these individuals or entities, nor does it constitute criticism for similar ones not mentioned.
Transcript of Onsite Wastewater Pretreatment...
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Onsite Wastewater Pretreatment Technologies
NDWRCDP DisclaimerThis work was supported by the National Decentralized Water Resources Capacity Development Project (NDWRCDP) with
funding provided by the U.S. Environmental Protection Agency through a Cooperative Agreement (EPA No. CR827881-01-0) with Washington University in St. Louis. These materials have
not been reviewed by the U.S. Environmental Protection Agency. These materials have been reviewed by representatives of the NDWRCDP. The contents
of these materials do not necessarily reflect the views and policies of the NDWRCDP, Washington University, or the U.S.
Environmental Protection Agency, nor does the mention of trade names or commercial products constitute their endorsement or
recommendation for use.
CIDWT/University DisclaimerThese materials are the collective effort of individuals from
academic, regulatory, and private sectors of the onsite/decentralized wastewater industry. These materials have
been peer-reviewed and represent the current state of knowledge/science in this field. They were developed through a
series of writing and review meetings with the goal of formulating a consensus on the materials presented. These materials do not necessarily reflect the views and policies of
North Carolina State University, and/or the Consortium of Institutes for Decentralized Wastewater Treatment (CIDWT).
The mention of trade names or commercial products does not constitute an endorsement or recommendation for use from
these individuals or entities, nor does it constitute criticism for similar ones not mentioned.
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CitationLenning, D., T. Banathy, D. Gustafson, B.J.
Lesikar, S. Wecker, D. Wright. 2005. Technology Overview – PowerPoint Presentation. in (D.L. Lindbo and N.E. Deal eds.) Model Decentralized Wastewater Practitioner Curriculum. National Decentralized Water Resources Capacity Development Project. North Carolina State University, Raleigh, NC.
Pretreatment Options
To evaluate the pretreatment option for a site, the following information must be known
Hydraulic loading rate• Daily and weekly peaks
Organic loading rate• Wastewater strength• Contaminants of concern
Pretreatment OptionsWastewater Strength
Organic loading rate• BOD5
• TSS• Fats, oils, and grease• Temperature• pH• Nitrogen
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Pretreatment Options
Adsorption in soil, physical-chemical, filtration, anoxic-aerobic
Phosphorous
Nitrification-denitrification, ion-exchange
Nitrogen
Filtration, predation, inactivation, disinfection
Pathogens
Aerobic/anaerobic, sedimentation, filtration
Organic material (BOD5)
Sedimentation, filtrationSuspended solidsRemoval ProcessesParameter
Adapted from USEPA, 2002
Pretreatment Approval Process
Pretreatment Approval Process
Pretreatment systems are approved by the Innovative and Experimental (I&E) CommitteeCommittee is made up of people from both the public and private sectorRequirements for approval listed in Rule .1969
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Pretreatment Approval Process
Pretreatment can be approved as one of the three types
ExperimentalControlled DemonstrationInnovative
Main differences between the three are the number of systems that can be installed and the amount of sampling required
Levels of Pretreatment
Three levels of pretreatment in North Carolina
NSF Std 40Treatment Standard ITreatment Standard II
Levels of Pretreatment
NSF-40• CBOD < 25 mg/L• TSS < 30 mg/L
Treatment Standard I• CBOD < 15 mg/L• TSS < 15 mg/L• NH4-N < 10 mg/L• Fecal coliform <10,000 colonies/100 mL
Treatment Standard II• CBOD < 10 mg/L• TSS < 10 mg/L• NH4-N < 10 mg/L• TN < 20 mg/L or > 60%• Fecal coliform < 1,000 colonies/100 mL
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Pretreatment and Rule .1970
If a pretreatment manufacturer can meet one of the three treatment standards, special siting and sizing requirements can be applied to the siteSome of the special siting and sizing requirements include
An increase in loading rateReduced vertical separation distancesReduced horizontal separation distances
NSF Standard 40 Systems
NSF Standard 40 Systems
Systems that can meet the treatment level of NSF Standard 40
BOD < 25 mg/LTSS < 30 mg/L
Must be certified by NSF or other accredited program that the unit can meet NSF Standard 40Known as Residential Wastewater Treatment Systems (RWTS) or Aerobic Treatment Units (ATUs)
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NSF Standard 40 Systems
RWTS Manufacturers are approved by the On-Site Wastewater Branch and do not have to get approval from the I&E Committee
NSF Standard 40 Systems
NSF Standard 40 Systems A septic tank or settling tank prior to the unit is requiredMechanical aeration of the wastewater occurs to provide aerobic treatmentAerobic treatment provides a better quality effluentHigh level of operation and maintenance required
NSF Standard 40 Systems
Typical diagram of ATU
Purdue University
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NSF Standard 40 Systems
Approved NSF Standard 40 Systems (RWTS)Aquarobic InternationalBio-Microbics Inc (FAST)Clearstream Wastewater Systems, IncConsolidated Wastewater Treatment SystemsDelta Environmental Products IncHoot Aerobic Systems, IncHydro-Action IndustriesJet IncNorweco, Inc
Treatment Standard I and II Systems
Treatment Standard I and II Systems
Bioclere (Aquapoint)Trickling filter system with plastic mediaApproved for both domestic strength and high strength wasteUnits can be up to 22 feet in height and 12 feet in diameterThe smaller single family home units have not been approved for use
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NOZZLE ACCESS FROM OUTSIDE
FAN HOUSING AND ELECTRICALCONNECTIONS
SAMPLING PORT
CENTRAL ACCESS SHAFT
INSULATED FILTER
6” SCHD 40PVC OUTLET
CLARIFIER
DOSING PUMPRECIRCULATING PUMP
6” SCHD 40PVC INLET
DIAPHRAGM(MEDIA SUPPORT)
1-1/2” SCHD 40 PVCRECYCLE LINE
RANDOM PVC MEDIA
LOCKABLE ACCESS COVER
INTERNAL SCHEMATIC
BIOCLERE SECTIONAL VIEW
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BIOCLERE INTERNAL VIEW
Treatment Standard I and II Systems
EcofloCompany is Premier TechProduct is a peat filterSome installations of the peat filter do not go to a separate drainfieldApproved for TS-I only
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Treatment Standard I and II Systems
PurafloCompany is Bord na MonaProduct is a peat filterPeat filter is in a podApproved for TS-I only
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Treatment Standard I and II Systems
Sand FiltersIntermittent and recirculatingGeneric sand filter approval and proprietary (Orenco Systems, Inc and American Manufacturing)Can be either buried or open accessFor the generic sand filter, the containment structure can be either built on site or a pre-made structure
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NSFC
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Treatment Standard I and II Systems
AdvanTexCompany is Orenco Systems IncTextile filter in a fiberglass basinTextile media is in sheets in basinApproved for TS-I and TS-II
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Treatment Standard I and II Systems
FASTCompany is Bio-Microbics, IncFixed activated sludge treatment processCombination of both suspended and attached growth processesMedia in tank that bacteria can grow onApproved for TS-I and TS-II
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Treatment Standard I and II Systems
SeptiTechFixed film trickling filter using a polystrene mediaPolystrene media is held together with netting in the tankApproved for TS-I and TS-II
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Treatment Standard I and II Systems
EarthtekCompany is Wastewater Innovations, IncAttached growth packed bed filterTextile chip mediaApproved for TS-I
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Treatment Standard I and II Systems
E-Z TreatCompany is E-Z Set CompanyProduct is a filter using a polystrene bead mediaApproved for TS-I and TS-II
