Transcript Soluble Nonreactive Phosphorus Spikes at Metropolitan Wastewater

Jennifer Soltys
MCES IWPP Engineer Intern
http://photography.nationalgeographic.com/photography/photo-ofthe-day/algae-bloom-lake-erie-essick/
Total Phosphorus
=
Soluble
Nonreactive
Phosphorus
(sNRP)
Soluble Total
Phosphorus (sTP)
+
Total Particulate
(Solids)
Phosphorus
Soluble Reactive
Phosphorus (sRP)


Nonreactive . . . BUT
sNRP ~46% of effluent TP
MPCA proposed TP limit of 0.28 mg/L
Days of TP > 0.28 mg/L in Metropolitan
WWTP's Effluent
80
67
60
40
Days

61
37
20
0
2012
2013
2014 (as of August 31,
2014)
Years

Plant Averages
◦ sNRP ~ 580 lb/day
◦ sTP ~ 3000 lb/day

Plant Spikes
◦ sNRP ~ 2000 lb/day
◦ sTP ~ 5000 lb/day
2000 lb
http://www.fanpop.com/clubs/volkswagen-beetle/images/36942262/title/herbielove-bug-photo

Data analysis
◦ Identify industrial uses
◦ Identify trends

Find the sNRP source
◦ Reduce or eliminate

Primary Uses
◦ Flame retardants
◦ Antifoaming agents
◦ Plasticizers

Additional Uses
Solvents
Mechanical/aircraft
Lab R&D
Agricultural
Construction
Pharmaceutical/
personal care
◦ Food/animal industry
◦ Mining
◦ Printing
◦
◦
◦
◦
◦
◦
Metropolitan WWTP's Daily Influent sNRP Spikes
3%
9%
17%
Monday
Tuesday
17%
20%
Wednesday
Thursday
Friday
14%
20%
Saturday
Sunday

Spike ~2000lb/day batch discharges
Potential Water Volumes Corresponding to
Phosphorus Loadings
Flow
(gallons per
day)
Phosphorus
Concentration
(mg/L)
Loading
(lb)
1,000,000
264
2203
500,000
528
2203
100,000
2,640
2203
10,000
26,400
2203
Investigated Industrial Use
Initial Sites:
Metropolitan Influent, L65. M003, M701
Sample Testing:
R&D  ES Lab
Secondary Sites:
Metropolitan Influent, L65
M003, MH TB 2
Sample Testing:
ES Lab
MH TB 3

61 sNRP Influent Spikes (as of August 31)

12 sNRP Spikes since June 1


Removed Eastern Metro (Site M003) as an
option
Narrowed scope to flows in or into St. Paul
and Minneapolis (Site MH TB 3)

Continue the phosphorus investigation
◦ Investigate suspect uses
◦ Continue sampling industries
◦ Track sNRP
 Monitor
 Metro Plant’s influent and effluent streams
 Sampling points upstream