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A Story of Regulatory Success
How the Town of Cary and Winston-Salem/Forsyth County Partnered with NC DEQ/DWR and EPA to Improve Analytical Standards for Thermally Dried Biosolids
NC AW W A/ W EA Conference 20 17Presented by: Kelly Spainhour – Tow n of Cary, South Cary W RF
Chris Shamel - W inston-Salem/ Forsyth County Ut ilit ies
Legacy Biosolids Opt ions
Digester
Biological Treatment
Landfill Land Application
Drying Bed
Composting
Fuel
W hy Biosolids Drying?
Alternatives such as land application can be challenging in urban and suburban areas. Thermal Drying reduces biosolidsvolume.Class A, Exceptional Quality Product.Applied virtually free of site and use
restrictions.
W inston-Salem – Archie Elledge W W TP(Permit ted at 30 -MGD – Convent ional Treatment )
W inston-Salem – Muddy Creek W W TP(Permit ted at 21-MGD Convent ional Treatment )
W inston-Salem – Dew atering & Drying Facilit y
Andrit z Rotary Drum Dryer
Dryer System Process Schemat ic
Dryer Build ing and Storage Facilit y
South Cary W RF – 1 Dryer Serves 2 Plants
North Cary W RF – Overview(Permit ted at 12.0 -MGD Advanced BNR Treatment , ADF of 7-MGD)
South Cary W RF – Overview(Permit ted at 12.8-MGD Advanced BNR Treatment , ADF of 5.5-MGD)
South Cary W RF Biosolids Dryer(Andrit z DDS-40 , Rated at 5,742 Dry Tons/ Year)
South Cary WRF’s AndritzRotary Drum Dryer has been in operation since 2006Centrifuge dewatering Centrifuge/Dryer also receives solids
from North Cary WRFProcesses 3,500 dry tons/yearPelletized productClass A, Exceptional QualityNutrient content of 5-4-0 in Enviro Gems
with 1.5% iron.
South Cary W RF – Andrit z Rotary Drum Dryer
W estern W ake Reg ional W ater Reclam. Fac.(Permit ted at 18-MGD Advanced BNR Treatment , ADF of 5-MGD)
W estern W ake RW RF – Belt Dryer Overview
W estern W ake RW RF – Kruger Belt Dryer(Pellet izing added for improved f inal p roduct qualit y)
Kruger Belt Dryers 2 Train
ConfigurationRated at 5,135
Dry Tons/YearEnd Product is
Dry StrandsPelletizing
improves bulk density
Dry Biosolids Benef icial Reuse
Pelletized heat dried biosolids are marketed through Soil Plus for beneficial reuse.Potential uses are as fertilizer and organic
soil conditioner for agricultural and forestry applications.
Compliance Challenge w it h Analyt ical Methods for Dry Biosolids
EPA 50 3 Regulat ions
EPA’s 503 Regs.– National policy on biosolidsand sewer
sludge disposal.– Adopted in 1993.
Focus on Traditional BiosolidsDisposal
Heat Drying Options are Relatively New– Class A, Exceptional Quality Product– Virtually free of site and use restrictions– Applied freely as organic soil amendment
or fertilizer
Heat Dry Biosolids Are A Stab le Product
What is the Problem?–Compliance Monitoring –Outdated Regulations–Sample Preservation and Hold Time
Requirements
A Federal regulatory compliance challenge
W hat is t he Compliance Challenge?
Four Critical Elements of ComplianceAcid Preservation Total Solids Analysis pH Analysis Fecal Coliform
Biosolids Terminology
Non-Aqueous? Not the best terminology. Liquid: ability to flow naturallySemi-solid: pliable without ability to flow
naturallySolid: non-pliable
Biosolids Analyt ical Prep Methods
Non- existent preparatory methods for nutrient analyses.Data qualifiers on monitoring reports. Legal defensibility of data.Outdated regulations prevent full
compliance with CWA program requirements in 40 CFR Part 136.
Partnership Model t o Solve t he Compliance Challenge
New Approach: Forg ing a Partnership
Cary and Winston-Salem/Forsyth CountyNC Dept. of Environmental QualityEPA
Develop ing our Compliance St rategy
Meeting on June 22, 2016.Discuss a Common Point of ViewMeeting Conclusion: a Federal regulatory
problemApproach EPA to find a solution
Kelly and Chris Go to W ashington
Participants: Cary, Winston-Salem/Forsyth County, NC DEQ/DWR Lab Certification, Non-Discharge Permitting, and Regional Offices.Meeting conclusion –outdated regulations
prevent full ability to comply with CWA requirements for biosolids analyses.EPA eager to assist in helping us to achieve
our compliance goals.
Recommendat ions – A Path Forw ard
Formal Regulatory updates may take years to executeEPA ATP Process is a better option
How to Navigate ATP Process Approval
EPA ATP for Limited Use - 40CFR Part 136.5Apply through NC DEQ/DWR Lab
Certification SupervisorSubmitted to EPA by NC DEQ/DWR Lab
Certification Program SupervisorATP for Limited Use is for Regional or
NPDES Permit specific approval
Current Status
Kelly Spainhour (Town of Cary) and Dana Satterwhite (NC DEQ) working together to compose new Methods for non-existent nutrient analysesNew Method Development and Validation
Utilizing EPA 821-B-16-001 Under EPA’s Alternative Test Procedure ProgramNo acid preservation 24 hold time at ambient for coliform
and pH analysis 7 day hold time at ambient for TS analysis
How do w e Def ine Success?
Partnership approach
Working together – regulated and regulatory to accomplish compliance goals
Path toward National Approval
Quest ions?
For more informat ion, contact :Kelly Spainhour, South Cary W RF Lab Supervisor
919.779.0 697, [email protected]
Chris Shamel, W inston-Salem/ Forsyth County336.397.7678, chrisss@cit yofws.com
Dana Sat terwhite, NC Dept . of Environmental Qualit y919.733.390 8, dana.sat [email protected]