MS4 Practices Assessment Phase III (with review of previous Phase II) Maintenance Matters ! PRELIMINARY DRAFT RESULTS Florida Department of Environmental Protection and Florida Stormwater Association and University of Florida Engineering School of Sustainable Infrastructure and Environment (ESSIE) John Sansalone ([email protected])
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MS4 Practices Assessment Phase III (with review of previous Phase II)
Maintenance Matters !
PRELIMINARY DRAFT RESULTS
Florida Department of Environmental Protection and Florida Stormwater Association
andUniversity of Florida
Engineering School of Sustainable Infrastructure and Environment (ESSIE)
Overall Project Objectives and OutcomesPrimary objective is a Florida-based “yardstick” or metrics to allow an MS4 to more robustly quantify N, P loads (and generate load credits) through separation and recovery of particulate matter (PM) for typical urban infrastructure systems inside and outside wastewater reuse areas:1. Pavement systems cleaning (pavement street sweeping), 2. Catch basins (inlets), 3. “BMP “ (the most utilized and cleaned BMPs for an MS4)
• Outcomes are Florida-based metrics (a statistic of the resulting probability distributions: i.e. median) based on 12 MS4s
• Outcomes allow dry-equiv. load of PM separated (i.e. a BMP) and then recovered by maintenance to be converted to N, P loads
• Outcomes quantified by land use or independent of land use• Outcomes quantified for areas w/wastewater reuse and without (control)
Specific Project Objectives with Tasks and Outcomes
1. The reclaimed water enrichment (N, P) of PM recovered from maintenance operations of hydrologic functional units (HFUs):
Tasks and Outcomes:1. PM sampling by MS4s for paired locations, inside/outside reclaimed water areas,
2. Sampling by MS4s of AWT, WWTP effluent paired w/reclaimed water area samples,
3. Sampled land uses: residential, commercial, highway - consistent w/Phase II study,
5. Samples outside of reclaimed water areas serve as the control samples,
6. Nutrient analysis of recovered PM and final effluent will include TP and TN,
7. Florida-, HFU-, land use-based distributions/summary metrics for reclaimed water areas as compared to control (outside reclaimed water areas).
Specific Project Objectives with Tasks and Outcomes
2. Nutrient enrichment of specific particulate matter (PM) size fractions:
Tasks and Outcomes:
1. PM samples will be size-fractionated into:
a. > 2 mm (debris, gravel-size PM, detritus, biogenic materials such as leaf litter),
b. 0.075 mm (#200 sieve) to 2 mm, for the coarse fraction of PM,
c. < 0.075 mm, for the fine fraction of PM, when sufficient PM is available
2. Nutrient analysis will be conducted on each of these size fraction,
3. Test if PM size fractions enriched by TP, TN compared to outside reclaimed water areas,
4. Water content and volatile fraction analysis conducted on each size fractions,
5. Analyze particle size distributions (PSD) to identify relative mass of these size fractions,
6. Florida-, HFU- and land use-based distributions and summary metrics for all areas,
Specific Project Objectives with Tasks and Outcomes
3. The leaching of PM by “stormwater” (urban drainage):
Tasks and Outcomes:
1. Nutrient leaching/sorption endpoints for inside/outside reclaimed water areas in only GNV, UF will have to work with GNV on the appropriate and additional sampling,
2. TP/TN leaching or sorption rates of PM for aerobic conditions in wet sumps,
3. TP/TN leaching or sorption rates of PM for anoxic/anaerobic conditions in wet sumps,
4. Leaching/sorption rates of PM for moist conditions of “dry” BMP or CB sumps; or SS,
5. The outcome from this objective is to assess a maintenance interval so that TP/TN can be retained and recovered with PM as opposed to being leached into urban drainage.
Specific Project Objectives with Tasks and Outcomes
4. A PM water content nomograph (quantify water associated with PM)
Tasks and Outcomes:
1. Produce a probability distribution and metric for water content as a function of HFUs and land use,
2. Produce a water content metric for the 3 PM size fractions and biogenic materials such as leaf litter,
3. Create water content nomograph (a tabular or graphical plot) for PM of SS at recovery based on available MS4 weather data,
Specific Project Objectives with Tasks and Outcomes
5. A 2nd generation FSA interactive spreadsheet tool for MS4 load credits:
Tasks and Outcomes:
1. Create and test a 2nd generation synthesis spreadsheet with input from MS4s, FDEP, FSA,
2. Provide two interactive educational seminars at summer FSA conferences,
3. The outcome is a public tool (spreadsheet) and seminar-based guidance for Florida MS4s to quantify PM, N, P, load recovery and credits.
Phase III (and II) focuses on PM-phase N and P loads(PM-phase N and P control directly impacts aqueous phase N and P)
Particle Diameter, D (m)
{cdf
}: %
fine
r by
mas
s, F(
D)
0
20
40
60
80
100
Dry Depositionq (up)
q (down)
downstreamupstream
q (settled)
110100100010000
)(/)(
/1
DeDDf
)(/)()( DDF
0
)(1)( dxex x
D x
D dxex0
)(1)(
PSD gamma model
PSD of
PM
DDPavementDeposition
q (up)CB or inlet
Runoff
q (down)BMP influent
Runoff
q (settled)BMP effluent
RunoffD50m 331 μm 99 μm 23 μm 14 μm
PM: Particulate
Matter
BMP: Clarifier with 1 hr. of quiescent settlingLocation (γ, β) DD (2.06, 187.7)
q (up) (1.90, 61.9)
q (down) (1.23, 23.6)
q (settled) (1.51, 11.1)
Review of Phase III Methodology
1. For physical sampling and analytical laboratory analyses the methodology is the same as Phase II
2. For Phase III the samples received to date (14 June 2018) and the categorical distribution of samples is shown in the following slides
3. The total number of samples in any one category is smaller than Phase II given that Phase II only focused on outside of reclaimed areas where one objective of Phase III is to directly compare samples from reclaimed areas (IN) to samples from outside of reclaimed areas (OUT)
Code Full name Population Land area
APF Naples 21,845 42.59 km2
BC Brevard County 589,162 4,033 km2
EC EscambiaCounty 315,187 2,266 km2
GNV Gainesville 124,354 164.43 km2
LC Lee County 739,224 3,139 km2
MCO Orlando 277,173 294.61 km2
OC Orange County 1,348,975 2,598 km2
PIE St. Petersburg 260,999 356.50 km2
SAC Sarasota County 51,917 65.31 km2
SEC Seminole County 449,144 894 km2
ST Stuart 16,623 23.31 km2
VC Volusia County 517,887 3,710 km2
Phase III Participating MS4s
Total project PM samples (n = 406/505)
IN(n = 205/256)
BMP (n = 77/92)
CB (n = 67/82)
SS (n = 61/82)
OUT(n = 201/249)
BMP (n = 68/82)
CB (n = 71/85)
SS (n = 62/82)
Total project PM samples (n = 406/505)
IN(n = 205/256)
R (n = 78/92)
H (n = 58/81)
C (n = 69/83)
OUT(n = 201/249)
R(n = 67/83)
H (n = 63/81)
C (n = 71/85)
Sample delivery (as samples analyzeda/target # of samples)
a. APF (12) and PIE (24) samples are currently under analysis.b. Duplicates not tabulated in these numbers
HFUbasis
Land Usebasis
MS4 Samples No. of samples still required Notes (Labels of missing samples)
MS4 sample deliverables that remain as of 14 June 2018
Review of Preliminary Primary Phase III Results
1. Results presented are from outside (OUT) reclaimed wastewater areas and inside (IN) reclaimed area results; this is different from Phase II that only suggested such a comparison
2. Results are either composited by combining separate land use results or combining separate HFU (SS, CB, BMP) results or both; OR results are delineated as a function of land use and HFU. For brevity only summary results are illustrated.
FL database for BMPsc 1,900 10,500 41a. For BMPs, separation and recovery are required, while only recovery is required for maintenance practices.b. Based on 100 dry pounds of PM recovery based on an annual cleaning frequencyc. TMDL database for Florida Best Management Practices, 2009
Economics of PM recovery method (SS vs equivalent BMPs for load) and associated nutrients from Orange County
Note: SS reported as mass (tons)
Economics of PM recovery method (SS vs equivalent BMPs for load) and nutrients based on entire FDEP database for reporting MS4s
Impact of maintenance interval on PM removal efficiency(Results validated with actual events of return periods at ~ 1 month)
Treatment Train:• Primary (Type I)
settling followed by secondary filtration
Clarification Basin:• Primary (Type I)
settingScreened HS:• Primary (Type I)
setting and size exclusion by screen
Screened HS function governed by cleaning interval, whereas treatment train can be governed by head loss
Storm-driven Computational Fluid Dynamics for BMP Behavior
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1. Consistent with Phase II, Phase III results to date recommends continued use of a median (50th percentile) concentration [mg or g/kg] from each measured TN and TP distribution,
2. This result is important for allocation of load credits because the results are not represented by a singular concentration [mg or g/kg] but by distributions of concentration,
3. Results to date from Phase III indicate that reclaimed wastewater does not enrich urban PM and detritus with TN (similar to Phase II) and TP (different from Phase II) noting that Phase II only compared three MS4s for inside vs. outside at reclaimed wastewater areas,
4. Economy of load recovery by street sweeping is significantly lower than separation/recovery by BMPs (manufactured and non-proprietary) which are still needed, even assuming such BMPs are maintained annually and do not scour/washout. (See previous $/pound slide),
5. Economics not withstanding, volumetric/hydrologic control systems and BMPs are still required but require regular maintenance, optimization, retrofitting through existing tools such as computational fluid dynamics (CFD) and continuous simulation modeling (SWMM)
6. MS4s can benefit from efforts focused on street sweeping for load recovery and source control while optimizing/retrofitting/maintaining volumetric/hydrologic control and BMPs